| QF 4.7 inch Gun Mk V | |
|---|---|
 On troopshipOrca, March 1919 | |
| Type | Naval gun Coast defence gun |
| Place of origin | United Kingdom Japan |
| Service history | |
| In service | 1900–1945 |
| Used by | British Empire |
| Wars | World War I World War II |
| Production history | |
| Designer | Elswick Ordnance |
| Designed | ca. 1895 |
| Variants | Mark V, Mark V* |
| Specifications | |
| Mass | Barrel & breech 5,936 pounds (2,693 kg)[1] |
| Barrel length | 212.6 inches (5.40 m) (45cal)[1] |
| Shell | Separate loading QF 45 pounds (20.41 kg)Common Pointed,Lyddite |
| Calibre | 4.724 inches (120 mm) |
| Breech | single motioninterrupted screw |
| Recoil | 8 inch[1] |
| Elevation | -10° to +20°[2] |
| Rate of fire | Approx. 8-10 rounds per minute[3] |
| Muzzle velocity | 2,350 feet per second (720 m/s)[4] |
| Maximum firing range | 16,500 yards (15,100 m)[1] |
TheQF 4.7 inch Gun Mark V originated as a 4.7 in (120 mm)45-calibre naval gun designed by theElswick Ordnance Company for export customers and known as the Pattern Y.[3]
TheRoyal Navy did not adopt the gun, but several were adopted by the army ascoast defence guns around the United Kingdom from 1900 onwards.[1] InWorld War I theUK acquired 620[3] of a version manufactured in Japan, and mounted them as anti-submarine guns on merchant ships andtroop ships, under the designation Mark V*. Many of these guns were used again inWorld War II ondefensively armed merchant ships and troop ships.
On 10 March 1917 the crew of a single gun on therefrigeratedcargo linerOtaki fought a notable action against the heavily armed German commerce raiderSMS Möwe. They managed to set theMöwe on fire and inflicted significant damage before theOtaki was sunk.Otaki'sMasterArchibald Bisset Smith went down with his ship and was posthumously awarded theVictoria Cross for refusing to surrender his ship.
Media related toQF 4.7 inch Mk V naval gun at Wikimedia Commons