Union Soviet Socialist Republics BT-7M

World War 2 Tank and Gun Database

The BT-7M, it was based on the BT chassis and was in use from 1938.

Flag of World War 2 Union Soviet Socialist Republics

General Details (Medium Tank)

Specifications
Operational Date(s)	1938
Ordnance classification
Quantity Produced	0
Weight	unknown
Crew	3
M.G's small	2
M.G's large(>10mm)	n/a
Length	5.74 mtr
Width	2.46 mtr
Height	2.31 mtr
Engine Details/Performance
Max Road Speed	54 mph
Max Cross Country Speed	39 mph
Range Road	440 miles
Range Cross Country	375 miles
Fuel Type	Unknown
Fuel Capacity	174 gal
Horse Power	500 hp
Power/Weight	unknown

General Information
The BT-7M, it was based on the BT chassis 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 39.5 mm of flat plate at 100 metres.

Armour Details

Turret
Front	15mm	@	10°	(15mm)
Side	13mm	@	10°	(13mm)
Rear	13mm	@	10°	(13mm)
Top	6mm	@	90°	(6mm)

Superstructure
Front	22mm	@	50°	(34mm)
Side	13mm	@	0°	(13mm)
Rear	13mm	@	0°	(13mm)
Top	6mm	@	90°	(6mm)

Hull
Front	22mm	@	30°	(25mm)
Side	13mm	@	0°	(13mm)
Rear	13mm	@	0°	(13mm)
Top	6mm	@	90°	(6mm)

Armour (x)mm @ (y)° (Effective mm @ 0°)

Effective Armour - Maximum 34 mm - Minimum 6 mm


76.2mm Regimental Gun M27 L/16
	Calibre	76.20mm
	Length	L/16

Ammunition Details
Name/Id	Calibre Weight MVelocity					Explosive Content
AP (AP Armor Piercing)	76.20mm 6.2Kg 387M/Sec
Range(Mtr)	100	200	400	800	1200	1600	2000	2400
Flight Time(Secs)	0.26	0.54	1.12	2.4	3.84	5.43	7.16	9.01
Penetration(mm@30°)	34	32	28	22	18	14	11	9
Penetration(mm@0°)	40	37	33	26	21	17	13	10
Hit Probability(%)	93	90	83	52	14	3	3	2

About Penetration Figures

All penetration figures in this database are calculated to a common standard based on German WWII testing criteria (complete penetration with functioning fuze). This allows direct comparison between all nations' guns.

Original national test figures would be higher for some nations due to different criteria:

German: 1.00? (baseline - strictest)
British: 1.02? (slightly looser)
American: 1.05? (50% mass through plate)
Soviet: 1.10? (75% mass through plate)

For example, a Soviet gun showing 159mm here would be published as ~175mm in Soviet documents, and a German gun showing 120mm would be published as 120mm in German documents. The 159mm figure is directly comparable to the German 120mm - the Soviet gun really was more powerful.

National Testing Standards
German:	1.00? - Complete penetration, fuze functions (strictest)
British:	1.02? - Complete penetration
American:	1.05? - 50% of shell mass through plate
Soviet:	1.10? - 75% of shell mass through plate
All database figures are normalized to German standard for direct comparison. Multiply by the factor above to see original national test figures.

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.