Antique FlyerIssue 156August 1995I AMA CHAPTER #108

IJuly Chapter Meeting

By John Carlson

Vacation time resulted in a relatively lightattendance of only 23. However a goodand lively meeting was enjoyed (I think)by all. Visitors included Tim Eriksen andson David from Novato and invited byPrez Rod after meeting them during avisit to Hangar One. Hope to see youagain soon. Also Stu Bennett, well knownto many, an Oakland Cloud Duster andactive SAM F/F'er, came with BillVanderbeek. These guys never comeempty handed but always bring reallynice prizes for the Raffle. Thanks againto you both. Another attendee we had notseen for some time was member Janina

Robinson who sadly informed us thatcircumstances made it necessary to .return to British Columbia for at least the

immediate future. Those presentexpressed their disappointment at thisnews and all wished Janina well, with the

hope she would soon return. Maybe shecan find her way clear to attend the Crash& Bash in October. We hope so!

ANNOUNCEMENTS

Prez Rod Persons presented a Certificateof appreciation to Remo Galeazzi for hishosting last month's meeting and hispresentation on the restoration of theRose Parakeet aircraft. Another

Certificate was presented to Don Bekinsfor his discussion on the use of Polyspancovering.

John Carlson advised that the lease withthe Novato Fire Protection District for the

use of our meeting room has beenrenewed for another year.

John also advised that the Napa R/CClub flying field at Kennedy Park is indanger of being shut down as a result ofcomplaints from residents in thedevelopment across the river.

Stu Bennett announced that the US/West

Team had won the postal meet for the

Chardonnay Cup sponsored by theAustralian F/F'ers. Entries were fromAustralia, New Zealand, US/ West andUS/East (and maybe Canada), all formerBritish colonies, resulting in the alternatename of FOCKUP for the contest. The

model flown was the FAI Coupe. Highscorer was Bob White. The prize was abottle of Chardonnay, all of the entrycountries being producers of that product.

OLD BUSINESS

Polys panThe Polyspan is selling well. Maybe toowell. As of 7/26 we have sold all butabout

15 ft, leaving less than 25 ft of the original50 m. (164'). We had to limit sales toSAM 27 members only, which resulted inrefusing Jim Adams, of all people. SorryJim!! DOA BekiAs is trying -(e find anothersource for the material. To avoid

potential problems with Starline whohave, or are, trade marking the namePolyspan, we are seeking another name.PolySAM and SAMspan have beensuggested. Any further suggestions?

Carbon Fiber Tow

The June 1995 Antique Flyer containedan offer of FREE carbon fiber tow to

anyone sending a SSAE. Well, thingsjust got easier - Fred Terzian brought andpresented to SAM 27 a large spool of thematerial. The quantity is unknown but itlooks like a lot. The Club will have the

spool available at future meetings andany reasonable quantity will be given toattendees. Quite a few took advantage ofthe offer that evening without making anobservable dent in the quantity. The towis about .006" thick, 1/4" wide, withparallel, non-woven strands and makesideal reinforcement to structural members

in tension, such as the bottom of a spar,when attached with CA or epoxy.

SAM Rules BallotingDon Bekins reminded members that the

July-August SAM SPEAKS contains theballot form for the proposed 1995 ruleschanges and urge everyone to send intheir vote without delay. Don also

advised that Bruce Augustus will bereplacing Bill Kimbell as Editor of SAMSPEAKS.

SAM CHAMPS

During his recent visit to Colorado, DonBekins, with Art Hillis, toured the contest

site. Don Reports every thing is lookinggood but advised that any with Trexlerwheels on their model should change to afoam or solid tired wheel. It seems there

is a fairly small, low growing cactus atscattered locations, the spines of whichare deadly to the thin Trexler tires but noproblem to shoe soles or bike tires. Thepreviously reported lone tree in theseveral square mile site is recognized asbeing a magnet for F/F models andtherefore a special prize (or prizes?) willbe awarded for landing in the tree. Donalso reported that plywood sheets wouldbe provided for model takeoff.

OfT Rubber Meet

Jerry Rocha reported that the parkingarea had been mowed to reduce the firehazard and would be marked with tape.

