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Canada
Ram Mk I

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The Ram Mk I based on the existing fully tracked RAM and was in use from 1941 to 1942.

Flag of World War 2 Canada

General Details
Specifications
Operational Date(s)1941 - 1942
Ordnance classification
Quantity Produced50
Weightunknown
Crew5
M.G's small3
M.G's large(>10mm)n/a
Length5.85 mtr
Width2.90 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 I based on the existing fully tracked RAM and was in use from 1941 to 1942.

It was armed with 3 light machine guns. Its main armament consisted of an Ordnance Q.F. 2pdr which could penetrate 67 mm of flat plate at 200 metres

The Ram I Cruiser tank was developed by the Canadians utilising the engine and drive chain from the American M3 Grant with a new cast upper hull and turret. Originally designed to take the 6pdr gun, these early models had a 2pdr gun as the 6pdr wasn't available in time. Fifty of these vehicles were produced between Autumn 1941 and early 1942 by the Montreal Locomotive Works, most of which were shipped to England. 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. 2pdr
(Anti Tank Gun)
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. 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/T Mk I
(AP Armor Piercing)
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



HE/T Mk II after 1942
(HE High Explosive)
40mm 0.86Kg 792M/Sec 0.085Kg explosive
Maximum Range not shown as gun elevation is limited
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.13 0.27 0.56 1.26 2.17 3.37 5.06 7.59
Direct Fire
Range(Mtr)1002004008001200160020002400
Flight Time(Secs) 0.13 0.27 0.56 1.26 2.17 3.37 5.06 7.59
Hit Probability(%) 98 98 98 93 60 25 6 2
Blast/Fragmentation Effects
Burst radius Infantry in open 99% kill1 mtr Burst radius Infantry in open 66% kill3 mtr
Burst radius Infantry in open 33% kill9 mtr  Armour Penetration inc roof at 1 mtr0 mm
An explosion within 1 mtr of infantry in the open will cause 99% casualties - lethal.
An explosion within 3 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's.
An explosion within 9 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 not cause any significant armour damage.

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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