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British Tests with 100mm APBC from SU 100

November 30, 2002 by Guest in russian military forum
The John Salt site contains a snippet from document DEFE 15/1107, entitled "The Performance of Russian SU-100 APHE/T Shot UBR-412B Against Armor Plate", which deals with firing trials using two captured SU 100 from Suez during 1956.

Penetration stats are provided for following angles at 0 and 1000 yards: 30, 45, 60 and 70 degrees from vertical.

0 Yards
164mm at 30 degrees
133mm at 45
96mm at 60
59mm at 70

1000 Yards
140mm at 30 degrees
115mm at 45
82-85mm at 60
51mm at 70

To see how the above figures compare to U.S. tests with 100mm BR-412B against cast armor, the British figures for rolled armor penetration were converted to equivalent cast thickness using the factors in our book, WW II BALLISTICS: Armor & Gunnery.

The 164mm plate penetration figure at 0 yards and 30 degrees in the British tests corresponds to 1850 yards on the U.S. curves, where the impact velocity is 2915 fps (889 m/s). The 1000 yard British range would then relate to 2850 yards on the U.S. curves and a velocity of 2680 fps (817 m/s).

The British and American test results compare in the following manner for equivalent cast armor penetration:

0 Yard Range
30 degrees, British and Americans have 164mm as base data
45 degrees, British figures have 135mm, U.S. data has 149mm (10% difference)
60 degrees, British have 103mm, U.S. has 108mm (5% difference)
70 degrees, British have 67mm, U.S. has 69mm (3% difference)

1000 Yard Range
30 degrees, British have 141mm, U.S. has 149mm (6% difference)
45 degrees, British have 120mm, U.S. has 134mm (12% difference)
60 degrees, British have 91mm, U.S. has 94mm (3% difference)
70 degrees, British have 59mm, U.S. has 60mm (2% difference)

Assuming a muzzle velocity of 889 m/s at 0 yards, the methodologies in our book predict a 1000 yard velocity of 818 m/s for 100mm APBC, whereas the actual is 817. Not bad for a regression estimate.

Penetration data on John Salt site is available at:
http://salts.britwar.co.uk/mod/fileman/files/WW2pen14May02.PDF


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