BL 16.25-inch Mk I naval gun

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Ordnance BL 16.25 inch gun Mk I
BL 16.25 inch 110 ton gun Photo.jpg
Type Naval gun
Place of originUnited Kingdom
Service history
In service1888 – 1909?
Used by Royal Navy
Production history
Manufacturer Elswick Ordnance Company
No. built12
Variantsno two guns were identical
Specifications
Mass111 tons
Length43 ft 7 in; 13.3 m
Barrel  length40 ft 8 in; 12.4 m bore (30 calibres)

Shell 1,800 lb (820 kg) Armour-piercing, Common, or Shrapnel
Calibre 16.25 in (413 mm)
Elevation -5° – 13°
Rate of fire about one round every three minutes
Muzzle velocity 2,087 feet per second (636 m/s) [1]
Maximum firing range12,000 yards (11,000 m) [2]

The Elswick BL 16.25 inch naval gun was an early British superheavy rifled breech-loading naval gun, commonly known as the 110-ton gun or 111-ton gun.

Contents

Service

Forward barbette on HMS Benbow HMS Benbow Forward 16.25 inch gun barbette.jpg
Forward barbette on HMS Benbow
Turret on HMS Sans Pareil HMS Sans Pareil 16.25 inch turret.jpg
Turret on HMS Sans Pareil
111-ton gun on proof mount The railroad and engineering journal (1887) (14571889167).jpg
111-ton gun on proof mount

Elswick had already supplied similar guns to Italy's Regia Marina and fitted in the Italian ironclad Andrea Doria of 1885 and the Royal Navy required parity for its Mediterranean Fleet. The adoption of this gun was influenced by the slow rate of production of the preferred new 13.5-inch (343 mm) guns: the Royal Navy had the option of delaying the completion of the new Admiral-class ironclads until sufficient 13.5-inch guns were available to equip them with four guns in two twin barbettes as planned; to use 12-inch (305 mm) guns, or to equip them with the new 16.25-inch (413 mm) guns.

The decision made was to install 16.25-inch guns in HMS Benbow in 1887 in single barbettes fore and aft, each gun substituting for two 13.5-inch guns. For the following HMS Victoria and HMS Sans Pareil the 16.25-inch guns were mounted in pairs in a single turret placed forward.

Weaknesses such as droop and cracking were discovered in the early design, and the many subsequent changes meant that none of the twelve guns built were identical, so the Mk I denomination was discontinued and the individual guns were referred to by their serial numbers. The great weight, low rate of fire and short life of less than 75 rounds meant that the guns were less than successful and were in fact never fired in action.

Ammunition

Diagrams of common, shrapnel and armour-piercing projectiles and their fuzes for the gun BL 16.25 inch gun ammunition diagrams.jpg
Diagrams of common, shrapnel and armour-piercing projectiles and their fuzes for the gun

See also

Notes

  1. 1800lb shell, with 960lb S.B.C. ("slow burning Brown cocoa" powder – a form of gunpowder) charge. Text Book of Gunnery, 1902. Table XII, Page 336
  2. Text Book of Gunnery, 1902. Table XII, Page 336

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References