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Britain
Inf Tank Mk IV (Churchill 3 - III)
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 1942 to 1945.

Flag of World War 2 Britain
Photo of Inf Tank Mk IV (Churchill  3 - III)
Inf Tank Mk IV(Churchill  3 - III) scale illustration

General Details
Specifications
Operational Date(s)1942 - 1945
Ordnance classificationA22
Quantity Produced675
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 1942 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. 6pdr 7cwt MKI-III which could penetrate 96 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 this version was armed with the 6pdr gun.

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 II had a hull mounted machine gun to the right of the driver to replace the 3inch howitzer in the Mk I.

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. 6pdr 7cwt MKI-III
(Anti Tank Gun)
Blank
photo of Ordnance Q.F. 6pdr 7cwt MKI-III from Wikipedia
History
The 6pdr Mk II—differed from the pre-production Mk I in having a shorter L/43 barrel, because of shortage of suitable lathes. The subsequent Mk IV was fitted with an L/50 barrel, with muzzle brake.
Manufactured1942 - 1945
Calibre57mm
LengthL/43
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
Shot, AP, Mks 1 to 7
(AP Armor Piercing)
57mm 2.86Kg 853M/Sec
Quoted Penetration 68mm@915m
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.12 0.24 0.5 1.09 1.78 2.61 3.61 4.86
Penetration(mm@30°) 90 83 74 63 53 44 35 28
Penetration(mm@0°) 105 96 86 73 62 51 41 33
Hit Probability(%) 98 98 98 98 77 41 22 8

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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