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#: 973-724-7095stephen.mcfarlane@us.army.mil

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