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-Ic NO. 369-A-8020 0. ... MODEL REPORT NO. PAGE ... 3B. Front View - Support Tare Configuration 41...

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bircuuty Classification

DOCUMENT CONTROL DATA. R & D"(Security classification of tItle, body of abstre ct end Indexing ainotation must be entered when the overall report to cleamilltsd

I. ORIGINATING ACTIVITY (Corporate author) a&, REPORT SEGURITY Cl-AISJFICATION;

Hughes Tool Co.-Aircraft Division UnclassifiedCulver City, California 2b. GROUP

S. REPORT TITLE

Aerodynamic Tests of an Operational OH-6A Helicopter in the Ames 40 ft X 80 ftWind Tunnel

4. OESCRIPTIVE NOT aS (Type ao report and Inclusive date@)

Final Report (June 1966 thru May 1970). . S. AU THORI S l (Flret name, m iddle initial, last nam e)

LaForge, S. V.Rohtert, R. E.

0. ;CPO'TDTE7-, M PO T DATy 9 74, TOTAL NO. OF PAGES 7b. NO. OF REFPMay 1970

e. CON TRACT OR GRANT NO. ia. ORIGINATOR *S REPORT NUMSER(I)

N~w66- 065 7- fV b. PROJECT NO. 369-A-8020

0. h.9b , OTHER REPORT NO(s) (Any other numbers that may be assignedthia report)

"d.10, DISTRIBUTION STATEMENT

it API-PIQVID FOR PUBLIO REIJ.AS3DISTRIBUJTIO UNLIMITE

It. SUPPL rEMENTARY NOTES 1i , SPONSORING MILITARY ACTIVITY

*.IANaval Air Systems Conmand

\This report precents a comparative evaluation of the aerodynamic characteristicsof an operational OH-6A helicopter as obtained from wind tunnel tests performedin the NASA-Ames 40X80 foot wind tunnel, flight tests, and digital computer st'udies.The objectives were: 1) Explore helicopter and rotor component stability deriva-tives and performance. 2) Simulate use of increased solidity by conducting aportion of the wind tunnel tests at values of thrust corresponding to v alves of0CT/V approximately one-half flight values. 3) Conduct analytical studiesinvolving use of digital computing techniques, 4) Measurement of rotor blade androtor mast moments.

DISTRIBUTION OF THIS DOCUMENT•'

•; l

"IS

UN LIM ITE D

DDUnclassifiedSerurity Classification

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:, •, • •..•., ,_,: .=, ••-,. ,=, ......... ••.,.., . ,.,

. .. . . . . . . . . .-. t-,..

REPRODUCTION QUALITY NOTICE

This document is the best quality available. The copy furnishedto DTIC contained pages that may have the following qualityproblems:

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security Classification m

Operational OH-6A helicopter.'

SeCUrity CISM~lification

b

1/

1J

HTC-AD Report No. 369-A-8020

AERODYNAMIC TESTS OF AN OPERATIONALOH-6A HELICOPTER IN THE AMES 40' x 80'

WIND TUNNEL

May 1970

Prepared Under Contract NOw66-0657-f

for

NAVAL AIR SYSTEMS COMMANDDEPARTMENT OF THE NAVY

This report has been reviewed by the Naval Air SystemsCommand. The findings in the report are those of thecontractor and not those of the Naval Air Systems Commandor the Department of the Navy.

APPR1VF.D FOR PUBLIC RZI4"t <~ IA 1 '

D1STRIBUTI5 UNILIMIM~-

DISTRIBUTION OF THIS DOCUMENT IS UNLIMITED

HUG S Tom COMPANY-AIRcRAFT DIVISION 369-A-8020MODEL REPORT NO. PAGEANALYSIS 9

PREPARED DY JLR E htr Aerodynamic Tests of an Operational OH-6A

3 CMECKEOvy S. V. LaForge Helicopter in the Amex 40' x 80' Wind Tunnel

TABLE OF CONTENTS

1. 0 SUMMARY 1

*1 2.0 CONCLUSIONS 2

"3.0 INTRODUCTION 4

4.0 NOMENCLATURE 6

4.1 Notation (Analytical) 64.2 Notation (Configuration) 7

5.0 DESCRIPTION OF TEST CONFIGURATION 9

5.1 Installation on Ames Supports 9"5.2 Tail Boom Support 105.3 Support Interference Configuration 125.4 Helicopter Control Console 135.5 Instrumentation 15

6.0 CALIBRATION AND DATA REDUCTION 17

6.1 Balance Calibration 176.2 Balance Data 176.3 Tail Boom Support Balance 186.4 Strain Gage Instrumentation 186.5 Position Calibration 19

7.0 TEST PROGRAM 20

7.1 Test Procedure 207.2 Test Variables 207.3 Test Log 21

8.0 DATA ANALYSIS 22

8.1 Method of Computing Theoretical Stability 22Data

8.2 Suitary of Measured and Theoretical 24Stability Derivatives

8.3 Rotor Flapping 278.4 Rotor Pitching Moment Derivatives 288.5 Thrust Derivative 288.6 Stabilizer Effectiveness with Angle of 29

Attack8.7 Roll Derivative with Angle of Attack 29

HuGHEs ToOm COMPANY-AIRCRAFT DIVISION 369-A-8020 -

ANALYSIS MODEL REPORT NO. PAGE

OREPARED BY R. Z. Rohtert Aerodynamic Tests of an Operational OH-6.A :cucEcKo my S. V. jaForge Helicopter in the Ames 401 x 80' Wind Tunnel

TABLE OF CONTENTS (continued)

8.8 Longitudinal Stick Motion Derivatives 308.9 Lateral Stick Motion Derivatives 318.10 Collective Stick Motion Derivatives 318.11 Speed Stability 328.12 Level Flight Performance 32A8.13 Loads Comparisms 32B8.14 Collective Control System Flexibility 338.15 Fuselage Characteristics 35

9.0 u1m gIS 36

TABLES

TABLE I - List of Oscillograph Recorded Data 38Channels

FIGURES

1. OH-6A Wind Tunnel Installation-Right Rear View 392. OI-6A Wind Tunnel Installation-Right Front View 403A. Side View - Test Configuration 413B. Front View - Support Tare Configuration 413C. Front View - Test Configuration 413D.. Three View Drawing 41A4. Schewtic, Side Vie' 425. Longitudinal Flapping, ale, Vs. Rotor Shaft 43

Angle of Attack,Osa6. Derivative of Longitudinal Pitch Vs. Rotor Shaft 44

Angle of Attack for Zero Flapping Vs. Advance Ratio7. Pitching Moment Coefficient Va. Rotor Shaft 45

Angle of Attack8. Derivative of Rotor Pitching Moment Vs. Rotor 46

Shaft Angle of Attack Vs. Advance Ratio9. Rotor Thrust Coefficient Vs. Rotor Shaft Angle 47

of Attack10. Derivative of Thrust Coefficient Vs. Rotor 48

Shaft Angle of Attack Vs. Advance Ratio11. Helicopter Pitching Momenit Vs. Rotor Shaft 49

Angle of Attack12. Derivative of Pitching Mome,.t Vs. Rotor Shaft 50

Angle of Attack Vs. Advance Ratio13. Roll Moment Coefficient Vs. Rotor Shaft Angle 51

of Attack14. Derivative of Rotor Roll Momsnt Coefficient Vs. 52Rotor Shaft Angle of Attack Vs. Advance Ratio

Transferred to C.G.

9 , 7 IW,

HUGHES TOOL COMPANY-AIRCRAFT DIVISION369-A-8a2oMODL _IEPoIT NO. PAGE

ANALYSI R. E. Rohtert Aer'dynamic Tests of an Operational OH-6AY .v. Laiorge Helicopter in the Ames 40' x 80' Wind TunnelSCHLZKKD 0 E

i ~ LIST OF FIGURES (continued)-

15. Longitudinal Flapping Vs. Long. Cyclic Motion 5316. Derivative of Long. Cyclic Flapping Va. Long. 54

Cyclic Motion Vs. Advance Ratio17. Derivative of Rotor Pitching Moment Vs, Long. 55

Cyclic Stick Vs. Advance Ratio Transferged to C.G.18. Helicopter Pitching Moment Vs. Long. Cyclic Notion 5619. Derivative of Helicopter Pitching Moment Coeffi- 57

cient Vs. Long. Cyclic Motion Vs. Advance Ratio20. Derivative of Thrust Vs. Long. Cyclic Motion 58

Vs. Advance Ratio21. Lateral Blade Flapping Vs. Lateral Cyclic Motion 5922. Roll Moment Vs. Lateral Cyclic Motion 6023. Derivative of Roll Moment Vs. Lateral Cyclic 61

Motion Va. Advance Ratio24. Long. Flapping Vs. Collective Pitch 6225. Lateral Flapping vs. Collective Pitch 6326. Pitching Moment Coefficient Vs. Advance Ratio 6427. Thrust Coefficient Vs. Advance Ratio 6528. Comparison of Level Flight Performance 6629. Comparison of Flight Teat and Wind Tunnel Loads 6730. Comparison of Flight Test and Wind Tunnel Loads 6831. Pitch Link Average Load Vs. Collective 6932. Console Collective Vs. Oscillograph Collective 7033. Fuselage Aerodynamic Characteristics 7134. Fuselage & Tail Aerodynamic Characteristics 7235. Time Histories of Rotor Loads 73

APPENDIX A

Tabulated Data A-1

APPENDIX B

Physical Description of Main Rotor and Controls B-1

APPENDIX C

Rotor Performance Sub-routine C-1

Rev. 7/15/71

HuGHM TOoM COMPANY-AIRCRAFT DIVISON~

PE ARE MY n tIn tet Igo Ia veil"e On an oe tOpeaioa O-

CHCE BY otp cE-6Aete heione tin the NA0A 180 Wind To 80'1

Helicopter and rotar coopoeat langitWUdil stability derivatives

ven detenimned fro the ezpez'lentai ataL and acmpared with

theetoal vslnes obtained from a digital oumputer prog'me,

Wbich inMrically oaLoAUJtes the aerodynamic abereeteriftiaS

of a lifting rotr,iusixag a strip analysis techniqua. thedry

siaspaes quite- well with most of the experimentally determined,

stabilityr derivatives. Specific exceptions awe discussed lit the

body of this report.