Jerry, Dick O'Brien and Bob Wakerley didthe mowing job. Thanks guys!! A briefreport and contest results appearelsewhere herein.

1/2 A Texaco Scale Postal Meet

SAM 27's team for this was hastily pulledtogether by telephone and during theMECA Collecto, and arranged to be flownon Sunday, July 16. Ed Hamler wasaway in Alaska so Jerry Rocha did theCD honors. The weather was ideal, warm

with a light breeze and pretty goodthermal action as the day progressed.Results were as follows:

Ray Me Gowan Messerschmitt M-171679 sec.

Jerry Rocha AVRO 5601537 sec.

Pete Samuelsen J-3 Cub494 sec.

Team Total 3710 sec.

Also flying, but not very well, was JohnCarlson with his Anzani Longster. Withmuch encouragement from Bob Wakerleyand after several crashes, two official

Page 1

August 1995

flights were posted but not enough to makethe team. John announced he needs the

radio and servos for another, morecontrollable model and retired the Longster

to the attic, or ceiling, or something.

MECA

Collecto Rod Persons reported on theCollecto held on Saturday, July 15 in thegym at the Napa Redwood Middle School.In spite of the HOT weather, there was agood turnout and many bargains for thosewho knew value and looked carefully. EdSolen berger reported an amazingcoincidence. For sale on one of the tables

was the, (not a, but THE) Miss Americamodel that Ed had built in 1962 and later

sold or traded. It was in perfect shape withthe original 33 year old silk covering. Themodel was purchased at the Collecto byEnglishman Mike Clansford, author of the"Model Engines A to Z" book. The nextCollecto will be held at Oakland in the fall.

Technical Presentations Rod Persons

again asked for suggestions for futuretechnical presentations. Rod offered toline up a speaker, all he needs is topicsuggestions. Come on Guys - lets thinkabout it. These are your meetings.

Crash & Bash We had expected LorenSchmidt, our C&B host, to attend themeeting but for some reason he didn'tshow. Perhaps he remembered, thatunlike his SAM 30 pals, the SAM 27 wimpsseldom serve any food at their meetings.Anyway, Rod Persons reported that thingswere in hand. Don Bekins and Ed Hamler

would be mailing out a flyer very soon.The events will be the same as last year.After the meet a review of entries will be

made to possibly eliminate or combinesome events in 1996. Rocco Ferrario has

the balsa prize and the food situationarranged. Joe Meere is working on theRaffle prizes - anyone with anything todonate please contact Joe.

0& R T-Shirts

T-shirt sales have been very slow due tothe lack of a vigorous marketing effort.Don Bekins thinks we can sell most of

them at the SAM CHAMPS, particularly ifwe have them available at the SundayCollecto. Arrangements need to be madeto locate the shirts, transport to theCHAMPS and display them at the Collecto.

More discussion on this next meeting.

NEW BUSINESS

We apparently covered any potential NewBusiness items under Old Business so we

proceeded to the Technical presentation.

TECHNICALPRESENTATION

Nick Sanford had been scheduled to

discuss the fabrication of fiberglass partsbut he recruited Ed Solen berger tosubstitute for him. Ed gave a veryinteresting talk and demonstration usingthe plug and molds he had used toproduce a fiberglass engine cowling. Theplug is a male mold that could be carvedfrom some soft wood in the exact size and

shape of the desired finished product. Edused redwood. The plug was made in twohalVes-temporarily joined during thecarving process and carefully finished sothe surface is as smooth as is desired for

the finished fiberglass part. A couple ofcoats of varnish or similar coating seals thewood prior to applying a parting agentwhich may be something like shoe polishor a commercial product. The two halvesare separated and placed on a flat surfaceto which the parting agent is also applied.Next, female molds are made of each halfby taking some ordinary construction type(pink) fiberglass insulation mat andsaturating with an epoxy resin. Edrecommends the 45 minuJe Hobby Poxymade by Pettitt for both the female moldand for laying up the finished part. He hashad much better results with the epoxythan with polyester resin. The saturatedpink fiberglass mat is firmly pressed downover each plug half. Ed uses his barehands and says a prompt washing in warmwater and soap does the trick. Becausesome may experience skin irritation or anallergic reaction from contact with theepoxy, the use of disposable latex glovesmay be desirable. The mold should bemade sufficiently thick so as not to distortduring subsequent operations. The insideof each mold half is coated with partingagent, another batch of epoxy mixed andthe final part made by laying in layers offiberglass cloth or matting of adequate

Page 2

thickness well impregnated with the

epoxy .. After setting up, the two halves areremoved, carefully trimmed and joinedusing strips of fiberglass cloth set in epoxyon the inside of the seam. The finished

product should now be of identical size andsurface finish of the original plug. Ed

passed around examples of the plug, mold,and the completed cowling. Thanks Ed - agreat job.

