NAVYPEDIA

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
UD3 (ex-O25)		667	Wilton-Fijenoord, Schiedam, Netherlands	4.1939	1.5.1940	6.1941	stricken 10.1944
UD4 (ex-O26)		209	Rotterdam Droogdok, Netherlands	4.1939	23.11.1940	1.1941	stricken 3.1945
UD5 (ex-O27)		210	Rotterdam Droogdok, Netherlands	8.1939	26.9.1941	1/1942	surrendered 5.1945, to Netherlands 7.1945 (O27)

Technical data

Displacement standard, t
Displacement normal, t	990 / 1205
Length, m	77.7
Breadth, m	6.80
Draught, m	4.00
No of shafts	2
Machinery	2 Sulzer-de Schelde diesels / 2 Schmit electric motors
Power, h. p.	5000 / 1000
Max speed, kts	19.5 / 9
Fuel, t	diesel oil 135
Endurance, nm(kts)	7100(10) / 28(8.5)
Armament	UD3, 5: 1 x 1 - 88/42 SK C/35, 2 x 1 - 20/65 C/38, 6 - 533 TT (4 bow, 2 stern, 12) UD4: 1 x 2 - 20/65 C/38, 6 - 533 TT (4 bow, 2 stern, 12)
Electronic equipment	GHG hydrophone
Complement	39
Diving depth operational, m	100

Standard scale images

Project history

Former Dutch submarines O25, O26 and O27, captured incomplete 14.5.1940 by German troops; 23.7.1940 they were renamed UD3-5. They were completed under German standards, CT and original artillery (1 single 88mm gun and 2 single 40mm MGs) were replaced by new; trainable TT mount, most likely, was never installed. UD3 and UD5 participated in operations, UD4 was used only as training boat and had no 88mm gun.

Modernizations

1942-1943, most: + FuMO 30 radar, FuMB 1 Metox ECM suite

1943-1944, most: - FuMB 1 Metox ECM suite; + FuMB 3 Bali, FuMB 6 Palau ECM suites

1944 - 1945, UD5 are rearmed with artillery consisted of 1 x 1 - 37/69 FlaK M/42, 2 x 2 - 20/65 C/38

1944-1945, some survived: - FuMO 30 radar; + FuMO 61 radar

Naval service

UD3 and UD4 were stricken in 1944-1945, both were in 1945 captured by Allies at Kiel and handed over on demolition. UD5 was returned to the Netherlands in 1945 and BU in December, 1960.