BelicaPter performance data eammured in the wind tunm1 ohmi

good ageuaent with flight data.

Ii In addition to the wind-tumel balance data,, blade and other

S ~helicopter Oc~on ents were strainl gaged for bending aomt data

~ 1Lad for control positions. Tests were conducted ove a oAA

ranig froe .25 to .140, plus limited data at,,* .144. thes

loads data shov good agreement with flight data.

these wind tunnel tests aind analyses were condi tod under contract

Now 66-0657-f .

HUGHES ToO COMPANY-AIRCRAFT DIVISION 369-A-8020ANALYSIS MODEL REPORT NO. PAGr 2

A erodyn•mc Teasts •f an operationl O- ----PREPARED DY_. E. ohert u Helicopter in the Ames 40' x 80' Wind Tunnel

' CHECKED BY S. V. LaFor2e

e l2.0 CONCLUSIONS

The results of the experimental and analytical investigations conducted

in this program indicate that numerical techniques can be used to predict

rotor stability derivatives. The agreement between computations and test

was excellent throughout the speed range investigated (/- .25 to .35).

It is felt that a simple computer program assuming uniform induced velocity

can successfully be used to obtain rotor derivatives at the advance ratios

tested.

The numerical technique was not programmed to predict the large increase

in blade flapping due to retreating tip stall. Though a program which

includes blade torsion as a degree of freedom and properly simulates the

shift in airfoil center of pressure with blade stall can be set up to pre-

diet the increased blade flapping, such a program would be eonsiderably

more costly than that presented in this paper. Comparison of the test

"date with the numerical analysis indicated that retreating tip stall did

not significantly change the pitching moment around the test helicopter

moment center. Although the hub moment was increased by the increased

blade flapping, the tilt of the rotor thrust vector woe concurrently de-

creased due to increased drag on the retreating side. Therefore, a more

sophisticated and costly program was not considered necessary to obtain

valid aircraft pitching moments about its moment center.

Derivatives of the wind tunnel pitching moment data with the horizontal

stabilizer both on and off were used to estimate the stabilizer effective-

ness and downwash. For unatalled conditions the downwash was found to

V 7M

HUGHES Tool COMPANY-AIRCRAFT DIVISION 369-A-8020

A SMODEL RPOT NO. PAGE 3

_____,_MY R. B.' Rohert Aerodynamic Teats of an Operational OH-6ASCNaCKED 3v . V. JEF5or-ge- Helicopter in the Ames 40' x 90' Wind Tunnel

be approximately 1.2 times the rotor induced velocity. This average value

as of comparable magnitude to those presented in the technical literature.

Rotor retreating tip stall reduced the effective rotor disc area, and

hence, increased the downwash velocity at the stabilizer.

Level flight performance as measured in the wind tunnel shows excellent

agreement with flight teat data obtained from a similar ship. Load@ date

.how good agreement with flight data.

~ 1

ii n

"9711" ' " ". . ",.

~ 370.......... ..

+J ANAL YSIS -.... O I "P0KPARtE . U. U hDk• AMy dR.Amic U"essts of ma OperZo~ • 01..-6A| €.CHCKED BY a-.V. 1100'W•L•p'AW in tbbm JOBS 40' X 80' Wind TWU19 e ,

"-J I "

13-0 M 'O

The Hughes Tool Company - Aircraft Divlsion..as conducted a v

I~ ~ mal test of an operaticm prototype . (K-.& beR4*qtOt,

[ ~SIN 62AW126s eqaipped vMt productioun bladeso in the X4A AMU

Il0ft. z B0ft, low Speed vind tume1, April 23 tbru OW~ 8, 106.

noe majar objectives of this test aewes Were:

L(1) Explore heliaopter and ror componenit stability aariv-

tives and pe-ti incluwdi establisbhmt of amV

L (2) siagAt. the use of inceased solidity by coamdwUlg

ia a portin of the n tunnel tests at valuss of thrust

ownespoing to values of "•/o" &ppruxintely one-half

current flight operationa values.

I(3) Oonduot analytiaal studies Involving the wse of digital

oamputing a ique for use in oamperisom vith the

vind tunnel. experimental date.

I (1) Nsas nt of rotor blade ma rotr support mat monment

for comparison with applicable theory mad cwrloation

Vith a6valable fliht test 4ata. HOvS IO• th seas 1-

tivity of the mast bending aent Inst-mntation vas

inadegquate for proper detemination of the bending

moma-ts oprodued by the inll flapping angle, and

thrust vector tilt encountered during the vind tunnel test.

.97041.

................ I I I I I I I I.I.

HuGm o HUN-IRRF DIVISIONANALYSIS- n- UMOEL ftp . PAea

PREPARED BY a . qtw Aerodusmic Test& of an opeational Oli-6ACHECKED MY~ ft. 7V. M ZaimsJleliccpter in the Ameis 41~~ x 80' W~nd Tum

hata plots* thulated reults,. and their analyseos IWIVAing

cqwisms vith applIceb1o tbecrisa, re3.Atve to the Aban

test objec-tives ane pesented. hwel. On test edvame ratios,

",ddM .25 to .400 used fmc the iajccity of the testfrm, ccswespa

to heliopt~fcrawed f24gt speeds of approximt.1Y 93 to 1514

knots. bdo data polmU. wene @@lletotd at/" 'A4 (169 k wO).

