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Canada
Cruiser Mk VIII (Cromwell IV) (Cromwell IV)

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The Cruiser Mk VIII (Cromwell IV) based on the existing Cromwell and was in use from 1944.

Flag of World War 2 Canada

General Details
Specifications
Operational Date(s)1944
Ordnance classification
Quantity Produced0
Weightunknown
Crew5
M.G's small1
M.G's large(>10mm)n/a
Length6.40 mtr
Width2.92 mtr
Height2.49 mtr
Engine Details/Performance
Max Road Speed38 mph
Max Cross Country Speed18 mph
Range Road173 miles
Range Cross Countryunknown
Fuel TypePetrol
Fuel Capacity139 gal
Horse Power600 hp
Power/Weightunknown
General Information
The Cruiser Mk VIII (Cromwell IV) based on the existing Cromwell and was in use from 1944.

It was armed with 1 light machine gun. Its main armament consisted of an Ordnance Q.F. 75mm which could penetrate 106 mm of flat plate at 200 metres

The Cromwell tank was designed as a heavy cruiser tank that could rapidly move and provide good A/T performance, in appearance it looked like the Cavalier.

The vehicle had a rear Rolls Royce Meteor engine producing 600hp driving the tracks, towards the main front idler over the 5 large road wheels, round the idler and back under the roadwheels in the standard Christie style.

The Mark IV was a Centaur Mk III with the 75mm gun in the turret and the Meteor engine added.

Armour Details
Turret
Front76mm@(76mm)
Side63mm@(63mm)
Rear57mm@(57mm)
Top20mm@81°(20mm)
Superstructure
Front63mm@(63mm)
Side32mm@(32mm)
Rear32mm@(32mm)
Top20mm@90°(20mm)
Hull
Front57mm@(57mm)
Side32mm@(32mm)
Rear32mm@(32mm)
Top20mm@90°(20mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 76 mm - Minimum 20 mm



Weapon Details
Flag
Ordnance Q.F. 75mm
(Tank Gun)
Blank
photo of Ordnance Q.F. 75mm from Wikipedia
History
This was a temporary fix to the problem of 6pdr guns not having a powerful enough HE shell. It was created by boring out the British 57mm 6pdr to take the American 75mm AP/HE shells, which reduced the Anti Tank performance but provided HE support.
Manufactured1943 - 1945
Calibre75mm
LengthL/32
 
Ammunition Details
Name/Id Calibre Weight MVelocity Explosive Content
AP M72 U.S.
(AP Armor Piercing)
75mm 6.58Kg 618M/Sec
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.16 0.33 0.68 1.45 2.31 3.29 4.41 5.71
Penetration(mm@30°) 98 91 83 73 64 55 46 38
Penetration(mm@0°) 114 106 96 85 74 64 54 45
Hit Probability(%) 98 98 98 88 54 25 15 3



HE M48
(HE High Explosive)
75mm 6.76Kg 625M/Sec 0.680Kg explosive
Maximum Range not shown as gun elevation is limited
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.16 0.33 0.68 1.43 2.29 3.25 4.36 5.65
Direct Fire
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.16 0.33 0.68 1.43 2.29 3.25 4.36 5.65
Hit Probability(%) 98 98 98 88 57 25 15 3
Blast/Fragmentation Effects
Burst radius Infantry in open 99% kill3 mtr Burst radius Infantry in open 66% kill6 mtr
Burst radius Infantry in open 33% kill16 mtr  Armour Penetration inc roof at 1 mtr2 mm
An explosion within 3 mtr of infantry in the open will cause 99% casualties - lethal.
An explosion within 6 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's.
An explosion within 16 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 2 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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