BL 4.7-inch 45-calibre Naval Gun on:
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The BL 4.7-inch, 45-calibre gun (actually a metric 120 mm gun) was a British medium-velocity naval gun introduced in 1918 for destroyers, intended to counter a new generation of heavily armed destroyers that Germany was believed to be developing.
Mk I, of built-up
4.7 inch SAP Mk II A shell diagrams 1933.jpg,
British 4.7"/45 (12 cm) BL Mark I 4.7"/45 (12 cm) BL Mark II
Description and history
Mk I, of built-up wire-wound
This article explains terms used for the British Armed Forces' ordnance (i.e.: weapons) and also ammunition. The terms may have slightly different meanings in the military of other countries.
BD
Between decks: applies to a naval gun mounting in ...
construction with propellant charge in a cloth bag went into service beginning in 1918 on destroyers of the new Admiralty type destroyer leader
The Admiralty type leader, sometimes known as the ''Scott'' class, were a class (ship), class of eight Flotilla leader, destroyer leaders designed and built for the Royal Navy towards the end of World War I. They were named after scotland, Scot ...
(''Scott'' class) and Thornycroft type leader
The Thornycroft type leader or ''Shakespeare'' class were a class (ship), class of five Flotilla leader, destroyer leaders designed by John I. Thornycroft & Company and built by them at Woolston, Hampshire, Woolston, Southampton for the Royal Na ...
(''Shakespeare'' class). Some saw service in World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
, but most entered service after the war ended.
It was also mounted on :
* s as re-gunned in 1918
* Thornycroft and Admiralty Modified W-class destroyers completed 1919–1920
* Prototype destroyers and commissioned 1926 & 1927
Mk II was a monobloc-barrel (i.e. single-piece, typical of small-medium World War II guns) gun of similar performance introduced in World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
to replace the worn-out Mk I guns on surviving ships.
These were the only BL-type 4.7-inch guns in British service, all others have been of the QF-type. They were superseded on new destroyers from 1930 by the QF 4.7-inch Mk IX.
Ammunition
See also
* QF 4.7-inch Mk IX: British QF successor * List of naval gunsWeapons of comparable role, performance and era
* Type 3 120 mm 45 caliber naval gun : Japanese equivalent *5"/51 caliber gun
5"/51 caliber guns (spoken "five-inch-fifty-one-caliber") initially served as the secondary battery of United States Navy battleships built from 1907 through the 1920s, also serving on other vessels. United States naval gun terminology indicates t ...
: US Navy equivalent
Notes
References
Bibliography
* Tony DiGiulianBritish 4.7"/45 (12 cm) BL Mark I 4.7"/45 (12 cm) BL Mark II
External links
{{DEFAULTSORT:BL 04.7-inch gun Naval guns of the United Kingdom World War I naval weapons of the United Kingdom World War II naval weapons of the United Kingdom 120 mm artillery