6=9 bavWrn s vwaee auc~tecl with tviel test seation roof

* ~~~damcs openad med closed. ftaes ver priaa'13y row' opertibma

ohmakAaut the b sllooplsandmitstion Prim to

operstion of tUe vin tiwnl. Swvpart toze and interfee

nina were ocaMted mid the data coccreoted for these effects.

.1704

IIJHUGHES Toom COMPANY-AIRCRAFT DIVISION 369-A-8020 6U M~yI...MODEL MiLPORY Nos, pAGg

PREPARED my R. E. ghet Aerodynamic Tests of an Operational ,.--CHICKED my S. V. LaIorge Helicopter In the Ames 40' x 80' Wind Tunnel

4.0 NOIENCLATURE

4.1 Notation (Analytical)

Ab 29.625 ft 2 , main rotor bled' area (4 blades)

A1 = Lateral cyclic blade angle, dog:#es. Positive is bladeleading edge down att= 0 9"

as Longitudinal til t of thrust vector, degree s. Aft tilt

is positive.

alLongitudinal flopping, degrees. Positive is blade tip

Seca down at co0e.Br 9 Longitudinal cyclic blade engle 4egreem. Positive is '

! B~sblade leading edge down at goo90.

S~~~bls aLateral• 0.flapping, degrees.\ Positive is blade tip down i

ba' Lateral tilt of thrust vector, degrees. Tilt to r~ight

is positive.

,C• Section lift coef ficient.

Cd - 'Section dreg coefficient.

CmLL q AbR

Ab R

%/• f Ab ( R)Z R

* ~C,

2 Aa, (flR) ZR

C Tr /a L0Ab (CIR)

2

Cx DCx V Ab;: (n•R)2

D - Drag, lbs,

L - Lift, lbs.

Rolling moment, lbs-ft.

'74 Rev. 7/15/71

HUGHES TOOL COMVPANY-AIRCRAFT DIVISION 369.*.kA80207

PREUPARED BY R. E. Rahtert Aerodynamic Testis of an Operational OH-6A

Nib

M Pitching Mome~nt, lbs-ft.

me " ~mnt center. All moment data were 'reduced about amoment center located at W.L. 36.43, F.S. 101.85, B.L. 0.0.This corresponds to the intersection of the' skewer pivotbell (pitch) axis with the mid-plane of the fuselage.

q 0CDynamic pressure, 1býi/ft 2.

R =13.165 ft, main rotor blade radius.

V1 a Tunnel speed, ft/sec.

CK Shaft (mast) angle, degrees.

X Inflow ratio.

p Density, sl~ug/ft3,

O b/rR .'0544, solidity ratio

.7Q Collective pitch angle, degrees.

.CR -T,.p speed, f t/sec.

4.2 Notation (Configuration)

B Main rotor blades (4). Rot~or disc -26.33 ft in diameter.Constant blade chord - .562 ft, NAiCA 0015, 9' washout.

F Model 369 (OH-6A) fuselage mounted on skewer throughxcargo compartment together with the Model 369 lower verti-1cal stabilizer attached to the, tail boom oupport (TBS).Lower vertical span - 27.5 inches from boom centerline, area

1.78 sq ft.

H Horizontal stabilizer. Chord -16.5 in., NACA 0015 airfoilsection, span 67 inches from boom centerlines, dihedral

-25 deg, area 7.68 sq ft,

K - Dummy skewer. Used only in conjunction with support.tare runs, to determine skewer interference corrections.

livMe. 7115/71

HucHEs ToOm COmPy- AIRCRAFT DIVISION 369-A-8020ANLYIS......MODIEL REPORT NO. PA09

PREAREO R. E. Rohtr - rodyiiamic Tests of an Operational OH-6AS.V. LForge Helicopter in the Amies 40' xc 80' Wind Tunnel

[R ft Main rotor hub.

jT wTail rotor. 2 blades. Rotor disk diameter - 4.25 ft.

V w Upper vertical stabilizer. Span 50.0 inches from~ boomn

£centerline, area 3.84 sq ft.

9" Rev. /15/7

HUGHES ToOm COMPANY-AIRCRAFT DIVISION 369A-8oANALYSIS L. T-LodN - MODEL REPORT NO. ,"AGE 9PRtEPAREDu NY - B_ R_ ,. Aerodynamic Tests of an Operational co-6AjCHECXKD my 51, - UsTm~ Helicopter in the Ames 40' x 80' Wind Tunnel

j~5 .0 MSMIPTlIM OF TEST COFIO_.AMI0M

proottype, sl 62-4216, was installed in the Ames 40' x 80' wind• ~t~ae3. on the t•Infel three - support external balance. Photo-

•aphs of this installation are presented in Pigs. 1 and 2.

As illJUtrated in these figures and the installation drawing.. (Fig. 3) the ship was supported on the two forwar-d (main) struts,

• Located cxi 1614" centers, by means of a 5" d~iameter skewer passing

thru the windows of the helicopter cargo compLiment. This

skewier was attached by a steel truss adapter to the underside

of the rotor mast base by means of the same four bolts which are

used to attach the mast base to the fuselage structure. The

helicopter pivoted about the center line of the 4" diameter ball

socket assely mounted stop each of the two forward struts.

2w center line of the 5" diameter skewer was 5.83" above the

ball centers, i.e., above the pitch axis. Wind shields were

provided around these forweArd struts. The protrusions above

the wlnd shields and the skewer itself were unshielded from the

wind. Correction for their effects were evaluated by the support

"tare rums which followed cmpletion of the production data

runs. The tMeahmmt of the two forward struts to the balance

system scales was suuh as to provide rea.outs of lift, dragi,

-.. rolling mment, yawing moent and side force.

•* .- 704

HUGHES TOOL COMPANY.-AIRCRAFT DIVISIONANALYSi MODE. L R911%4 NOL PAGE 10

PIA49PAfE * R.0E Rbhtwt -. Aerodynamic Tests of an Operational CH-6ACHECKED BY 3- V-oT " E' - lHelicopter in the Ames 40' x 80' Wind Tunnel

The instr.mntation and control actuator leads, the fuel line,

and C02 fire extinguisber line were run into the helicopter

thwu thie hollow skaew".

VFig. 3D preseuts a three-view drawlng of the OH-6A.

5.2 , S

The least count of the Ames pitch balance thru the tail strut

"was too large to provide meaningful pitching moment data fo the O-

6A hielicopter configuration. Consequently ITM-AD personnel

desiged and fabricated a two-component strain gage balance of

adequate sensitivity for the determination of the pitching moment.

the IW3C-AD Tail Boom Support (23S) is shown best in figure 1,

"connecting the Ames tail strut to the helicopter tail support

pivot.

The RTC-AD Tail Boom Support performed two additional functions.

Ffrst, the spring (50 lbs./in.) and damper (standard OH-6A lag

dsmper) combination eliminated the ground resonance problems

associated with attaching tie tail boom directly to the massive

Ames tail strut. Second, as the load on the TBS spring changed

dixing a test run, the fuselage angle of attack changed from the

nominal value which had previously been set by the Ames tunnel

operator by means of appropriate positioning of the Ames tail

strut. The linear actuator, cont~rolled by the HT-AD console

operatco was used to provide vernier readJustment of the fuselage

angle of attack.

1.

HUGHES TOOL COMPANY-AIRCRAFT DIVISION 802MODELRE~

ANAYSI R.L. l-00 ýa*PAGE 1I ,R.AmEDa.y R-. r. R.nht.w-t .rodyn•n•c Tests of an Operational o,0-6A

cHIEcKEo BY S.. •Helicopter in the Amen 40, x 80' Wind Tnnel .

15.2 TfRoi BomSprt, (Continued)

I mutt (=Let) sigl.e of attack 4)was fed digitally into the

Awms data acquisition system in conjunction with the external

I'I

ba~lance readings,, exclusive of pitching mom~ent. In addition

Ic< was manually recorded by the helicopter control console

operator.

1 ,70

'• L 704

i HUGHES TOOL COMPANY-AIRCRAFT DIVISIONANALYSIS R. - ?•MOPREPRED Y it 1RhtdI Aerodynaic Tests of an Opertiona OH6A

CHECKED BY .2.V Raze-f I Helicopter in the Am 41 80'

5.3 &ww_ Interference Cnfiguration

In .,der to detearmine a correction to account for the interference

of the skover support during the production data te.ts, an

auieliary support was ut'ilized as Illustrated in figure 3s. Data

were collected over a range of Pc at two dynamic pressures,

horizontal stabilizer on and off, with and without a dm= skewer

Sinstalled. The incremental effect due to the presence of the skewer

was used as a correction in the Ames balace data reduction

progprs., and to the pitching mnent data obtained from the ail

Boom Support balance. 2he pitching moment correction vas muai.

I9

*5

1~

S ';: • 704

--. ,i- -. -- * --

HUGHES ToOL COMPANY-AIRCRAFT DIVISIONANALYSI - BL_ Floo MODEL REPOP•.V AIE 13PREPARED gy R.U. aohtert Aerodynamic Tests of an Operational OH-6AcH.cKEDoBY B. V. wow Helicopter in the Ames 40 1 x 80' Wind Tnnel

fTe helicoptw control console, designed ard fabricated by

NTC-AD0, v located in the wind tunnel control room so as to

provide optmzwn coodination between the wind tunnel operators

and the helicopter operators. This control console provided

remote ontrol and monitoring of the helicopter. For operating

effectivness, it was divided into two adjacent panels: The

left being the Flight Control Operator's Station; the right,

the Engine Control Operator's Station.

At the Flight Control Station were those switches and panel

"monitaring instruments required for establishing aircraft angle

of attack, tail support angle of attack, lateral cyclic position,

longitudinal cyclic position, and pedal position. In addition,

there were instrents for monitoring the lateral flapping and the

longitudinal flapping. An oscillograph record switch was also located

on this panel. However, duing actual test operations, the oscil-

logaphs were operated and monitored by HTV-AD personnel who

marked the applicable data point number on each record as it

waz taken.

"The Engine Control Station had the switches for 11OV AC power,

fuel valve starter, throttle, 1N2 beeper, end collective. Panel

instruments were provided for monitoring collective position,

970

• ". ................. ............ ..... ..... ".....,,................_.... .... ,...., ...., ......................... .......... . .,............ "..........'". -

HUGHES To00. COMPANY-AIRCRAFT DIVISIONMODELFt EP&;A. 0O PACE 1ANALYSIS- R. L. 13M _ý MO

