UD-4

(ex Dutch submarine O 26)


Type O 21 - 27 Dutch design
Laid down 1938 Rotterdam, Netherlands
Commissioned * 28 Jan 1941 Krvkpt. Helmut Brümmer-Patzig
Commanders 01.41 - 10.41
10.41 - 04.42
04.42 - 05.42
06.42 - 12.42
03.43 - 11.44
11.44 - 03.45
Krvkpt. Helmut Brümmer-Patzig
Krvkpt. Rudolf von Singule
Kptlt. Hinrich-Oscar Bernbeck
Kptlt. Hinrich-Oscar Bernbeck
Krvkpt. Friedrich Schäfer
Kptlt. Fritz Bart
Career No patrols 01.41 - 04.41 1st Flotilla (Kiel) school boat
05.41 - 07.41 3rd Flotilla (Kiel) trial boat
08.41 - 12.42 5th Flotilla (Kiel) school boat
01.43 - 11.44 27th Flotilla (Gotenhafen) school boat
11.44 - 01.45 24th Flotilla (Gotenhafen) school boat
01.45 - 03.45 18th Flotilla (Hela) school boat
Successes None
Fate

Built as the Dutch submarine O 26 but had not been launched when it was captured by the Germans at the Rotterdam yard on 14 May, 1940.

Launched 23 May, 1940 and commissioned into the German Navy on 28 Jan, 1941. Out of service on 19 Mar, 1945.
Scuttled 3 May, 1945 at the Kiel Arsenal. Wreck broken up.

* Commissioned into German service.

The O 21 - 27 Class was a 1937 Dutch Navy design. They were 949tons on the surface (slightly lighter than the German type IX), had eight torpedo tubes and carried 14 torpedoes. Range was about 7100 nautical miles on the surface at 10 knots. They had a crew of about 44 men. All of the boats were fitted with a Schnorchel, years before the Germans implemented it.

3 of those boats (UD-3, UD-4 and UD-5) fell into German hands in May 1940.