Britain
Inf Tank Mk III (Valentine XI)

Tweet The Inf Tank Mk III was designed in 1939 based on the existing fully tracked Valentine and was in use from 1944 to 1945. General Details Specifications Operational Date(s) 1944 - 1945 Quantity Produced 0 Weight 17.2 tonne Crew 4 M.G's small 1 M.G's large(>10mm) n/a Length 5.46 mtr Width 2.65 mtr Height 2.31 mtr Engine Details/Performance Max Road Speed 15 mph Max Cross Country Speed 8 mph Range Road 0 miles Range Cross Country unknown Fuel Type Diesel Fuel Capacity unknown Horse Power 210 hp Power/Weight 12 hp/tonne General Information The Inf Tank Mk III was designed in 1939 based on the existing fully tracked Valentine and was in use from 1944 to 1945. It was armed with 1 light machine gun. Its main armament consisted of an Ordnance Q.F. 75mm which could penetrate 96 mm of flat plate at 400 metres The Infantry tank MkIII the Valentine was a redesigned A10 to provide an infantry support tank which could move slowly with the infantry to provide AT and machine gun support. The turret had power traverse with a 75mm A/T gun. The armour was good for this size of vehicle. The Valentine X was designed with a 75mm gun turret. Armour Details Turret Front 65mm @ 0° (65mm) Side 60mm @ 0° (60mm) Rear 60mm @ 0° (60mm) Top 10mm @ 90° (10mm) Superstructure Front 30mm @ 68° (80mm) Side 60mm @ 0° (60mm) Rear 60mm @ 0° (60mm) Top 10mm @ 90° (10mm) Hull Front 60mm @ 21° (64mm) Side 60mm @ 0° (60mm) Rear 60mm @ 0° (60mm) Top 10mm @ 90° (10mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 80 mm - Minimum 10 mm Weapon Details Ordnance Q.F. 75mm (Tank Gun) History This was a temporary fix to the problem of 6pdr guns not having a powerful enough HE shell. It was created by boring out the British 57mm 6pdr to take the American 75mm AP/HE shells, which reduced the Anti Tank performance but provided HE support. Manufactured 1943 - 1945 Calibre 75mm Length L/32   Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content AP M72 U.S. (AP Armor Piercing) 75mm 6.58Kg 618M/Sec Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.16 0.33 0.68 1.45 2.31 3.29 4.41 5.71 Penetration(mm@30°) 98 91 83 73 64 55 46 38 Penetration(mm@0°) 114 106 96 85 74 64 54 45 Hit Probability(%) 98 98 98 88 54 25 15 3 HE M48 (HE High Explosive) 75mm 6.76Kg 625M/Sec 0.680Kg explosive Maximum Range not shown as gun elevation is limited Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.16 0.33 0.68 1.43 2.29 3.25 4.36 5.65 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.16 0.33 0.68 1.43 2.29 3.25 4.36 5.65 Hit Probability(%) 98 98 98 88 57 25 15 3 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 3 mtr Burst radius Infantry in open 66% kill 6 mtr Burst radius Infantry in open 33% kill 16 mtr  Armour Penetration inc roof at 1 mtr 2 mm An explosion within 3 mtr of infantry in the open will cause 99% casualties - lethal. An explosion within 6 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. An explosion within 16 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 penetrate 2 mm of the tank armour including the roof.

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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