The Ram Mk II, it was based on the fully tracked RAM chassis and was in use from 1942 to 1943. General Details (Medium Tank) Specifications Operational Date(s) 1942 - 1943 Ordnance classification Quantity Produced 1899 Weight unknown Crew 5 M.G's small 3 M.G's large(>10mm) n/a Length 5.85 mtr Width 2.79 mtr Height 2.69 mtr Engine Details/Performance Max Road Speed 25 mph Max Cross Country Speed 20 mph Range Road 144 miles Range Cross Country 57 miles Fuel Type Petrol Fuel Capacity 175 gal Horse Power 400 hp Power/Weight unknown General Information The Ram Mk II, it was based on the fully tracked RAM chassis 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 99 mm of flat plate at 400 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 Front 87mm @ 47° (128mm) Side 63mm @ 5° (63mm) Rear 51mm @ 5° (51mm) Top 22mm @ 90° (22mm) Superstructure Front 87mm @ 45° (123mm) Side 63mm @ 0° (63mm) Rear 38mm @ 0° (38mm) Top 13mm @ 87° (13mm) Hull Front 87mm @ 45° (123mm) Side 63mm @ 0° (63mm) Rear 38mm @ 0° (38mm) Top 13mm @ 87° (13mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 128 mm - Minimum 13 mm Weapon Details Ordnance Q.F. 6pdr 7cwt MKI-III (Anti Tank Gun) 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. Manufactured 1942 - 1945 Calibre 57mm Length L/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) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.12 0.24 0.49 1.03 1.61 2.24 2.91 3.62 Penetration(mm@30°) 95 92 85 74 64 56 48 42 Penetration(mm@0°) 110 106 99 86 75 65 56 49 Hit Probability(%) 88 88 88 79 61 49 34 13 About Penetration Figures All penetration figures in this database are calculated to a common standard based on German WWII testing criteria (complete penetration with functioning fuze). This allows direct comparison between all nations' guns. Original national test figures would be higher for some nations due to different criteria: German: 1.00? (baseline - strictest) British: 1.02? (slightly looser) American: 1.05? (50% mass through plate) Soviet: 1.10? (75% mass through plate) For example, a Soviet gun showing 159mm here would be published as ~175mm in Soviet documents, and a German gun showing 120mm would be published as 120mm in German documents. The 159mm figure is directly comparable to the German 120mm - the Soviet gun really was more powerful. National Testing Standards German: 1.00? - Complete penetration, fuze functions (strictest) British: 1.02? - Complete penetration American: 1.05? - 50% of shell mass through plate Soviet: 1.10? - 75% of shell mass through plate All database figures are normalized to German standard for direct comparison. Multiply by the factor above to see original national test figures.

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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