The Light Tank Mk VII ICS, it was based on the Light Tank chassis and was in use from 1940. It was commonly called a Tetrarch ICS. General Details (Light Tank) Specifications Operational Date(s) 1940 Ordnance classification Quantity Produced 0 Weight unknown Crew 3 M.G's small 1 M.G's large(>10mm) n/a Length 4.15 mtr Width 2.34 mtr Height 2.12 mtr Engine Details/Performance Max Road Speed 30 mph Max Cross Country Speed 28 mph Range Road 140 miles Range Cross Country unknown Fuel Type Unknown Fuel Capacity unknown Horse Power 120 hp Power/Weight unknown General Information The Light Tank Mk VII ICS, it was based on the Light Tank chassis and was in use from 1940. It was commonly called a Tetrarch ICS. It was armed with 1 light machine gun. Its main armament consisted of an Ordnance Q.F. 3inch Howitzer weighing 6.300 kg. The Light Tank MkVII Tetrarch was a completely new design for a light tank by Vickers, first used in 1942 then adopted for glider deployment by the Hamilcar glider. The rear engined 120hp engine drove the tracks under the four road wheels, past the rear idler and back over the road wheels. The turret was designed for the 3inch howitzer. Armour Details Turret Front 14mm @ 10° (14mm) Side 14mm @ 10° (14mm) Rear 14mm @ 10° (14mm) Top 4mm @ 90° (4mm) Superstructure Front 14mm @ 45° (20mm) Side 10mm @ 0° (10mm) Rear 10mm @ 0° (10mm) Top 5mm @ 90° (5mm) Hull Front 14mm @ 30° (16mm) Side 10mm @ 0° (10mm) Rear 10mm @ 0° (10mm) Top 5mm @ 90° (5mm) Armour (x)mm @ (y)° (Effective mm @ 0°) Effective Armour - Maximum 20 mm - Minimum 5 mm Weapon Details Ordnance Q.F. 3inch Howitzer (Field Gun) Manufactured unknown - 1945 Calibre 76.20mm Ammunition Details Name/Id Calibre Weight MVelocity Explosive Content 3 inch howitzer AP (HE High Explosive) 76.20mm 6.3Kg 650M/Sec 0.600Kg explosive Range(Mtr) 1000 2000 3000 4000 5000 6000 7000 8000 Flight Time(Secs) 1.69 3.67 5.94 8.46 11.2 14.13 17.2 20.39 lateral dispersion means the side to side variation of the shell from the aiming point 50%(CEP) of shells land within +/- (mtr) 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 80% of shells land within +/- (mtr) 95% of shells land within +/- (mtr) range dispersion means the back to front variation of the shell from the aiming point 50%(CEP) of shells land within +/- (mtr) 80% of shells land within +/- (mtr) 95% of shells land within +/- (mtr) Direct Fire Range(Mtr) 100 200 400 800 Flight Time(Secs) 0.16 0.32 0.65 1.36 Hit Probability(%) 93 93 90 77 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 15 mtr  Armour Penetration inc roof at 1 mtr 1 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 15 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 1 mm of the tank armour including the roof. 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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