BL 7.5 inch Mk II – V naval gun

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Ordnance BL 7.5 inch gun Mk II - Mk V
300px
Turrets for HMS Shannon under construction at the Vickers Works, Barrow
Type Naval gun
Coast defence gun
Place of origin United Kingdom United Kingdom
Service history
In service 1905 - 1920
Used by Royal Navy
British India
Wars World War I
Production history
Variants Mks II, II*, II**, III, IV, V
Specifications
Weight 14½ - 16 tons barrel & breech
Barrel length 375 inches (9,525 mm); (50 calibres)

Shell 200 pounds (90.72 kg)
Calibre 7.5-inch (190.5 mm)
Muzzle velocity 2,765 to 2,840 feet per second (843 to 866 m/s)[1]
Maximum range 14,200 yards (13,000 m)[2]

The BL 7.5 inch guns Mk II - Mk V were a variety of 50 calibres naval guns used by Britain in World War I. They all had similar performance and fired the same shells.

History

Mark II

Mark II guns were originally developed to suit India's coast defence requirements. During World War I several reserve guns made for India but still in the UK were employed as coast defence guns in the UK. They were scrapped or sent to India soon after the war.[3]

Marks II*, II**, V

These were built and employed specifically as naval guns and were mounted as secondary armament as a heavier alternative to 6-inch guns, on the following ships :


Mark III

File:HMS Swiftsure forward guns Gallipoli 1915 AWM G01393 300px.jpeg
Forward port Mk III casemate guns on Swiftsure, Gallipoli 1915
File:BL7.5inchMkIIINavalGunFlanders1917.jpg
Mk III gun from Swiftsure being transported in Belgium in 1917. Photo by Ernest Brooks.

Mark III guns were built by Elswick Ordnance to arm the battleship Constitución they were building for Chile. Britain acquired them by default when she bought Constitución in 1903 to avoid the risk of them being acquired by Russia. Constitución became HMS Swiftsure in British service.

Swiftsure was decommissioned in 1917 and her guns were used for coast defence in Britain, as siege guns on the Belgian coast near Nieuport for attacking German batteries, and on M15 class monitors.

Mark IV

Mark IV guns were made by Vickers for the battleship Libertad they were building for Chile. Britain acquired them by default in 1903 when she bought Libertad together with Constitución. Libertad became HMS Triumph in British service.

Surviving examples

See also

Notes

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References

External links


Template:GreatWarBritishNavalWeapons

Template:GreatWarBritishWeaponsde:BL 7.5 inch Mk II – V naval gun
  1. Mk II (coast defence) : 2840 ft/second with 62 lb 12 oz cordite MD size 26 (Special for India)(Hogg & Thurston 1972 page 151); Mk II* & V : 2800 ft/second with 61 lb cordite MD size 26 ; Mk III & IV : 2765 ft/second with 54 lb 4 oz cordite MD size 26 (Range Tables for His Majesty's Fleet, 1910 February, 1911) & Treatise on Ammunition 1915.
  2. Mk II coast defence gun. Hogg & Thurston 1972, page 151
  3. Hogg & Thurston 1972, page 150