O 9 class submarine

O 9
Class overview
Name:	O 9 class
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.

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.

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 raised the ship and ordered it repaired. In September 1944 O 11 was sunk in Den Helder to block the entrance of the harbour.

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