Description

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.

Gun Characteristics

Designation 24 cm/40 (9.45") No. 1
24 cm/40 (9.45") No. 2
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

Ammunition

Type Separate
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
  • ^In 1913 longer shells were ordered and existing shells were to receive a longer nose. In 1916 a more slender nose variant was supplied to Hertog Hendrik.
  • ^Propellant appears to have been in a single charge.

Range

Range with 375 lbs. (170 kg) AP
Elevation Distance
20 degrees about 16,000 yards (14,630 m)

Mount/Turret Data

Designation Single Turrets: Jacob van Heemskerck (2) and Hertog Hendrik (2)
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

Additional Pictures

Sources

"Dutch Naval Weapons of the early 20th Century" by Stefan Boon (unpublished manuscript)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

Page History

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