RBL 7-inch Armstrong gun
| Ordnance RBL 7-inch gun | |
|---|---|
A gun on a wooden slide carriage in the 19th century. | |
| Type |
|
| Place of origin | United Kingdom |
| Service history | |
| In service | 1861–190? |
| Used by | United Kingdom |
| Wars | |
| Production history | |
| Designer | W. G. Armstrong Co. |
| Manufacturer | |
| Unit cost | £425–£650 (equivalent to £47000–£72000 in 2013) |
| Produced | 1859–1864 |
| No. built | 959 |
| Variants | 82cwt, 72cwt |
| Specifications | |
| Barrel length | 99.5 inches (2.527 m) bore (14.21 calibres) |
| Shell | 90 to 109 pounds (40 to 50 kg) |
| Calibre | 7-inch (177.8 mm) |
| Breech | Armstrong screw with vertical sliding vent-piece (block) |
| Muzzle velocity | 1,100 feet per second (340 m/s) |
| Maximum firing range | 3,500 yards (3,200 m) |
The Armstrong RBL 7-inch gun, also known as the 110-pounder, was a heavy caliber Armstrong gun, an early type of rifled breechloader.
William Armstrong's innovative combination of a rifled built-up gun with breechloading had proven suitable for small cannon. When it was applied to a 7-inch gun, it proved that the pressure caused by the explosive charge that was required to propel a 110-pound shot was too much for his breechloading system.