Ahead (ABM) Fuze System Folie 1 P2 16512 AA, P-VP/FD/41, © 2004 Oerlikon Contraves Pyrotec AG,...

Ahead (ABM) Fuze System

Folie 1 P2 16512 AA, P-VP/FD/41, © 2004 Oerlikon Contraves Pyrotec AG, Zürich/Switzerland

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Safety, Reliability & Performance Safety, Reliability & Performance of the Ahead (ABM) of the Ahead (ABM)

Programmable Fuze SystemProgrammable Fuze System

NDIA 39th Annual Gun & AmmunitionBaltimore, MD Apr. 13-16, 2004

Presented by: Allan Buckley

Director Product ManagementOerlikon Contraves Pyrotec AG

CH-8050 Zurich / Switzerlandwww.mauseroerlikon.com

[email protected]



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The AIR BURST TechnologyThe AIR BURST Technologyforfor

Medium Calibre AmmunitionMedium Calibre Ammunition



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Ahead (ABM) for Air Defense and Vehicle Armament

F2 15087 DE

Programmer

Payload Ejection

Target

Fire Control Unit

Fire Control Unit

ABM Electronics

ABM Electronics

Vo Measurement

Fuze

ProgrammingPayload: Subprojectile

ABM Projectile

Application IFV:Application IFV:



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Time Programmable Payload Electronic Fuze

Power EjectionSupply Charge Subprojectiles

Explosive Train (W-Alloy) (Squib, S&A, Deto)

Data ElectronicReceiver Timer ModuleCoil (ETM)

Ahead (ABM) KETFProjectile Concept Outline

F2 15024 BB

(Setback Generator)



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Ignition System / SquibIgnition System / Squib

Electronic Timer Module / ETMElectronic Timer Module / ETM 40F9211-1140F9211-11

Set-Back GeneratorSet-Back Generator

Ahead (ABM) Fuze Module

F2 15086 CE



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Axial Acceleration

Safety Criteria for Ahead (ABM) KETF Fuze

Ignition EnergyChemically Stored

ABM AHEAD KETF FUZE

PROGR.: DETONATION / SDPROGR.: DETONATION / SD

Ignition EnergyChemically Stored

Safe Lock 1Axial

Acceleration

Safe Lock 2Rotation

Safe Lock 1Axial

Acceleration

Safe Lock 2Rotation

DUDDUD

DETONATIONDETONATION

Rotation

Exterior Shock

Interior Ignition Trigger

StorageIgnition Energy

Completely InertIgnition Energy

Mechanically Stored

MECHANICAL FUZES

DUDDUD

DUDDUD SELF-DESTRUCTSELF-DESTRUCT

Ignition EnergyElectrically Stored

Electr. Muzzle Safety(embedded)

No Impact Sensor

F2 16516 A1



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Capacitors Loaded

Rupture Disc Punched (Set-Back Generator)

>10000 ms

Ahead (ABM) KETF Fuze:Life Cycle Events - Summary

0< 5 10 50 100 1000 10000 ms

8192 msBarrel Muzzle Area Operational Range

Muzzle 64 ms

Electronic Muzzle Safety

Self-Destruct

Electronics

Detonator In Armed PositionSAFERotation Lock

Post Range

No Time Programming Possible (ECM Proof)

Electrical Energy Capacitors Totally Discharged

No

Ig

nit

ion

En

erg

y

No

Ig

nit

ion

En

erg

y

Cartridge PercussionPropellant

Storage

Axial Lock SAFE

Phases:

Programmed Payload Ejection

Time Programming

Programming Window

0 ms

F2 16516 A5



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Ahead (ABM) System Function Reliability

Reliability

GMGround Mobile

DORMANTStorage

CLCannon Launch

Theoretical Reliability Prediction according:

MIL Handbooks 217F2 & 338

Results of ABM System Ahead Reliability:Results of ABM System Ahead Reliability:

In Theory In Theory > 97%> 97%

In PracticeIn Practice > 97%> 97%

F2 16260 AA



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35 mm Ahead (ABM) HETFProgrammable Payload Delivery

„String of Pearls“ at 550 rd/min of 35mm Ahead-HETF Ammo

M1 15555

1st Rd: 1200 m

10th Rd: 300 m

10 Rds between 1200 m & 300 m every 100 m!

Precise Time Space Payload Delivery up to 5000 rd/min!Precise Time Space Payload Delivery up to 5000 rd/min!Precise Time Space Payload Delivery up to 5000 rd/min!Precise Time Space Payload Delivery up to 5000 rd/min!

