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Canada
Inf Tank Mk IV (Churchill 2 - II)
Ordnance classification - A22

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The Inf Tank Mk IV was designed in 1941, manufactured by Vauxhall Motors based on the existing fully tracked Churchill and was in use from 1941 to 1945.

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Photo of Inf Tank Mk IV (Churchill  2 - II)
Inf Tank Mk IV(Churchill  2 - II) scale illustration

General Details
Specifications
Operational Date(s)1941 - 1945
Ordnance classificationA22
Quantity Produced1127
Weight38.5 tonne
Crew5
M.G's small2
M.G's large(>10mm)n/a
Length7.51 mtr
Width3.28 mtr
Height2.49 mtr
Engine Details/Performance
Max Road Speed16 mph
Max Cross Country Speed8 mph
Range Road90 miles
Range Cross Country36 miles
Fuel TypePetrol
Fuel Capacity190 gal
Horse Power350 hp
Power/Weight9 hp/tonne
General Information
The Inf Tank Mk IV was designed in 1941, manufactured by Vauxhall Motors based on the existing fully tracked Churchill and was in use from 1941 to 1945.

The vehicle was powered by Bedford '350HP' petrol powerplant producing 350 HP which could drive the vehicle on roads at up to 16 mph with a range of about 90 miles before refuelling. Its cross country performance was adequate providing a max speed of about 8 mph and a range of about 36 miles.

It was armed with 2 light machine guns. Its main armament consisted of an Ordnance Q.F. 2pdr which could penetrate 67 mm of flat plate at 200 metres

The Churchill Infantry tank was designed as a tank that could cope with movement through heavily shelled areas, and provide adequate protection for the crew.

The vehicle was layed out in a similar way to the tanks from the First World War with the rear Bedford 350hp engine driving the tracks, to the front via small idlers to the fron main idler, then via 11small sprung road wheels. The first vehicles had many mechanical faults and hence many subsequent modifications.

The turret contained the 2pdr gun and the 3 inch howitzer in the hull front on the A22 was replaced by a besa machine gun.

Armour Details
Turret
Front88mm@(88mm)
Side76mm@(76mm)
Rear89mm@(89mm)
Top16mm@90°(16mm)
Superstructure
Front88mm@20°(94mm)
Side76mm@(76mm)
Rear50mm@(50mm)
Top16mm@90°(16mm)
Hull
Front38mm@70°(111mm)
Side76mm@(76mm)
Rear50mm@(50mm)
Top16mm@90°(16mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 111 mm - Minimum 16 mm



Weapon Details
Flag
Ordnance Q.F. 2pdr
(Anti Tank Gun)
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. However the 2pdr manufacture was continued but was slowly replaced by the 6pdr from 1942.
Manufactured1936 - 1944
Calibre40mm
LengthL/50
Rate of Fire22 rpm
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP/T Mk I
(AP Armor Piercing)
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



HE/T Mk II after 1942
(HE High Explosive)
40mm 0.86Kg 792M/Sec 0.085Kg explosive
Maximum Range not shown as gun elevation is limited
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.13 0.27 0.56 1.26 2.17 3.37 5.06 7.59
Direct Fire
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.13 0.27 0.56 1.26 2.17 3.37 5.06 7.59
Hit Probability(%) 98 98 98 93 60 25 6 2
Blast/Fragmentation Effects
Burst radius Infantry in open 99% kill1 mtr Burst radius Infantry in open 66% kill3 mtr
Burst radius Infantry in open 33% kill9 mtr  Armour Penetration inc roof at 1 mtr0 mm
An explosion within 1 mtr of infantry in the open will cause 99% casualties - lethal.
An explosion within 3 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's.
An explosion within 9 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 not cause any significant armour damage.

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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