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QF 6 pounder Hotchkiss

QF 6 pounder Hotchkiss
Elswick6PounderGuncirca1897.jpg
Early Elswick gun on recoil mounting
Type
Place of origin France
Service history
In service 1885–1940s
Used by
Wars
Production history
Designer Hotchkiss et Cie
Designed 1883
Number built 3,984 (UK)
Specifications
Weight 821–849 lb (372–385 kg) barrel & breech
Barrel length various. 40–58 calibres

Shell
  • Fixed QF 57x307R Common and Steel Shell 6 lb (2.7 kg)
  • 9.7 lb (4.4 kg) complete round
Calibre 57-millimetre (2.244 in)
Breech Vertical sliding block
Recoil Hydro-spring, 4 inch
Rate of fire 25 / minute
Muzzle velocity 1,818 feet per second (554 m/s)
Effective firing range 4,000 yards (3,700 m)

The QF 6 pounder Hotchkiss was a light 2.24 inch (57 mm) naval gun and coast defence gun of the late 19th century used by many countries, and was adapted for use in the early British tanks in World War I.

The UK adopted a 40-calibre (i.e. 90 inch barrel) version as Ordnance QF Hotchkiss 6 pounder gun Mk I and Mk II or QF 6 pounder 8 cwt. It was manufactured under licence by the Elswick Ordnance Company.

They were originally mounted for use against the new (steam-driven) torpedo boats which started to enter service in the late 1870s.

The original 1885 Mk I lacked a recoil system. The Mk II of 1890 introduced a recoil system, with a pair of recoil/recuperator cylinders.

During World War I the navy required many more guns and a version with a single-tube barrel was developed to simplify manufacture, identified as "6 pdr Single Tube". Initially these guns were only allowed to be fired with a special lower charge but in 1917 they were relined with A tubes as Mk I+++ which enabled them to use the standard 6 pounder ammunition.

After World War I the gun was considered obsolete for combat use, but continued in use as a saluting gun and as a sub-calibre training gun. Many were brought back into active service in World War II for arming small vessels for coastal and anti-submarine warfare, and for coastal defence. The vessels so armed included early models of the famous Fairmile D Motor Gunboats, some of which were not re-armed with the modern autoloading 6 pdr MkIIA until late 1944.

The gun was used to equip Male versions of the early British tanks, Mk I - Mk III. In 1916 the British Army having no prior experience in fighting tanks was faced with the difficulty of quickly providing a new class of weapon. The existing Hotchkiss 6 pounder naval gun appeared to most closely meet the need (a compact enough weapon to fit into a tank sponson with a sufficient delivery of high explosive). A single gun was mounted in each sponson, i.e. 2 per Male tank (tanks armed only with machine guns were designated Female), able to fire forwards or to the side.


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