This weapon was specifically developed for the submarine X 1, which was the British version of the "submarine cruiser." These were submarines with large-caliber armament built by Germany during World War I and by other nations during the 1920s. None of these boats were very successful.
For the X 1, the design concept was that she should be able sink or disable a destroyer at 6,000 yards (5,500 m) with her guns alone. In practice, this was unlikely, as the low height above the water of the range finding equipment and the unsteady nature of a submarine made this craft unsuitable as a gun platform. This was the only gun of this caliber built by the British and was considered to be reliable once the initial problems had been overcome.
Consisted of tapered inner A tube, A tube, partial jacket, and breech ring. Used a horizontal sliding, hand operated breech block with semi-automatic opening. A total of six guns were built.
|Designation||5.2"/42 (13.2 cm) QF Mark I|
|Ship Class Used On||X 1|
|Date Of Design||About 1921|
|Date In Service||1924|
|Gun Weight||3.425 tons (3.48 mt)|
|Gun Length oa||230.65 in (5.859 m)|
|Bore Length||218.4 in (5.547 m)|
|Chamber Volume||630 in3 (10.32 dm3)|
|Rate Of Fire||6 rounds per minute|
|Projectile Types and Weights||HE: 70 lbs. (31.8 kg)|
|Propellant Charge||10.78 lbs. (4.9 kg) MC 16
11.36 lbs. (5.2 kg) SC 109
|Muzzle Velocity||2,300 fps (701 mps)|
|Approximate Barrel Life||N/A|
|Ammunition stowage per gun||100 rounds|
|Elevation||-5 / +40 degrees|
|Elevation Rate||Manually operated, only|
|Train||about -150 / +150 degrees|
|Train Rate||Manually operated, only|
Special ballast tanks were fitted which compensated for the loss of weight as the ammunition was fired.
Gunnery crew was 58 out of a total complement of 109.