RML 11-inch 25-ton gun
RML 11-inch 25-ton guns were large rifled muzzle-loading guns used as primary armament on British battleships and for coastal defence. They were effectively the same gun as the RML 12-inch 25-ton gun, bored to 11 inches instead of 12.
|Ordnance RML 11-inch 25-ton gun|
Coast defence gun
|Used by||Royal Navy|
|Wars||Bombardment of Alexandria|
|Variants||Mk I, Mk II|
|Mass||25 long tons (25,000 kg)|
|Barrel length||145 inches (3.7 m) (bore + chamber)|
|Shell||532 to 543 pounds (241.3 to 246.3 kg) Palliser, Common, Shrapnel|
|Calibre||11-inch (279.4 mm)|
|Muzzle velocity||1,360 feet per second (410 m/s)|
Mark I was introduced in 1867. Mark II was introduced in 1871 using the simpler and cheaper "Fraser" gun construction method which had proved successful with the RML 9-inch 12-ton Mk IV gun.
Guns were mounted on :
When the gun was first introduced projectiles had several rows of "studs" which engaged with the gun's rifling to impart spin. Sometime after 1878, "attached gas-checks" were fitted to the bases of the studded shells, reducing wear on the guns and improving their range and accuracy. Subsequently, "automatic gas-checks" were developed which could rotate shells, allowing the deployment of a new range of studless ammunition. Thus, any particular gun potentially operated with a mix of studded and studless ammunition.
The gun's primary projectile was 536 – 543 pound "Palliser" armour-piercing shot, which were fired with a "Battering charge" of 85 pounds of "P" (gunpowder) or 70 pounds of "R.L.G." (gunpowder) for maximum velocity and hence penetrating power. Shrapnel and Common (exploding) shells weighed 532 – 536 pounds and were fired with a "Full charge" of 60 pounds "P" or 50 pounds "R.L.G.".
- Treatise on Construction of Service Ordnance 1877, page 292
- MV of 1,360 feet/second firing 543-pound 2-oz projectile with "Battering charge" of 85 pounds "P" (gunpowder) is quoted in "Text Book of Gunnery 1887" Table XVI.
- Treatise on Construction of Service Ordnance, 1879, page 281-282
- Treatise on Ammunition 1877, pages 191,194, 205, 220
- Treatise on Ammunition. War Office, UK, 1877
- Treatise on the Construction and Manufacture of Ordnance in the British service. War Office, UK, 1877
- Treatise on the Construction and Manufacture of Ordnance in the British Service. War Office, UK, 1879
- Text Book of Gunnery, 1887. LONDON : PRINTED FOR HIS MAJESTY'S STATIONERY OFFICE, BY HARRISON AND SONS, ST. MARTIN'S LANE
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