BL 4-inch Mk IX naval gun
|Ordnance BL 4-inch Mk IX gun|
|Used by|| Royal Navy|
Royal Canadian Navy
Free French Navy
|Wars||World War I|
World War II
|Mass||2 tons barrel & breech|
|Barrel length||180 inches (4.572 m) bore (45 calibres)|
|Shell||31 pounds (14.1 kg)|
|Calibre||4 inches (101.6 mm)|
|Breech||Welin interrupted screw|
|Elevation||-10 degrees to +30 degrees|
|Rate of fire||10-12 rpm|
|Muzzle velocity||800 metres per second (2,600 ft/s)|
|Maximum firing range||12,660 metres (13,850 yd)|
The BL 4-inch Mk IX naval gun[note 1] was a British medium-velocity naval gun introduced in 1917 as secondary armament on the Renown-class battlecruisers and Glorious-class "large light cruisers", but which served most notably as the main armament on Flower-class corvettes throughout World War II.
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World War I
The gun was based on the barrel of the QF 4-inch Mk V and the breech mechanism of the BL 4-inch Mk VIII and was first introduced in World War I on capital ships as secondary armament in triple-gun mountings, intended to provide rapid concentrated fire. This turned out to be unworkable in practice. Jane's Fighting Ships of 1919 commented, "4-inch triples are clumsy and not liked. They are not mounted in one sleeve; have separate breech mechanism, a gun crew of 23 to each triple". Guns were thereafter used in single-gun mountings, typically on smaller ships as the main armament.
World War II
In World War II the gun was employed on many small warships such as Flower-class corvettes and minesweepers, primarily for action against surfaced submarines.
This was the last BL 4 inch gun in British service: all subsequent guns have used charges in metal cartridges "QF". It was succeeded on new small warships built in World War II by the QF 4-inch Mk XIX gun which fired a slightly heavier shell at much lower velocity and had a high-angle mounting which added anti-aircraft capability.
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- On board HMCS Sackville, the last surviving Flower-class corvette, at Halifax, Nova Scotia, Canada
- A gun at the entrance to the marina in Hull, UK
- A gun at Port Isaac, Cornwall, UK
- Leith Harbour In South Georgia
Discover more about Surviving examples related topics
Source: "BL 4-inch Mk IX naval gun", Wikipedia, Wikimedia Foundation, (2022, August 14th), https://en.wikipedia.org/wiki/BL_4-inch_Mk_IX_naval_gun.
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- ^ Mk IX = Mark 9. Britain used Roman numerals to denote Marks (models) of ordnance until after World War II. Mark IX indicates this was the ninth model of BL 4-inch gun.
- ^ Campbell, Naval Weapons of WWII, pp.42-43.
- ^ a b Campbell, Naval Weapons of WWII, p.38.
- ^ DiGiulian
- ^ "Jane's Fighting Ships 1919, page 62". Archived from the original on 6 October 2008. Retrieved 18 December 2008.
- Tony DiGiulian, British 4"/45 (10.2 cm) BL Marks IX and X
- Campbell, John (1985). Naval Weapons of World War Two. Naval Institute Press. ISBN 0-87021-459-4.
- 100 mm artillery
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- Naval guns of the United Kingdom
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- Use British English from January 2017
- Use dmy dates from January 2017
- World War II naval weapons of the United Kingdom
- World War I naval weapons of the United Kingdom
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