Class Boats in class Displacement Length Builders[1] Notes R1 R1–R16 60 long tons (61 t) 26 m Lürssen, Bremen-Vegesack Abeking & Rasmussen, Lemwerder Schlichting, Travemünde Built 1929–34[2] R17 R17–R24 115 tons 37 m Schlichting, Travemünde, Abeking & Rasmussen Built 1934–38[3] R25 R25–R40 110 tons 35.4 m Abeking & Rasmussen Schlichting, Travemünde Built 1938–39[3] 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[4] 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