QF 4-inch naval gun Mk XXIII explained

Ordnance QF 4 inch gun Mk XXIII
Origin:United Kingdom
Type:Submarine deck gun
Is Ranged:yes
Is Artillery:yes
Is Uk:yes
Service:1945-1974
Used By:United Kingdom
Wars:Indonesia–Malaysia confrontation
Cold War
Production Date:1945-46
Number:31
Weight:1568lb barrel and breech
Length:137.63NaN3
Part Length:132.23NaN3 bore (33 calibres)
Cartridge:Fixed QF 351NaN1
38.51NaN1
Caliber:40NaN0
Rate:about 15 rounds per minute
Velocity:35 lb: 1791ft/s
38.5 lb: 1745ft/s
Max Range:12080yd 35 lb HE shell at 30 degrees:
Breech:horizontal sliding-block
Carriage:4-0 Inch SII Mounting
Elevation:-10 to +30 degrees
Traverse:360 degrees[1]

The QF 4-inch gun Mark XXIII was introduced in late 1945 as a deck gun for Royal Navy submarines. It was the last type of gun to be fitted to British submarines, finally being retired in 1974.

Development and service

Development of the Mark XXIII began in 1942, as a lighter replacement for the QF 4-inch gun Mark XXII, which was based on a gun introduced in 1911. It was too late to see service in World War II, but was fitted to Amphion-class submarines that completed after October 1945.[2] It was also fitted to some T-class submarines.

Between 1955 and the early 1960s, the Amphion-class boats were modernised with new streamlined conning towers and casings. This work included the removal of the deck gun, although the underlying supports for the gun mountings were retained in case they were required. This facility was put to use during the British involvement in the Indonesia–Malaysia confrontation from 1962 to 1966, when the flotilla of Amphion-class submarines which were deployed in the conflict were again fitted with Mark XXIII guns. These were used to counter blockade-running Indonesian junks and other small vessels.[3] HMS Andrew retained her gun into the 1970s; the last firing was on 2 December 1974.

Surviving examples

Very few Mark XXIII guns and their respective SII mountings were produced (only 31 in total), and only two are known to still exist today:

HMS Andrew's Mark XXIII gun is preserved at the Royal Navy Submarine Museum, Gosport.[4]

External links

Notes and References

  1. Web site: Britain - 4"/33 (10.2 cm) QF Mark XXIII . 22 October 2008 . www.navweaps.com . Tony DiGiulian . 21 March 2014.
  2. Web site: Naval Weapons, Equipment, Fittings & Boats. . Lambert . John . www.feralchicken.co.uk/lambert-plans/ . John Lambert Plans . 21 March 2014.
  3. Akermann, Paul (2002), Encyclopedia of British Submarines 1901-1955, Periscope Publishing Limited, (pp. 426-427)
  4. Web site: Royal Navy Submarine Museum . Whitman . Edward C . Summer 2003 . www.navy.mil . Undersea Warfare - The Official Magazine of the U.S. Submarine Force . 21 March 2014.