PRtPAfED SY It. R. Rnhta. t c Tests of an Operational CKE6AcNEcxtolV • V mye.•£ Illelopter in the Amues 40' x 801 Wind Tuanwl

$.4 Helicogtr •Cotro:, Console (Continued)

throttle, N 2 , rotor rzpm, NI, VTT, torque, DC Bus amperes, engine

ruming-time clock, engine oil pressure, and engine oil tamp-

ermtue. Panel warning lights were provided as monitors of

M transmission oil pressur.e, oil temperature, and chip, 'mtrsnmissaon chip, engine chip, and fuel clog.

Both the Flight Control Operator and the Engine Control Operator

maintained a running log of the operational data on his respective

console coded to the Run Number and Data Point Number. In addi-

tion the 50 channel oscillograph record nmwber was logged.

'The layout of the panels on the control console are detailed

on the Ref. I. drawing.

The primary rotor controls, collective, loLaitudinal cyclic, and

I lateral cyclic, were variable and powered by electrically driven

screw jacks mounted in the cockpit. The rotor power and speed

were controlled through the engine fuel control and the engine

,, governor*. There was a remote "beeper" switch on the control

console to change the governor rpm setpoint.

I 9-iiiE .o

11

HUGHES ToOL COMPANY-AIRCRAFT DIVISIONANA LYSIS 'MODEL REPOA "Z

80 PAGE 15

PREPAREDO By R •lht.t Aerodynamic Tests of an Operational aR-6ACHECKED BY . V. Ts'oRCg"e Helicopter in the Ames 40' x 80' Wind Tunnel

5.5 Instruentation

In addition to the Awa external balance data, up to 53 channels

of oscillograph data were recorded throughout the test on two[ oscillogaphs, one of 50 channels, the other of 18 channels

dfrectwriting. The latter was used to monitor during each run

"significant load values, principally pitch link load, mast

longitudinal bending and tail boom vertical bending to insure

that the aircraft was not being subjected to excessive loads.

The list of the oscillograph recorded data channels is presented

in Table I. Main rotor data obannels, i.e., items 1 thru 17

of this Table, in addition to blade flapping position, required

use of a multi-channel slip ring assembly mounted atop the

rotor mast assembly. The electrical leads from the stator side

of the slip ring assembly were fed down thru the hollow mast.

Mast bending strain Gage leads did not require use of the slip

ring since on the (8-"A kellcopter the m•at is f1Xed, the drive

shaft rotating inside the mast to drive the rotor blades. The

rotor blade loads are transferred thru two main bearings to the

fixed mast.

The outputs of the control position potentiometers were fed to

the control console meters as well as to the oscillograph. A

blade flapping resolver was installed on blade No. 1. The re-

solver was mechanically constructed so that its flapping readout

I D4

HUGHES TOOL COMPANY-AIRCRAFT DIVISION369-A-8020YMODEL . nREPORT NO. PAGE 16

,*vPREPARED V It. E. Rohtert lAerodynamic Tests of an Operational OH-6A

SCHECKED BY. S. V. LeForge iHelicopter in the Ames 40! x 80' Wind Tunnel,

5.5 Instrumentation ", Continued)

." was not affected by extension of the blade retention straps

under centrifugal loading adr by feathering nor by lead lag motion

of the blade. Suitable electronic circuitry was provided to

rnsolve longitudinal flopping and lateral flapping and thus

give a direct continuous reading on the two respective meters

i+ located on the control console. In addition, the output of the

flapping resolver potentimeter was recorded on channel 22 of

the 50 channel oacillograph.

In parallel with the HTC-AD oscillographs, several of the data

channels mre recorded on magnetic tape for subsequent automated

data reduction by NASA-Ames personnel.

[i

Ii

iii

L *74 Key. 7(I1711

HuGHEs TOOL C OPANY-AIRCRAFT DIVISIONý ..A..oW

ANALYSIS ..-. In a n MODEL 'r NO. PAGE 17

PREPARE D MY- R_ nhtA.•t -- Ae'rodmmic Tests of an Operattonal @-6ACHECKED §V. a. V. TPgcu, f_,blicopter in the Ames 40' x 80' Wind Tunnel

6.o. _ _ A .UM RMLTION

6.1 %I~anoe Osalibktion:

fe t re-supaa't ex0ter balance of the 40' x 80' ft. wind

LI titnel had been previol callbrat~d by NASA - AMES personnel

p in accordance with the -AMM standard procedures.

[ .6.2 al, ce Data:

Ba.lance date, were red.ued in acez'dance with the NASA - AM

standard crnputer propx Weight toe corrections and support

I, interference tare corr ct ons based on the support interference

runs were Incorporated in the data reduction program. Me final

HASA reduoed data wre available in a tabulated format

appropriately coded pe rn number ,and data point nuber.

Pitching Moelnt Data omthe AMS three - support external bal-

&we is not usable. It had been established in conferences

between AMS and HIV-A •rsonnel prior to the test that the

least count of the AME 4iace was too great to achieve

meaningful accuracy in pitch data. Consequently in lieu of

the AMES balance, the I hing monent data were obtained by

means of an W C-AD des ed and fabricated strain gage balane on

the tail boom support,

The NAMA reduced data *aesented in Appendix A, pages A-1

through A-51.

974 Rev. 7715/71-

HUGHES ToOl COMPANY-AIRCRAIT DIVISIONANALYSIS L-20 MODEL R 1--2 PAGG 1PREPA•E•tE .my 1t3.- t _ _ Aerodn'• eic Tests of an Oper.tional Cm-6ACNKCmC my S, V, I1"=fte Helicopter ~nthe Ames 40' x 180' Wind tunnl

6.3 TAU DOGS Suit orb Dalane

Because of the ack of sensitivity of the AMES pitch balanc i,

=-AD designed a tvo comonent strain -a;e balance on the 1tai_.

bom su8pcpt. This balance measured the uxial and normal foces

'e• at the tail pivot attacbment point. Readout was onohanne3

8 and 9 of the MC-AD 18 - channel oech In adt anthese date we~re record•ed in parallel on ti"•:.q tape. MU• tape I

S . ~data were reduced by the AMS cocmputer p• ~~ and treanmi, ted

:.to MC- in tabulsar foovat. Sufficient oecillograph data points .i. vecreread a• -AD to establish the 'va~l dit, of the aumtd :

7.,• reduction. The AMES values wer~e then used to compute the ýItch-

3.

,g moments about the helicopter pitch • is.

ttap

"Pitchese. at a w , da werec i rel for eight tares anddappt interference prior to conversion to the coe muiclte d ormt

41 t used in the data p re ation graphs. V ule are tobulaph d a n pages

e-52 through A-55 of Appendix A.

""ftlibration of the tai boom support boa rce was conducte(ý overthe appldc.ble L Soad range in the -D ldorstory wprie th o the-

•tunnel test. Standard osoillogreph R-C• pronedures wez4' usedm athroughout the a eltal test.

S6.4 S'terain (1ae rumntationz

Phe strain g dae instrumentation listed f Tle I was ,,, ed

apt p-AD pritr to shipment to the hel e opten to the wi tm l.

Since this insatarentation was phs. V1cato that used on a fullge

17

A-52 Chrough A-5 if Appedii iii ip

HLGHE• TOOL CO .MPANY- AIRCRAFT DIVISION $6.-A-.o -I ~ ~ANALYSIS ,.MOEMrpqN.

PAE"! -

: PIEPARIED BYB Te-t of an c•mst-ona

lWt

10eIw M V- i• the Ames 40, xc ino u awl

instrumeamnd flight test klicoptar,, standard cailibration pro-cedures wie employed by f-AD calibration and electronic personnel.

Standard pscillogaph R i. procedures were used throughout the

ifatual t" t.

6.5 Position ;tibraltions:

Following installation in the wiznd tiunel, with the helicopter

set at zero, wind of,# final calibrations were conducted for

all posit Lon potenticmet's utilizing a precision in$llnmter

or scale r required. Mue oscillog-aph readouts and control

oosole readings were suImtaneously recorded against the in-

cllnomeU (or scale) re&d ings.

Ir

1.

IiIiI

3704r

HUGHEs TomL COMPANY-AIRCR rr DmVSION 6-80 2

ANALYSIS- MOE 4pok O AEP

PREPARED BY R. Z. 1Rohtert AairodYrAni Tests of an Operstiami (E-6ACHECKED my S. V. Lamcre Relicopter in \tk Awes 401 '8 IS Wind ftwel

A cczplete log~ of the tunnel test rms,, th, oscillogaph data

recordso Wn tabulated reduced data for 'Ut test series ar

available in tbao .=-AD Technical Departme t files. !wsnty-tbr'ee 'data runs (470 data points)., four suppor are ~mm (52 data Points),

andl seven static veight twoe runs were madi'.. Helicopter engine

operating time vas 35.*7 hours. Tunýel occi i ncludling

setup and teardown vs24 shifts. The tur el operated ona two

shif'ts perday basis, 5 daysu/eek.

5i II HUGI ES ToOL COMPANY-AiRCRAFT DIVISION 36 -A 8o2o

P~PIAPZD gy R. E. Rloer Aerodynamic Teste of an Opir raionsl OI-C.____E ____11_____1E9 Helicopter in the Amex 40' x 0' Wind Tunnel

8.0 DATh ANALYSIS

8.1 •:thod oý Computing Theoretical Stability Data.

iTs theoetical method used herein to compute stabili erivatives

I i mslainpi and is inexpensive to run. The comparisons f theory and

t at dats show excellent agreement. Consequently it 1 elt that

ti is co puting method is adequate for simple helicoptlrs of modest

a ad -0.35). Some of the test data show eviden aif retreating

t!P sta i. For these the agreement with theory is on y sir. A

I f w dam points were run atyA - 0.4. These data are quite scat-

tred dad the agreement with theory is marginal.

Týe the pretical stability dots used to compare with ta y ind tunnel

test doe were obtained by means of a digital compute p ogram,

b sed o References 2 and 3, which numerically calcul ted the oero-

dynamic characteristics of the lifting rotor using th assumption of

uniform induced velocity and ignoring the effects of blide flexi-

lility. This program employed a strip analysis in cc piting the aero-

