The BT-7-2, it was based on the BT chassis and was in use from 1936. General Details (Medium Tank) Specifications Operational Date(s) 1936 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 45 mph Max Cross Country Speed 33 mph Range Road 310 miles Range Cross Country 220 miles Fuel Type Unknown Fuel Capacity 174 gal Horse Power 450 hp Power/Weight unknown General Information The BT-7-2, it was based on the BT chassis and was in use from 1936. It was armed with 2 light machine guns. Its main armament consisted of a 45mm M1932 L/46 19/20K weighing 2.000 kg. 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 Weapon Details 45mm M1932 L/46 19/20K (Anti Tank Gun) History This was a 45mm Russian designed gun on a Rheinmetal Pak 37mm carriage, and was also used in various armoured vehicles. the Russian nomenclature for this gun was 19K for Anti Tank and 20K for Tank mounted guns. Manufactured 1932 - 1937 Calibre 45mm Length L/46 Rate of Fire 15 rpm Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content UBR-243P (AP Armor Piercing) 45mm 0.87Kg 760M/Sec Quoted Penetration 36mm@400m Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.13 0.27 0.56 1.2 1.91 2.68 3.52 4.41 Penetration(mm@30°) 46 44 40 32 27 22 18 14 Penetration(mm@0°) 54 52 47 38 31 26 21 17 Hit Probability(%) 79 79 76 71 55 30 12 6 UO-243 (HE High Explosive) 45mm 2Kg 343M/Sec ≈0.3Kg explosive Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.3 0.63 1.38 3.26 5.77 9.09 13.42 19.02 lateral dispersion means the side to side variation of the shell from the aiming point 50%(CEP) of shells land within +/- (mtr) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 80% of shells land within +/- (mtr) 95% of shells land within +/- (mtr) range dispersion means the back to front variation of the shell from the aiming point 50%(CEP) of shells land within +/- (mtr) 80% of shells land within +/- (mtr) 95% of shells land within +/- (mtr) Direct Fire Range(Mtr) 100 200 400 800 Flight Time(Secs) 0.3 0.6 1.23 2.59 Hit Probability(%) 79 76 71 30 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 3 mtr Burst radius Infantry in open 66% kill 6 mtr Burst radius Infantry in open 33% kill 15 mtr  Armour Penetration inc roof at 1 mtr 0 mm An explosion within 3 mtr of infantry in the open will cause 99% casualties - lethal. An explosion within 6 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. An explosion within 15 mtr of infantry in the open will cause 33% casualties. The blast effect of this shell exploding within 1 mtr of an armoured vehicle will not cause any significant armour damage. 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.

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