BL 5.5-inch Mk I naval gun explained

BL 5.5-inch Mark I
Origin:United Kingdom
Type:Naval gun, Coastal defence
Is Ranged:yes
Is Artillery:yes
Is Uk:yes
Service:1913–1954
Wars:World War I
World War II
Designer:Coventry Ordnance Works
Design Date:1913
Manufacturer:Coventry Ordnance Works
Number:81
Weight:13,955 lbs (6,330 kg)[1]
Length:275inches L/50
Cartridge:82lb
Caliber:5.5inches
Rate:12 rounds per minute
Velocity:2,790 f/s (850 m/s)[2]
Range:17800yd at 30-degree elevation
Breech:Welin breech block with Holmstrom mechanism[3]
Elevation:-7 degrees to +30 degrees depending on mount[4]

The Breech Loading 5.5-inch Mk I was a naval gun used by the British Royal Navy during both World Wars.

Naval history

This weapon was developed by Coventry Ordnance Works in 1913 and offered to the Greek Navy as the main armament for two new cruisers building at Cammell Laird. On the outbreak Of World War I the two ships were purchased by Britain as HMS Chester and HMS Birkenhead. The RN was happy with the performance of the gun as it was significantly lighter than the standard 6 inch gun and fired an 82 lb shell rather than the 100 lb shell of the 6 inch weapon. It, therefore, had a higher rate of fire with little loss in hitting power. The British ordered more guns as secondary armament for HMS Furious and HMS Hood. A total of 81 guns were made and were used on the following ships:HMS Chester,HMS Birkenhead,,, andHMS Hermes.

Guns removed from Chester, Birkenhead and Furious were used to arm Armed Merchant cruisers:HMS Laurentic and HMS Montclare.

Coast defence gun

The 5.5 inch guns were removed from in the 1935 refit. In 1940 two were installed in Fort Bedford Battery on Ascension Island and remain there today. A pair were installed in specially built casemates on the roof of Coalhouse Fort in Essex, overlooking the Thames.[5] Guns from the Hood also went to Bognor Regis, Pevensey, North Foreland, Dover and Folkestone.[6]

Notable actions

Boy Seaman First Class Jack Cornwell was posthumously awarded the Victoria Cross for heroism in serving his gun on HMS Chester during the Battle of Jutland on 31 May 1916.

Surviving examples

See also

Weapons of comparable role, performance and era

References

Bibliography

Notes and References

  1. Campbell, Naval Weapons of WWII, p.40.
  2. Campbell, Naval Weapons of WWII, p.40.
  3. Di Giulian
  4. Campbell, Naval Weapons of WWII, p.40.
  5. Web site: PastScape: Coalhouse Fort . English Heritage . English Heritage . 2008 . National Monuments Record: PastScape . English Heritage . 10 February 2012 . dead . https://web.archive.org/web/20131102061359/http://www.pastscape.org.uk/hob.aspx?hob_id=413479&sort=2&type=&typeselect=c&rational=a&class1=None&period=None&county=None&district=None&parish=None&place=&recordsperpage=10&source=text&rtype=monument&rnumber=413479 . 2 November 2013 .
  6. Web site: HMS Hood Technical Specifications & Armament Information: Secondary/Dual Purpose Guns . HMS Hood Association . 4 April 2010 . 10 February 2012.