"ynamic forces on the blades. The aerodynamic forces, In conjunction

ith ce trifugal, inertial, and weight forces are coai ed to solve

or the blade flapping. Knowing the flapping, the 1c a=. blade

angle cf attack and the aerodynamic forces for a tri•i cndition are

#btain d. The angle of attack and Mach number of each, ocal blade

ectios together with the tabulated blade character iti s determine

he se•etion c and Cd. The lift, drag, and torque if ach section

a the computed.

_ _.. -... .{ f ..'

HUGHES ToOL COMPANY-AIRCRAFT DIVISION 369-A-8020MODEL REPORT NO. PAGE 23

ANAI!VYSi E Aerodynamic Teats of an Operational OH-6APlRl[PANl[Y *.I 'oher - Helicopter in the Ames 40' x 80' Wind TunnelCHECKED my S. V. LaForge

Since the rotor blades of the test helicopter incorporated the MACA

0015 airfoil section, the tabulated values of C and Cd were ob-

tained from the data of Reference 6. This reference presents C2

and Cd as a function of angle of attack and Mach number. These

"coefficients were synthesized from hovering data of a rotor with a

0015 airfoil section.

In addition to the blade section aerodynamic characteristics and the

physical characteristics of the rotor, the other inputs to the

computer program include: collective (00.75), longitudinal and

lateral cyclic pitch (BIs, A1 e), Inflow ratio (\), and advance

ratio • ).

The outputs are longitudinal and lateral flapping (a1 and bls),

thrust, hub moment, thrust vector tilt (a'. and b',), and shaft angle

of attack (0< s).

In performing the wind tunnel test the cyclic control was positioned

so that the aircraft was trinmmed to zero longitudinal flapping angle,

-is. In the digital computations this trim condition was obtained

by holding the collective pitch at the corresponding test value and

varying the longitudinal cyclic pitch, BIs, and inflow ratio, >1

to achieve the test values of thrust and zero flapping. After the

trim condition was obtained, small perturbations were made in the

proper parameters to compute the derivatives. Since shaft angle,-.•s,

is an output, dn iteration has to be made to hold'< constant when

IA' I?* I I.i

HUhmn ToOm COMPANY-AIRCRAFT DIVISION 369-A-8020ANALYSIS MODEL NEPORT NO. PAct 24PRPARKA RV. otert Aerodynamic Tests of an Operational OH-6AcH•E• Eo a 8. V. Lelorge Helicopter in the Ames 40' x 80' Wind Tunnel

obtaining the derivatives with respect to control positions and,.0

Page 25 presents a flow diagram describing each step in the iteration.

41, Additional details of the computer program are described in Appendix C.

Figure 4 shows a schematic side view of the test setup. All moments

were measured around the moment center shown. Therefore, the cal-

culated hub moments and shears were transferred to the moment center

for comparison with wind tunnel data.

8.2 Sumaery of Measured and Theoretical Stability Derivatives

The following table suranarizes the rotor stability derivatives obtained

during the wind tunnel test and compares them with computed deriva-

A. tivee. The more important longitudinal derivatives are discussed in

detail in later sections of this paper.

The derivatives with respect to collective and cyclic stick were ob-

tained using the stick motions measured at the console. Plots of

console collective pitch angle vs blade angle measured on the cecil-

lograph record show that the flexibility of the control system re-

duces the angle of the blade by 117. to 14%. The cyclic stick is more

than twice as flexible as the collective stick (stiffness of 7000

ln-lb/.ad as compared with 16,370 in-lb/red for collective), so it is

expected that the cyclic angle at the blade would be reduced 25% to

31%. The deflection of the control system is a function of the

pitch link load; therefore, the difference between the console measured

angle and the blade angle is a function of flight condition.

HUGHES ToOm COMPANY-AIRCRAFT DIViSION 369-A-8020MODEL REPORT NO. PAOE 25ANALYVSIS L

PREPARED my R. E. Rohtert Aerodynamic Tests of an Operational OH-6A

CHECKEDo.. S. V. LaForge Helicopter in the Ames 40' x 80' Wind Tunnel

X - X P+yax I'.l -r~ etors

Where X ta 011t of (B| ,the F oklowwl P,&rameteri • hb' "Tr~ q Ub X b

,75 1 "1S, AIs, u b

First Etimuate

Rotor n tk.. m • \ Subrouti.oSerformance OuPori r]&h

SSubroutine

Ouutputb a .C' , [

";" •an1 I = (al*)l "(et.)5

o.db ".I ~ i ~ ~ 1

T-, (as-ab) e O,

Compute Rotor C~~~OtpuCt,.q .0C~(1

•Zm __Cm- -mb

Sre, ,-(6• 6)b

4 -00 obtT oi-r

nd N.Compute Rotor -"-- CTpeq) < 0. 05C (81,4 01,lb

Derivatives 12 - X'b 4 4k

Em, Cw"Clb

b a AXI" Etc

i, / Rotor

Pe rfla r ] fob,4X Completed S

P"All Other Inputs aamtr

Roto yes Output

11krom, n (AT'Z ... ZA

u40I'-T &Isj, We8 iET CTZ" CT b

Comliat•.r Rotor I-a• •~ I It, . 0 SolveDerivatives for

bo Mg lA-o b 1b X r . T_

"- .$ ,... .. •,,, -- . . .,,• _ _...._._ . - .. .. ..

tiUGM TOOL COMPANY.AIRCRM~ DsIVION 369-A-8020MOPIL REPORT "a. PA~t 26

PeP to LmyA Ig I ahte:t ,nrodynsuic Tests of a Operational OK6AcNZcKsos by, S. V. ILo~orlig Helicopter in the Amts 40' x 80' Wind Tunnel

TALEX 1. 8TUBILtT RlWIATLVWS

Li 0.25 i 0.30 u w 0.35

Derivative Test Theory Test Theory Test Theory

ba /bas, deg/deg 0. 15 0.14 0.32 0.20 0.25 0.Z8

S CrIoi/;Js,/deg 0.00014 0.00013 0.00019 0.00018 0.00025 0.00024

0.005 /deg ,'.OO 00056 O.0065 .0.0069 0.0086 0.0086

6 C /a/ ,,/deg 0.00009 -0. 00004 0.00010 -0. 00005 0. 000ZS -0. 00004

Alal /4 B1 s, deg/deg -0.98 -1.17 -1.08 -1.Z3 -1.25 -1.36

BC /0 i/BI/deg -0.0009 -0.0013 -0.0009 -0.0013 -0.0010 -0.0014

6 Cý/o/,B 1 , Ideg 0,0040 0.0056 0.0048 0.0070 0.0058 0.0082a

aC /016Ag i /deg 0.0008 0.001Z 0.0008 0.0011 0.0009 0.0011S

6A /'a0.75' deg/deg 0.60 0.82 0.76 0.96 1.35 1.43a

6C /a/b, 0.014 0.013 0.015 0.015 0.007 0.010

"This table shows good agreemnt between theory and test in the speed

stability and the derivatives with angle of attack, except for the

derivative of roll moment with angle of attack. These test data show

hysteresis and the differences have not been resolved. The theo-

retical derivatives with collective pitch are 11% to 14% high and the

derivatives with cyclic pitch are 25% to 31% high due to the flexi-

bility in the control system. It can be seen from the table that

when the control system flexibility is accounted for, there is good

agreement between theory and test.

1__

HUmID TooL COMPANY-ARCRAfr DIVIS 369-A-8020 G,UOL miar NO. -PAQ9 27

AN ALYIS

PM9PAMRB If 14. 19. I@httrt Aerodymnmic Toots of an Operational OI-6AC4CKeDS s V . Ial7ue - Helicopter in the Anse 40 x 80 Wind Tunnel

8.3 Lot

rigure 5 presents a plot of longitudinal blade flapping versus shaft

angle of attack. The theory, shown as a dashed line, coipared veryi~jwall a!tA ft 0.25, but deviated from taet at the higher values oý^7he theoretical retreating tip angle of attack is printed next to

the trim point. O- point (0-,A 0.35)and 80.75 " 10') has a

1 zretreating tip angle of attack vell into the stalled region. This

"teot point shows the effect of stall in increasing the change in

blade flapping with shaft angle of attack, Stall reduces the lift

On the retreating blade and also shifts the airfoil center of pros-

I. sure towerds the trailing edge which tends to tyist the blade nose

down. Both of thee effects increase flapping. The theoretical

progrim accounted for the decrease in lift but assumed rigid blades.

Therefore, the effect of dynamic twisting of the blade could not be

- determined.

ligure 6 presents a plot of the change in longitudinal cyclic pitch

vith change in shaft angle of attack to maintain zero flipping.

The values of d l/ , from test dats are somewhat greater

than theory. The values of Big were obtained from stick position

Sam measured in the cockpit. Due to the flexibility of the control

system, the actual values of B, at the rotor are less than thea

Svalues calculated based on the static calibration. Flexibility ue

discussed in section 8.2.

0 W. 771377

u TOOL COMP A .P-.R=Ar, DIVISION 369-A-80204.,4-L IMPORT NO. PAct 28

PANPALYS 1 at. . htart Asrodynow'ia Tests of an Operational Oii-6A

C9CK6e OSV..0. V'. 'IaForge Holicop,*.r i. the Ames 40' x 80' Wind Tunnel

8.4 Rotor Pitchimn &cnmant Derivatives

Figure 7 presents a plot of rotor pitching moment versus shaft angle

of attack. The test points were obtained by subtroctiug the moment

due to fuselage and rotor hub from the total pitching moent; thus,

they represent the moment due to blades only (except for blade-

fuselage interference which should be small).

L Figure 8 presents derivaitives of ) 7 obtained by reading the

slopes of Figure 7. The agreement between theory and Qest is excel-

l lent. At a.75 a 100,1• 0.35 the agreement with test is good

1•! even thogh the measured flapping ims considerably greater than

theory. This point to in the retreating tip stall region, which

increases the dreg on the retreating blade and tends to reduce the

aft tilt of the rotor thrust vector. Therefore, when the umeunt is

*1 transferred to the test moment center (aircraft center of gravity),

the increased nose up moment due to increased flapping is offset

by the reduced moment due to reduced thrust vector tilt. At, A-w 0.4

there is a considerable amount of scatter in both the flapping and

pitching moment date points, so the comparison of theory with test

