The IS-3, it was based on the IS chassis and was in use from 1945. General Details (Heavy Tank) Specifications Operational Date(s) 1945 Ordnance classification Quantity Produced 0 Weight unknown Crew 4 M.G's small 2 M.G's large(>10mm) n/a Length 10.08 mtr Width 3.23 mtr Height 2.74 mtr Engine Details/Performance Max Road Speed 23 mph Max Cross Country Speed 12 mph Range Road 130 miles Range Cross Country 94 miles Fuel Type Unknown Fuel Capacity 106 gal Horse Power 513 hp Power/Weight unknown General Information The IS-3, it was based on the IS chassis and was in use from 1945. It was armed with 2 light machine guns. Its main armament consisted of a 122mm Gun D-25S L/45 weighing 25.000 kg. Armour Details Turret Front 102mm @ 30° (118mm) Side 75mm @ 30° (87mm) Rear 50mm @ 20° (53mm) Top 35mm @ 90° (35mm) Superstructure Front 120mm @ 45° (170mm) Side 90mm @ 35° (110mm) Rear 90mm @ 20° (96mm) Top 45mm @ 90° (45mm) Hull Front 120mm @ 45° (170mm) Side 90mm @ 0° (90mm) Rear 90mm @ 0° (90mm) Top 45mm @ 90° (45mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 170 mm - Minimum 45 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 0.51 1.05 1.61 2.2 2.81 3.44 Penetration(mm@30°) 154 151 146 136 127 118 110 103 Penetration(mm@0°) 178 175 169 158 147 137 128 119 Hit Probability(%) 98 98 95 88 68 55 37 25 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 0.51 1.05 1.61 2.2 2.81 3.44 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) 0.13 0.25 0.52 1.07 Hit Probability(%) 98 98 95 88 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. 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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