A Krupp gun used on Coastal Defense Ships. Bore length was 37.15 calibers. At least two guns were used by the Germans in coastal defense batteries located in the Netherlands.
Although this and other guns of its caliber in service with the Austria-Hungary and German fleets were all built by Krupp, the shell weights were significantly different in each navy.
Designation | 24 cm/40 (9.45") No. 1
24 cm/40 (9.45") No. 2 |
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Ship Class Used On | No. 1 guns: Hertog Hendrik Class
No. 2 guns: Jacob van Heemskerck Class |
Date Of Design | about 1900 |
Date In Service | 1902 |
Gun Weight | 24.1 tons (24.5 mt) |
Gun Length oa | 378 in (9.600 m) |
Bore Length | 351 in (8.916 m) |
Rifling Length | 289.4 in (7.351 m) |
Grooves | (72) 0.059 D x 0.272 W in (1.5 D x 6.91 W mm) |
Lands | 0.150 in (3.8 mm) |
Twist | No. 1 Guns - Increasing RH 1 in 45 to 1 in 25
No. 2 Guns - Increasing RH 1 in 45 to 1 in 30 |
Chamber Volume | N/A |
Rate Of Fire | about 2 rounds per minute |
Type | Separate |
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Projectile Types and Weights | Common L/3,2 - 375 lbs. (170 kg)
HE L/3 - 381 lbs. (172.850 kg) |
Bursting Charge | N/A |
Projectile Length 1 | Common L/3,2 - about 30.24 in (76.8 cm)
HE L/3 - about 28.35 in (72.0 cm) |
Propellant Charge | N/A 2 |
Muzzle Velocity | No. 1 Guns - 2,690 fps (820 mps)
No. 2 Guns - 2,790 fps (850 mps) As coastal defense: 2,559 fps (780 mps) |
Working Pressure | N/A |
Approximate Barrel Life | N/A |
Ammunition stowage per gun | N/A |
Elevation | Distance |
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20 degrees | about 16,000 yards (14,630 m) |
Designation | Single Turrets: Jacob van Heemskerck (2) and Hertog Hendrik (2) |
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Weight | 194.3 tons (197.4 mt) |
Elevation | -4 / +20 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"Dutch Naval Weapons of the early 20th Century" by Stefan Boon (unpublished manuscript)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
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Collection of Netherlands Institute for Military History (NIMH) Photographs (Dutch Language)
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Special help from Kornel Hoekerd
27 August 2006 - Benchmark
02 June 2009 - Added picture of Jacob van Heemskerck
21 March 2023 - Converted to HTML 5, added details to gun, ammunition and turrets, added photographs