QF 13-pounder Mk IV AA gun
QF 13 pounder Mk IV anti-aircraft gun | ||
---|---|---|
Breech Nordenfelt eccentric screw | | |
Recoil | Hydro-spring | |
Carriage | high-angle mounting on lorry | |
Elevation | 0° - 85°[1] | |
Traverse | 360° | |
Muzzle velocity | 1,600 ft/s (490 m/s) approx.[1] |
The Ordnance QF 13-pounder Mk IV anti-aircraft gun was an Elswick Ordnance commercial 3 inch 13-pounder gun of which 6 were supplied during World War I. It is unrelated to other British Mks of 13-pounder.
History
It is visibly identified by having 2 recoil/recuperator cylinders above the barrel. The cylinder immediately above the barrel is slightly shorter than the barrel, and the top cylinder is slightly longer than the barrel. The overall appearance is of a standard 13-pounder with an additional, slightly longer, recuperator cylinder on top. The gun breech also differed from standard British practise, in that it used a Nordenfelt breech similar to that of the French 75, but inverted : the breech was opened and closed by rotating it about an axis near the top of the barrel, which uncovered and covered the slot for entering the cartridge, rather than unscrewing and swinging it out as with the typical British Welin or Asbury breech.
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Notes
See also
References
- I.V. Hogg & L.F. Thurston, British Artillery Weapons & Ammunition 1914–1918. London:Ian Allan, 1972.
- Brigadier NW Routledge, History of the Royal Regiment of Artillery. Anti-Aircraft Artillery, 1914-55. London: Brassey's, 1994
Surviving examples
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