Allied Warships


O class

9 ships

The submarine HMS Oberon (N 21) of the Royal Navy.

Technical information

Displacement1475 / 2030 BRT 
Length283.5 feet 
Complement6 officers + 47 men 
Armament1 4" gun
8 21" torpedo tubes (6 bow, 2 stern) 
Max speed17.5 / 9 knots (surfaced/submerged)
EnginesDiesel / electric, 2 shafts 
Power4400 / 1350 HP  (surfaced/submerged)
Notes on class

This class was diverted into three groups. Oberon was built as a prototype. Otway and Oxley were built for Australia but were returned to the R.N. some years after completion due to financial reasons, these ships were known as the Oxley group. The remaining six ships were the Odin group.

Specifications as given above are for the Odin group.

Oberon (prototype);
Displacement: 1311 / 1831 BRT
Lenght: 275 feet
Speed: 15 / 9 knots
Power: 2950 / 1350 HP
Otherwise same as above.

Oxley group;
Displacement: 1350 / 1870 BRT
Lenght: 278.5 feet
Speed: 15.5 / 9 knots
Power: 2950 / 1350 HP
Otherwise same as above.

Submarines of this class that have detailed patrol info added are shown in bold in the list below.


All ships of the O class

Odin Group

Royal Navy Royal Navy (more on Royal Navy)

HMS Odin (N 84) Lost on Jun 1940
HMS Olympus (N 35) Lost on 8 May 1942
HMS Orpheus (i) (N 46) Lost on Jun 1940
HMS Osiris (N 67)
HMS Oswald (N 58) Lost on 1 Aug 1940
HMS Otus (N 92)

Oxley Group

Royal Navy Royal Navy (more on Royal Navy)

HMS Otway (N 51)
HMS Oxley (55 P) Lost on 10 Sep 1939


Royal Navy Royal Navy (more on Royal Navy)

HMS Oberon (N 21)

9 Submarines of the O class. 5 of them were lost.

Full wartime service history on this vessel.

See all Submarine classes.

Fighting Captain, The

Burn, Alan

Books dealing with this subject include:

Abandon Ship!, Newcomb, Richard F., 2000
Above Us the Waves, Warren, C.E.T. and Benson, James, 1971 (transl.)
Advance Force - Pearl Harbor, Burlingame, Burl, 2002
Air war over the nore, Jonathan Sutherland, 2010
Aircraft Versus Submarine, Price, Alfred, 1980 (transl.)
Airships vs. Submarines, Van Treuren, Richard G., 2009
Allied Submarine Attacks of World War Two, Rohwer, J├╝rgen, 1997
Allied Submarines, Watts, Anthony J., 1977
Allied Submarines of World War Two, Poolman, Kenneth, 1990 (transl.)
American Submarine War Patrol Reports: U.S.S. Wahoo (SS-238), McDaniel, J.T. (editor), 2003
American Submarines, Lenton, H.T., 1973
Assault on a Queen, Finney, Jack, 1959
Axis Submarines, Watts, Anthony J., 1977
Bacalao, McDaniel, J.T., 2004
Back from the Deep, LaVO, Carl, 1998

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