A Vickers design. Suffered from "steel choke" and many guns used cannelured rings as a corrective measure.
Constructed of 'A' tube, inner 'A' tube, wire winding nearly full length, 'B' tube and jacket. There was a shrunk-on collar at the rear end of the 'A' tube and this and a screwed ring at the rear, secured the 'B' tube and jacket longitudinally. Used a Welin breech mechanism. Mark I* had a breech ring to which the breech mechanism was attached, the assembly shrunk over the rear end of the 'A' tube and then screwed to the jacket. Mark I** had a thicker 'A' tube end and a larger diameter breech ring. These differences apparently replaced the breech ring. A total of 33 guns were made, including three prototypes. Of these, 13 are known to have been Mark I* and four were either Mark I* or Mark II**.
Designation | 7.5"/45 (19 cm) Mark I |
---|---|
Ship Class Used On | Devonshire class and M.26 |
Date Of Design | about 1903 |
Date In Service | 1905 |
Gun Weight | 13.76 tons (14.0 mt) |
Gun Length oa | 349.2 in (8.870 m) |
Bore Length | about 375.0 in (9.525 m) |
Rifling Length | N/A |
Grooves | N/A |
Lands | N/A |
Twist | N/A |
Chamber Volume | N/A |
Rate Of Fire | 4 -5 rounds per minute |
Type | Bag |
---|---|
Projectile Types and Weights | AP: 200 lbs. (90.7 kg) Common: 200 lbs. (90.7 kg) CPC: 200 lbs. (90.7 kg) HE: 200 lbs. (90.7 kg) |
Bursting Charge | N/A |
Projectile Length | N/A |
Propellant Charge | N/A |
Muzzle Velocity | 2,765 fps (843 mps) |
Working Pressure | N/A |
Approximate Barrel Life | N/A |
Ammunition stowage per gun | N/A |
Projectiles were 2crh.
Elevation | Distance |
---|---|
15 degrees | 14,008 yards (12,810 m) |
Taken from range tables, but "Warship Volume VII" says that these were probably about 200 yards (180 m) too long.
Range | Vertical KC Plate |
---|---|
3,000 yards (2,740 m) | 4.5 in (11.4 cm) |
Data from "The Grand Fleet: Warship Design and Development 1906-1922" for an angle of obliquity of 30 degrees and a striking velocity of 1,640 fps (500 mps). Projectiles were salt-filled (blind).
Designation |
|
---|---|
Weight | N/A |
Elevation | about -5 / +15 degrees |
Elevation Rate | Manual operation, only |
Train | Bow and Stern mounts: about +150 / -150 degrees Wing mounts: about +30 / +150 degrees |
Train Rate | N/A |
Gun recoil | N/A |
Loading Angle | N/A |
- The Vickers Photographic Archive
- See photographs 6470 and 6796
Data from:
- "Warrior to Dreadnought: Warship Development 1860-1905" and "The Grand Fleet: Warship Design and Development 1906-1922" both by D.K. Brown
- "British Naval Guns 1880-1945 No 9" article by John Campbell in "Warship Volume VII"
- "World Warships in Review 1860-1906" by John Leather
Special help by Daniel Muir
- 07 January 2007
- Benchmark
- 11 February 2012
- Updated to latest template
- 01 December 2015
- Changed Vickers Photographic Archive links to point at Wayback Archive