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Canada
Ram Mk II

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The Ram Mk II based on the existing fully tracked RAM and was in use from 1942 to 1943.

Flag of World War 2 Canada

General Details
Specifications
Operational Date(s)1942 - 1943
Ordnance classification
Quantity Produced1899
Weightunknown
Crew5
M.G's small3
M.G's large(>10mm)n/a
Length5.85 mtr
Width2.79 mtr
Height2.69 mtr
Engine Details/Performance
Max Road Speed25 mph
Max Cross Country Speed20 mph
Range Road144 miles
Range Cross Country57 miles
Fuel TypePetrol
Fuel Capacity175 gal
Horse Power400 hp
Power/Weightunknown
General Information
The Ram Mk II based on the existing fully tracked RAM and was in use from 1942 to 1943.

It was armed with 3 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 Ram II Cruiser tank was developed by the Canadians utilising the engine and drive chain from the American M3 Grant with a cast upper hull and turret together with a number of improvements over the Ram I. The Ram II was armed with the originally designed 6pdr gun, the earlier Ram I had to make do with the 2pdr gun as the 6pdr wasn't available at the time. 1899 of these vehicles were produced between early 1942 and 1943 by the Montreal Locomotive Works, most of which were again shipped to England as were the Ram I vehicles. The vehicle transmission sprocket was at the front, the track passed under 6 road wheels on three bogies to the rear idler, then return via 3 return rollers.

Armour Details
Turret
Front87mm@47°(128mm)
Side63mm@(63mm)
Rear51mm@(51mm)
Top22mm@90°(22mm)
Superstructure
Front87mm@45°(123mm)
Side63mm@(63mm)
Rear38mm@(38mm)
Top13mm@87°(13mm)
Hull
Front87mm@45°(123mm)
Side63mm@(63mm)
Rear38mm@(38mm)
Top13mm@87°(13mm)
Armour (x)mm @ (y)° (Effective mm @ 0°)
Effective Armour - Maximum 128 mm - Minimum 13 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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