HMS Upholder (P37)

HMS Upholder
History
United Kingdom
Name	HMS Upholder
Builder	Vickers Armstrong, Barrow-in-Furness
Laid down	30 October 1939
Launched	8 July 1940
Commissioned	31 October 1940
Identification	Pennant number: P37
Fate	lost 14 April 1942
Badge
General characteristics
Displacement	Surfaced – 540 tons standard, 630 tons full load Submerged – 730 tons
Length	191 ft (58.22 m)
Beam	16 ft 1 in (4.90 m)
Draught	15 ft 2 in (4.62 m)
Propulsion	2 shaft diesel-electric 2 Paxman Ricardo diesel generators + electric motors 615 / 825 hp
Speed	11+1⁄4 knots (20.8 km/h) max. surfaced 10 knots (19 km/h) max. submerged
Complement	27–31
Armament	4 × bow internal 21 inch (533 mm) torpedo tubes, 2 external 10 torpedoes 1 × QF 3-inch 20 cwt gun

HMS Upholder (P37) was a Royal Navy U-class submarine built by Vickers-Armstrong at Barrow-in-Furness. She was laid down on 30 October 1939, launched on 8 July 1940 by Mrs. Doris Thompson, wife of a director of the builders. The submarine was commissioned on 31 October 1940. She was one of four U-class submarines which had two external torpedo tubes at the bows in addition to the 4 internal ones fitted to all boats. They were excluded from the others because they interfered with depth-keeping at periscope depth.