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Blutarski2004
04-09-2004, 10:11 AM
Gentlemen,

In a continuing effort to provide accurate, official and unbiased data to support a correction in the modelling of M2 50cal performance, herewith submit the following -

Source:
TM9-1907 Dept of the Army Technical Manual
BALLISTIC DATA AND PERFORMANCE OF AMMUNITION
July 1948

Ammunition and weapon characteristics used in the computation of armor penetration and striking velocity curves:

Projectile type: .50 cal AP M2
Projectile weight: 708 grains
Ballistic co-efficient: 0.458 (Sciacci method)
Weapon: Browning M2 .50 caliber machine gun
Muzzle velocity, 36-inch barrel: 2835 ft/sec

Note: The following values are taken from graphs of .50 cal ammunition performance which appear on pages 190 and 191 of the afore-mentioned manual.


STRIKING VELOCITY versus RANGE:
All values taken to nearest 25 ft/sec increment.
-----------------------------------------------
100___200___300___400___600___800___1000 YARDS
-----------------------------------------------
2700__2575__2450__2325__2100__1875__1675 ft/sec
823___785___747___709___640___572___511 M/sec


PENETRATION OF FACE HARDENED ARMOR versus RANGE AT 0 deg, 20 deg, and 30 deg INCLINATION FROM THE VERTICAL
-----------------------------------------------
100___200___300___400___600___800___1000 YARDS
-----------------------------------------------
At 0 degrees:
0.93__0.81__0.70__0.63__0.46__0.37__0.30 inches
23.6__20.6__17.8__16.0__11.7___9.4___7.6 mm

-----------------------------------------------
100___200___300___400___600___800___1000 YARDS
-----------------------------------------------
At 20 degrees:
0.70__0.62__0.55__0.49__0.39__0.32__0.27 inches
17.8__15.7__14.0__12.4___9.9___8.1___6.9 mm

-----------------------------------------------
100___200___300___400___600___800___1000 YARDS
-----------------------------------------------
At 30 degrees:
0.55__0.50__0.45__0.41__0.35__0.28__0.24 inches
14.0__12.7__11.4__10.4___8.9___7.1___6.1 mm


Penetration performance against homogeneous armor plate at any angle of obliquity is much better, as would be expected. I have this data available if anyone needs it.

I now wait patiently for the Big O to cast his benevolent gaze upon this matter.

BLUTARSKI

Blutarski2004
04-09-2004, 10:11 AM
Gentlemen,

In a continuing effort to provide accurate, official and unbiased data to support a correction in the modelling of M2 50cal performance, herewith submit the following -

Source:
TM9-1907 Dept of the Army Technical Manual
BALLISTIC DATA AND PERFORMANCE OF AMMUNITION
July 1948

Ammunition and weapon characteristics used in the computation of armor penetration and striking velocity curves:

Projectile type: .50 cal AP M2
Projectile weight: 708 grains
Ballistic co-efficient: 0.458 (Sciacci method)
Weapon: Browning M2 .50 caliber machine gun
Muzzle velocity, 36-inch barrel: 2835 ft/sec

Note: The following values are taken from graphs of .50 cal ammunition performance which appear on pages 190 and 191 of the afore-mentioned manual.


STRIKING VELOCITY versus RANGE:
All values taken to nearest 25 ft/sec increment.
-----------------------------------------------
100___200___300___400___600___800___1000 YARDS
-----------------------------------------------
2700__2575__2450__2325__2100__1875__1675 ft/sec
823___785___747___709___640___572___511 M/sec


PENETRATION OF FACE HARDENED ARMOR versus RANGE AT 0 deg, 20 deg, and 30 deg INCLINATION FROM THE VERTICAL
-----------------------------------------------
100___200___300___400___600___800___1000 YARDS
-----------------------------------------------
At 0 degrees:
0.93__0.81__0.70__0.63__0.46__0.37__0.30 inches
23.6__20.6__17.8__16.0__11.7___9.4___7.6 mm

-----------------------------------------------
100___200___300___400___600___800___1000 YARDS
-----------------------------------------------
At 20 degrees:
0.70__0.62__0.55__0.49__0.39__0.32__0.27 inches
17.8__15.7__14.0__12.4___9.9___8.1___6.9 mm

-----------------------------------------------
100___200___300___400___600___800___1000 YARDS
-----------------------------------------------
At 30 degrees:
0.55__0.50__0.45__0.41__0.35__0.28__0.24 inches
14.0__12.7__11.4__10.4___8.9___7.1___6.1 mm


Penetration performance against homogeneous armor plate at any angle of obliquity is much better, as would be expected. I have this data available if anyone needs it.

I now wait patiently for the Big O to cast his benevolent gaze upon this matter.

BLUTARSKI

VW-IceFire
04-09-2004, 10:41 AM
Thats some interesting information...what'd be great at this point is for someone to compile all of the documentation possible and submit it in a single document to Oleg Maddox so that he has a complete accounting for it and not scattered bits on a forum. May help.

But great find no doubt!

http://home.cogeco.ca/~cczerneda/sigs/tmv-sig1.jpg
RCAF 412 Falcon Squadron - "Swift to Avenge"

VF-10_Snacky
04-09-2004, 10:44 AM
good stuff

"Son of a B**ch! That's gonna leave a mark."

KG26_Alpha
04-09-2004, 12:41 PM
Source:
TM9-1907 Dept of the Army Technical Manual
BALLISTIC DATA AND PERFORMANCE OF AMMUNITION
July 1948

Obi_Kwiet
04-09-2004, 01:36 PM
Thats a good idea. Every one post thier OFFICAL findings about the M2 here. Mabey Gibage or someone elce can post it.

KG26_Alpha
04-09-2004, 03:09 PM
You dont expect 1948 data to be considered surely

paradoxbox
04-09-2004, 03:10 PM
I hope that post was a joke alpha, it's the same freaking gun!