QF 12-pounder 18 cwt naval gun
| Ordnance QF 12-pounder 18 cwt | |
|---|---|
Deployed as anti-aircraft gun on HMS Agamemnon off Salonika, 1916 | |
| Type | Naval gun, Coastal defence |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1906–1921? |
| Used by | Royal Navy |
| Wars | World War I |
| Production history | |
| Designer | Elswick Ordnance Company |
| Designed | 189? |
| Specifications | |
| Mass | Gun & breech: 2,016 lb (914 kg) |
| Barrel length | Bore: 150-inch (3.81 m) (50 calibres) |
| Shell | Separate QF 12.5 lb (5.66 kg) |
| Calibre | 3 in (76 mm) |
| Rate of fire | 20 rd/min |
| Muzzle velocity | 2,600 ft/s (790 m/s) |
| Effective firing range | 9,300 yards @ +20° (8,500 m @ +20°) |
The QF 12 pounder 18 cwt gun (Quick-Firing) was a 3-inch high-velocity naval gun used to equip larger British warships such as battleships for defence against torpedo boats. 18 cwt referred to the weight of gun and breech (18 × 112 lb = 2,016 lb or 914 kg), to differentiate the gun from others that also fired the "12 pound" (actually 12.5 lb or 5.7 kg) shell.