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Elswick 6 inch naval gun

QF 6 inch 40 calibre naval gun
15 cm/40 (6") 41st Year Type
QF6inchElswickNavalGun.jpg
Typical naval deck mounting. An early long cartridge case for gunpowder propellant is upended at bottom left, a shell stands next to the cartridge.
Type Naval gun
Coast defence gun
Place of origin United Kingdom
licence-produced in Japan
Service history
In service 1892–1945
Used by Royal Navy
Imperial Japanese Navy
Chilean Navy
Italian Navy
Argentine Navy
United States
Romanian Navy
Wars Russo-Japanese War
World War I
World War II
Production history
Manufacturer Elswick Ordnance Company
Royal Arsenal, Woolwich
Specifications
Weight 6.6 tons
Barrel length 240 inches (6.096 m) bore

Shell 100 pounds (45 kg) QF, separate cartridge and shell
Elevation -5 / +20 degrees
Traverse +150 / -150 degrees
Rate of fire 5-7 rounds per minute
Muzzle velocity 2,154 feet per second (657 m/s)
820 feet per second (250 m/s) for anti-submarine shells
Effective firing range 10,000 yards (9,140 m) at 20°elevation; 15,000 yards (13,700 m) at 28°elevation

The QF 6 inch 40 calibre naval gun (Quick-Firing) was used by many United Kingdom-built warships around the end of the 19th century and start of the 20th century.

In UK service it was known as the QF 6 inch Mk I, II, III guns. As the 15 cm/40 (6") 41st Year Type naval gun it was used for pre-dreadnought battleships, armoured cruisers and protected cruisers of the early Imperial Japanese Navy built in UK and European shipyards. It was also the heaviest gun ever carried by a pre-Cold War destroyer.

These guns were developed to exploit the new "QF" technology, which involved loading the propellant charge in a brass case with primer in its base. The brass case also sealed the breech, allowing a lighter mechanism. This was presumed to allow a faster rate of fire than the older "Breech Loading" system, where the propellant was loaded in cloth bags and then a separate friction or percussion tube fitted into the breech for firing. The QF principle had proved successful with the much smaller QF 3 pounder Hotchkiss and Nordenfelt QF 3 and 6 pounders from 1885 onwards.

The Mk I was an Elswick gun of built up construction. Mk II was built by Woolwich Arsenal and in 1891 became the first Royal Navy gun using the Armstrong wire-wound construction. The breech mechanisms were developed from the existing 6-inch (150 mm) BL mechanisms, but as it no longer had to provide obturation (sealing of the breech), the front was made coned rather than straight which allowed it to be swung round to the side before it was fully withdrawn, rather than having to be fully withdrawn before swinging to the side as with the BL gun.

The preceding generation of British 6-inch guns (BL Mks III, IV and VI) had old-style trunnions by which they were mounted on Vavasseur inclined slides to absorb recoil. QF Mk I and II dispensed with trunnions and instead on the lower side of the breech ring were lugs to which were attached modern recoil buffer and hydrospring recuperator (runout) cylinders to absorb recoil and return the barrel to loading position after firing. This allowed the gun to recoil directly backwards rather that backwards and upwards as previously, and is the recoil system which in essence is still in use.


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