German submarine U-651

German submarine U-651 was a German Type VIIC U-boat built for Nazi Germany's Kriegsmarine for service during World War II. She was ordered just after the war started in 1939, laid down on 16 January 1940, launched on 21 December that year and commissioned the following 21 February. She was commanded by Kapitänleutnant Peter Lohmeyer.

Her career was a short one. She took part in only one patrol and sank two ships in convoy Convoy HX 133: the merchantmen Brockley Hill and SS Grayburn. On 29 June 1941, she was sunk by the escort for the same convoy but 45 of her crew were rescued by the Royal Navy and interrogated by the Admiralty.

Design
German Type VIIC submarines were preceded by the shorter Type VIIB submarines. U-651 had a displacement of 769 t when at the surface and 871 t while submerged. She had a total length of 67.10 m, a pressure hull length of 50.50 m, a beam of 6.20 m, a height of 9.60 m, and a draught of 4.74 m. The submarine was powered by two Germaniawerft F46 four-stroke, six-cylinder supercharged diesel engines producing a total of 2800 to 3200 PS for use while surfaced, two Siemens-Schuckert GU 343/38-8 double-acting electric motors producing a total of 750 PS for use while submerged. She had two shafts and two 1.23 m propellers. The boat was capable of operating at depths of up to 230 m.

The submarine had a maximum surface speed of 17.7 kn and a maximum submerged speed of 7.6 kn. When submerged, the boat could operate for 80 nmi at 4 kn; when surfaced, she could travel 8500 nmi at 10 kn. U-651 was fitted with five 53.3 cm torpedo tubes (four fitted at the bow and one at the stern), fourteen torpedoes, one 8.8 cm SK C/35 naval gun, 220 rounds, and a 2 cm C/30 anti-aircraft gun. The boat had a complement of between forty-four and sixty.

Ships credited for the sinking of U-651
Destroyers Corvettes Minesweeper
 * HMS Malcolm (D19)
 * HMS Scimitar (H21)
 * HMS Arabis (K73)
 * HMS Violet (K35)
 * HMS Speedwell (J87)