German submarine U-1023
The U-1023 in Plymouth harbour, May 1945
|Career (Nazi Germany)|
|Ordered:||13 June 1942 |
|Builder:||Blohm & Voss, Hamburg |
|Yard number:||223 |
|Laid down:||20 May 1943 |
|Launched:||3 May 1944 |
|Commissioned:||15 June 1944 |
|Fate:||Surrendered to Allies at Weymouth |
|Type:||Type VIIC/41 submarine|
|Displacement:||769 long tons (781 t) surfaced
871 long tons (885 t) submerged
|Length:||67.23 m (220 ft 7 in) o/a
50.9 m (167 ft 0 in) pressure hull
|Beam:||6.85 m (22 ft 6 in) o/a
5 m (16 ft 5 in) pressure hull
|Draft:||5 m (16 ft 5 in)|
|Propulsion:||2 × supercharged Germaniawerft 6-cylinder, 4-stroke F46 diesels totalling 2,800–3,200 hp (2,100–2,400 kW). Max rpm: 470-490
2 × electric motors, totalling 750 shp (560 kW) and max rpm: 296
|Speed:||17.7 knots (32.8 km/h; 20.4 mph) surfaced
7.6 knots (14.1 km/h; 8.7 mph) submerged
|Range:||15,170 km (8,190 nmi) at 10 kn (19 km/h) surfaced
150 km (81 nmi) at 4 kn (7.4 km/h) submerged
|Test depth:||230 m (750 ft)
Calculated crush depth: 250–295 m (820–968 ft)
|Complement:||44-52 officers & ratings|
|Armament:||5 × 53.3 cm (21 in) torpedo tubes (4 bow, 1 stern)
14 × torpedoes
1 × 8.8 cm (3.46 in) deck gun (220 rounds)
|Part of:||11th U-boat Flotilla (Front Boat), 1 March 1945–10 May 1945 |
|Commanders:||Kapitänleutnant Heinrich Schroeteler, 10 March 1945–10 May 1945|
1 warship sunk for 335 gross register tons (GRT)
German submarine U-1023 was a Type VIIC/41 U-boat of Nazi Germany's Kriegsmarine. She was laid down on 20 May 1943 by Blohm & Voss in Hamburg, Germany, and commissioned on 15 June 1944 with Oberleutnant Wolfgang Strenger in command. U-1023 sank one ship and damaged one more for a total of 7680 gross register tons. After the war she was sunk in Operation Deadlight.
Construction and design
U-1023 was ordered by the Kriegsmarine on 13 June 1942. She was laid down about one year later at Blohm & Voss, Hamburg on 20 May 1943. Almost a year later, U-1023 was launched from Hamburg on 3 May 1944. She was formally commissioned later that year on 15 July. U-1023 carried 5 × 53.3 cm (21 in) torpedo tubes (4 located in the bow, 1 in the stern) and had one 8.8 cm (3.46 in) deck gun with 220 rounds. She could also carry 14 G7e torpedoes or 26 TMA mines and had a crew of 44–52 men. She was one of the U-boats that used the Schnorchel underwater breathing apparatus.
After her redesignation as a front-line U-boat, U-1023 left port on her first and only patrol. By that time, she had moved from Kiel to her current location in Bergen via a stopover in Horten on two minor patrols. After she left on her first patrol, U-1023 intercepted the Riverton, a 7,345 tonnes (7,229 long tons) British steam merchant. She was damaged and beached off of St. Ives Bay. Later, U-1023 found the 335 ton Norwegian minesweeper NYMS 382, which was sunk with 22 dead.
Three days later, the ship surrendered at Weymouth, England. After the war she was paraded up the west coast of the UK visiting a number of ports including: Plymouth, Brixham, Falmouth, Bristol, Swansea, Liverpool, Holyhead, Manchester, Fleetwood, Belfast, Glasgow, Greenock, Rothsay, Oban. Several hundred thousand visitors were given a tour of the boat during this time. U-1023 was then used in Operation Deadlight and sunk by the Allies.
Summary of Raiding Career
|Date||Ship Name||Nationality||Tonnage (GRT)||Fate|
|23 April 1945||Riverton||United Kingdom||7,345||Damaged|
|7 May 1945||HNoMS NYMS-382||Royal Norwegian Navy||335||Sunk|
U-1023 was mounted with a single 3.7 cm Flakzwilling M43U gun on the rare LM 43U mount. The LM 43U mount was the final design of mount used on U-boats and is only known to be installed on U-boats (U-249, U-826, U-1171, U-1305 and U-1306). The 3.7 cm Flak M42U was the marine version of the 3.7 cm Flak used by the Kriegsmarine on Type VII and Type IX U-boats.
- Helgason, Guðmundur. "U-1023". German U-boats of WWII. Uboat.net. Retrieved 31 May 2010.
- Helgason, Guðmundur (U-boat patrols). "Patrol of U-boat U-1023 from 1 March 1945 to 10 May 1945". uboat.net. Retrieved 31 May 2010.
- My Grandfather Bob Brown who was Chief engineer on board during the tour.
- "U-1023 successes". UBoat.net. Retrieved 17 February 2014.