Jacob van Heemskerck

Improved Hertog Hendrik-type.

Click to enlarge
Jacob van Heemskerck in her original condition (collection J. Klootwijk)

Construction details
Name Jacob van Heemskerck
Dockyard Rijkswerf, Amsterdam
Laid down August 15 1905
Launched September 22 1906
Commissioned April 22 1908
Pennants HW-3
A-881
Status Commissioned as the stationary battery "Batterijschip IJmuiden" on April 19 1939 and stationed in IJmuiden. Scuttled by own crew May 14 1940 to avoid capture. Wreck was raised on July 16 1940 and towed to Amsterdam on July 24. Towed to Kiel in March 1941 and rebuilt at the Howaldtswerke to the floating anti-aircraft battery "Undine. Recovered in Wilhelmshafen. Rebuilt as accommodation ship at the Rijkswerf Amsterdam and commissioned as such on February 23 1948 as Hr. Ms. Neptunus. Decommissioned on September 13 1974 and stricken October 4 1974.

Specifications
Dutch navy Kriegsmarine
Displacement 5000 tons 4445 tons
Crew 351  
Dimensions 98 x 15,20 x 5,70 m
Armament* 2 x 240 mm No 2  **
6 x 150 mm
6 x 75 mm
4 x 37 mm
8 x 105 mm
4 x 37 mm
16 x 20 mm
Fire control Rudimentary 1 Würzberg radar
2 optical range finders
* All armament was removed during her conversion to an accommodation ship

Armour details
Main belt 102-152 mm
Bulkheads 152 mm
Main deck 51 mm
Main turrets 102 mm
Secondary turrets  
Barbettes 197 mm
Barbettes 152 mm
Conning tower 194 mm

Propulsion details
Boilers 6 Yarrow
Machinery 2 Triple expansion engines
Performance 6400 hp
Shafts 2
Bunkerage 610 tons coal
Range 3300 miles @ 10 knots
Speed 16,5 knots
Notes The Undine didn't retain her propulsion system and had to be towed.

Back Home