Germany
15cm sIG 33 Gw II (Bison)

Tweet The 15cm sIG 33 Gw II was designed in 1939, manufactured by Alkett based on the existing fully tracked PzKpfw II Ausf B and was in use from 1941 to 1945. General Details Specifications Operational Date(s) 1941 - 1945 Quantity Produced 12 Weight 11.2 tonne Crew 4 M.G's small 1 M.G's large(>10mm) n/a Length 4.81 mtr Width 2.28 mtr Height 2.30 mtr Engine Details/Performance Max Road Speed 25 mph Max Cross Country Speed 12 mph Range Road 100 miles Range Cross Country 40 miles Fuel Type Petrol Fuel Capacity unknown Horse Power 140 hp Power/Weight 12 hp/tonne General Information The 15cm sIG 33 Gw II was designed in 1939, manufactured by Alkett based on the existing fully tracked PzKpfw II Ausf B and was in use from 1941 to 1945. The vehicle was powered by Bussing-NAG 'petrol' petrol powerplant producing 140 HP which could drive the vehicle on roads at up to 25 mph with a range of about 100 miles before refuelling. Its cross country performance was good providing a max speed of about 12 mph and a range of about 40 miles. It was armed with 1 light machine gun. Its main armament consisted of a 15cm sIG 33 L/11 which could penetrate 75 mm of flat plate at 800 metres This vehicle was based on an extended PzKpfw II Ausf B with a chassis extended by 60 cm that allowed an extra roadwheel to be added to the vehicle. Armour Details Turret Front n/a Side n/a Rear n/a Top n/a Superstructure Front 30mm @ 9° (30mm) Side 15mm @ 30° (17mm) Rear 15mm @ 10° (15mm) Top 5mm @ 90° (5mm) Hull Front 30mm @ 15° (31mm) Side 15mm @ 0° (15mm) Rear 15mm @ 15° (16mm) Top 5mm @ 90° (5mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 31 mm - Minimum 5 mm Weapon Details 15cm sIG 33 L/11 15cm schwere Infanteriegeschutz 33 L/11 (translates as Heavy Artillery) History Standard German army heavy infantry gun originally issued in 1927 was still being produced at the end or the war. This gun was also mounted on a number of motorised chassis such as the 15cm s.I.G 33 Gw II(A,B,C,F). Manufacturer Rheinmetal Manufactured 1927 - 1945 Calibre 150mm Length L/11 Rate of Fire 3rpm   Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content 15cm I Gr 33 (HE High Explosive) 150mm 38Kg 240M/Sec 8.300Kg explosive Maximum Range 4700 Mtr Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.42 0.84 1.71 3.52 5.44 7.46 9.62 11.91 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.42 0.84 1.71 3.52 5.44 7.46 9.62 11.91 Hit Probability(%) 98 98 77 22 6 2 1 0 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 6 mtr Burst radius Infantry in open 66% kill 12 mtr Burst radius Infantry in open 33% kill 30 mtr  Armour Penetration inc roof at 2 mtr 24 mm An explosion within 6 mtr of infantry in the open will cause 99% casualties - lethal. An explosion within 12 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. An explosion within 30 mtr of infantry in the open will cause 33% casualties. The blast effect of this shell exploding within 2 mtr of an armoured vehicle will penetrate 24 mm of the tank armour including the roof. 15cm I Gr 39 Hl/A (HEAT High Explosive Anti-Tank) 150mm 25Kg 240M/Sec Quoted Penetration 160mm @ 500mtr/0° Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.42 0.84 1.71 3.52 Penetration(mm@30°) 160 160 160 160 Penetration(mm@0°) 160 160 160 160 Hit Probability(%) 98 98 77 22

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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