r' • data is inconclusive.

8.5 Thrust Deriv&tive

Figure 9 presents C'T/C" vs8o< for the values of advance ratios

teasted both horizontal stabilizer on and off. Figure 10 presents

[ the derivative C4 CT'* vs AA. These derivatives were ob-

ING ev. 7715 M

II l~usHum TOOL COMPAnY-AIRCRAFT DVISON 369-A-80200O"L • O• .N*. 29

ANALYSISSPRZ .O SPY .. E. Igohtrt Aerodynamic Tests of on Oerational O,-6A

.ECceD y 8. V. loHelicopter In the Ames 40' x 80' Wind Tunnel

tained from the slopes of the curves in Figure 9. Theory is also

- shown on figure 10 and is in excellent agreament with test data.

8.6 Stablizer Iffectiveness with Anjle of Attack

Figure 11 prements pitching m at data for the complete helicopter

in the form of C/u" vs'(* with the horizontal stabilizer "on" and

"off". Figure 12 presents the slopes of the data in the form of

0' as a function of.A' . (At,^- 0.4, there are uo

data "horizontal-on".) This figure wea used to estimate the ratio

of actual to theoretical davnwash at the horizontal stabilizer. At

"044 of .25 and .30, this ratio is equal to 1.2. At/,4. - .35, the

ratio is 1.0 for the unstalled test and 2.8 for the test conducted

with retreating tip stall. Rotor stall reduces the effective rotor

disc area, and hence, increases the downwea•h velocity. Thus, the

high value of induced velocity can be expected. The value of induced

velocity ratio of 1.2 is almost identical to the measured ratio

presented in Figure 33 of Reference 7. This reference presents

data obtained from a wake survey of the induced flow near a rotor.

8.7 Roll Derivative vith Anale of Attack

Figure 13 presents C /r- ve -e 6 for various conditions. Figure

14 presents the roll derivative with shaft angle as a function ofA..

The theory shown does not agree with the test. The theoretical

derivative of lateral flapping b, vs rotor shaft angle, 4W8, is

: ipositive, but the theoretical derivative of lateral thrust vector

9M0 Rev. 1131

III- Sb'}iM. . .

HuE ToOm CoMPAY-AIRCRAFT DivISoN 369-A-8020MOEL REPORT NO. PAaa 30

ANALY898pMpeAR* M IL. E. l.ohtert - Aerodynamic Tests of an Operational OH-6AC HK ED $. V. LaForge - Helicopter in the Ames 40 ' x 80' Wind Tunas

tilt, bWe ve 0<a is negative, therefore, when the moment was

transferred to the CG, the total became negative. The difference

between theory and test is unexplained but is probably due to the

low sensitivity of the balance system in relationship to the small

helicopter rolling moments.

8.8 onyAtutdinl Btick Notion Derivatives

Figure 15 presents a plot of longitudinal flapping angle a1 with

incremsntal longitudinal cyclic pitch , determined from longi-

tudinal stick motion. Figure 16 presents the flapping derivative

|de as a function of,^ . The test data indicate the flapping, due

to stick motion, is less than theory. This is attributed to the

flexibility in the control system. The longitudinal cyclic pitch

system flexibility is approximately twice that of the collective

system (sae 8.2).

Figure 17 presents pitching moment vs AB 1 , horizontal stabilizer

'off". The theory is also shown on this Figure. Figure 18 presents

pitching moment vs &Bla, horizontal stabilizer "on". Figure 19

presents 3Cm obtained from the slopes of figures 17 and 18, and

also shows the theory. As expected, the test is lower than the

theory, due to the flexibility of the control system. Figure 19

r shows that the derivative __ becomes more negative with the

horizontal stabilizer on. This is due to the change in downwash at

the stabilizer, which is a function of aCT '# . The derivative

[- " ] ... i .. .. "R.. ...ev........ 7/1...5 71.... "i" ... "•l ! I 1 1

HuaHES ToOm COMPANY-AIRCRAFT DIVISION 369-A-8020MooeL IMPoRT Mo. PAst 31AM ALYSISI..,.,,,.-o , : E. R.ohtert Aerodynamic Tests of an Operational 0H-6A

C t D D, s. v. Iyor jHelicopter in the Awes 40' x 80' Wind Tunne

"CT I haincreasea withl,.d ; therefore, the difference in moment,

stabiltzer on versus off, should increase with forward speed.

7.giura 19 shows this trend, but the absolute value of the difference

due to the stabilizer appears high. Figure 20 presents 4CT /1"[) B1ev both theory and teat. The test results are less than the

theory due to the control system flexibility.

8.9 Lateral Stiek eotion DerivativesIFigures 21 and 22 present lateral flapping, bta, and rolling moment,

respectively, as a function of incremental lateral cyclic

pitch, &Al.. Figure 23 presents the derivative of rolling moment

with lateral cyclic pitch • taken from Figure 22. Due to

flexibility in the lateral control system the test flapping and roll

moments are less than theory. Both the theory and the test indicated

"the rolling moment derivative is independent of Q at a given value of

advance ratio,...4

8.10 Collective St-ick gtion. Derivatives

Figures 24 and 25 present longitudinal flapping al. and lateral

flapping ble vs 00.75- As discussed earlier, the flexibility of the

control system results in a reduction in the angle of attack change

at the rotor. It is expected that the theory will be 11% to 14%

greater than test. This is true except for the run atA- 0.35.

The trim points have a theoretical retreating tip angle of attack of

11.2° which is into the stall region. As stall tends to increase

49704 Rev. 7715171

HUWrs TOOL COMPANY-AIRCRAFT DIVISION 369-A-8020I MODEL REPONT NO. PAOu 32PREPANEO DY R. E.. Rohtert I Aerodynamic Tests of an Operational OH-6A

CHECKEDDY S. V. Worge Helicopter in the Ames 40' x 80' Wind Tunnel

the derivative of flapping with collective pitch, this effect offsets

the reduction due to control system flexibility.

8.11 Saeed Stability

Figures 26 and 27 present Cm/c and CT'/Ga vu..e respectively. These

tests were conducted with the horizontal stabilizer installed. The

variation ofh ws obtained by changing rotor speed, rather than

tunnel speed. Consequently, the stabilizer lift is affected only by

the change in downvash due to the change in rotor thrust. The thrust

derivative is small; therefore, the effect of the stabilizer on the

pitching moment derivative is also small.

The speed stability agreement, as shown in Figure 26, is very good,

As noted previously, the case of/- - 0.35, 907 10 degrees, is

well into retreating tip stall, which increases the drag on the

retreating side, resulting in a forward increment of tilt of the

thrust vector. The moment change due to the change in thrust vector

tilt appears to be greater than the moment change due to increased

flapping, causing an unstable variation of pitching moment with,.,.

The theoretical retreating tip angle of the/4 - 0.35, Q 0.7.5' 8

degrees point is equal to 20 degrees. Thus, the stall is even greater

than the -0.7.5 1 10 degrees point discussed earlier. As expected,

the slope of this case deviates from theory to a greater extent.

T

II

K HuGHEs ToOm COPANY-AiRCRAFT IDIISION'M .LS . o]em•OOKL ftEPO•,T O. •AGE 3LAANALYSIS MODE L.P 0 PAG 32

PREPARD* .BY Aeodr±c Tests of an 4vpetiu0m Cl--aCHECKEODY ,. , U.Taen,, e.licopter in the Naen 10' x 80' Wind !iumel

Figur 27 iniae theowry imd vstinates byr a

amount. Tetest vabms of Cr4±meincixe the danlqmd

on the atabilizrw tbrf ore., test data Im"1xdes a anai.

ten that is naglected in the theory.

8. Level Flight PerfrMace.

FYw helicopter level fl3ght, the thrust is equml to the weight

and the zepulsive force =zt eqml the drag. T condition

inotained wben CX 2 badTh ti point

fr eachl•4 tested was obtained crosplots of 0 and oc

to obtain the rotor pover coefficient CP 50~j3 HP ef ore

this *o=3 be dme, CX bad to be corrected for the tare of the

tail vppcrt. Also, in order to ecmpe vith fli*t

pow inmmsi emmats contained in referewe 8, the drag of the

instrunentatiao vire pack, Ubich mas not I2al1y*d in the

tare 8upptrt setup, had to be reved. This drag was estimated

tc be one sque foot of parasite area. A compariso at

"o =.2 ponds,,_r R f ft/sec, and f: .0023o6, is shown

in:-figure 28. These data show excellent agreant with the.

fl dta 6&U ,.reference 8.

Best Available Copy

________________

H UGHES TOOL COMPANY-AIRCRAFT "V".SIUNANALYSIS-- . PAGE 32B

PREPAREDBY A___ It. Aeroxynmt of ant 'operational cH-6.A,C.ECED " Helicpte.- in -h Am, 40' x 80' Wind TInne

8. •aw L C•.r"uom

Ccpsm pploto are prese•ted for the rai.n rotor blade 15%

f3lavise cyclic berlding and main rotor pitch link cyclic load

as wtai=i from the wind t-rma I test and from recent fligh t

testa. Both sets of loads data are plotted as fctimos

OfrWU and C,2l0`9

EIanation of figure 29, 15% flapwise cyclic bending, shovs

m izatter i• the wind tunnel data, but no yronunced trend

with either Cp/4 or Va. The flight test data also show

scatter which is generally typical of thic type of flight

test data. The data do show reLaogele agrement. T flight

test data avere at a eavhatt. h led 1evel than do the

wind tmel dta. Bywever, stice the flight test data are

grouped at the higher values of C, and C/,, this result

1s not unexpected. It is sigjiicant to note that the endurance

limit was not exceeded fcw any test condition including the

highb/- of the wind tiu&,el test (equivalent to a forward opeed

of 154 k)mots, 2 points at 169 knots).

Eznii tion of figure 30, pitch link cyclic loads, shows

