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Ordnance BL 7.5 inch gun Mk VI
HMS Effingham.jpg
Hawkins class cruisers were the only ships mounting BL 7.5 inch Mk VI guns.
Type Naval gun
Coast defence gun
Place of origin United Kingdom United Kingdom
Service history
In service 1919–1945[1]
Used by Royal Navy
Wars World War II
Production history
Number built 44[2]
Specifications
Weight 14 tonnes[2]
Barrel length 337.5 inches (8.6 m); (45 calibres)[2]

Shell 200 pounds (91 kg)[2]
Calibre 7.5-inch (190 mm)[2]
Muzzle velocity 2,770 feet per second (844 m/s)[2]
Maximum range 19 kilometres (12 mi)[2]

The BL 7.5 inch gun Mark VI[3] was the 45 calibre naval gun forming the main battery of Royal Navy Hawkins-class cruisers. These ships with seven single gun mounts were significant to the cruiser limitations defined by the Washington Naval Treaty.[4]

Description[edit | edit source]

These were built-up guns with two tubes, full-length wire winding, a jacket, and Welin breech block with hand operated Asbury mechanism. They used two cloth bags each containing 14 kg (31 pounds) of cordite to fire a 200-pound (91-kg) projectile up to 19 kilometers at their maximum elevation of 30 degrees. Useful life expectancy was 650 effective full charges (EFC) per barrel.[2]

Coast defence guns[edit | edit source]

Seven guns were installed as coastal artillery in the Netherlands Antilles, five in Mozambique, three in Canada, and three in a battery at South Shields during the Second World War.[2]

Shell trajectory[edit | edit source]

Range[2] Elevation Time of flight Descent Impact velocity
5000 yd (4.6 km) 2° 30′ 7 sec 3° 19′ 1799 ft/s (548 m/s)
10000 yd (9.1 km) 7° 3′ 17 sec 12° 32′ 1218 ft/s (371 m/s)
15000 yd (14 km) 15° 21′ 32 sec 27° 33′ 1038 ft/s (316 m/s)
20000 yd (18 km) 27° 59′ 51 sec 44° 35′ 1071 ft/s (326 m/s)

See also[edit | edit source]

Notes and references[edit | edit source]

  1. Whitley 1995 pp.77–80
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Campbell 1985 p.33
  3. Mark VI = Mark 6. Britain used Roman numerals to denote Mark (models) of ordnance until after World War II. This was the 6th model of BL 7.5-inch naval gun.
  4. Preston 1980 pp.69–70

Bibliography[edit | edit source]

  • Campbell, John (1985). Naval Weapons of World War Two. Naval Institute Press. ISBN 0-87021-459-4. 
  • Lenton, H.T. & Colledge, J.J (1968). British and Dominion Warships of World War Two. Doubleday and Company. 
  • Preston, Anthony (1980). Cruisers. Prentice-Hall. ISBN 013-194902-0. 
  • Whitley, M.J. (1995). Cruisers of World War Two. Brockhampton Press. ISBN 1-86019-8740. 

External links[edit | edit source]


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