F2 15559 CC



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Compensation of theMuzzle Velocity Variation

Burst of 7 Rounds 35mm Ahead-HETF Ammo at 1.6 km Range

F2 15561 CD

Without Compensation

M1 15556

With CompensationM1 15557



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TM P-T03.02.07-189-B10_MVC-577F

30mm x 173 Ahead (ABM) KETF Subprojectile Payload: Layout & Footprint

F1 16358 AB

Version: 27 SP x 5 Layers (1.5 g) (Simulation after 500μs)

Layout of the 162 Subprojectiles

SP (1.24 g each) 27 SP x 6

Layers

Payload-Footprint on 1 x 1 m Al -Plate after Ejection of

the 162 SP (4 ms after ignition )



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30mm x 173 Ahead (ABM) KETF Subprojectile Dynamic Parameter

Projectile (162 SP)100% 12°

3.5 m2 (2.1 m)

55.4 m2 (8.4 m)

31.3 m2 (6.3 m)13.9 m2

(4.2 m)

Striking Area (Diameter)

46

12

5

3

Subprojectile-Density (#/m2)

Distance (m)

Velocity & Perforation (%)

94%

90%

85%

80%

Payload Ejection at 500 m Range (Cone of 12° Opening Angle)

F2 10138 CD



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Range of Subprojectiles [m]

Mild

Ste

el P

late

Th

ickn

ess

Pen

etra

ted

[m

m]

30mm x 173 Ahead (ABM) KETF Subprojectile Penetration Capability

Subprojectile (SP): 1.24 g # SP per Round: 162 Target Plate: Mild Steel



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30mm x 173 Ahead (ABM) KETF: 3 Rd BurstEffectiveness against ATGW-Bunker at 1 km

F2 16156 BB

Notice: ATGW: Anti-Tank Guided Weapon

Results: Numerous Full Perforations / 100% Damage (Demo: Dec.1999)



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30mm x 173 Ahead (ABM) KETF: 5 Round Burst against Squad of 7 - Target

M1 16501A8F1 16501 A84

Target: Squad of 7 (Field: 2 x 38m)

The video shows a 5 round burst fired to the target field (firing rate: 200 rd/min).

Distance between rounds: 9 m

Multiple perforations in each of the 7 target plates (2mm Fe):

13 Perforations/m2 on Average.

Target Field



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30mm x 173 Ahead (ABM) KETF againstUrban Target (Unprogrammed Fuze)

F2 15562 BB

Target: 20 cm Concrete Wall with double Steel-Structure Reinforced

Range: 500 m

Results: Target Fully Penetrated M1 15962BA



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F2 15256 BA

Lethality of a

3 Rd Burst against an

ATGW Bunker at 1500 m

HE

TF

(B

last

Fra

gm

enta

tion

)

KE

TF

(S

ub

pro

ject

iles)

Pk-Value

35mm x 228 Ahead (ABM) KETF & HETFagainst ATGW-Bunker



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• Power Supply: Set Back Generator (Activation over 28‘000 g); i.e no Battery

• Full Gun Unload Safety

• Safe & Arm: Mechanical & Electronic

• Time Programming of less than 64 ms not accepted (Default: Self Destruct )

• Each Bit programmed with Double Pulse

• Completeness Check on 12 Bit Message (if negative: Self Destruct On!)

• If no fuze programming required or possible: automatically Self Destruct On

• No Impact Sensor in Fuze: firing through bushes & tree branches w/o burst

• Total HE content less than 0.6 g for 30mm

F2 15037 CE

Ahead (ABM) KETF: Ahead Technology Main Safety Features



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One Ahead (ABM) Fuze System - Two Different Warhead Configurations

F2 16124 BC

Blast Fragmentation WarheadBlast Fragmentation Warhead HETFHETF (High Explosive Time Fuze)

Subprojectile WarheadSubprojectile Warhead KETFKETF (Kinetic Energy Time Fuze)

30mm x 173

35mm x 228

40mm x 53Scale:

Fuze



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Ahead (ABM) HETF Basic Concept for 40mm x 53 Automatic Grenade Launcher AGL

F2 15015 BA

Conventional HE Round (PD-Fuze)

Optimum for Air Burst

Munition



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F2 15254 BB

6008

6008

40 mm x 53 Ahead (ABM) HETF Firing Trials at 200 m & 1000 m Range

M1 16117BA

Remarks:

No fragments are flying backwards!

Firing Rate up to 570 rd/min (AGL-ST-Kinetics)



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Ahead (ABM) System Milestones

• 1973 8 bit - transmission demonstrated on a 20 mm shell at muzzle exit (1st “Ahead-like” programming)

• 1992 35 mm Ahead - Ammunition: technical presentation to international ammo experts /OCP- Test Center

• 1996 NATO qualification of the Ahead system (Canada)

• 1999 Demonstration of ABM 30 mm x 173 prototype

• 2000 Demonstration of ABM 40 mm x 53 prototype for AGL

• End 2003 - 35 mm Ahead ABM Systems fielded in 8 countries.

In evaluation / procurement in several others.

- 30 mm x 173/170 & 40 mm x 53 ABM in evaluation in several countries.

F2 16310 BC



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35mm Ahead (ABM) KETFDetonation in Ammo Box

Ejection Charge (0.9 g HE)

of One Round Detonated

Result: no damage

occurs to the other packed rounds and

therefore no sympathetic

detonation possible

F2 16516 A6

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Ahead (ABM) Fuze System Folie 1 P2 16512 AA, P-VP/FD/41, © 2004 Oerlikon Contraves Pyrotec AG,...

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