|Name||No||Yard No||Builder||Laid down||Launched||Comp||Fate|
|SG1 (ex-Merkur, ex-Jupiter, ex-Sans Peur)||S9||A C de St. Nazaire - Penhoët||1940||2.10.1940||8.1942||surrendered 5.1945, to France 5.1945 (5/1947 survey vessel Beautemps Beaupré)|
|SG2 (ex-Uranus, ex-Saturn, ex-Sans Reproche)||T9||A C de St. Nazaire - Penhoët||1938||30.10.1940||9.1942||damaged 8.5.1943, sunk 23.9.1943|
|SG3 (ex-Jupiter, ex-Uranus, ex-Sans Souci)||311||A C de la Loire, St. Nazaire||1938||28.11.1940||11.1942||sunk 6.8.1944|
|SG4 (ex-Saturn, ex-Merkur, ex-Sans Pareil)||312||A C de la Loire, St. Nazaire||1939||28.11.1940||9.1943||surrendered 5.1945, to France 5.1945 (5/1947 survey vessel La Pérouse)|
|Displacement standard, t||
|Displacement full, t||
92.0 wl 95.0 oa
3.20 normal, 3.64 max
|No of shafts||
2 Sulzer diesels
|Power, h. p.||
|Max speed, kts||
diesel oil 256
SG1: 3 x 1 - 105/42 SK C/32, 2 x 2 - 37/80 SK C/30, 6 x 2 - 20/65 C/38
SG2: 2 x 1 - 105/42 SK C/32, 6 x 2 - 20/65 C/38, 2 x 1 - 13.2/92, 4 x 1 - 86 R Ag M42/43 AA RL
SG3: 3 x 1 - 105/42 SK C/32, 2 x 2 - 37/80 SK C/30, 7 x 2 - 20/65 C/38
SG4: 2 x 1 -105/42 SK C/32, 2 x 2 - 37/80 SK C/30, 6 x 2 - 20/65 C/38
Former French seaplane tenders, captured by German troops in St. Nazaire on the stocks in June, 1940 at various availability stages. It was originally planned to complete them as air defence and fighter direction ships (Flügsicherungsschiffe) under names Uranus, Saturnus, Jupiter and Merkur. In February, 1941, control on building was transferred to ministry of aviation, however in April, 1942 the control was returned to Kriegsmarine, and ex-depot ships were completed as fast escorts (Schnelle Geleitboote) SG1-4. They were armed by German artillery, purposed, first of all, on AA role. During service hull weakness and bad seaworthiness have come to light.
1943-1944, both survived: + FuMO 28 radar
All operated in in waters of Western France. SG1 in August, 1943 was damaged on a mine and not repaired till the end of war; in 1945 she was returned to France, named Beautemps Beaupre and BU in 1973. SG2 8.5.1943 was damaged by explosions of three mines and never repaired; 23.9.1943 she was sunk at Nantes by British aircraft. SG3 6.8.1944 was sunk by British aircraft in a mouth of Gironde. SG4 in 1945 was returned to France, named La Perouse and BU in 1969.
Many thanks to Wolfgang Stöhr for additional information on this page.