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NavSource Online:
Motor Torpedo Boat Photo Archive

RCAF Oso Yoos (B 120)
ex-RCAF Oso Yoos (M 414)
ex-PT-4


PT-4 served the U.S. Navy and Royal Canadian Air Force

58' Experimental Motor Torpedo Boat:

  • Laid down 5 August 1939 as PT-4 by the Fisher Boat Works, Detroit, MI
  • Launched 19 April 1940
  • Completed 20 June 1940
  • Placed in service and assigned to Motor Torpedo Boat Squadron ONE (PTRon 1) under the command of Lt. Earl S. Caldwell, USN
  • PTRon 1 was the first squadron commissioned, and originally was made up of experimental boats
  • The "Old Faithful", ex-"Get In Step" was transferred to the Royal Navy 11 March 1941 and reclassified HM MTB-274
  • Transfer to the Royal Navy canceled 19 April 1941, transferred instead to the Royal Canadian Air Force and named RCAF Oso Yoos (M 414) and used as a High Speed Rescue Launch
  • Reclassified B-120
  • Returned to U.S. Navy custody in 14 June 1945
  • Transferred to the War Shipping Administration in October 1946
  • Fate unknown.

    Specifications:

  • Displacement 25 t.
  • Length 58'
  • Beam 18'
  • Armament: Two twin .50 cal. machine guns
  • Propulsion: Two 1,350hp Packard gasoline engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    PT-3 145k Newspaper article on PT-4 and PT-3
    From the collection of Robert C. Houston
    Bob Houston
    PT-3 & PT-4 119k PT-3 and PT-4 Keith Brayer

    There is no DANFS history available for PT-4
    Back To The Main Photo Index Back to the Patrol Craft/Gunboat/Submarine Chaser Index Back to the Motor Torpedo Boat (PT) Photo Index

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    This page created and maintained by Joseph M. Radigan
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