SHOW & TELL

Don Bekins displayed a framed Ramrodmodel he hopes to finish for the SAMCHAMPS Class C event. This model has

about a jillion ribs which Don made fromstacking sheets, band sawing and sandingto final shape. The spars are reinforcedwith carbon fiber. Power will be a

Johnson 35 recently acquired from BillVanderbeek. Looks like another winner.

Ed Solen berger showed" mufflerextension now on the market and made byDubro. It replaces the back end ofstandard mufflers and due to its conical

shape and concentric ribs matches up witha wide range of sizes. The interior of theextension contains a number of parallelsilicone tubes. Tubes may be removed oradded depending on the degree of noiseattenuation desired and to optimize engineperformance. Ed reports a very significantnoise reduction by it's use.

Nick Sanford brought a completely framedstabilizer utilizing laminated Obechi woodleading and trailing edges and tips. Eachlamination is about 1/20" thick and 5 or 6are sufficient. The end of a stack of

laminations is secured with a drop of thinCA and the strips bent dry around a formor the structure. After it is place, a fewshots of thin CA along its length holds itsshape. Anyone interested could checkwith Nick or Park Abbott regarding asource for the Obichi sheet.

Bill Kast displayed a beautifullyconstructed, scratch built, completed scalemodel of a Citabria Pro, a rare, parasol,open cockpit version of the normally cabintype aircraft. Bill built the model severalyears ago but never gofaround to flying it.It is complete with servos, less radio andengine and is finished in a beautiful redand white starburst patter;): Bil! cffered the

Antique FlyerAugust 1995

PRIZE DONORWINNER

Mini Max Kit

Bill VanderbeekRod Persons

Rubber Kit

""Brian Ramsey

R/C Glider

Stu BennettRon Keil

DH-4

John HlebcarRick Madden

Prop Balancer

?Ron Keil

Control Rod

SAM 27Ed Solen berger

Tubing Bender

SAM 27Bill Vanderbeek

Decals

SAM 27Rick Madden

Fuel Cut Off

SAM 27Bill Vanderbeek

Miter Rite

SAM 27Rod Persons

Accelerator

SAM 27Nick Sanford

Fuel Bulb

SAM 27Bill Vanderbeek

Engine Mounts

Rod PersonsJohn Carlson

Total Collected

$68.00

NEW MEMBER

John Hlebcar Photo

Bill Hurley's Triplane is covered with 1939tissue. Built from a Megow Dime Scale Kit.Bill won 2nd place in the Small RubberEvent, July 22. Modelflew O.S.S. and hasnot yet been found.

Right:Jerry Rocha'sZephyr, Sal TaibiDesign..020 Cox power,1/4 A Nostalgia

Page 3

~~r• YOU GOMM" "TRV"TO flY

~?'

Wes Funk notes that anyone needing a 1/2oz. fuel tank for 1/2 A TexacQ Free flight or

A Texaco R/C has found a supply. Theyare listed in the Carolina-Taffinder

brochure, as Texaco Tanks. Several areavailable with outlets in different locations.There address is:

Carolina- Taffinder8345 Delhi Road

Charleston Hgts., SC 29418803-553-7169

We wish to welcome Dan Carpenter ofManhattan Beach, CA to SAM 27. BuzzPassarino had mailed a couple ofcopies of our newsletter to Dan whothought itwas so great he had to join. Dan saysthat Buzz taught him how to fly his firstWesterner back in 1945. He justrecently joined SAM 13, SCAMPS.

model to the club with the suggestion thatsome sort of raffle could raise money forthe' Jr. Off Program. Brian Ramseysuggested a silent auction to be publicizedamong some of the other clubs in the area.It was also suggested that an engine andradio be provided to make the packagecomplete and more attractive. Brianvolunteered to take on this project. ThanksBill and Brian!!!

