A light weight gun for submarines. Developed too late for service during World War II.
Constructed with a monobloc loose barrel and breech ring. The bore and external parallel section were nickel plated and zinc protective plates were on the breech ring and horizontal sliding breech block. A total of thirty-one guns were manufactured. Actual bore length was 33.04 calibers.
Designation | 4"/33 (10.2 cm) QF Mark XXIII |
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Ship Class Used On | A class and a few T class submarines |
Date Of Design | about 1944 |
Date In Service | 1946 |
Gun Weight | 0.7 tons (0.76 mt) |
Gun Length oa | 137.6 in (3.495 m) |
Bore Length | 132.2 in (3.358 m) |
Rifling Length | N/A |
Grooves | N/A |
Lands | N/A |
Twist | N/A |
Chamber Volume | 183 in3 (3.00 dm3) |
Rate Of Fire | about 15 rounds per minute |
Type | Fixed |
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Projectile Types and Weights | HE: 35 lbs. (15.9 kg) HE: 38.5 lbs. (17.5 kg) |
Bursting Charge | N/A |
Projectile Length | N/A |
Propellant Charge | 3.75 lbs. (1.7 kg) NF052 3.88 lbs. (1.8 kg) NF052 |
Muzzle Velocity | For 35 lbs. (15.9 kg): 1,791 fps (546 mps) For 38.5 lbs. (17.5 kg): 1,745 fps (532 mps) |
Working Pressure | N/A |
Approximate Barrel Life | N/A |
Ammunition stowage per gun | N/A |
Data from:
- "British Naval Guns 1880-1945 No 18" article by John Campbell in "Warship Volume X"
Special help by Rod Butcher
- 22 October 2008
- Benchmark
- 12 February 2012
- Updated to latest template
- 29 November 2015
- Changed Vickers Photographic Archive links to point at Wayback Archive