This was an experimental weapon developed in the early 1930s to test "all-steel" construction techniques. It was the first British heavy gun to be designed for a cast steel cylindrical cradle. This design would probably have been used on new British battleships if any of the Naval Limitation Treaties of the 1930s had limited gun caliber to 12 inches (30.5 cm).
Constructed of tapered inner A tube, A tube, jacket, breech ring with breech bush and shrunk collar. Used a Welin breech block with Asbury breech mechanism.
|Designation||12"/50 (30.5 cm) Mark XIV|
|Ship Class Used On||Experimental Gun|
|Date Of Design||1930|
|Date In Service||1933 (as experimental gun)|
|Gun Weight||50.5 tons (51.3 mt)|
|Gun Length oa||618 in (14.697 m)|
|Bore Length||600 in (15.240 cm)|
|Chamber Volume||14,583 in3 (239 dm3)|
|Rate Of Fire||about 2 rounds per minute|
|Projectile Types and Weights||APC - 950 lbs. (430.9 kg)|
(see Note 2)
|226 lbs. (102.5 kg) SC280|
|Muzzle Velocity||2,652 fps (808 mps)|
|Approximate Barrel Life||N/A|
|Ammunition stowage per gun||N/A (probably about 100 rounds)|
Trial shells were 6/[infinity] crh.
|Designation||Two and Three-gun Mountings|
|Elevation||-5 / +40 degrees|
|Rate of Elevation||N/A|
|Train||About -150 / +150 degrees|
|Rate of Train||N/A|
|Loading Angle||+5 degrees|
During the late 1920s preliminary estimates were drawn up for ships armed with eight or nine 12 inch (30.5 cm) guns. Detailed plans for a three-gun turret were drawn up by Vickers-Armstrong in the early 1930s but none were ordered.