Ron Keil produced a Cox 3-channel radiodonated from the estate of our late member

Tom Brennan, It was suggested that this,in some way, be used to further the Jr. OffProgram. Ron also unrolled plans todisplay what Ron termed as the ugliestmodel design he had ever seen. Some ofthe others thought the adjective should be"very strange" instead of "ugly". In anycase it is hoped that Ron will show up atone of our future meetings with the finishedproduct. The model is a Col. Boude(?)design named the Kanga Kub. Thelanding gear spread is 18". It has a goodunder cambered airfoil and a largestabilizer. If and when Ron builds it he willuse it in the R/C Class A Texaco event.

Rod Persons showed his completed TopBanana 1/4 A Nostalgia model. Thecovering is Polyspan featuring Rod'strademark red and green color scheme andcomputer generated graphics. The deepgreen coloring used aniline dye purchasedfrom the Constantine's (NY) mail orderhouse. The dye was mixed in a 95%-5%thinner/dope mixture sprayed on thecovered and doped model. A very little bitof the dye goes a long way. A beautifuland well constructed model. On the

subject of dye, Ed Solen berger suggestedconsideration of a dye available at NewYork Fabrics stores in powder form. Edsays this product should be mixed inmethanol before adding to a dope/thinner'mixture.

RAFFLE

Don Bekins brought for the Club'spurchase as raffle prizes a dozen of theservo actuated fuel shut off valves

manufactured by Classic Off Engines ofPerrysburg, OH (see adv. in SAM Speaks).These sell for about $12 ea. includingshipping. The Club paid $85 for the dozen,a good deal.

...--..-- ...••

FlyerAugust 1995

Left: New SAM SpeaksEditor, Bruce Agustuswith a Mc Coy 60 powerdSailplane at the '93 SAMChamps.Bruce lives in Hailey,Idaho.

Right: Zeek, Class A

Nostalgia Free flight.Would make an excellentchoice for the Small Nos.RlC event.

Wes Funk Photos

ContestsThe July meet at the Lakeville site was ac­tually held over a two weekend period. The

_. wind came up early on the 220d aDd most­events were postponed until the 29th. Agood sized group was on hand with theremodels on the 22nd. Most of the models

sat in the cars and the flyers visiting witheach other until about noon when theycalled it a day.

The results of the meet on the 29th are.

Hand Launch Glider/Catapult 2 min.

Norm Smith 3:09

2 Bernard Guest 2:36

3 John Hlebcar 2:26

OT Large Rubber 3 min.

Jerry Rocha 8:34

2 Bill Hurley 1:53

3 Sean Crowley 4:42

OT Small Rubber 3 min.

Bill Kast 3:06

2 John Hlebcar 4:22

3 John Allen 1:46

.020 Replica & Nostalgia :90 sec.

Jerry Rocha 4:24

2 John Hlebcar 4:22

3 Rod Persons 3:58

SAM 34/ SAM 51 Contest held at Carson

City, NV. August 5th and 6th under a warmsun and moderate breezes.

28 Flyers had 10 events to choose and fly.i;Vith an outstanding field to fly froman-dgreat prizes, (kits,engines and wing weighthold downs) made for a good weekend.

Don Bekins and Wes Funk, representingSAM 27 came away with 3 First, 2 Second,and 1 Third place awards.

Don winning 1st in A ign.,and Ohlsson /Brown Jr. ,2nd in B / C ign., and 3rd in AGlo LER.

Wes took first in Electric Texaco and 2ndin A Texaco.

Below Left:

Sean Crowley receives trophy fromRod Persons at the Lakeville Contest.

Below Right:Nick Sanford shows use of Obechiwood on stab outline.

John Hlebcar Photos

Flyer

.,----.. .

August 1995

Left:

Bill Hurley with Triplanethat was lost O.O.S. after

this picture was taken.John Hlebcar Photo

Right:John Hlebcar with with

.020 nostalgia FUBAR.

Left:

JerryRocha with a 1955Paddy's Wagon, Wasp.049 power.

