O 9-class submarine

O 9-class submarine
O 9
Class overview
Name:	O 9
Builders:	Koninklijke Maatschappij De Schelde, Flushing Nederlandsche Dok en Scheepsbouw Maatschappij, Amsterdam Fijenoord, Rotterdam
Operators:	Royal Netherlands Navy
Preceded by:	O 8
Succeeded by:	O 12 class
Built:	1923–1926
Completed:	3
General characteristics
Type:	Submarine
Displacement:	526 tons surfaced 656 tons submerged
Length:	54.66 m (179 ft 4 in)
Beam:	5.7 m (18 ft 8 in)
Draught:	3.53 m (11 ft 7 in)
Propulsion:	2 × 450 bhp (336 kW) diesel engines 2 × 250 bhp (186 kW) electric motors
Speed:	12 kn (22 km/h; 14 mph) surfaced 8 kn (15 km/h; 9.2 mph) submerged
Range:	3,500 nmi (6,500 km; 4,000 mi) at 8 kn (15 km/h; 9.2 mph) on the surface 25 nmi (46 km; 29 mi) at 8 kn (15 km/h; 9.2 mph) submerged
Complement:	29
Armament:	2 × 21 inch bow torpedo tubes 2 × 17.7 inch bow torpedo tubes 1 × 17.7 inch stern torpedo tubes

The O 9 class was a class of three submarines, built for the Royal Netherlands Navy. Used for patrols in the Dutch home waters. The class comprised O 9, O 10, and O 11. The submarines diving depth was 60 meters.

Construction

The ships were built by three different shipyards. O 9 was built by the Koninklijke Maatschappij De Schelde in Flushing. O 10 in Amsterdam at the Nederlandsche Dok en Scheepsbouw Maatschappij and O 11 in Rotterdam at Fijenoord shipyard.

Name	Laid down	Launched	Commissioned	Decommissioned
O 9	1 December 1923 or 23 September 1922	7 April 1925	18 January 1926	1 December 1944
O 10	24 December 1923	30 July 1925	1 September 1926	11 October 1944
O 11	24 December 1922	19 March 1925	18 January 1926	Dutch Navy: 14 May 1940 (scuttled) German navy: September 1944 (sunk)

At the time of the German invasion O 11 was under repair in Den Helder. On 14 May 1940 she was scuttled there to prevent her being captured by German forces. However the Germans raise the ship and order its repair. In September 1944 O 11 is sunk in Den Helder to block the entrance of the harbour.

External links

• Description of class