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Motor Torpedo Boat Photo Archive

HM MTB-421

Call sign:
Nan - William - Oboe - William

PT-91 served only in the Royal Navy

78' Higgins Motor Torpedo Boat:

  • Laid down 5 June 1942 as PT-91 by Higgins Industries, New Orleans, LA
  • Launched 3 November 1942
  • Completed 17 December 1942
  • Transferred to the Soviet Union 15 February 1943 as RPT-7
  • Transfer canceled due to Spring convoys to the Soviet Union being halted
  • Transferred in April 1943 to Great Britain, commissioned HM MTB-421 and assigned to the 7th MTB Flotilla
  • Commanded by T/Lt. Robert Varvillin, RNVR from 8 January 1944 to October 1944
  • Returned to U.S. Navy custody 8 September 1945 and destroyed.


  • Displacement 56 t.
  • Length 78'
  • Beam 20' 8"
  • Draft 5' 3"
  • Speed 40 kts.
  • Complement 17
  • Armament: Four 21" torpedoes, one 40mm mount and two twin .50 cal. machine guns
  • Propulsion: Three 4,500shp Packard W-14 M2500 gasoline engines, three shafts.
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    No image of PT-91 is available at this time

    There is no DANFS history available for PT-91
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