Right:Jerry, with .020 nostalgiaZephyr, designed andautographed by Sal Taibi

Left:Rod Persons with .020

nostalgia Top Banana.Jerry Rocha Photos

Right:Don Bekins recieves cer­

tificate for technical pre­sentation.

John Hlebcar Photo

Page 5

Flyer

James Terry with Staitduster-XJohn Hlebcar Photo

FREE WHEELERS

Paul Mcilrath

A large, wide-blade propeller is the trade­mark of a high climbing rubber poweredmodel. But the big fan that is so efficientunder power, is nothing but a big DRAGwhen the motor is unwound.

To get rid of this drag, some smart JuniorBirdman invented a gadget that let his pro­peller windmill freely after the power ranout. The idea took the name "Free­wheeling" from a similar device that waspopular on the automobiles of the day. Andfree-wheeling so improved the glide ofthose early planes that record books wererewrit ten.

No special tools are required to buildmost types of free-wheeler, but a good pairof pliers IS necessary. Long nose pliers arethe handiest for wire bending. The minia­ture sizes are rugged enough for wire sizesof 1/32 or 3/64 inch diameter. Good qualitydiagonal cutters will cut hard steel musicwire; cheap ones won't. Several shapes ofnoses are made specially for wire bending,but thousands of fine models have been

built with nothing fancier than old-faithfulmechanic's pliers. It is mportant, though,that your pliers have a solid, tight jointat the hinge pin. If they twist and slip, you'llend up with nothing but crooked parts anda long list of bad words.

August 1995-------Use a small file for cutting and smoothing

wire and metal parts. Wire and tubing canbe broken after notching with the files. Alu­minum tubing can be cut with a modelmaker's knife, but a fine razor saw or hacksaw is necessary' for cutting brass tubingand sheet metal.

Most of the materials illustrated are avail­

able from Sig or from your hobby shop.Glass beads can often be substituted for

washers or eyelets. Beads are used inhandicraft projects and are available athobby shops, and dime or departmentstores. Of course, you can always buy aWoolworth "diamond" necklace and un­

string it. Eyelets (used by the radio controlbuilders) and small washers are availableat some hobby shops and mail orderhouses. Good springs can be found in dis­carded tire valves, ball point pens, andsafety pins.

White glue or airplane cement is needed,but stronger wood-to-metal joints can bemade with epoxy glue. Epoxy will evenstick metal-to-metal if it is used properly,(clean and rough-up parts before joining).

We have shown several styles of free­wheelers on our page of sketches. Thesimple cam idea, Figure-I, copied from theplastic props, works quite well if the tensionof the unwound rubber is not too great. But,unless there is SOME rubber tension, thepropeller won't stay locked to the shaftwhen you try to hand-wind. In this situation,a winding hook, Figure-2 is helpful even ifyou aren't using a winder. Just slide adowel thru the hook and "wind the

dowel" until enough tension is built up tolock the shaft to the prop.The latch made of control line wire,

Figure- 3, is an improvement over a cambecause it doesn't depend on rubber ten­sion and can be made more frictionless.We'll discuss friction later. There are twodetails to watch in a latch free-wheeler.

The latch wire must be long and springyenough to bend inward (lock) and springout (release) without bending permanently.Also, the latch wire must meet the arm of

the shaft at about a right angle or it will slipoff when the motor is fully wound. That isabout as pleasant as ho Idi ng 10, 000volts in your bare fee t .A widely used free-wheeler is the "contest

standard", Figure-4. This spring operatedarrangement is similar to the one used onfolding propellers. When the motor isnearly unwound, the spring slides the shaftforward, the prop is released, and the shaft

Page 6

is locked against the screw in the nose­block. Locking the shaft prevents the rub­ber slack and sliding backward or forwardin the fuselage. A long, slack motor cancompletely destroy a model's balance inthe glide unless it is tensioned.

You're probably wondering what the extratubing and washers are for in our sketch.This is the frictionless feature that we men­

tioned earlier. Notice that the tubing insidethe propeller prevents the tension of themotor (or spring) from squeezing the pro­peller. The prop is completely free of bindor drag. If you want the very best free­wheeling glide, use this no -drag feature. Itcan be used with any style free-wheelerexcept the cams .The last two gadgets in our collection

Figure-5, have the advantage that theydon't have to be engaged by hand. Theywill lock by themselves whether you windby hand or with a winder. The free-swingerlocks when the airplane is tipped nosedown during winding.

