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USSR
BT-7M

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The BT-7M based on the existing BT and was in use from 1938.

Flag of World War 2 Union Soviet Socialist Republics

General Details
Specifications
Operational Date(s)1938
Ordnance classification
Quantity Produced0
Weightunknown
Crew3
M.G's small2
M.G's large(>10mm)n/a
Length5.74 mtr
Width2.46 mtr
Height2.31 mtr
Engine Details/Performance
Max Road Speed54 mph
Max Cross Country Speed39 mph
Range Road440 miles
Range Cross Country375 miles
Fuel TypeUnknown
Fuel Capacity174 gal
Horse Power500 hp
Power/Weightunknown
General Information
The BT-7M based on the existing BT and was in use from 1938.

It was armed with 2 light machine guns. Its main armament consisted of a 76.2mm Regimental Gun M27 L/16 which could penetrate 61 mm of flat plate at 200 metres


Armour Details
Turret
Front15mm@10°(15mm)
Side13mm@10°(13mm)
Rear13mm@10°(13mm)
Top6mm@90°(6mm)
Superstructure
Front22mm@50°(34mm)
Side13mm@(13mm)
Rear13mm@(13mm)
Top6mm@90°(6mm)
Hull
Front22mm@30°(25mm)
Side13mm@(13mm)
Rear13mm@(13mm)
Top6mm@90°(6mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 34 mm - Minimum 6 mm



Weapon Details
Flag
76.2mm Regimental Gun M27 L/16 Blank
Calibre76.20mm
LengthL/16
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP
(AP Armor Piercing)
76.20mm 6.2Kg 387M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.26 0.53 1.09 2.31 3.68 5.23 7.01 9.06
Penetration(mm@30°) 57 52 48 42 37 32 27 23
Penetration(mm@0°) 66 61 56 49 43 37 32 27
Hit Probability(%) 98 98 98 54 22 6 2 1

Hit probability is based on a static 2 x 2.4 metre panel at 0 degrees(vertical) at the range specified.

The data that has been used to create these records has come from Wikipedia, The Lone Sentry, The Bundes Archive and numerous books and websites that have provided the detailed information that has not been available anywhere else. The information we use to calculate the penetration tables, flight times and the hit probability comes from the Gun Calibre, the Shell Mass(Kg) and the muzzle velocity, plus range reductions to allow for gravity and wind resistance. This calculation originally came from a pre-war Krupp calculation which has been modified, and seems to fit the actual test results.

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