7.62mm, Limited Range Lethal Round For USCG Informational ... · 7.62mm, Limited Range Lethal Round...
Transcript of 7.62mm, Limited Range Lethal Round For USCG Informational ... · 7.62mm, Limited Range Lethal Round...
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7.62mm, Limited Range Lethal Round For USCGInformational Brief for NDIA 200820 May 2008
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• Overview o JSSAP funded effort initiated in FY04 to
design, develop, and demonstrate a 7.62mm Limited Range Lethal Round (L2R2) that meets the unique needs and requirements of the US Coast Guard for use in harbor security applications.
• Objectives o Capable of engaging and defeating a variety of
seagoing vessels and personnel targets o Reduced maximum range to minimize collateral
damage to the areas surrounding the locations where the round will be employed.
o Success of program may lead to future “TC”, production & fielding.
Project Overview & Objectives
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• Defeat 1/4 inch of mild steel at 200 meters when fired from a M240B machine gun, at up to a 45-degree angle
• Match trajectory of M80 out to at least 400 meters.
• Capable of defeating soft target out to at least 400 meters.
• Maximum range of 2000 Meters (1500 Meters desirable)
• Capable of being fired from an M14 rifle and M240 Machine Gun with no weapon adapters / modifications
M80
L2R2
Customer Requirements
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• 3-piece projectile design satisfied penetration requirements
• Radar testing necessary to verify maximum range
• Additional modifications required to improve Dispersion
Summary from 2006
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Radar Testing
• Radar Testing was performed at the Aberdeen Test Center
• Tested 6 Configurations– Long Fin
• Low Propellant Charge• High Propellant Charge
– Medium Fin • Low Propellant Charge• High Propellant Charge
– Short Fin • Low Propellant Charge• High Propellant Charge
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Radar Test Results/L2R2 Safety Fan
Safety Fan
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400
600
800
1000
1200
1400
-1000 -800 -600 -400 -200 0 200 400 600 800 1000
Deflection, m
Ran
ge, m
max range qe=15deg
Preliminary
qe=1 deg
qe=0.5deg
Note, Circle represents test results for all configurations
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M80 and L2R2 Range Safety Fan Comparison
Safety Fan
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-2000 -1500 -1000 -500 0 500 1000 1500 2000
Deflection, m
Rang
e, m
max range qe=15deg
Preliminary
qe=1 degqe=0.5deg
M80
Ricochet Area for M80
M80 range safety fan is constructed from DA PAM 385-63
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Long Fin Dispersion Testing
L2R2 and M80 @ 200m
• Fired three five round groups• Average Circular Error Probable
(CEP)– 1in for M80– 9in for 3-Piece Rear Fin Design
• Unacceptable dispersion• Redesign 3-piece projectile and
fabricate a new alternative
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Technical Description of New Designs
• Three new designs have been investigated:– Three (3) piece design:
• Aluminum fins with small stem at the center • Copper jacket • Tungsten penetrator
– Three (3) piece design: • Aluminum fins with a large stem at the center• Copper jacket• Tungsten penetrator
– One (1) piece design:• Brass Banded Solid with sections removed
from the ogive (forward facing fins)
• Standard 7.62mm, M80 ball cartridge case,primer, and propellant
• Limited testing demonstrated reliable weapon function and ability to meet desired muzzle velocity
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New Designs Testing
• Tested dispersion and target penetration– Banded Brass Projectile without fins
penetrated target, low dispersion– Both 3-Piece design penetrated target, no
improvement in dispersion– Banded Brass Projectile with fins didn’t
impact target.
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Rear Finned Projectile
High-speed video of rear finned 3-Piece projectile with center stem @ 15ft from muzzle
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Forward Facing Finned Projectile
High-speed video of Banded Solid with Forward Facing Fins @ 15ft from muzzle
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Dispersion Testing Results
ATF Test
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-15 -10 -5 0 5 10 15
Horizontal Spread, inch
Vert
ical
Spr
ead,
inch
M80, 3 ShotsUSCG-0.10 Base Fin, 8 ShotsUSCG-0.15 Base Fine, 8 Shots
200 meters Range
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Testing Conclusions
• Rear Finned Projectile– Redesigned twice to improve dispersion– Minimal improvements in dispersion– Design abandoned due to possible tracer
requirement
• Forward Facing Finned Projectile– Poor stability, didn’t impact target– Promising concept, cg must be shifted
closer to nose– Design can accommodate tracer mix
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Corrective Actions
• Needed more stable baseline design• Chose the Standard 7.62 NATO Design, M80• Designed a solid brass projectile with dimensions equivalent to M80• Machined forward facing fins• Modeling showed that it would meet max range requirement
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New Designs Testing
Tested dispersion and target penetration (0.25”mild steel) for the designs displayed below.
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Forward Facing Finned Projectile
High-speed video of Brass M80 with Forward Facing Fins @ 15ft from muzzle
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Test Results, Dispersion @ 200m
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Test Results, Penetration
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Summary & Future Tasks
• Brass M80 with forward facing fins– Low dispersion– Poor target penetration
• Future Tasks– Model and Simulate projectile target penetration– Perform Spark Range Testing– Redesign for penetration and improved dispersion– Dispersion test at 400m– Radar test for max range
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Questions?
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Contact Info