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The horizontal sliding-block breech opened semi-automatically after the guns fired. [1] The guns could be loaded at any angle of elevation. The Mk XX mounting could elevate to a maximum of 50° and depress to −10°. The turret had a maximum powered training rate of 10° per second, but was manually elevated.
These guns succeeded the similar World War I-era BL 4.7 inch gun, changing the cartridges from BL silk bags to separate QF in brass cases and a new horizontal sliding-block breech mechanism. Mark IX was deployed in single mountings CP Mk XIV on the A-class destroyers of 1930 and on most subsequent destroyer classes up to and including the R ...
The K10 differing from the earlier guns by having a 5 cm (2 in) longer firing chamber to accommodate a larger propellant charge. Otherwise weights, dimensions and ballistic performance for the two series of guns were very similar. Both guns used Krupp horizontal sliding breech blocks with separate loading metallic cased charges and projectiles. [5]
Later all ships received five L/30 K09 BAG guns on dual-purpose mounts after 1912–1913 refits. One of these ships Ulan was ceded to Greece after World War I and was renamed Smyrni. Tátra-class - The six ships of this class had a secondary armament of six SFK L/45 guns on low angle mounts. Two of these guns were replaced with dual-purpose G ...
It succeeded the higher-velocity World War I-era BL 4-inch Mk IX (typically deployed on Flower-class corvettes in the escort role). The Mk XIX fired fixed ammunition which was 38.5 inches (0.98 m) long and weighed 50 pounds (23 kg). [3]
The QF 4-inch gun Mk IV [note 1] was the main gun on most Royal Navy and British Empire destroyers in World War I.It was introduced in 1911 as a faster-loading light gun successor to the BL 4 inch Mk VIII gun.
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