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Britain
Bison

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The Bison was designed in 1940, manufactured by Concrete Limited based on the existing 4 x 2 drive commercial truck and was in use from 1940 to 1942.

Flag of World War 2 Britain
Photo of Bison ()
HM Goverment, Public domain, via Wikimedia Commons

General Details
Specifications
Operational Date(s)1940 - 1942
Quantity Produced150
Weightunknown
Crew8
M.G's small1
M.G's large(>10mm)n/a
Length6.20 mtr
Width2.80 mtr
Height3.00 mtr
Engine Details/Performance
Max Road Speed15 mph
Max Cross Country Speed3 mph
Range Road100 miles
Range Cross Country20 miles
Fuel TypePetrol
Fuel Capacityunknown
Horse Power75 hp
Power/Weightunknown
General Information
The Bison was designed in 1940, manufactured by Concrete Limited based on the existing 4 x 2 drive commercial truck and was in use from 1940 to 1942.

The vehicle was powered by Bedford '3.5 L' petrol powerplant producing 75 HP which could drive the vehicle on roads at up to 15 mph with a range of about 100 miles before refuelling. Its cross country performance was poor providing a max speed of about 3 mph and a range of about 20 miles.

It was armed with 1 light machine gun , a Bren Gun. This was a standard heavy british truck with a thick reinforced concrete structure built on top, various designs and truck bases were used so there were very few standard designs.

It was used as a mobile pill box for infantry to be protected from small arms fire, and was mostly used to defend airfields or by the home guard.

The walls were about 6 inches(152mm) thick and made from High Alumina Concrete that made them impervious to small arms fire and armour piercing bullets.

Armour Details
(Concrete 1mm equivalent to 0.1200mm RHA)
Turret
Frontn/a
Siden/a
Rearn/a
Topn/a
Superstructure
Front18mm@(18mm)
Side18mm@15°(19mm)
Rear18mm@15°(19mm)
Top18mm@90°(18mm)
Hull
Front18mm@(18mm)
Side18mm@15°(19mm)
Rear18mm@15°(19mm)
Top18mm@90°(18mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 19 mm - Minimum 18 mm



Weapon Details
Flag
Bren Gun
(Machine Gun)
Blank
photo of Bren Gun from Bren gun photo from Wikipedia
History
The Bren gun was licenced from the Czechoslovak ZB vz.27 light machine gun which was designed and manufactured in Brno from 1935.

It fired the standard British .303 rifle round.
Manufactured1930 - 2004
Calibre7.70mm
LengthL/82
Rate of Fire500 rpm
Number of Rounds 200
 
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
Standard british .303 round - HPBT
(BALL Standard Small Arms)
7.70mm 0.01Kg 761M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.17
Penetration(mm@30°) 1
Penetration(mm@0°) 2
Hit Probability(%) 98


 
Standard british .303 round
(BALL Standard Small Arms)
7.70mm 0.017Kg 783M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.15
Penetration(mm@30°) 4
Penetration(mm@0°) 5
Hit Probability(%) 98

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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