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© 2007 General Dynamics Ordnance and Tactical Systems-Canada inc.
105 mm HEP-IMReduced Vulnerability / Enhanced Lethality
Direct Fire Large Caliber HE Ammunition for MGS
105 mm HEP105 mm HEP--IMIMReduced Vulnerability / Enhanced LethalityReduced Vulnerability / Enhanced Lethality
Direct Fire Large Direct Fire Large CaliberCaliber HE Ammunition for MGSHE Ammunition for MGS
Presented by Roger Gelinas
23 April 2008
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105 mm HEP-IM Cartridge 105 mm HEP-IM Cartridge
Vulnerability of the 105 mm HEP cartridge to external threats compromises the MGS crew survivability
GD-OTS Canada developed a low vulnerability version of the 105 mm HEP cartridge compatible with the MGS platform to meet these needs
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Standard 105 mm HEP M393Standard 105 mm HEP M393
M1 PropellantBase Fuze
Booster: Comp A5
HE (Comp A3)
Steel Body
Steel Case
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Design ConstraintsDesign Constraints
Maintain performance level with current HEP ammunition
Maintain ballistic compatibility
Development should not require full qualification of the cartridge
Production cost competitive with current HEP ammunition
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Technical RoadmapTechnical Roadmap
Approach Rationale
Focus on HE projectileProjectile is the main contributor to the reaction violence to stimuli
No change to the propelling charge system
Lower reaction than projectile
Avoid extensive qualification
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Changes to ProjectileChanges to Projectile
Qualified IM explosive(enhanced blast)
Threaded noseconnection
Fuze booster made of IM material
High fragmentation steel body
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Changes to Cartridge CaseChanges to Cartridge Case
Replace steel with brass cartridge case – Crimp force reduced by 50%
Reduces confinement of propellant for lower reaction to FCO
Successful testing in MGS autoloader
Crimp area
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Changes to Packaging(PA 117 cont’d)Changes to Packaging(PA 117 cont’d)
Reduce strength of cover locking pin– Allows separation of case to projectile during
Cook-Off (reduces propellant confinement)
Locking pin
Withstands 2.1m drop test
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Changes to Packaging(PA 117 cont’d)Changes to Packaging(PA 117 cont’d)
Use HDPE sleeve around warhead to avoid sympathetic detonation
HDPE sleeve
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Bullet Impact on HEP-IM ProjectileTest Results
Bullet Impact on HEP-IM ProjectileTest Results
Type IV Reaction
Pictures were removed N. Maher
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Fast Cook-Off on HEP-IM CartridgeTest Results
Fast Cook-Off on HEP-IM CartridgeTest Results
Type IV Reaction
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Sympathetic Detonation on HEP-IM Cartridge – Test Set-upSympathetic Detonation on HEP-IM Cartridge – Test Set-up
Red detonates (donor)
Green are receivers
Blue is a dummy
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Sympathetic Detonation on HEP-IM Cartridge – Test ResultsSympathetic Detonation on HEP-IM Cartridge – Test Results
Type III Reaction
No indentation into witness plate
IM explosive dispersed around test site
Projectile metal parts broken in pieces without evidence of fragmentation
Witness plate
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Warhead Terminal EffectsWarhead Terminal Effects
Demonstrated capability to breachthe 8- inch thick DRCW target
Size of opening # of rounds
Minimum 24’’ x 48’’ 5 rounds
Objective 30’’ x 50’’ 3 rounds
Results of gun firings 32’’ x 72’’ 3 rounds
Requirements
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Warhead Terminal EffectsWarhead Terminal Effects
27’’ x 55’’ Opening
2 shots
32’’ x 72’’ Opening
3 shots
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Warhead Terminal Effects (Lethality)Warhead Terminal Effects (Lethality)
40% increased lethal area against personnel in the open vs current HEP
Contributors–High-frag steel –Enhanced blast explosive
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Warhead Terminal Effects (Lethality)Warhead Terminal Effects (Lethality)
Comparative simulation based on:50% probability of kill
Protected personnel(Helmet and US winter clothing)
Standing personnel
Ground impact
0
50
100
150
200
250
Leth
al A
rea
(m2 )
105mm HEP 169 76 32105mm HEP-IM 214 109 43
Pk ≥ 10% Pk ≥ 50% Pk ≥ 90%
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105 mm HEP-IM Cartridge105 mm HEP-IM Cartridge
REACTION TYPES
HEP-IM(actual testing) MIL-STD-2105 C
BULLET IMPACT (0.50 AP) ON PROJECTILE IV V
FAST COOK-OFF IV V
SYMPATHETIC DETONATION III III
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105 mm HEP-IM (Conclusions) 105 mm HEP-IM (Conclusions)
Improved MGS crew survivability– HE-IM explosive
Increased terminal effect– Breaching 8’’ DRCW (exceeds requirements)
– Anti-personnel increased by 40%
Low risk development program approach– Modification of existing cartridge
Propelling system does not need to be re-qualified
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Questions
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