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© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
Developments in Short Range Training Ammunition
National Defense Industrial Association Small Arms SymposiumMay 2010
Author: Luis de Sousaluis.desousa@can.gd-ots.com
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
GD-OTS Canada SRTA Developments
Project Objectives for 5.56mm and .50cal SRTA
Current 7.62mm SRTA
Concept for 5.56mm and .50cal SRTA
Performance– Simulations
– Test Data
Applications/Benefits
Summary
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
Short Range Training Ammunition (SRTA)Project Objectives
To develop a 5.56mm and .50 cal SRTA – Eliminate need for weapon adaptors/ancillary equipment
– Increase effective ballistic match and training range of current SRTA
– Maximum range limited to approx 10% to 20% of ball
– Increase functioning reliability on respective weapon systems
– Increase performance with respect to current SRTA: M862 (5.56mm SRTA)
M858 Ball and Tracer M860 (.50 cal SRTA)
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
Current Product SHORT STOP® 7.62 mm SRTA
7.62 mm SHORT STOP® training round
Available in 4B/1T configuration
Now in Production for DoD as M973 & M974
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
SHORT STOP® 5.56 mm SRTA Development
5.56mm SRTA Requirements:– No weapon modification (conversion bolt)
– Max range of 600 m (at any elevation)
– Trajectory match up to 100m within ±2mils (threshold)
– 10 rds dispersion@100m ≤7.0cm (average mean radius)
– Full functional capability in M4/M16/M249
from -4oF to 104oF
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
5.56mm SRTA Concept
The 5.56mm SRTA Cartridge:– Lightweight molded compound projectiles (approx 2.25gr);
– Frangible lead free projectile;
– Forward fins design;
– Low environmental impact Material: No toxic/heavy metals;
Reduced terminal effects;
Reduced max range;
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
SRTA Ballistic Simulation
Comparison of velocity decay (PRODAS)Residual Velocity
0
200
400
600
800
1000
1200
1400
0 100 200 300 400 500 600 700 800 900 1000
Range (m)
Res
idua
l vel
ocity
(m/s
)
5.56 mm SRTA5.56 mm M8557.62 mm SRTA
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
SRTA Ballistic Simulation
Comparison of max range (PRODAS)Trajectory with 5.56 mm caliber
0
200
400
600
800
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1200
0 500 1000 1500 2000 2500 3000 3500
Range (m)
Alti
tude
(m)
5.56 mm M8555.56 mm SRTA 5.56 mm M862
QE = 34°
5.56mm SRTA: QE = 20°
M862: QE = 23°
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
SRTA Ballistic Simulation
5.56mm Drag Curves versus Mach
0
0,5
1
1,5
2
2,5
3
3,5
0 1 2 3Mach
Dra
g (C
D)
5.56mm SRTA XM1037/GD OTS C5.56mm M855
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
SRTA Ballistic Live Fire Results
Performance Summary 5.56mm SRTA
AmmunitionDistance
(m)
GD XM1037 M8621
Dispersion Mean radius in accuracy barrel25 .29 in .30 in
100 2.64 in NA
Vertical Match at target located X meters from the weapon vs operational
ammunition- accuracy barrel
25 .16 in .79 in
100 5.12 in NA
Maximum training range approx 100 m 25 m
Functioning in M4 YES NA
Functioning in M16 YES As per spec
Functioning in M249 YES NA
Maximum range 600 m2 250 m
Note 1: Maximum value taken from MIL-C-70725A (AR)Note 2: Maximum range measured was 434m
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
5.56mm SRTA Next Step
Delivery of 160K rounds to US Govt to conduct Design Verification Testing at APG (Phase III contract delivered June 2009);
– Majority of tests completed;
– Environmental testing and analysis ongoing
Limited production by GD OTS C fall 2010
At 2 meter
At 20 meters
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
SHORT STOP® .50cal SRTA Development
.50cal SRTA Original Requirements:– No modifications of M2 machinegun
– Improved ballistic match with M858 & M860 (T)
– Reliable functioning from –20 to +50ºC
– Lead free projectile
– Max range of 700 m (objective), 1000m (threshold)
– No splashback beyond 25 m (Target at 50m)
– Improved performance vs. M858
M858GD OTS C .50cal
SRTA
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
.50 Cal SRTA Voice of Customer
Conclusions– Key Customer Requirements Projectile Must not make use of any recoil amplifiers and/or
buffer devices
Surface Danger Zone (SDZ) requirements have precedence over ballistic match
Projectile should not exceed 700m (Objective) and 1000m (Threshold ). Revised threshold max range 700m.
