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Britain
Cruiser Mk IVA (A13 Mk II)
Ordnance classification - A13

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The Cruiser Mk IVA was designed in 1937, manufactured by Nuffield Mechanisations & Aero, Limited and was in use from 1939 to 1941.

Photo of Cruiser Mk IVA (A13 Mk II)

General Details
Specifications
Operational Date(s)1939 - 1941
Ordnance classificationA13
Quantity Produced665
Weight14.75 tonne
Crew4
M.G's small1
M.G's large(>10mm)n/a
Length6.08 mtr
Width2.56 mtr
Height2.62 mtr
Engine Details/Performance
Max Road Speed28 mph
Max Cross Country Speed15 mph
Range Road90 miles
Range Cross Country36 miles
Fuel TypePetrol
Fuel Capacity120 gal
Horse Power340 hp
Power/Weight23 hp/tonne
General Information
The Cruiser Mk IVA was designed in 1937, manufactured by Nuffield Mechanisations & Aero, Limited and was in use from 1939 to 1941.

The vehicle was powered by Nuffield 'Liberty' petrol powerplant producing 340 HP which could drive the vehicle on roads at up to 28 mph with a range of about 90 miles before refuelling. Its cross country performance was good providing a max speed of about 15 mph and a range of about 36 miles.

It was armed with 1 light machine gun , a BESA Machine Gun 7.92mm. Its main armament consisted of an Ordnance Q.F. 2pdr which could penetrate 67 mm of flat plate at 200 metres

This was one of the first British tanks to use the Christie type of suspension.

Armour Details
Turret
Front30mm@20°(32mm)
Side16mm@20°(17mm)
Rear16mm@20°(17mm)
Top4mm@90°(4mm)
Superstructure
Front25mm@45°(35mm)
Side14mm@(14mm)
Rear14mm@(14mm)
Top4mm@90°(4mm)
Hull
Front25mm@30°(29mm)
Side14mm@(14mm)
Rear14mm@(14mm)
Top4mm@90°(4mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 35 mm - Minimum 4 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 3750
 
 
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. 2pdr Blank
photo of Ordnance Q.F. 2pdr from Wikipedia
History
Used both as an Anti Tank gun and as a Tank gun the 2pdr was first used in Belgium in 1939. The majority of the British guns were captured by the Germans at Dunkirk and given their designation of 4.0 cm Pak 192(e) or 4.0 cm Pak 154(b). However the 2pdr manufacture was continued but was slowly replaced by the 6pdr from 1942.
Manufactured1936 - 1944
Calibre40mm
LengthL/50
Rate of Fire22 rpm
Number of Rounds 87
 
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP(AP)
40mm 1.08Kg 792M/Sec
Quoted Penetration 53mm@455m
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.13 0.27 0.56 1.26 2.17 3.37 5.06 7.58
Penetration(mm@30°) 64 58 51 41 33 25 19 13
Penetration(mm@0°) 74 67 59 48 39 30 22 16
Hit Probability(%) 98 98 98 93 60 25 6 2

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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