The escapement is automatic self lock­ing, Figure-5, however it puts some dragon the propeller while freewheeling, andthe flip-flop part should be kept light andfree turning.

Your choice of free-wheeler style will de­pend on the airplane type, your windinghabits, and the available tools and materi­

als. Many variations and combinations offeatures are possible. Try some of themechanisms shown here first. Then invent

an original design, suited to your tools andmaterials, and your own free-wheelerneeds.

Jerry Rocha's "Purple People Eater"Elfin 2.49 powerd Coronet

Wes Funk Photo

THREAO

oCONTROL

WIRE

FOR THAT- /~ ~, A'" I ~\'

GLIDE

August 1995

TUBING

MUSICWIRE

BEAOS

WASHEnS

EYELETS

SPRINGS

TOOLS 6 MA TER/ALS

Flyer

PLIERS: LONG NOSE

OIAGONAL$

OLD FAITH­FUL

••••••

"PLASTICS"USE THI8CAM.

THESIMPLEST!

CAMS CAN BE HOM£MAO£ FROM:

TiJ8ING, SHEET METAL.

OR EVEN ASPLIT-LOCKWASHER.

?= THI8 HOOK

LOOKSNEATEST,

8I/T--

+THI8 KIND

18EASIER TO

® BEND.

EITHER

SPRING

WILLWORK.

ANO LOCKn THE1: MOTOR.I,

tl

THE "CONTEST STANDARD"I/SES A .sPRING TO

iJNLOCK I'

h'b~ P ,\,'" rIIIII'

HOOKSLIKEA

SCREEN DOOR.

A FINE WIRELATCH

A SWING-FREELATCH WILLLOCK BYGRAVITY;

AN ESCAPEMENTIS

®

POSITIVESELF­

LOCKING.

SELF-LOCKING TYPESCAN BE(fSED

ENCLOSEO IN ASPINNER.

Page 7

FlyerCarving Your First Propeller

Paul Mcilrath

A good propeller is a necessary part of asuccessful flying model. Plastic props areOK to begin with, but usually flights will behigher and longer if a hand carvedbalsa propeller is used.

If you have a model of about 15 to 22inch span, try the 6 incher shown here. Itmay improve the performance of yourplane, and carving it yours elf will be goodpractice for the time when you go on tocontest models.

Instructions are also given at the end ofthe article for enlarging the pattern to 7-1/2inch diameter. That size would do a goodjob on models like the Sig Cub in the Julyissue of SAMM.

Now to get started making your first prop.1) A firm balsa block 6 x 1 x 3/4 or a little

larger is required. Cut out the &11 size pat­tern, crease it on the dash line, and cementit to the front and side of the block.

Next, the hole must be drilled for the

shaft. Use great care to get the holestraight in the block-- not at an angle, oryour prop will wobble as it turns.

If a drill press is available to you, use it todrill the shaft hole or have someone do it

for you. That will guarantee a true hole.Now the block can be cut to outline

shape. It is an easier job on an electric jigsaw or band saw, but it can be done with ahand coping saw.

First cut out the side view but save the

scrap pieces. Pin all the scraps back inplace to make a square block again. Then

August 1995

cut the front view to shape, remove pins,throwaway the scraps, and you have acompleted blank--ready to carve.

2) The second step is whittling the rearfaces of the blades flat. If this is your firstcarved propeller, don't try to hollow theblades to a spoon-like shape.

Before you make your first cut, look at thedrawing of Step-2 carefully and keep aplastic prop on the bench in front of you tolook at from time to time. When caning,make small, thin shavings. Ihe knife bladewill be easier to control and you'll preventbig mistakes. Remember Whittier's Law: Itis easier to cut off 100 shavings than toput back one.Work a little on the back of one blade and

then the other; don't complete one bladebefore starting the second. Don't carve thecorners of the blank to a sharp edge; leavea small square margin around the edge asshown in the sketches of Step 2.

