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Britain
Inf Tank Mk IV (Churchill 1 - I)
Ordnance classification - A22

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The Inf Tank Mk IV was designed in 1940, manufactured by Vauxhall Motors based on the existing fully tracked Churchill and was in use from 1941 to 1941.

Photo of Inf Tank Mk IV (Churchill  1 - I)
Inf Tank Mk IV(Churchill  1 - I) scale illustration

General Details
Specifications
Operational Date(s)1941 - 1941
Ordnance classificationA22
Quantity Produced303
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 1940, manufactured by Vauxhall Motors based on the existing fully tracked Churchill and was in use from 1941 to 1941.

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 good 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 48 mm of flat plate at 800 metres Its main armament consisted and an Ordnance Q.F. 3inch Howitzer which could penetrate 102 mm of flat plate at 800 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 Mk I had a hull mounted 3inch howitzer to the right of the driver .

Armour Details
Turret
Front152mm@(152mm)
Side95mm@(95mm)
Rear95mm@(95mm)
Top20mm@90°(20mm)
Superstructure
Front152mm@20°(162mm)
Side95mm@(95mm)
Rear50mm@(50mm)
Top19mm@90°(19mm)
Hull
Front50mm@70°(146mm)
Side95mm@(95mm)
Rear50mm@(50mm)
Top19mm@90°(19mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 162 mm - Minimum 19 mm



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
 
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


Weapon Details
Flag
Ordnance Q.F. 3inch Howitzer Blank
Manufacturedunknown - 1945
Calibre76.20mm
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP(AP)
76.20mm 7.65Kg 650M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.16 0.32 0.65 1.38 2.19 3.12 4.17 5.39
Penetration(mm@30°) 118 109 100 88 77 66 57 48
Penetration(mm@0°) 137 127 116 102 89 77 66 56
Hit Probability(%) 98 98 98 90 60 25 15 6

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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