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Canada
Cruiser Mk VIII (Cromwell II) (Cromwell II)

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The Cruiser Mk VIII (Cromwell II) based on the existing Cromwell and was in use from 1943.

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General Details
Specifications
Operational Date(s)1943
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 Speed40 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 II) based on the existing Cromwell and was in use from 1943.

It was armed with 1 light machine gun. Its main armament consisted of an Ordnance Q.F. 6pdr 7cwt MKI-III which could penetrate 105 mm of flat plate at 100 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 II had modifications to improve cross country performance with wider tracks than the Mk I, the hull machine gun was removed to increase ammunition storage.

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. 6pdr 7cwt MKI-III
(Anti Tank Gun)
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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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