HNLMS O 11

Design and description

The O 9-class submarines were smaller versions of the designed for home waters. The boats had a length of overall, a beam of and a draft of. They displaced on the surface and submerged. The submarines had a crew of 29 officers and enlisted men.
For surface running, the boats were powered by two Sulzer diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater. On the surface, the boats had a range of at and at submerged. The submarines had a diving depth of.
The O 9 class was armed with a pair of torpedo tubes in the bow and three tubes. Two of these were in the bow and one in the stern. Each tube was provided with a reload torpedo. They were also armed with a deck gun and a machine gun.

Construction and career

O 11 was ordered on 30 August 1921 and laid down on 24 December 1922 at Fijenoords shipyard in Rotterdam. The boat was launched on 19 March 1925 and commissioned on 18 January 1926.
On 6 March 1940, O 11 was accidentally rammed by the tugboat BV 3 in Den Helder. In the collision three men of O 11 died. The boat was refloated and repair began at the Den Helder Navy Yard. The repairs were not completed when Germany invaded the Netherlands on 10 May and the boat was scuttled to prevent her capture four days later. The Germans raised the boat, but nothing else with it. The boat was scuttled again in September 1944 in order to block the entrance of Den Helder harbor. O 11s wreck was refloated after the war and sold for scrap on 10 December 1947.