| BL 5.5-inch Mark I | |
|---|---|
 | |
| Type | Naval gun, Coastal defence |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1913–1954 |
| Wars | World War I World War II |
| Production history | |
| Designer | Coventry Ordnance Works |
| Designed | 1913 |
| Manufacturer | Coventry Ordnance Works |
| No. built | 81 |
| Specifications | |
| Mass | 13,955 lbs (6,330 kg)[2] |
| Length | 275 inches (7.0 m) L/50 |
| Shell | 82 pounds (37.19 kg) |
| Calibre | 5.5-inch (140 mm) |
| Breech | Welin breech block with Holmstrom mechanism[3] |
| Elevation | -7 degrees to +30 degrees depending on mount[2] |
| Rate of fire | 12 rounds per minute |
| Muzzle velocity | 2,790 f/s (850 m/s)[2] |
| Effective firing range | 17,800 yards (16,300 m) at 30-degree elevation |
The Breech Loading 5.5-inch Mk I was a naval gun used by the British Royal Navy during both World Wars.
- ^ Imperial War Museum (2012). "Naval BL 5.5 in Mk I Gun with Mk I pedestal mount". Imperial War Museum Collections Search. Retrieved 6 February 2012.
- ^ a b c Campbell, Naval Weapons of WWII, p.40.
- ^ Di Giulian
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