BL 4 inch naval gun Mk I - VI
Encyclopedia
The BL 4-inch gun Mk I - Mk VI were a family of early British breech-loading 4-inch naval guns.
Both early Mk I types were quickly withdrawn from service following the explosion of a similar BL 6 inch Mk II gun on board HMS Cordelia in June 1891. Mk I 22.5 cwt continued to be used for training.
Mk II guns and later Marks armed the following warships : as re-gunned in 1885 as re-gunned in 1885
The gun was succeeded in its class from 1895 by the QF 4 inch gun Mk I
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. They were designated Mk I/IV, I/VI etc. depending on which Mark of BL 4-inch had been converted. All had a bore of 27.85 calibres after conversion, with a muzzle velocity of 2,177 ft/second.
13 cwt Mk I, 15 calibres
This was the first 4-inch BL gun. With its short (60-inch total) barrel it had a range of only 5,500 yards.22.5 cwt Mk I, 25 calibres
With its longer barrel (100 inch bore) Mk I had a range of 7,200 yards.Both early Mk I types were quickly withdrawn from service following the explosion of a similar BL 6 inch Mk II gun on board HMS Cordelia in June 1891. Mk I 22.5 cwt continued to be used for training.
26 cwt Mks II - VI, 27 calibres
The improved 27-calibres Mk II gun and subsequent Marks, often referred to as 4 inch 26 cwt, replaced the early Mk I versions in service. The longer barrel (108 inch bore : 27 calibres) gave it a range of 7,700 yards.Mk II guns and later Marks armed the following warships : as re-gunned in 1885 as re-gunned in 1885
- Pygmy class composite screw gunboats of 1888s launched in 1889 as re-gunned in 1891s of 1894
The gun was succeeded in its class from 1895 by the QF 4 inch gun Mk I
QF 4 inch naval gun Mk I - III
The QF 4-inch gun Mks I, II, III were early British QF naval guns originating in 1895. They all had barrels of 40 calibres length.-Naval service:The gun was intended to be a more powerful alternative to the 3-inch QF 12 pounder gun....
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QFC 4 inch gun
A small number of these guns were converted to QF to use the same cartridges as the QF 4 in gunQF 4 inch naval gun Mk I - III
The QF 4-inch gun Mks I, II, III were early British QF naval guns originating in 1895. They all had barrels of 40 calibres length.-Naval service:The gun was intended to be a more powerful alternative to the 3-inch QF 12 pounder gun....
. They were designated Mk I/IV, I/VI etc. depending on which Mark of BL 4-inch had been converted. All had a bore of 27.85 calibres after conversion, with a muzzle velocity of 2,177 ft/second.