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Jacob van Heemskerck 1913

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
Jacob van Heemskerck, 4.1939- Ijmuiden			Rijkswerf Amsterdam	15.8.1905	22.9.1906	22.4.1908	scuttled 14.5.1940

Technical data

Displacement normal, t	4920
Displacement full, t
Length, m	98.0 oa
Breadth, m	15.2
Draught, m	5.69 max
No of shafts	2
Machinery	2 VTE, 8 Yarrow boilers
Power, h. p.	6400
Max speed, kts	16.5
Fuel, t	coal 680
Endurance, nm(kts)	3300(10)
Armour, mm	belt: 150 - 100, bulkheads: 150, deck: 50, main turrets: 100, barbettes: 200 - 100, CT: 195
Armament	2 x 1 - 238/37 Krupp No.2, 6 x 1 - 149/37 Krupp No.5, 6 x 1 - 75/37 Krupp No.1, 4 x 1 - 37/20 Hotchkiss, 2 - 450 TT (beam)
Complement	340

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Project history

Slightly improved version of Tromp design, continuing a line of Dutch coast defence ships, begun late XIX century from Evertsen class. Jacob van Heemskerck differed from Tromp hardly in the smaller dimensions and presence of two additional 15cm guns amidships.

Ship protection

Armoured belt protected full ship length, 150mm-thick part between main turrets was closed by 150mm bulkheads. Main 50mm deck was connected with upper edge of the belt.

Modernizations

1929: - 2 x 1 - 149/37.

1939: - 4 x 1 - 149/37, 6 x 1 - 75/37, 4 x 1 - 37/20, 2 - 450 TT; + 2 x 1 - 40/56 Bofors No.4.

Naval service

Jacob van Heemskerck was converted 19.4.1939 to floating battery (Batterijschip) and renamed Ijmuiden. She was partially disarmed. Ijmuiden was scuttled by crew 14.5.1940, raised by Germans 16.7.1940 and subsequently converted to non-self-propelled AA floating battery Undine. Ship was returned in 1945, converted on Amsterdam DYd to barrack ship and commissioned again under name Neptunus 23.2.1948. Ship was disbanded 13.9.1974 and stricken 4.10.1974. Hull was preserved up to now.