Ordnance QF 20 pounder
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|Ordnance QF 20 pounder Mark I|
|Place of origin||United Kingdom|
|Used by||United Kingdom
Six Day War
South African Border War
|Length||226.4 in (5.75 m)|
|Shell||20 pounds (9.07 kg)|
|Calibre||84 millimetres (3.31 in)|
|Elevation||+18 to -10 in Centurion Mk 5|
Design and Development
The gun was developed by the Royal Ordnance Factories.
As fitted to the Charioteer, it ran through two models:
- Model A without a fume extractor.
- Model B with a fume extractor.
The gun was fitted predominantly to the Centurion tank, seeing action with British and Australian forces.
The 20 pounder's APCBC projectile had an initial muzzle velocity of 1,020 metres per second and could penetrate 210mm of rolled homogeneous armour (RHA). However, these conventional rounds were rarely used.
- Pugh, p.34; the gun is specified as 83.4 mm (3.283 in) here, while Ogorkiewiecz states the weapon was 83.8 mm. Norman gives it as "3.3 inch (84 mm)"
- Ogorkiewicz, p. 70.
- *Ford, Roger (1997). The World's Great Tanks from 1916 to the present day. Brown Packaging Books Ltd. p. 121. ISBN 1-897884-29-X.
- British Anti-Tank Gunnery Data at www.figuras.miniatures.de
- Dunstan, p. 10, notes the 20 pounder's APDS round had twice the penetration capability of an 8.8 cm AP round.
- Norman p12
- Dunstan, Simon. Centurion Universal Tank 1943-2003, Oxford: Osprey Publishing, 2003. ISBN 1-84176-387-X.
- Ogorkiewicz, Richard. Technology of Tanks, London: Jane's Information Group, Ltd., 1991. ISBN 0-7106-0595-1.
- Pugh, Stevenson (1962). Fighting Vehicles and Weapons of the Modern British Army. Macdonald & Co. OCLC 10010960.
- Norman, Michael. Armour in Profile No. 23 Centurion 5. Surrey: Profile Publications.
- Pounds as a measure of cannon bore
- British standard ordnance weights and measurements
- Ordnance QF 32-pounder
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