7.62mm, Lethal Limited Range Round For USCGInformational Brief for NDIA 201019 May 2010
Project Overview & Objectives
Overview
• JSSAP funded effort for USCG
• 7.62mm Lethal Limited Range Round
• For use in harbor security applications.
Objectives
• Reduced maximum range
• Engage and defeat
Customer Requirements
M80
L2R2
• Defeat 1/4 inch of mild steel at 200 meters, at 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
Value to Warfighter
• Operational environment close to civilian populace
• Lethal force often necessary to accomplish missions
• Use of Small Arms at times is restricted due to potential risk to civilians
• Reduced range ammunition will enable USCG to engage targets
Summary From 2008
• Brass M80 with forward facing fins– Pro
• Low dispersion – Con
• Poor target penetration
• Future Tasks– Model and Simulate projectile target penetration– Redesign for penetration and improved dispersion– Dispersion test at 400m– Radar test for max range
2007
2008
2009
Penetration Simulation 1820 ft/s
Penetration Simulation 2230 ft/s
Target Penetration 45 Deg Obliquity
Design LDC-FB 50% Perforation
Design LC-FB 100% Perforation
Target Penetration 45 Deg Obliquity
M80 Ball80% Perforation
0.000
0.050
0.100
0.150
0.200
0.250
0.300
0.350
0.400
0.450
0.500
0.000 0.500 1.000 1.500 2.000 2.500 3.000
Cd
Mach Number
M80
Large Cut - Medium Drag
Large Cut - Hi Drag
Effect of Cut Area On Drag
7.62mm USCG L2R2ATC Test Result 16 Sept 2008
LC – Hi Cd
M80LC- M Cd
Mach vs. Drag LC-FB
LC-FB Impact Locations on M80 Safety Fan
0.0
500.0
1000.0
1500.0
2000.0
2500.0
3000.0
3500.0
4000.0
4500.0
-2000.0 -1500.0 -1000.0 -500.0 0.0 500.0 1000.0 1500.0 2000.0
Rang
e, m
Deflection, m
LC-FB fired from M240B at 10° & 30° QE
Ricochet Area Ricochet Area
M80 Safety Fan Boundary
Mach vs. Drag LDC-FB
0.000
0.200
0.400
0.600
0.800
1.000
0.0 0.5 1.0 1.5 2.0 2.5 3.0
Mach Number
Cd
LDC-FBT-LoCdLDC-FBT-Hi-CdM80Ball
Drag Results of 17 June 09 ATC WEIBEL Radar Test
M80 Ball
LDC-FBT Low Drag
LDC-FBT Hi Drag
7.62 mm USCG L2R2
Ricochet Area Ricochet Area
M80 Safety Fan Boundary
LDC-FB Impact Locations on M80 Safety Fan
M80 Ball vs. LC-FB vs. LDC-FB
M80
LC-FB
LDC-FB
KPPs M80 Ball LC-FB LDC-FB≈ Max Range, 10°QE (m) 2765 2390 1865
≈ Max Range, 30°QE (m) 3715 3283 1967
Function M240B Y Y Y
Perforate Steel Target @ 200m at 45°angle
Y 100% 50%
Defeat Soft Target @ 400m Y Y Y
Match Trajectory of M80 @ 400M
__N N
Trajectory Comparison
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0 50 100 150 200 250 300 350 400 450
Range, m
Ord
inat
e, m
.
M80LDC-Hi-Cd
Trajectory Comparison between M80 and LDC-FB
300m Dispersion Test Results
-40
-35
-30
-25
-20
-15
-10
-5
0-4 -2 0 2 4 6 8 10
300m Dispersion Results
M80LDC-FB
400m Dispersion Test Results
-10.0
-5.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
0.0 2.0 4.0 6.0 8.0 10.0 12.0
400m Dispersion Results
LDC FB
M80
M240B Machine Gun Functioning
VIDEO
M14 EBR Rifle Functioning
VIDEO
Salt-Fog-Humidity Chamber
Salt-Fog-Humidity Results
M80Uncoated BrassSteel
Clear Coated Brass
Nickel Coated Brass
Salt-Fog-Humidity Results
Summary & Future Tasks
• Penetration 50%• Threshold Max Range Requirement met• Function requirement met• 400m trajectory comparable to M80• Brass Projectile better suited for Oceanic
environment than M80• Future Tasks
– Find industry partner that is able to manufacture and load projectiles on a large scale
– Evaluate Key Performance Parameters on larger scale
Questions?
Stephen McFarlaneProject EngineerSmall Caliber Munitions DivisionTel#: 973-724-7326Fax#: [email protected]
Ordinate Match Between LDC-FBT and M80 Ball
0
0.1
0.2
0.3
0.4
0.5
0 50 100 150 200 250 300 350 400 450
Range, m
Ord
inat
e M
atch
, mil
.
Ordinate Match Between LDC-FBT and M80
USCG L2R2
Projectile Muzzle Velocity QE(ft/s / m/s) (mil)
M80 2815 / 858 3.54LDC-FB 3089 / 942 3.54
Maximum Range Simulation
USCG L2R2
0
100
200
300
400
500
600
700
800
900
0 500 1000 1500 2000 2500 3000 3500
Range, m
Ord
inat
e, m
M80 BallLDC-FB-Lo_CdLDC-FB-Hi_Cd
Max Range From Simulation
M80 Ball
LDC-FB Hi-Cd
LDC-FB Lo-Cd
Projectile Mv QE Max Rge(m/s) (deg) (m)
M80 Ball 858 25 3291LDC-FB (Lo Cd) 942 18 2164LDC-FB (Hi Cd) 942 14 1460
Note actual data from safety fan chart indicates that LDC-FB design meets max range requirement.
300m Dispersion Test Results
-40
-35
-30
-25
-20
-15
-10
-5
0-4 -2 0 2 4 6 8 10
300m Dispersion Results
M80LDC-FB
Projectile Mean Radius (in) MilsM80 2.53 0.22M80 Brass 4.35 0.38LDC-LF 8.03 0.69LDC-NB 9.62 0.83LDC-FB 3.23 0.28LC-NB 5.82 0.50LDC-SF 4.42 0.38
300m Dispersion Results
400m Dispersion Test Results
Projectile Mean Radius (in) MilsLDC-FB 8.6 0.75M80 3.0 0.26
400m Dispersion Results
-10.0
-5.0
0.0
5.0
10.0
15.0
20.0
25.0
30.0
0.0 2.0 4.0 6.0 8.0 10.0 12.0
400m Dispersion Results
LDC FB
M80