German submarine U-793

History
Nazi Germany
Name:	U-793
Ordered:	7 August 1942
Builder:	Blohm & Voss, Hamburg
Yard number:	456
Laid down:	1 December 1942
Launched:	4 March 1944
Commissioned:	24 April 1944
Fate:	Scuttled on 4 May 1945
Status:	Raised and taken by British, final fate unknown
General characteristics
Class and type:	Type XVIIA submarine
Displacement:	277 long tons (281 t) surfaced 309 long tons (314 t) submerged 373 long tons (379 t) total
Length:	39.05 m (128 ft 1 in) o/a 26.15 m (85 ft 10 in) pressure hull
Beam:	4.5 m (14 ft 9 in) o/a 3.3 m (10 ft 10 in) ph
Draught:	4.3 m (14 ft 1 in)
Installed power:	210–230 hp (210–230 shp; 160–170 kW) (surfaced drive) 77.5 PS (76.4 shp; 57.0 kW) (submerged electric drive) 2,500 hp (2,500 shp; 1,900 kW) (submerged HTP drive)
Propulsion:	1 × Deutz SAA 8M517 supercharged 8-cylinder diesel engine (surface drive) 1 × AEG Maschine AWT98 electric motor (submerged drive) 1 × Walter gas turbines HTP drive (submerged HTP drive) 1 shaft
Speed:	9 knots (17 km/h; 10 mph) (surfaced) 5 knots (9.3 km/h; 5.8 mph) (submerged electric drive) 25 knots (46 km/h; 29 mph) (submerged HTP drive)
Range:	2,910 nmi (5,390 km; 3,350 mi) at 8.5 knots (15.7 km/h; 9.8 mph) (surfaced) 50 nmi (93 km; 58 mi) at 2 knots (3.7 km/h; 2.3 mph) (submerged)(electric drive) 127 nmi (235 km; 146 mi) at 20 knots (37 km/h; 23 mph) (submerged HTP drive)
Capacity:	18 t (40,000 lb) (fuel oil) 43 t (95,000 lb) (H 2O 2)
Complement:	12
Armament:	2 × 53.3 cm (21 in) torpedo tubes (bow) 4 × torpedoes
Service record
Part of:	8th U-boat Flotilla (Trial boat) 24 April 1944 – 15 February 1945 5th U-boat Flotilla (Trial boat) 16 February 1945 – 4 May 1945
Commanders:	Oblt.z.S. Günther Schauenburg 24 April 1944 – 15 January 1945 Oblt.z.S. Friedrich Schmidt 16 January 1945 – 4 May 1945
Operations:	No Patrols
Victories:	None

U-793 was a Type XVIIA U-boat of Nazi Germany's Kriegsmarine during the Second World War. She was one of a small number of U-boats fitted with Hellmuth Walter's high test peroxide propulsion system, which offered a combination of air-independent propulsion and high submerged speeds. She spent the war as a trials vessel and was scuttled on 4 May 1945 in the Audorfer See, near Rendsburg.

The U-793 was laid down on 1 December 1942 at the Blohm & Voss, Hamburg, as yard number 456. She was launched on 4 March 1944 and commissioned under the command of Oberleutnant zur See Horst Heitz on 24 April 1944.

When she was completed, the submarine was 39.05 metres (128 ft 1 in) long overall, with a beam of 4.50 metres (14 ft 9 in) and a draught of 4.30 metres (14 ft 1 in). She was assessed at 309 long tons (314 t) submerged. The submarine was powered by one Deutz SAA 8M517 supercharged 8-cylinder diesel engine producing a total of 210–230 metric horsepower (150–170 kW; 210–230 shp) for use while surfaced and one Walter gas turbines producing a total of 2,500 metric horsepower (1,800 kW; 2,500 shp) for use while submerged. She had one shaft and one propeller. The submarine had a maximum surface speed of 9 knots (17 km/h; 10 mph) and a maximum submerged speed of 25 knots (46 km/h; 29 mph) using the HTP drive. When submerged, the U-boat could operate for 127 nautical miles (235 km; 146 mi) at 20 knots (37 km/h; 23 mph) on her HTP system and when surfaced, she could travel 2,910 nautical miles (5,390 km; 3,350 mi) at 8.5 knots (15.7 km/h; 9.8 mph).

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