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Britain
Cruiser Mk I C.S. (A9)
Ordnance classification - A9

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The Cruiser Mk I C.S. was designed in 1937, manufactured by Vickers Armstrong based on the existing fully tracked A9 and was in use from 1938 to 1941.

Flag of World War 2 Britain
Photo of Cruiser Mk I C.S. (A9)

General Details
Specifications
Operational Date(s)1938 - 1941
Ordnance classificationA9
Quantity Produced10
Weight12 tonne
Crew6
M.G's small3
M.G's large(>10mm)n/a
Length5.92 mtr
Width2.56 mtr
Height2.56 mtr
Engine Details/Performance
Max Road Speed25 mph
Max Cross Country Speed13 mph
Range Road150 miles
Range Cross Country60 miles
Fuel TypePetrol
Fuel Capacity86 gal
Horse Power150 hp
Power/Weight12 hp/tonne
General Information
The Cruiser Mk I C.S. was designed in 1937, manufactured by Vickers Armstrong based on the existing fully tracked A9 and was in use from 1938 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 25 mph with a range of about 150 miles before refuelling. Its cross country performance was good providing a max speed of about 13 mph and a range of about 60 miles.

It was armed with 3 light machine guns which were Vickers Medium Machine Guns. Its main armament consisted of an Ordnance Q.F. 3.7inch CS Howitzer which could penetrate 36 mm of flat plate at 200 metres

The Mk I C.S. close support version was the Mk I but with a 3.7 inch howitzer mounted in the turret.

Armour Details
Turret
Front14mm@20°(15mm)
Side12mm@20°(13mm)
Rear14mm@20°(15mm)
Top4mm@90°(4mm)
Superstructure
Front14mm@45°(20mm)
Side10mm@(10mm)
Rear10mm@(10mm)
Top5mm@90°(5mm)
Hull
Front14mm@30°(16mm)
Side10mm@(10mm)
Rear10mm@(10mm)
Top5mm@90°(5mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 20 mm - Minimum 5 mm



Weapon Details
Flag
Vickers Medium Machine Gun
(Machine Gun) x 3
Blank
photo of Vickers Medium Machine Gun from Vickers medium machine gun Wikipedia
History
The Vickers medium machine gun was designed during World War I as a replacement for the Maxim gun from which its design was taken.

It served throughout World War I and II as a fixed point machine gun used to suppress areas and act as a defensive point.
ManufacturerVickers
Manufactured1912 - 1968
Calibre7.70mm
LengthL/93
Rate of Fire450 rpm
Number of Rounds 3000
 
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
Standard british .303 round - MkVIII (only used in Vickers Mg)
(BALL Standard Small Arms)
7.70mm 0.01Kg 844M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.14
Penetration(mm@30°) 2
Penetration(mm@0°) 3
Hit Probability(%) 98



Weapon Details
Ordnance Q.F. 3.7inch CS Howitzer
(Field Gun)
Blank
Manufacturedunknown - 1941
Calibre94mm
LengthL/15
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
3.7inch CS HE
(HE High Explosive)
94mm 9Kg 189M/Sec ≈1.35Kg explosive
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.54 1.08 2.21 4.63 7.28 10.21 13.44 17.06
Direct Fire
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.54 1.08 2.21 4.63 7.28 10.21 13.44 17.06
Hit Probability(%) 98 98 57 8 2 0 0 0
Blast/Fragmentation Effects
Burst radius Infantry in open 99% kill4 mtr Burst radius Infantry in open 66% kill8 mtr
Burst radius Infantry in open 33% kill22 mtr  Armour Penetration inc roof at 1 mtr4 mm
An explosion within 4 mtr of infantry in the open will cause 99% casualties - lethal.
An explosion within 8 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's.
An explosion within 22 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 4 mm of the tank armour including the roof.

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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