Projectile should provide effective training range up to 300m ±50m on identified targets
Should have similar functionality/reliability/availability /maintainability/ barrel wear performance as ball
Tracer Projectile should be visual throughout the useful training range
Yaw at target not an issue.
Projectile must sink (Navy requirement)
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
.50 cal SRTA Concept
The .50 cal SRTA has:– Several projectile concepts under study
– Forward fins with controlled spin technology to limit range Fins introduce a "reverse" spin/drag, opposing rotation
The projectile quickly becomes dynamically unstable
– Very good accuracy due to consistent ballistic performance
– Frangible lead free projectile seems to be
most promising concept at this time
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
.50 cal SRTA Ballistic Simulation
Velocity decay vs. M33 simulation with PRODASResidual Velocity
0
100
200
300
400
500
600
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900
1000
0 200 400 600 800 1000
Range (m)
Res
idua
l vel
ocity
(m/s
)
12.7 mm SRTA 12.7 mm M33
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
.50 cal SRTA Ballistic Testing
Typical Drag vs. Velocity curve measured12,7mm Drag Curves versus Mach
0,00
0,50
1,00
1,50
2,00
2,50
3,00
3,50
4,00
0 0,5 1 1,5 2 2,5 3 3,5
Mach
Cd (D
rag)
GD 12,7mm SRTA
M33
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
.50 cal SRTA Ballistic Simulation
Maximum range simulation with PRODAS– Upcoming concept: less than 700 meters
Trajectory with 12.7 mm caliber
0
500
1000
1500
2000
2500
0 1000 2000 3000 4000 5000 6000 7000
Range (m)
Alti
tude
(m)
12.7 mm M3312.7 mm SRTA 12.7 mm M858
QE = 39°
SRTA: QE = 25°M858: QE = 25°
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
.50 cal SRTA Measured Performance
Ammunition Distance (m) GD SRTA M8581
100 1.6 in approx. 8 in 300 5.8 in
100 .9 in -
150 4.7 in no specified match
Maximum training range 300 m2 150 mMaximum range 720 m2 700 m
note 1: Maximum value taken from MIL-C-70723 (AR) note 2: As tested
12,7mm SRTA
Dispersion Mean radius in accuracy barrel
Vertical Match at target located X meters from the weapon verses operational
ammunition- accuracy barrel
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
.50 cal SRTA Ballistic Testing
300 Meter Ballistic Match and Accuracy Testing Oct 09– Tripod mounted machine gun (not an accuracy barrel)
– Dispersion grouping of 52x48 inches (M2 HB MG – tripod)
48’’
52’’
.50 LRTA
.50 SRTA
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
SRTA Ballistic Testing
Weapon cycling video
.50cal SRTA5.56mm SRTA
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
SUMMARY– The new family of small calibre SRTA lead free, frangible
concept represents an advance in SHORT RANGE small arms training technology
– The 5.56mm and .50 cal SRTA is currently an in-house R&D project
– The new family of small calibre SRTA will optimize the use of range training resources due to its significantly reduced danger-template
5.56mm and .50cal SRTA Summary
© 2010 General Dynamics Ordnance and Tactical Systems-Canada inc.
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Developments in Short Range Training Ammunition
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