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Germany
15cm sIG 33 Gw II (Bison)

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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.

Flag of World War 2 Germany
Photo of 15cm sIG 33 Gw II (Bison)
15cm sIG 33 Gw II(Bison) scale illustration

General Details
Specifications
Operational Date(s)1941 - 1945
Quantity Produced12
Weight11.2 tonne
Crew4
M.G's small1
M.G's large(>10mm)n/a
Length4.81 mtr
Width2.28 mtr
Height2.30 mtr
Engine Details/Performance
Max Road Speed25 mph
Max Cross Country Speed12 mph
Range Road100 miles
Range Cross Country40 miles
Fuel TypePetrol
Fuel Capacityunknown
Horse Power140 hp
Power/Weight12 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 81 mm of flat plate at 400 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
Frontn/a
Siden/a
Rearn/a
Topn/a
Superstructure
Front30mm@(30mm)
Side15mm@30°(17mm)
Rear15mm@10°(15mm)
Top5mm@90°(5mm)
Hull
Front30mm@15°(31mm)
Side15mm@(15mm)
Rear15mm@15°(16mm)
Top5mm@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)
Blank
photo of 15cm sIG 33 L/11 from By Own work, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?cur
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).
ManufacturerRheinmetal
Manufactured1927 - 1945
Calibre150mm
LengthL/11
Rate of Fire3rpm
 
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)1002004008001200160020002400
Flight Time(Secs) 0.42 0.84 1.71 3.52 5.44 7.46 9.62 11.91
Direct Fire
Range(Mtr)1002004008001200160020002400
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% kill6 mtr Burst radius Infantry in open 66% kill12 mtr
Burst radius Infantry in open 33% kill30 mtr  Armour Penetration inc roof at 2 mtr24 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)1002004008001200160020002400
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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