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Britain
Ordnance Q.F. 3inch 20cwt AA

Showing the details of the shells used(where known)
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Weapon Details
Ordnance Q.F. 3inch 20cwt AA
(Field Gun)
Blank
Manufactured1914 - 1944
Calibre76.20mm
LengthL/45
QF 3-inch 20 cwt
(HE High Explosive)
76.20mm 7.26Kg 610M/Sec ≈1.089Kg explosive
Maximum Range 6700 Mtr
Range(Mtr)10002000300040005000600070008000
Flight Time(Secs) 1.89 4.45 8.11 13.81 23.85 46.29 141.17
Direct Fire
Range(Mtr)1002004008001200160020002400
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% kill4 mtr Burst radius Infantry in open 66% kill8 mtr
Burst radius Infantry in open 33% kill20 mtr  Armour Penetration inc roof at 1 mtr3 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 NameCommon 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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