gene,-..,v less scatter than the blade bending m=cent data.

Otherwise, the conc ons arion are similar to those above.

Time histories of rotor loada as obtained fro-m flight test and frcxo

wind tem.n-l test are pr:-.nted in Fig. 35. lber.. is fair agree-

Stw = he-o sBofest Ava' able COPY

-Hwu TOOL COMPAY-AIRCRFr DIVISON--I ANAL.YSS •, K.. IL• 1?l 1f, -- .. .

,ARWA , ,Y 1 . i. godtr .... b ne iests of an operational W-.- c,,cRE Ay -. V. ] , a12 me Helicopter in the Awe 40, x 80' WiMA Ycuel.__ ,_._-__.___,_-

/

8.14 Collective Control System Flexibility

The values of collective engle,Q 0 4 5 , as used herein are those

read at the console, i e., a direct function of cockpit stick

position. Frop HTC-,D oscillograph records, the pitch link

average load has been read or selected runs and plotted in

Figure 3ýl as a function ofQ0 ..7 5 at the console. The slopes of•" dP

the lines faired thru these date pcints, i.e., d- oconsolef

have been used in conjunction with the value of collective

.etol syt sti essp -6,370 in-lbs/radian, to calculate

the expected cban e in blade angle as read by the potentio-

mt, on the blade feathering axis and recorded on the oscil-A,

For eaple at/I 0.25

Q f __ x._ ý.06:in. x 57.3 4.P lbs , .100

console bol-t0 onored.

S9 console X &Oco61e O• o-.i3.1ow. p

d~console

~ : n a ialaiAr man~e values of dconsole of 1.13 and 1.14

9" .Rev. 7/15/751

HUGHES Tomt CotAPANY-AiRcRAFT DIViSION 9Q

C~CBe 11R. .Taig 1 e~~ptar in tb- Ama 4 0 x 80r 'wind T-=e 14

wzre detamu±z f(,A /a 0 0310 and./1 a 6. 35 zmesPective1.Y.

Mume -~~w boe, been utilized in fairixg te I Ines tbra

%b Crrlmde dUplat of? Fiue 32 w" reets

Ye1 ~ M n kig into accmt the scatt~r in tbase

dats, the agenient between the slopes deeuzw priaa

an discussd Abn n the aettal 4 , is quite stisfact~m-

72*xibilityr be& been discussed above =de &12...

dest Available Cop

I; AA SHUGHES TOOL COMPANY-AIRCRAFT DIVISION 369-A-8020ANLYI R.ot L.Fod OE. - -RPORT NO. P~ce 35•npa, po sy RL. 2. R~oht•rt Aerodynami.c Tests of an Operatio~nal OH-6A

c•a g€ . .olly 8. V. ol.orge Helicopter in the Am*e 40' I 80' Wind Tunnel

II 8.15 Fuselage Characteristics

Plots of lift Coefficient (CL) and pitching moment coefficient

(CV*) are presented in Figures 33 and 34 for the Rotor Off

Configuration. These figures also present data collected in a

1/3 scale model of the helicopter in the Northrop/Noreir wind

tunnel (Ref. 4). The pitching moment curves are in good agree-

msnt for both horizontal stabilizer on and off. The Ames data

show a slightly reduced slope for CL vereusCmi in both coses,

am well as a negative shift in the angle for zero lift, which

is unexpectedly large for horizontal stabilizer off. Figure 33

also presents a computed value of pitching moment based on the

Multhopp body formula of reference 5 for a fuselage fineness

ration of 2.3, i.e.:

Cm* - 2-- K- L2. . 47 y * - .007228. l Abil .2-8.7 v '***

This slope is somewhat higher than those shown by the full scale

date and the Ref. 4 date. The Ref. 4 data were collected on a

1/3 scale model tooted at a IN/ft. corresponding to that of a

full scale ship at 55 knots.

U .SI

SHUGHmS TOOL COMPANY-AIRCRAFT DIVISION "A MODEL REPORT NO. PAGE -6ANALYS,,S... ... ,

PRKPARED By R. X.- RdhtAt Aerodynamic Tests of an Operational o*6ACHECKED MY S. V. lab= Belicopter in the JAs 40' x 80' Wind Te=1

9.0 Lin Or

1. =4rAD Vfwin 39- ', Ca.2. Camisole Ileyout-

2. RACA 51 3366, "A Ifthod fer ftudying the Tnaient lade-

?l.apping Bebaviev of Lifting Rotors at Excum~e Operating

odItmesm," Vy Alfred Oeswe and A' D. aim, Gated

Jw==Y 1955

3. ACA, T 3747,, "Equations and Procedures fo Numerically

Calculating the Aerodynamic Characteristics of Lifting

Rotos," by Alfred Genowi, dated october 1956

4. Report E-.AD 369.-8o1.2 "Aerodynamic Tests of a 1/3 Scale

Model 369 A Helicopter at Narthrop/Nozrir Wind Twmel - Test

Series No. 9," April 1967

5., Perkins and Hage, "Afrplwne Performance, St•ability and

Cut rol," MA. 5-26, page 226

6. MACA 21 4356, "llffect. of C urssibility an Raotr Havering

Perfawlmze ad Syntbesized Blade-Section Chaacteristics

Derived Measured Raor Perf ornice of Blades Haing

_IVA 0015 Ainfoai Tip Sectt s", by Jams P Shivers a0d

Pa-l J. 0,rpenter, dated Septmer 1958

m4

ANALSISHuGmE ToL. COMPANY-AIRCRAFT DIVISION PG

PREIPAREDO NY ~ .3II ~CHECKEDS myA

7. ~ ~ I OPa - (ci Amvisw oaion vth mvw r)

So.3.e !,m84" b7 SMY 11. NUs~, dated Apri 1956.

- 8. I== ftvojet 1b. 4-3-0250-.51/52/53,, Ngrt Two of fft

Pte,~ Resport of the MW~Ihnegf n1&%t 29st, Pertfcaoce

Pb&M at the Cu-" U.11copter.. Ubzued (Cleow) and Av=A

with the Un-7 or U-8 Weapon Bubsystw@0 19.S. AkW Avlastiem

-~~ lest Aattvity, Uilmow Afl, Califainia, dated Aagust 19&1.

r4

SHUGms ToOm COMPANY.AIRCRAFT DIVISION 3696A-802oMODEL REPORT NO. PAGE 38

ANALYSIS• __.__.rodna_ Tests of an Operati-ial Ow-6f

RCHECKEDY I Helicopter in the Ama 409 X 80' Wind Tunnel

TAMZ I

List of OsaLli9nrah Icordod data ,QPs agan a

50 Channel 18 MemanelItem Oscillograph Direct-Writing Osaillograph

1 M/1 Blade, Flopwise Bending, 15% 1

2 M/1. Blade, Flepwise Sending, 17% 2 -

3 M/i Blade, Flopwise lending, 301 3

4 /i Blade., Flepwie Sending, 507 4

5 M/S. Slade, Flaplifse lending, 701 5

6 (spare) -

"7 M/1 Blade, Chordvise Bending, 17% 6 -

8 M/i Blade, Cbordvise Bending, 507. 7 -

"9 K/i Drive Shaft Bending, No. 1 810 X/1t Drive Shaft lending, No. 2 9-

•,11 X/& Drive Shaft .Torque 10 -

12 MA/ Pitch Li~nk load -- 2

13 MIR• Festhering Bearing Support,

Tension 12

14 M/R Blade Retentian Strap, Tension - 16 (s)

15 M/i Blade Retention Strap, Bending - 3

16 M/i Lead-Lag Position 15 -

17 M/R Angle Position, Feathering 16 -

18 /IR Mast Laterel Bending(outside upper) 17

19 1M/R Mast Lateral Bending(outside lower) 4

20 X/R Mast Longitudinal Bending(outside upqper) 19

21 M/R Mast Longitudinal Bending(outside lower) 5

22 M/I Mast Lateral Bending (inside) 20

23 M/I Mast Longitudinal Bending(inside) 21

ma : (a) For run 3 only, CH.16 was long. accel. and CH. 17wae lateral accel.

... •,•_• •704

HUGHES TOOL. COMPANY-AIRCRAFT DMSMO 36-82

ANLSSMODEL REPORT NO. PAGM

PREPARED BY odyuamis Tonts of am Operational IG

&I. CHECKED NY alisopter In the Am* 40' 1 80' Wind Tumia

so Giatmal to Channel

24 Longitudinal Conitrol 1,1r, &md -6

25 SmL1 Acceleration at e.g. -7

26 Ship's Airsped 26

27 Engine Torque Pressure 27

2.8 Longitudinal Cyclic Position 28-

29 Lateral OyIelic Positimn 29

30 Rudder Pedal Position 30-

31 Collective Poseition 31

32 Throttle Poseition 3233 Tail loom, Support, Azial Load 8

34 Tail Boom Support, Vertical Load - 935 Tail toomn Support, Position 33 -

36 Tail Doom Vertical lending, 1Forward 1

37 Tail Doom Horizountal Sending,Perlward 1

38 Tail loomi Torque, forward -12

39 Tail DOom Verttc~1 bending, Aft -13

40 Tail Boom Horizental Bending, Aft -14

41 Tail loom Torque, Aft -15

42 Upper Vertigal Stabilizer,Lateral lending 34

43 Upper Vertical Stabilizer, LateralBending (near root) 35

44 Horizontal Stabilizer, Plepuriselending (near root) 36, 41 (b),

45 Horizontal Stabilizer, Flapviselending (near strut attaeh4) 37

46 Horizontal Saiie hrwsBending 38-

&ag~: (b) M1L36 shifted to CU. 41 (4-17-68)

~1-A.1....

HUGHES TOOL COMPANY-AIRCRAFT DIVISION •t.•.ee•o i'!•I .ootL ,-,o•T ,o. ,Ao•

,.L•,,,. ee ) i'

hlJ•W•r JJ t•e •,' •

JaN BOO V• t•mel

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&,? liorls4m•l S=abtlinr |g:ru¢

/844 39 -

.• • m (t per '€•) S0 - :S•9 likmmur !'oeition (ehipaC) 60 - i:---

:" •lel•tM hNl•m• 22

;" 5•, Ilmllo IF[4WIpdLwI •@eltlen •rm:rlq•J• •otmt•m•e= •3 -

, •2 2S.I:Lnl Code •8 -vii, 53 21sial 0040 17 (a)

!

ti l•o: I•1 •r t•m 3 rely, •B. 16 mo lens, aeeol, and; C•l. 17 gee liters1 ae•ol.i"

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Page 40

Figure 2. OH-6A Wind Tunnel Installation -Right-Front View

.44" 1

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S I -I

, HUGHES TOOL COMPANY-AIRCRAFT DIVISION 369-A-8eoANALSI .,MODEL REPORT NO. PAGE 42

SJPARED S Aerodynamic Tests of an Operational OH-6AcHEcKco my- 8, V. T, I Salicopter in the Ames 40' x 80' Wind Tunnel

i~i

T

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V.L. 83.00

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TIME HISTORIES OF ROTOR LOADS

Ames Wind Tunnel Data, I= 0. 349, CT/a s 0. 0843

.. .. .. . .. .. . ............................. Flight Test Data, L = 0. 344, CT/(T 0. 0894

Main Rotor Pitch Link Load6040 . /'I\ /

-4;0 .. .. "' 1

Main Rotor Blade - 17% Chordwise Bending5000

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11LU-Aij 1k%.epurt No. 531j-A-bU/,0 Page A-52

PITCHING MOMENT COEFFICIENT, Crl/c

(Tail Boom Support Strain Gage Balance Data)

RUN CONFIG. C/ RUN CONFIG. DATA CT RUN CONFIG. POINT S

2 FRBVHT 1 -3 .00161 9 FRBVH 16 -3 .002332 00202 17 .002073 i .00279 18 .002604 1 .00298 19 .002505 .- 8 .00339 20 .002826 00371 21 .00224

7 .:00408 22 .002788 -13 .00503 23 .000589 . .00439 24 .0031010 .00594 25 .00436

11 -3 .00208 26 .0024212 00255 27 .00231

13 1 .00270 28 .0021314 -13 .00630 29 .0025015 I 0061916 (00633 10 FRBVH 1 -3 .0021917 .00779 2 .0019418 -8 .00424 3 .0039819 .00545 4 .0019820 .00433 5 .0035721 .00362 6 .00581

7 -. 000093 FRBVHT 1 0 -. 00061 8 -. 00052

