Mk.38 5″ /38 Twin Gun Mount (Metal Barrel)


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5-inch/38-caliber gun

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5"/38 caliber gun
Forward gun turrets of USS David W. Taylor (DD-551) at Hunters Point Naval Shipyard, California (USA), on 23 April 1945.jpg

Two Mk 30 single enclosed base ring mounts on USS David W. Taylor
TypeDeck Gun
Place of originUnited States
Service history
In service1934–2008
Used byUnited States NavyUnited States Coast GuardRoyal NavyDanish NavyItalian NavyJapan Maritime Self-Defense ForceSouth Vietnamese Navy, and every navy that bought surplus World War II, US Navy warships
WarsWorld War IIKorean WarVietnam WarGulf WarFalklands War, and wars that involved navies who bought surplus World War II, US Navy warships
Production history
MassMk 12 Gun Assembly: 3,990 lb (1,810 kg). Mounts varied from 29,260 lb (13,270 kg) to 170,653 lb (77,407 kg)
LengthMk 12 Gun Assembly: 223.8 in (5.68 m)
Barrel length190 in (4.83 m) bore, 157.2 in (3.99 m) rifling
CrewVaried on mount type

53 to 55 lb (24 to 25 kg)
Caliber5 in (127 mm)
BreechVertical sliding-wedge
Recoil15 in (38 cm)
Elevation−15° to +85°
Traverse328.5 degrees
Rate of fireDesign: 15 rpm
Muzzle velocity2,600 ft/s (790 m/s) initial
SightsOptical telescope

The Mark 12 5"/38 caliber gun was a United States naval gun. The gun was installed into Single Purpose[1] and dual purpose mounts used primarily by the US Navy. On these 5" mounts, single purpose (SP) means that the mount is limited to 35° elevation with no provision for AA shell fuze setters,[2] and is designed to fire at surface targets only. Dual purpose (DP) means that it is designed to be effective against both surface and aircraft targets because it can elevate to 85° and has on mount AA shell fuze setters. The 38 caliber barrel was a mid-length compromise between the previous United States standard 5"/51 low-angle gun and 5"/25 anti-aircraft gun. United States naval gun terminology indicates the gun fired a projectile 5 inches (127 mm) in diameter, and the barrel was 38 calibers long. The increased barrel length provided greatly improved performance in both anti-aircraft and anti-surface roles compared to the 5"/25 gun. However, except for the barrel length and the use of semi-fixed ammunition, the 5"/38 gun was derived from the 5"/25 gun. Both weapons had power ramming, which enabled rapid fire at high angles against aircraft. The 5"/38 entered service on USS Farragut, commissioned in 1934, the first new destroyer design since the last Clemson was built in 1922. The base ring mount, which improved the effective rate of fire, entered service on USS Porter, commissioned in 1936.[3][4]

Among naval historians, the 5"/38 gun is considered the best intermediate-caliber,[5] dual purpose naval gun of World War II,[6] especially as it was usually under the control of the advanced Mark 37 Gun Fire Control System which provided accurate and timely firing against surface and air targets. Even this advanced system required nearly 1000 rounds of ammunition expenditure per aircraft kill.[7] However, the planes were normally killed by shell fragments and not direct hits; barrage fire was used, with many guns firing in the air at the same time. This would result in large walls of shell fragments being put up to take out one or several planes or in anticipation of an unseen plane, this being justifiable as one plane was capable of significant destruction. The comparatively high rate of fire for a gun of its caliber earned it an enviable reputation, particularly as an anti-aircraft weapon, in which role it was commonly employed by United States Navy vessels. Base ring mounts with integral hoists had a nominal rate of fire of 15 rounds per minute per barrel; however, with a well-trained crew, 22 rounds per minute per barrel was possible for short periods.[6] On pedestal and other mounts lacking integral hoists, 12 to 15 rounds per minute was the rate of fire.[8] Useful life expectancy was 4600 effective full charges (EFC) per barrel.[9]

The 5"/38 cal gun was mounted on a very large number of US Navy ships in the World War II era. It was backfitted to many of the World War I-era battleships during their wartime refits, usually replacing 5"/25 guns that were fitted in the 1930s. It has left active US Navy service, but it is still on mothballed ships of the United States Navy reserve fleets. It is also used by a number of nations who bought or were given US Navy surplus ships. Millions of rounds of ammunition were produced for these guns, with over 720,000 rounds still remaining in Navy storage depots in the mid-1980s because of the large number of Reserve Fleet ships with 5"/38 cal guns on board.

Informations complémentaires

Poids1 kg
Dimensions20 cm







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