Tromp-class cruisers

Click to enlarge

 Tromp as built
Click to enlarge Jacob van Heemskerck as completed

Construction details
Name Tromp Jacob van Heemskerck
Dockyard N.V. Nederlandsche Scheepsbouw Maatschappij, Amsterdam N.V. Nederlandsche Scheepsbouw Maatschappij, Amsterdam
Ordered 1935 1935
Dockyardnumber 240 274
Laid down January 17, 1936 October 31, 1938
Launched May 24, 1937 September 16, 1939
Commissioned August 18, 1938 May 10, 1940 (prematurely, trials were scheduled for June 1940)
February 11, 1941 (after refitting in UK)
Status Click here for her history Click here for her history.
Pennants D-28 (World War 2)
KL-2 (June 15, 1946)
C-804 (October 15, 1950)
A-878 (April 1, 1955)		 D-20 (World War 2)
KL-1 (June 15 1946)
KV-1 (January 21 1947)
C-803 (October 15, 1950)
A-879 (January 15, 1955)

Specifications
Tromp Jacob van Heemskerck
Displacement 3450 tons standard
Crew 295, later increased to 380 420
Dimensions 131,95 (over all) x 12,43 x 4.32 m
Armament (as completed) 6 x 149 mm Bofors No. 11 (3x2)
4 x 40 mm Bofors (2x2)
4 x .50 * (2x2)		 10 x 10,2 cm Mk XVI* in Mk XIX mountings R.P.C.51 (5 x 2)
4 x 40 mm Vickers Mark 8 ("pompom") (1x4) ****
6 x 20 mm Hispano Suiza ** (6x1)
Added AA 4 x 75 mm (US origin)
4 x 40 mm Bofors***
6 x 20 mm Oerlikon		 8 x 40 mm Bofors Mk IV in Mk IV* mounts (4x2)
8 x 20 mm Oerlikon Mk in Mk V twin mounts (4x2).
Fire control   2 x H.A.C.S. III with R.P.C. 51 fire control systems
1 x L.A. Fire Control Table A.F.C.C. Mk VIII
2 x Mk III G.E.S. HA/LA Directors.
Anti-submarine Howaldswerke hydrophone
4 DC-throwers
Asdic		 Type 128 CV Asdic
2 depthchargerails with 12 depthcharges.
Torpedoes 6 x 533 mm (2x3)
12 torpedoes *****		 -
Radar *** *** Type 272 surface warning (removed February 1945)
Type 286 surface warning (removed February 1945)
Type SC4 air warning (fitted February 1945)
Type SG-1 surface warning (fitted February 1945)
Type 282 for Bofors 40 mm guns (fitted February 1945)
Type FC Mod.3 surface fire control (fitted August, 1945).		 Type 79B long range air warning with type 243 interrogator.
Type 277 Air- and surface craft warning with type 244 interrogator.
Type 293 Air- and surface craft warning with type 242 interrogator
2 x type 285 P4 for fire control main battery.
4 x Type 282 (fire conrol with each Bofors mounts)
Type 253 Identification Friend or Foe
Type 91 with type F.V.1 (radio countermeasures)
Air 1 Fokker C 11W floatplane -
*  These were later replaced by 2 single 20 mm-guns, in addition to the other 6 Oerlikons.
**   Later replaced by 20 mm Oerlikons
*** The original design had four twins. For some reason, Tromp only received 2. Heemskerck was to be completed with all four.
****This mount was removed when the four twin Mk IV* Bofors mounts were installed..
*****  Tromp initially carried Dutch tubes for V53 torpedoes, but the mounts were replaced by British in 1944/1945, for British Mark 9 torpedoes. The tubes were finally removed in 1946.
*** *** Radar fit Tromp pieced together based on available sources. Radar fit Van Heemskerck is an overview of outfit as of January, 1945.

Armour
Turrets 25 - 12 mm
Side belt (amidships) 15 mm
Longitudinal bulkheads 20 - 30 mm
Main deck 25 mm
Lower deck 15 - 25 mm
Ammunition lifts 15- 25 mm

Propulsion details
Boilers 4 Yarrow 3 drum
Machinery 2 Parsons geared steam turbines (built under license by N.V. Werkspoor, Amsterdam).
Performance 56.000 shp
Max speed 32,5 knots*
Bunkerage 860 t
Shafts 2
* Tromp reached 62.160 shp and 35,06 knots on her trials.

Related Links
Tromp-class cruisers photo special

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