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. |
|
* 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.