German submarine U-423
|Ordered:||10 April 1941|
|Builder:||Danziger Werft, Danzig|
|Laid down:||16 March 1942|
|Launched:||7 November 1942|
|Commissioned:||3 March 1943|
|Fate:||Sunk by a Norwegian aircraft northeast of the Faroe Islands, June 1944|
|Class and type:||Type VIIC submarine|
|Height:||9.60 m (31 ft 6 in)|
|Draught:||4.74 m (15 ft 7 in)|
|Complement:||4 officers, 40–56 enlisted|
|Operations:||9 – 17 June 1944|
She carried out one patrol. She did not sink or damage any ships.
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-423 had a displacement of 769 tonnes (757 long tons) when at the surface and 871 tonnes (857 long tons) while submerged. She had a total length of 67.10 m (220 ft 2 in), a pressure hull length of 50.50 m (165 ft 8 in), a beam of 6.20 m (20 ft 4 in), a height of 9.60 m (31 ft 6 in), and a draught of 4.74 m (15 ft 7 in). The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder 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 Siemens-Schuckert GU 343/38–8 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).
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). When submerged, the boat could operate for 80 nautical miles (150 km; 92 mi) at 4 knots (7.4 km/h; 4.6 mph); when surfaced, she could travel 8,500 nautical miles (15,700 km; 9,800 mi) at 10 knots (19 km/h; 12 mph). U-423 was fitted with five 53.3 cm (21 in) torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm (3.46 in) SK C/35 naval gun, 220 rounds, and an anti-aircraft gun. The boat had a complement of between forty-four and sixty.
The submarine was laid down on 16 March 1942 at the Danziger Werft (yard) at Danzig (now Gdansk), as yard number 124, launched on 7 November and commissioned on 3 March under the command of Oberleutnant zur See Joachim Methner.
She served with the 8th U-boat Flotilla from 3 March 1943 until her loss.
Patrol and loss
The boat's only patrol commenced with her departure from Kiel on 9 June 1944. On 17 June, she was sunk northeast of the Faroe Islands by depth charges dropped from a Norwegian PBY Catalina flying boat of No. 333 Squadron RAF.
Fifty-three men went down with the U-boat; there were no survivors.
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