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FIGHTING SHIPS OF THE WORLD
NETHERLANDS
SUBMARINES
O21 submarines (1940, 1942/1945)


Photo



O25 Many thanks to Wolfgang Stöhr for additional information on this page.

Ships


Name No Yard No Builder Laid down Launched Comp Fate
O21 (ex-K XXI) S801 207 De Schelde, Vlissingen 11.1937 21.10.1939 5.1940 stricken 11.1957
O22 (ex-K XXII)   208 De Schelde, Vlissingen 11.1937 20.1.1940 5.1940 sunk 8?.11.1940
O23 (ex-K XXIII)   205 Rotterdamse Droogdok Mij, Rotterdam // Thornycroft, Southampton, UK 10.1937 5.12.1939 6.1940 stricken 12.1948
O24 (ex-K XXIV) S804 206 Rotterdamse Droogdok Mij, Rotterdam // Thornycroft, Southampton, UK 11.1937 18.3.1940 7.1940 stricken 2.1954
O25 (ex-K XXV)   663 Wilton-Fijenoord, Schiedam 4.1939 1.5.1940 6.1941 // --- captured incomplete by Germany 5.1940 (UD3)
O26 (ex-K XXVI)   209 Rotterdamse Droogdok Mij, Rotterdam 4.1939 23.11.1940 1.1941 // --- captured incomplete by Germany 5.1940 (UD4)
O27 (ex-K XXVII) S807 210 Rotterdamse Droogdok Mij, Rotterdam 8.1939 26.9.1941 1.1942 // 7.1945 captured incomplete by Germany 5.1940 (UD5), returned 5.1945, stricken 11.1959


Technical data


Displacement standard, t

902

Displacement normal, t

990 / 1205

Length, m

77.7

Breadth, m

6.80

Draught, m

3.95

No of shafts

2

Machinery

2 Sulzer 7-cyl diesels / 2 electric motors

Power, h. p.

5000 / 1000

Max speed, kts

19.5 / 9

Fuel, t

diesel oil

Endurance, nm(kts)

10000(12) / 28(8.5)

Armament

O21-23: 1 x 1 - 88/42 Bofors No.3, 1 x 1 - 40/36 Bofors, 1 x 1 - 12.7/90, 8 - 533 TT (4 bow, 2 stern, 1 x 2, 14)

O24: 1 x 1 - 88/42 Bofors No.2, 1 x 1 - 20/70 Oerlikon, 1 x 1 - 12.7/90, 8 - 533 TT (4 bow, 2 stern, 1 x 2, 14)

O27 (1945): 1 x 1 - 37/69 Flak M/42, 2 x 2 - 20/65 C/38, 6 - 533 TT (4 bow, 2 stern, 12)

Electronic equipment

O21-24: Atlas-built sonar

O27 (presumably): FuMO 30 or FuMO 61 radar, GHG hydrophone, FuMB 3 Bali, FuMB 6 Palau ECM suites

Complement

39

Diving depth operational, m

100



Standard scale images


<i>O21</i> 1940
O21 1940
<i>O27</i> 1945
O27 1945


Graphics


<i>O25</i> <i>Many thanks to Wolfgang Stöhr for additional information on this page.</i>
O25 Many thanks to Wolfgang Stöhr for additional information on this page.


Project history

Ordered as K XXI-XXVII, however "K" letters have been changed on "O" even prior to the beginning of building. Practically repeated O19 class, but without minelaying equipment. Double-hulled, maximal diving depth was 175m. They were equipped by 7cyl Sulzer diesels with snorkel. Thanks to the improved hull form and increase in machinery power max speed has grown. On these submarines they have refused centralized operation by ballast tank valves for diving time reduction.

In May, 1940 yet incomplete O21-24 were formally commissioned and escaped to Britain where have been completed, thus snorkel was removed.

Incomplete O25-27 in May, 1940 were captured by Germans and as UD3-5 were completed for Kriegsmarine under modified design. UD3 and UD4 were stricken and scuttled at Kiel 3.5.1945, subsequently they were salvaged and scrapped. UD5 was returned to the Netherlands in 1945.

Modernizations

1942, O21, 23: - 1 x 1 - 40/36, Atlas-built sonar; + 1 x 1 - 20/70 Oerlikon Mk II/IV, type 291W radar, type 129, type 138 sonars (presumably)

early 1950s, all survived: all guns were removed.

Naval service

O22 was lost on a mine in the North Sea in the period 7 till 19.11.1940.



Many thanks to Wolfgang Stöhr for additional information on this page.