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Britain
Cruiser Mk IIA C.S. (A10)
Ordnance classification - A10

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The Cruiser Mk IIA C.S. was designed in 1937, manufactured by Vickers Armstrong based on the existing fully tracked A9 and was in use from 1939 to 1941.

Photo of Cruiser Mk IIA C.S. (A10)

General Details
Specifications
Operational Date(s)1939 - 1941
Ordnance classificationA10
Quantity Produced30
Weight14.3 tonne
Crew5
M.G's small2
M.G's large(>10mm)n/a
Length5.60 mtr
Width2.56 mtr
Height2.62 mtr
Engine Details/Performance
Max Road Speed16 mph
Max Cross Country Speed8 mph
Range Road100 miles
Range Cross Country40 miles
Fuel TypePetrol
Fuel Capacity117 gal
Horse Power150 hp
Power/Weight10 hp/tonne
General Information
The Cruiser Mk IIA C.S. was designed in 1937, manufactured by Vickers Armstrong based on the existing fully tracked A9 and was in use from 1939 to 1941.

The vehicle was powered by Associated Equipment Company(AEC) 'AEC Type A179' petrol powerplant producing 150 HP which could drive the vehicle on roads at up to 16 mph with a range of about 100 miles before refuelling. Its cross country performance was good providing a max speed of about 8 mph and a range of about 40 miles.

It was armed with 2 light machine guns which were BESA Machine Gun 7.92mms. Its main armament consisted of an Ordnance Q.F. 3.7inch CS Howitzer which could penetrate 60 mm of flat plate at 200 metres

The Mk II C.S. close support version was the Mk I but with a 3.7 inch howitzer. The vehicle had the two auxilliary machine gun from the Mk I removed , and replaced by one hull mounted machine gun. The armour was upgraded hence the speed reduction.

Armour Details
Turret
Front30mm@20°(32mm)
Side26mm@20°(28mm)
Rear30mm@20°(32mm)
Top7mm@90°(7mm)
Superstructure
Front22mm@45°(31mm)
Side22mm@(22mm)
Rear12mm@(12mm)
Top7mm@90°(7mm)
Hull
Front22mm@30°(25mm)
Side22mm@(22mm)
Rear12mm@(12mm)
Top7mm@90°(7mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 32 mm - Minimum 7 mm



Weapon Details
Flag
BESA Machine Gun 7.92mm Blank
photo of BESA Machine Gun 7.92mm from Wikipedia
History
Developed by BSA from the Czechoslovak ZB vz.53 heavy machine gun which used the German 7.92×57mm Mauser ammunition. It was mostly used as the main armament of the Light Tank Mk VIC and Armoured cars such as the Humber Mk I to Mk III.

This 7.92mm gun was used in the armoured divisions as their supply lines were separated from the infantry who used .303 bullets. Once the British started capturing German ammunition this could be immediately used in these tank machine guns.
Manufactured1939 - 1966
Calibre7.92mm
LengthL/93
Rate of Fire450 rpm
Number of Rounds 2000
 
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
Cartridge SA, 7.92(AP)
7.92mm 0.012Kg 785M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.15
Penetration(mm@30°) 2
Penetration(mm@0°) 3
Hit Probability(%) 98


Weapon Details
Flag
Ordnance Q.F. 3.7inch CS Howitzer Blank
Manufacturedunknown - 1941
Calibre94mm
Number of Rounds 40
 
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP(AP)
94mm 15Kg 189M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.53 1.08 2.21 4.63 7.28 10.2 13.45 17.05
Penetration(mm@30°) 54 51 47 43 38 34 31 27
Penetration(mm@0°) 63 60 55 50 45 40 36 32
Hit Probability(%) 98 98 57 8 2 0 0 0

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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