German submarine U-1023

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U-1023 in Plymouth harbour in May 1945
History
Nazi Germany
NameU-1023
Ordered13 June 1942[1]
Builder
Blohm & Voss, Hamburg[1]
Yard number223[1]
Laid down20 May 1943[1]
Launched3 May 1944[1]
Commissioned15 June 1944[1]
Fate
General characteristics
Class and type
Type VIIC/41 submarine
Displacement
Length
  • 67.10 m (220 ft 2 in)
    o/a
  • 50.50 m (165 ft 8 in)
    pressure hull
Beam
  • 6.20 m (20 ft 4 in) o/a
  • 4.70 m (15 ft 5 in) pressure hull
Height9.60 m (31 ft 6 in)
Draught4.74 m (15 ft 7 in)
Installed power
  • 2,800–3,200 PS (2,100–2,400 kW; 2,800–3,200 bhp) (diesels)
  • 750 PS (550 kW; 740 shp) (electric)
Propulsion
Speed
  • 17.7 knots (32.8 km/h; 20.4 mph) surfaced
  • 7.6 knots (14.1 km/h; 8.7 mph) submerged
Range
  • 8,500 nmi (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph) surfaced
  • 80 nmi (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph) submerged
Test depth
  • 230 m (750 ft)
  • Calculated crush depth: 250–295 m (820–968 ft)
Complement44-52 officers & ratings
Armament
Service record
Part of:
Identification codes: M 38 963
Commanders:
Operations:
  • 1 patrol:
  • 25 March – 10 May 1945[1]
Victories:
  • 1 warship sunk
    (335 tons)[1]
  • 1 merchant ship damaged
    (7,345 GRT)[1]

German submarine U-1023 was a

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 7,345 GRT and 335 tons. After the war she was sunk in Operation Deadlight
.

Design

supercharged diesel engines producing a total of 2,800 to 3,200 metric horsepower (2,060 to 2,350 kW; 2,760 to 3,160 shp) for use while surfaced, two Brown, Boveri & Cie GG UB 720/8 double-acting electric motors producing a total of 750 metric horsepower (550 kW; 740 shp) for use while submerged. She had two shafts and two 1.23 m (4 ft) propellers. The boat was capable of operating at depths of up to 230 metres (750 ft).[2]

The submarine had a maximum surface speed of 17.7 knots (32.8 km/h; 20.4 mph) and a maximum submerged speed of 7.6 knots (14.1 km/h; 8.7 mph).

2 cm (0.79 in) C/30 anti-aircraft guns. The boat had a complement of between forty-four and sixty.[2]

Armament

FLAK weaponry

U-1023 was mounted with a single

2cm Flak C38 in a M 43U Zwilling mount with short folding shield on the upper Wintergarten.[3] The M 43U mount was used on a number of U-boats (U-190, U-250, U-278, U-337, U-475, U-853, U-1058, U-1109, U-1105, U-1165 and U-1306
).

  • The single 3.7 cm Flak M42U gun on the LM 43U mount.
    The single 3.7 cm Flak M42U gun on the LM 43U mount.
  • 2 cm Flak C38 in a M 43U Zwilling mount with short folding shield.
    2 cm Flak C38 in a M 43U Zwilling mount with short folding shield.

Service history

U-1023 was ordered by the Kriegsmarine on 13 June 1942. She was

Schnorchel underwater breathing apparatus.[1]

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 later location in Bergen via a stopover in

minesweeper HNoMS NYMS 382
, which was sunk with 22 dead.

Fate

U-1023 was surrendered at

Weymouth, England on 10 May 1945.[4] 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.[5] U-1023 was then used in Operation Deadlight and sunk by the Allies on 7 January 1946.[1]

Summary of raiding history

Date Ship Name Nationality Tonnage[Note 1] Fate[6]
23 April 1945 Riverton  United Kingdom 7,345 Damaged
7 May 1945 HNoMS NYMS-382  Royal Norwegian Navy 335 Sunk

See also

References

Notes

  1. gross register tons. Military vessels are listed by tons displacement
    .

Citations

  1. ^ a b c d e f g h i j k l m n o p Helgason, Guðmundur. "The Type VIIC/41 U-boat U-1023". German U-boats of WWII - uboat.net. Retrieved 31 May 2010.
  2. ^ a b c d Gröner 1991, pp. 43–46.
  3. ^ Base on war-time photographs.
  4. ^ Helgason, Guðmundur. "Patrol of U-boat U-1023 from 1 Mar 1945 to 10 May 1945". German U-boats of WWII - uboat.net. Retrieved 31 May 2010.
  5. ^ My Grandfather Bob Brown who was Chief engineer on board during the tour.
  6. ^ Helgason, Guðmundur. "Ships hit by U-1023". German U-boats of WWII - uboat.net. Retrieved 17 February 2014.

Bibliography

External links

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