Britain Cruiser Mk VI (Crusader III AA MkII) Ordnance classification - A15

The Cruiser Mk VI was designed in 1942, manufactured by Nuffield based on the existing fully tracked A13 III(Covenanter) and was in use from 1943 to 1945. General Details Specifications Operational Date(s) 1943 - 1945 Ordnance classification A15 Quantity Produced 5300 Weight 20 tonne Crew 5 M.G's small n/a M.G's large(>10mm) n/a Length 6.05 mtr Width 2.66 mtr Height 2.26 mtr Engine Details/Performance Max Road Speed 28 mph Max Cross Country Speed 15 mph Range Road 112 miles Range Cross Country 44 miles Fuel Type Petrol Fuel Capacity 120 gal Horse Power 340 hp Power/Weight 17 hp/tonne General Information The Cruiser Mk VI was designed in 1942, manufactured by Nuffield based on the existing fully tracked A13 III(Covenanter) and was in use from 1943 to 1945. The vehicle was powered by Nuffield 'Liberty' petrol powerplant producing 340 HP which could drive the vehicle on roads at up to 28 mph with a range of about 112 miles before refuelling. Its cross country performance was good providing a max speed of about 15 mph and a range of about 44 miles. Its main armament consisted of an Oerlikon 20mm L/70 which could penetrate 16 mm of flat plate at 100 metres The Crusader tank was a redesigned A13 Mk III as a heavy cruiser tank that could rapidly move and provide good A/T performance. The turret was a complex angular shape holding the twin Oerlikon 20mm guns in a high angle mount. The auxiliary machine gun turret was removed in this version. Armour Details Turret Front 49mm @ 7° (49mm) Side 24mm @ 45° (34mm) Rear 30mm @ 32° (35mm) Top 12mm @ 90° (12mm) Superstructure Front 30mm @ 38° (38mm) Side 14mm @ 0° (14mm) Rear 28mm @ 11° (29mm) Top 7mm @ 90° (7mm) Hull Front 20mm @ 60° (40mm) Side 14mm @ 0° (14mm) Rear 28mm @ 11° (29mm) Top 7mm @ 90° (7mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 49 mm - Minimum 7 mm Weapon Details Oerlikon 20mm L/70 History Maufactured in Switzerland the first British imports arrived in 1940, and subsequently manufactured under licence in Ruislip London later in 1940. Two versions were manufactured with different barrel lengths L/70 and L/85 which gave muzzle velocities of 820m/sec L70 and 1050m/sec L/85. The L/70 could deliver shells at 450rpm and the L/85 at 900-1000 rpm. Manufactured 1940 - Present Calibre 20mm Length L/70   Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content 20x110RB L/70(AP) 20mm 0.12Kg 820M/Sec Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.13 0.27 0.62 1.63 Penetration(mm@30°) 13 11 8 5 Penetration(mm@0°) 16 13 10 6 Hit Probability(%) 98 98 98 81

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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