USSR
BT-3 / BT-4

Tweet The BT-3 / BT-4 based on the existing BT and was in use from 1932. General Details Specifications Operational Date(s) 1932 Ordnance classification Quantity Produced 0 Weight unknown Crew 3 M.G's small 1 M.G's large(>10mm) n/a Length 5.54 mtr Width 2.26 mtr Height 1.95 mtr Engine Details/Performance Max Road Speed 69 mph Max Cross Country Speed 39 mph Range Road 187 miles Range Cross Country 125 miles Fuel Type Unknown Fuel Capacity 88 gal Horse Power 400 hp Power/Weight unknown General Information The BT-3 / BT-4 based on the existing BT and was in use from 1932. It was armed with 1 light machine gun. Its main armament consisted of a 45mm M1932 L/46 19/20K which could penetrate 41 mm of flat plate at 200 metres Armour Details Turret Front 13mm @ 10° (13mm) Side 13mm @ 10° (13mm) Rear 13mm @ 10° (13mm) Top 10mm @ 90° (10mm) Superstructure Front 13mm @ 30° (15mm) Side 13mm @ 0° (13mm) Rear 10mm @ 0° (10mm) Top 6mm @ 90° (6mm) Hull Front 13mm @ 30° (15mm) Side 13mm @ 0° (13mm) Rear 13mm @ 0° (13mm) Top 6mm @ 90° (6mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 15 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 0.28 0.58 1.28 2.16 3.27 4.75 6.77 Penetration(mm@30°) 38 35 31 25 21 16 12 9 Penetration(mm@0°) 45 41 36 30 25 19 15 11 Hit Probability(%) 98 98 98 93 60 25 8 3 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 0.61 1.28 2.84 4.77 7.24 10.5 15 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.3 0.61 1.28 2.84 4.77 7.24 10.5 15 Hit Probability(%) 98 98 93 34 8 2 0 0 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.

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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