Britain Ordnance Q.F. 3inch 20cwt AA

Showing the details of the shells used(where known)   Tweet Weapon Details Ordnance Q.F. 3inch 20cwt AA (Field Gun) Manufactured 1914 - 1944 Calibre 76.20mm Length L/45 QF 3-inch 20 cwt (HE High Explosive) 76.20mm 7.26Kg 610M/Sec ≈1.089Kg explosive Maximum Range 6700 Mtr Range(Mtr) 1000 2000 3000 4000 5000 6000 7000 8000 Flight Time(Secs) 1.89 4.45 8.11 13.81 23.85 46.29 141.17 Direct Fire Range(Mtr) 100 200 400 800 1200 1600 2000 2400 Flight Time(Secs) 0.17 0.34 0.69 1.47 2.34 3.32 4.45 5.74 Hit Probability(%) 98 98 98 88 54 25 15 3 Blast/Fragmentation Effects Burst radius Infantry in open 99% kill 4 mtr Burst radius Infantry in open 66% kill 8 mtr Burst radius Infantry in open 33% kill 20 mtr  Armour Penetration inc roof at 1 mtr 3 mm An explosion within 4 mtr of infantry in the open will cause 99% casualties - lethal. An explosion within 8 mtr of infantry in the open will cause > 66% casualties and could damage some AFV's. An explosion within 20 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 3 mm of the tank armour including the roof. Vehicles in our database using this gun Vehicle Name Common Name   Carrier Churchill 3 inch Gun Mk I (A22D)

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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