Complete Step-2 by sandpapering the flatblade faces smooth. Use a piece ofmedium sandpaper fastened around abroomstick or a bottle. The fine sanding willcome later.

3) Step-3 is easier than Step-2. It consistsof shaping the front surfaces of the bladesto the rounded shape shown in thesketches, using knife and sandpaper.Note that the blades are thick near the hub

and thinner at the tips.If this is your first try, don't attempt to get

the blades real thin. Thin blades will splitand chip easily when your plane hits treesand wires, anyway. Try to keep the bladesthe same thickness. After a little practice,you will become expert at finding thick

spots by feeling the blade thickness be­tween your thumb a'nd forefinger.

4) If you have done the first three stepscarefully, Step 4 is easy. Slide yourpropeller on a music wire fine enough sothat the prop will turn freely. One blade willprobably be heavier and swing to the bot­tom. Look for the thick area on the heavyblade and carve and sand away the ex­cess. Spin the prop again and see if theunbalance has been corrected.

When the baiance is perfect, the prop willstop in one position just as often as an­other. If the prop always stops horizontally,it still isn't right. That means that the trailingedge of one blade and the leading edge ofthe other blade are too thick. As the bal­

ancing progresses, change to finer sand­paper to smooth the blades. The carving ofyour first propeller is now complete. Itwasn't too tough, was it?

If you use filler or dope on the blades,check to be sure that you don't upset thebalance with more dope on one blade thanthe other. Bend a shaft and attach the propto the plane as shown on the plane's plans.

You will probably find that a thicker rubberband or more strands of rubber are needed

when you switch to a carved prop. Don'tworry. Rubber is your &el, and more fuelusually means longer flights.

You may want to enlarge our pattern to 7­1/2 inch diameter if your model's span is inthe range of 18 to 26 inches. Mark off a 7­1/2 x 2-3/16 piece of paper into 5/16 inchsquares and copy the pattern. You willneed a block 7-1/2 x 1-1/4 x 1 or larger.Carving, of course, is done in the sameway.

I -- --I t" SIDE"""

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I

Page 8

~~NEARTIP

CENTEROF

BLADE

NEARHUB

TOOLS AND MATERIALS

August 1995Flyer

1. CEMENT PATTERN.

TO BLOCK DRILL SHAFT I 2 CARVE REAR BLADEHOLE, AND SAW TO SHAPE SURFACES FLAT

'",," "~,.-..

~LSJNEAR CENTEROFHUB BLADE

.~tNEAR

TIP

\ ,3. CARVE AND SANDPAPER

FRONT SURFACES TO AIRFOIL L..:. BALANCE AND FINISH

Page 9

AMAChapter #108

OFFICERSPresident:

Rod Persons115 Kerry LaneCloverdale, Ca. 95425

Vice President:Tim Younggren240 Sun Court

Healdsberg, Ca. 95778Treasurer:

John Carlson353 Las Casitas Ct.

Sonoma, Ca. 95476Contest Director:

Ed Hamler

3379 Crystal CourtNapa, Ca. 94558

Official Photographer:John Hlebcar201 Foster Rd.

Napa, Ca. 94558Editor:

Wes FunkP.O. Box 8241

Truckee, Ca. 96162--, -

(707) 894-5788

(707) 433-9317

(707) 996-8820

(707) 255-3547

(707) 252-8482

(916) 587-2785

,,~

MembershipMembership is $15 for the calendar year. After February, the

dues for a new member will be prorated.

Due to increasing cost of publication and mailing, the AssociateMember category has been dropped.

Send dues to John Carlson, Treasurer. Make checks payable toSAM 27.

MeetingsMembership meetings are held on the third Wednesday of

each month at the Navato Fire Department, Training Room, onAtherton Ave. at 7:30 P.M.

PLEASE ADYISE EDITOR_OFANY CHANGE OF ADDRI;SS

. -"'- ....f\l~xt-meeting:Wednesday,August-16,1995· .. ·

7:30 P.M. at the Novato Fire Depa-rtmenl-:­Training Room

P.O.Box 8241 Truckee. Ca. 96162'~;'>'-

Antique

FlyerAugust 1995

Bill Kast donated his one of a kind Citabra to

the Junior Old Timer programJohn Hlebcar Photo