USSR
IS-2

Tweet The IS-2 based on the existing IS and was in use from 1944. General Details Specifications Operational Date(s) 1944 Ordnance classification Quantity Produced 0 Weight unknown Crew 4 M.G's small 4 M.G's large(>10mm) n/a Length 8.40 mtr Width 3.15 mtr Height 2.74 mtr Engine Details/Performance Max Road Speed 23 mph Max Cross Country Speed 12 mph Range Road 150 miles Range Cross Country 130 miles Fuel Type Unknown Fuel Capacity 115 gal Horse Power 513 hp Power/Weight unknown General Information The IS-2 based on the existing IS and was in use from 1944. It was armed with 4 light machine guns. Its main armament consisted of a 122mm Gun D-25S L/45 which could penetrate 230 mm of flat plate at 200 metres Armour Details Turret Front 102mm @ 10° (104mm) Side 75mm @ 10° (76mm) Rear 50mm @ 10° (51mm) Top 35mm @ 90° (35mm) Superstructure Front 120mm @ 45° (170mm) Side 90mm @ 35° (110mm) Rear 64mm @ 25° (71mm) Top 25mm @ 90° (25mm) Hull Front 120mm @ 45° (170mm) Side 90mm @ 0° (90mm) Rear 64mm @ 0° (64mm) Top 25mm @ 90° (25mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 170 mm - Minimum 25 mm Weapon Details 122mm Gun D-25S L/45 (Tank Gun) History This was the 122 mm gun M1931/37 (A-19) in a tank mounting Manufactured 1943 - 1950 Calibre 122mm Length L/45 Rate of Fire 2 rpm   Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content OF-471 (APHE Armor Piercing High Explosive) 122mm 25Kg 800M/Sec Quoted Penetration 120mm @ 500mtr/30° ( ≈ 138mm/0°) Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.13 0.25 0.52 1.07 1.66 2.3 2.99 3.73 Penetration(mm@30°) 212 199 185 168 152 137 122 109 Penetration(mm@0°) 245 230 214 194 176 159 142 126 Hit Probability(%) 98 98 98 98 81 57 29 22 OF-471 (HE High Explosive) 122mm 25Kg 800M/Sec 3.600Kg explosive Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.13 0.25 0.52 1.07 1.66 2.3 2.99 3.73 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.13 0.25 0.52 1.07 1.66 2.3 2.99 3.73 Hit Probability(%) 98 98 98 98 81 57 29 22 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 4 mtr Burst radius Infantry in open 66% kill 9 mtr Burst radius Infantry in open 33% kill 24 mtr  Armour Penetration inc roof at 1 mtr 10 mm An explosion within 4 mtr of infantry in the open will cause 99% casualties - lethal. An explosion within 9 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. An explosion within 24 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 penetrate 10 mm of the tank armour including the roof.

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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