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The USN 8"/15 (20.3 cm) Mark 8 was the Vickers 8" (20.3 cm) BL Mark 6 Model 1917 land howitzer that was issued to the US Marine Corps during World War I. Weight with breech block was 6,552 lbs. (2,972 kg). The data that follows is for the Mark 7 unless otherwise noted. |
8"/23 (20.3 cm) Mark 7 Howitzer |
Vickers 8"/15 (20.3 cm) Mark 8 Howitzer |
| Designation | 8"/23 (20.3 cm) Mark 7 |
| Ship Class Used On | Flush-deck destroyers of World War I |
| Date Of Design | N/A |
| Date In Service | 1918 (?) |
| Gun Weight | 5,560 lbs. (2,522 kg) with breech block |
| Gun Length oa | 190 in (4.826 m) |
| Bore Length | 184 in (4.674 m) |
| Rifling Length | N/A |
| Grooves | N/A |
| Lands | N/A |
| Twist | Uniform RH 1 in 15 |
| Chamber Volume | N/A |
| Rate Of Fire | 3 - 4 rounds per minute |
| Type | Bag |
| Projectile Types and Weights | HE - 285 lbs. (129.3 kg) |
| Bursting Charge | HE - 70 lbs. (31.8 kg) |
| Projectile Length | N/A |
| Propellant Charge | N/A |
| Muzzle Velocity | 650 fps (198 mps) |
| Working Pressure | N/A |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | N/A |
| Note: This weapon may have later used the standard 8" (20.3 cm) 260 lbs. (118 kg) shell. | |
| Elevation | With 285 lbs. (129.3 kg) HE Shell |
| Range @ 20.8 degrees | 2,600 yards (2,380 m) |
| Designation | N/A |
| Weight | N/A |
| Elevation | N/A |
| Elevation Rate | Manual operation, only |
| Train | about +150 / -150 degrees |
| Train Rate | Manual operation, only |
| Gun recoil | N/A |
| Loading angle | N/A |
| Note: This mounting was interchangeable with the standard 4"/50 (10.2 cm) Mark 12 mounting used on the flush-deck destroyers of World War I. | |