Possibly manufactured by Krupp and used on a Coastal Defense Ship. Overall length was 42.16 calibers and it appears that the actual bore length was 39.58 calibers.
| Designation | 28.3 cm/42.5 (11.1") |
|---|---|
| Ship Class Used On | Zeven Provinciën (later renamed Soerabaia) |
| Date Of Design | N/A |
| Date In Service | 1910 |
| Gun Weight | 33.5 tons (34 mt) |
| Gun Length oa | 470 in (11.930 m) |
| Bore Length | 441 in (11.201 m) |
| Rifling Length | 355.8 in (9.0365 m) |
| Grooves | (80) 0.11 x 0.27 in (2.8 D x 6.8 W mm) |
| Lannds | 0.17 in (4.2 mm) |
| Twist | Increasing RH 1 in 50 to 1 in 30 |
| Chamber Volume | N/A |
| Rate Of Fire | about 2 rounds per minute |
| Type | Bag |
|---|---|
| Projectile Types and Weights | AP L/2,8 - 595 lbs. (270 kg)
HE L/3,0 - 595 lbs. (270 kg) |
| Bursting Charge | AP L/2,8 - about 5.95 lbs.(2.7 kg) TNT
HE L/3,0 - about 29.76 lbs. (13.5 kg) TNT |
| Projectile Length | N/A |
| Propellant Charge | 220 lbs. (100 kg) |
| Muzzle Velocity | 2,920 fps (890 mps) |
| Working Pressure | N/A |
| Approximate Barrel Life | N/A |
| Ammunition stowage per gun | N/A |
| Elevation | Distance |
|---|---|
| 15 degrees | 17,600 yards (16,100 m) |
| Designation | Single Turrets: Zeven Provinciën (2) |
|---|---|
| Weight | 194.3 tons (197.4 mt) |
| Elevation | -4 / +15 degrees |
| Elevation Rate | N/A |
| Train | about +120 / -120 degrees |
| Train Rate | N/A |
| Gun recoil | N/A |
| Loading Angle | N/A |
"Dutch Naval Weapons of the early 20th Century" by Stefan Boon (unpublished manuscript)
"Naval Weapons of World War Two" by John Campbell
"Battleships of World War I" by Peter Hore
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Collection of Netherlands Institute for Military History (NIMH) Photographs (Dutch Language)
07 July 2007 - Benchmark
21 March 2023 - Converted to HTML 5, added details to gun, ammunition and turrets