2 0 -. 00075 9 .001873 -3 .00132 10 .001154 00155. 1 . 000705 .00202 1z .002046 .00236 13 .002537 -8 . 00370 14 -3 .002038 | .00433 15 -1 .001399 .00485 16 -5 .0023910 .00551 17 -7 .0029511 -12 .00630 18 -9 .0049012 00693 :9 .00550

13 t .00755 I0.0050721 .00424

9 FRBVH 1 0 .00050 22 .003812 -9 .00447 23 .004613 .00422 24 .004424 .00368 25 .004685 . 00448 26 . 004806 .00495 27 .00495

7 .00425 28 .00451

8 .00449 29 .00671

9 .00441 30 .00899

10 .004/aP 31 .0040611 .004&7 t A ai - 32 0042912 -9 00429 ''v a C 0040913 -7 .00414 . 0045814 -5 .00449 . 0049915 -11 .00432 36 .00524

(continued next 37 . ,ý ?column) (continued next page)

[ %±0-%i.i tpurz 1*o. 401-A-duzu Page A-53

PITCHING MOMENT COEFFICIENT, C11/-1c

(Tail Boom Support Strain Gage Balance Data)RUN CONFIG. / RUN CONFIG. DATA C /a

RN .POINT S m POINT s

10 38 -7 .00418 12 FRBV1H 1 -3.3 .0011839 - .0522 1 00157

40 -11 .00422 3 .0016941 -9 .00447 4 .00176

5 .0020811 FRBVH -8.3 .00423 61 00206

2 .00534 7 .001503 .00768 8 .001474 .00293 9 -3.3 .002335 .00107 10 -1 .002876 .00412 11 -5.3 .001657 .00402 12 -6.3 .001598 .00414 13 -3.3 .002249 .00402

v 10 ,. 00432 13 FRBVH 1 -3 .0021311 .00411 2 .002101z .00221 3 .0042713 .00030 4 .0010914 .00690 5 .00007

s15 .00953 6 .0022316 .00387 ? .0003717 .00349 8 -. 0010818 .00149 9 .0031319 .00432 10 .0051320 .00493 11 .0018321 -8.3 .00424 12 .0014922 -6 .00451 13 .0012423 -3.8 .00573 14 .00224

24 -8.3 . 00416 15 .0026225 -2.6 .00185 16 -3 ,0023226 / 00446 17 0 .0021727 .00306 18 -5 .00226

L 28 .00152 19 -7 .0022029 -3 -. 00044 20 -9 .00244

I.30 .00074 21 .0051331 .00198 22 .00539

32 .00343 23 .00353

33 .00498 24 .00235

34 .00686 25 .0036935 .00221 26 .0024436 .00362 27 .0008037 .00055 28 .0057838 -. 00016 29 .0077339 .00197 30 .0042640 .0011041 .0004742 . 0022943 .00275

44 -3 00194

nVi..-AUi Auport rio. 50-A-dUZQ~ I-age A.54

PITCHING MOMENT COEFFICIENT, Ct/oj

.(Tail Boom Support Strain Gage Balance Data)

RUN CONFIG. DATA C Cm/r RUN CONFIG. DATA CPOINT S m POINT S m

14 FRBV 1 -3 -. 00239 15 FRB 1 -3 -. 001032 -5 .00281 2 -3 -. 00165

-3 -7 -. 00332 3 -4 -. 002314 0 -. 00124 45 -3 -. 00139 5 -1.8 -. 001086 r3 -.00182 6 -0.8 .000367 -3 .00023 7 -2.6 -. 001878 -9 -. 00160 8 -3.5 -. 00267i• 9 -11 -.00234 9 -1 -. 0002010 -7 -. 00117 1 -. 0211 -6 -. 00074 16 FRB 1 0 ---12 -9 '.00168 213 -9 -.00286 3 A14 -11 -. o00371 415 -7 -. 061875 -2.6 -. 0022616 -5 r..00068 6 -3.3 -. 0026117 -9 -. 00282 7 -1.5 -. 0010418 -3 -. 00128 8 -4 -. 0034519 -5 -. 00226 9 -4 -. 0030720 -7 -. 00316 10 -6 -. 0045221 -1 -. 00057 11 -2.6 -. 0018422 -3 -. 0014523 -. 00224 17 FRB 1 0 ---24 -. 00021 2 -3 ---25 -. 00408 3 0024426 -3 .00158 4 -.0030027 -4 -. 00229- -. 0032128 -2 -. 00074 6 -. 0018529 -6 -. 00368 7 0010530 -4 -,00230 8 -. 0025431 -. 0028732

3 .00298 18 FRB 1 0 -. 0007334 -. 00481 2 0 -. 0006035 -8.7 -. 00488 3 -4.5 -. 0042836 -10. 4 -. 00591 4 -4.5 -. 0040537 -6.4 -. 00354 5 -6. Z -. 0045038 -4 -. 00257 6 -7 -. 0046939 00-.o14440 0003141 -4 .0030442 -3 -. 0024843 I -0051744 +. 0004945 -. 00231

- -.- .. ..* . .

1 I III -

HTC-AD Report No. 369-A-8020 Page A-55

PITCHING MOMENT COEFFICIENT, Cm/a and Cm*

(Tail Boom Support Strain Gage Balance Data)

RU ONI.DATA DATARU CNFG.POINT ~S C/Ma RUN CONFIG. POINT S Crn

19 FR 1 0 -.00047 20 FRV 1 -3 .01772 -3 -00079 2 -5 -03523 -6 -. 00150 3 -10 -.05754 -8 -00155 4 -7 -. 0447Si5 -10 -. 00191 5 -5 -. 03456 -12 -00209 6 -3 -02237 -13 -00223 7 0 -.00648 0 -00013 8 3 .01419 0 .00061 9 -13 -.060010 -3 .0 0175 10 -11 -059711 -5.3 -00272 11 -9 -.044912 -8.4 .00367 12 -7 -.037913 -10 -00423 13 -5 -.029914 0 -00065 14 -3 -u16915 0 -00094 15 0 -002916 -2.6 -00252 16 3 .019117 -5. 7 -. 0039318 -8.2 -00513 21 FRVH 1 3 -.083419 -10 -. 00576 2 0 -.054720 0 -00056 3 -3 -034921 0 -00078 4 -5 -.0194

5 -7 -00066 -9 .02517 -11 .05318 -13 .0761

9 3 .072510 0 .052811 -3 -. 0379

-5 -5 022813 -7 -.06314 -10 .0264

HuGI4E TooL. COMPANY-AIRCRAFT DIVISMo 369-A-3020DEL REPORT NO. PAGE51

rNALYSI iis a

Mwe mein roo safour-bladed, fully articulated system havin~g a load-

lag hinge located 16.19 Inches from the CL~ of rotation and a flapping and

feethering hinge located 5.50 inches from the rkof rotation. Centrifugal

fore* to transmitted from the blade through the lead- log hinge to the out-

boasd end of a pack of thin stainless steel straps and is reacted by the cen-

trifugal ferce of the opposite blade, so that the hub is not relied an to carry

the centrifugal fore*. The inherent flexibility of the laminated strap peeks

permits flapping and pitching motions to be aoccdmated by stmuctural deforms-

tumrns. fts flapping and feathering hinge serves primerily as an qlipsit

(j point; a self-lubricated spherical bearing free to slide on a pin proides

fre~edm for all angular notions and permits elongation of the straps due to

centrifugal forces

The straps we of high strength stainless steel strips with taflon

sheats between the laminations to prevent fretting. The hub is a premium

strength alumimn alloy cotig, smonted on tapered roller bearing@ Wbich

transmit throst and hub moiants to the mast. A six-inch radius curved

surface (shoe) is provided to permit vrapping of the straps due to ftipping

and pitching motions.

The blade is a composite structure consisting of: 2024-T4 alumainum

extruded spars* 2024-T3 aluminumi skin, 2024-T3 aluminum channel, 2024-13

aluminum strip, and extruded braom weight at the leading edge. All these

parts are bonded together. At tha blade tip, a bronxe weight is bonded and

riveted to the blade. At the root of the blade, the upper and lower root

fittings are banded and bolted to the blade. At this location, the blade

HuGHES TOOm CAMPANY.AIRCRAFT DIVISION 369-A.8o2o P' NAylMMODE L REPORT No, PAGEi 5-

AMNAMYIS IY, •'n mi tests of an op~ertioal O-G

CHECKED 9y V. y* Naltaipter in the Amo 401 1 80' vied Tmnel

base reinforcement f~row the 2024-T3 aluminum doublers A 2014-26 aluminum

forging is attached to the rost of the blade for takiug the doger am bed.

Mhe blade bea -8e twist and no taper. Figueo Wl5 presents significnt blade

di etn ams, the flprise inertia, and the cbhrdvi inertia.

The blade hea an N&CA 0015 airfoil sNation of 6.83 Inch chord. With

the traTlmng edge ezteunlon the overall chord to 7.21 Inches. Figures D.2,

-3, -4 present the opeavise dist•eibution of wtGiht, choridvise e.. location,

and chordftNs mamnt. Table 3-1 presents a summary of the Rotor Xmai

p"Oparttese.

The main roter hub controls are illuetreted In Fig. 53-. C•ycli end

solleetite pitch notions of the rotating aoshplaee are carried to the integral

boma on the pitch housings by short links with rod end bearing@. The

rotating suesbplato is driven by links fastened to the hub. The rotating

oashplate is connected to the non-rotating ehsbplsto through a double

row bell bearing. The outer race of this bearing is a pert of the rotating

ubVsplete; the inner race is a part of the non-rotating sudhplote. The non-

rotating seshplats tilts on a self-lubricated bearing surface mvingt

against a hard sorfece on the main rotor lost. Rotation of the non-rotating

weshplate is prevented by one of the links that transmit conteol motion

from the mixer assembly.

i4

!uGHEs TOOL COMPANY-AIRCRAFT DivisION 369-A-8020

MODEL REPORT NO. PAcE B-3AN•ALYSIS,P*PAJ BY R. IcaLtert Arodynawic Tests ef an Operation1 lH-6ACHCKEo g 5. V. Jl eHe-licopter in the Amos 401 1 80' Wind Tvmae

TAUK 3- 1

IUBARY - RCTR0 MASS P3.tg

RENWAUX LEAD- AG FLAUTING

U113I Lbs. 26.96 28.61 37.25

oEMr or GAVITYPitch Axis (.25C) In. 0.03 0.04 0.21Loading Edge In. 11.74 1.75 1.91Ce•ter Line of Rotation In. 80.53 76.85 61.74Vfrst Mment Lb.-In. 2171 2199 2300

NONT Of MEMAcr ABOUTr

Center 1-1 iotat & .25C Lb-In.Sq. 239883. 241256.S1-1t.8q. 51.78 52.07

lo-L Hinge & .25C b-In.Sq. -176192.(Sts 16.19) 81-Ft.sq. 38.03

Flop Hinge & .25C Lb-In.Sq. 217083.($t1 5.50) $l-Ft.sq. 46.84

Pitch Axis (.25C) Lb-In.Sq. 9q.72 173.33S1-Ft.Sq. .0215 .0374

7lap~ping 1b- In. Sq. 64529. 70865. 99162.$1-1t. Sq. 13.93 15.30 21.40

]riteting Lb-In.Sq. 94.42 98.24 170.6331-l•.sq&, .0204 .0212 .0368

Load-Lag Lb-In.Sq. 64582. 70919. "269.S1-Pt.Sq. 13.94 15.31 21.43

PRODUCT OF INERTIAAbout Center of Rotat Lb-In.Sq. -73. -65. 10.& .25 Chord wLL 1735

ITE14 WEIH L .ZC-I O

ROTAT'IG HUB & RETENTION ITEMS 29.00 464.FRA4 HUB CENTER LINE TO FLAP HINGE

1Z - W(R SQs), R - 4.00 IN

1Z - 29.00 ( 16.00) - 464. Lb-In Sq

Y. FLAPPING BLA2'S 149.01 965025.WT - 37.25 X 4. - 149.01 LbsIZ - 241256. X 4. - 965025. Lb-In Sqd

TOTAL ROTOR GROUP 178.01 965489.(208.39 SI-Ft Sq)

Wnizht Ybtýun of Inertia About Rotor Centerlir~e B• ~Best Available; C o r

Hum= ToOm COMPANY-AIRCRAFr DivisIO 369.A-8o2oANALYSW M EEPORT NO. PAGE '-4

PREPARED mV 1. Is st*rt Aerodynamic Tesct of an Operational OI-6AtMCKIDU my 8. V.a. _Helicopter In the Amos 40' X 80' Wind Tume

.17.19

1 19.19

~~.i- 23.62 .3737 5.570

26.19 .177 53)60

"- 36.19 .1136 3.276

- 137.625

1 10. osX 10 lbm/1n2 1G3 -..

h~u16.1

TTT~~ ~ ~ L j. 1- -

7 r~-1~~ i

41 I 4

7.A.I ~ 1

S~t=¶~ r~ L ~ 1 1r

Lf

q . ............ I

4 .1JL*

L 4

-t -i , I

I

In

U U.

A .E A . 1

it .. d .

-I-

vlr~0

.. -__ _ _ _ _ .. .

to.1 4 . .. 4 I Q . --. I

i..i

---- 4 --4 --1" 1t -I-6 -L.--V -r-

4, -4 7 -T .

-- II~7,71-7717I

if RTC-AD Repoit No. 36--82 page B-8

0


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