R boat

Aldebaran class R boat
Class overview
Name	Räumboote or Minenräumboote
Builders	Abeking & Rasmussen
Operators	Kriegsmarine  German Mine Sweeping Administration
General characteristics
Type	Minesweeper
Displacement	160 t (max)
Length	41.1 m (134 ft 10 in)
Beam	5.80 m (19 ft 0 in)
Draught	1.60 m (5 ft 3 in)
Propulsion	2x MAN diesel engines; 1,836 hp
Speed	20 kn (37 km/h; 23 mph)
Range	1,100 NM (2,000 km)
Complement	up to 38
Armament	1 × 3.7 cm (1.5 in) SK C/30 cannon 2 × 2 cm (0.79 in) C/30 cannon 7.92 mm machine guns, mines and depth charges

R boats operating near the coast of occupied France

R boats inline, 1939

Steam R boats at work, 1938

The R boats (Räumboote in German, meaning minesweeper) were a group of small naval vessels built as minesweepers for the Kriegsmarine (German navy) before and during the Second World War. They were used for several purposes during the war, and were also used post-war by the German Mine Sweeping Administration for clearing naval mines.

Operational use

A total of 424 boats were built for the Kriegsmarine before and during World War II. The German Navy used them in every theatre including the Baltic, Mediterranean and the Black Sea. In addition to its designed use as minesweepers, these boats were used for convoy escort, coastal patrol, minelaying and air-sea rescue.

About 140 R boats survived the war and these were distributed amongst the Allies. Some were used by the German Mine Sweeping Administration (GMSA) to clear western Europe of naval mines. Twenty-four boats were transferred back to the post-war German Navy, the Bundesmarine, in 1956 and were used until the late 1960s. An unusual feature of these ships is the use of Voith Schneider Propellers on approximately one quarter of the boats for extra maneuverability.

Additionally, dozens of captured vessels from France, United Kingdom, the Netherlands and Italy were used as foreign R-boats (R-boote Ausland) and were designated with RA-, RH- and RD- prefixes. A further 8 coastal motor fishing boats were designated as auxiliary R-boats and named R111-R118 in the 11th R-boat flotilla.

R boat classes

Class	Boats in class	Displacement	Length	Builders	Notes
R1	R1–R16	60 long tons (61 t)	26 m	Lürssen, Bremen-Vegesack Abeking & Rasmussen, Lemwerder Schlichting, Travemünde	Built 1929–34
R17	R17–R24	115 tons	37 m	Schlichting, Travemünde, Abeking & Rasmussen	Built 1934–38
R25	R25–R40	110 tons	35.4 m	Abeking & Rasmussen Schlichting, Travemünde	Built 1938–39
R41	R41–R129	125 tons	37.8 m	Abeking & Rasmussen Schlichting, Travemünde	Built 1939–43
R130	R130–150	150 tons	41.1 m	Abeking & Rasmussen	Built 1943–44
R151	R151–217	125 tons	35.4 m		Built 1940–43
R218	R218–300	140 tons	39.2 m		Built 1943–45, R291–300 unfinished at the end of the war
R301	R301–312	160 tons	41 m		Built 1942–45, two 533 mm torpedo tubes added
R401	R401–448	140 tons	39.2 m		Launched 1943–45 mostly not completed at end of the war

R boat units

Main article: Minesweeper flotilla (Kriegsmarine)

In the inter-war years and during the Second World War, a total of twenty Räumboots-Flottille (German for "Minesweeper Flotillas") were created. While most were dissolved late in the war or after the German surrender, a few were kept for use by the German Mine Sweeping Administration (GMSA) and dissolved post-war. An additional flotilla was created in the immediate post-war, also for use by the GMSA.

See also

• Schnellboot, known to the Allies as E-Boats
• Motor Launch for the British equivalents
• M-class minesweeper (Germany) for larger German World War 2 minesweepers
• Sperrbrecher for another type of German World War 2 minesweeper

References

Bibliography

• Conway's All The World's Fighting Ships 1922–1946
• Hervieux, Pierre "German Motor Minesweepers at War 1939–1945" in Warship 2002–2003, Conway's Maritime Press
• Lenton, H. T. German Warships of the Second World War. London: Macdonald and Jane's, 1975. ISBN 0356-04661-3.

Online sources

• R Boat at German Navy.de
• (in German) Räumboots-Flottillen at Lexikon der Wehrmacht.de

Further reading

• Erich Gröner; Dieter Jung; Martin Maass (November 1991). German Warships, 1815–1945: U-Boats and Mine Warfare Vessels (rev. ed.). Naval Inst Press. ISBN 978-1-55750-301-5.