Please report any broken links or trouble you might come across to the Webmaster. Please take a moment to let us know so that we can correct any problems and make your visit as enjoyable and as informative as possible.

NavSource Online:
Patrol Yacht Photo Archive

Ruby (PY 21)

Call sign:
Nan - Baker - George - Mike

Patrol Yacht:

  • Built in 1930 as the yacht Placida by Bath Iron Work, Inc., Bath, Maine
  • Purchased by the Navy 19 June 1941
  • Renamed Ruby and designated as a Patrol Yacht PY-21, 6 July 1941
  • Commissioned 23 September 1941 at Jacksonville, FL
  • Decommissioned 25 July 1945 at Boston, MA
  • Struck from the Naval Register 13 August 1945
  • Transferred 26 December 1945 to the Maritime Commission for disposal
  • Fate unknown.


  • Displacement 640 t.
  • Length 190' 11"
  • Beam 26' 6"
  • Draft 10' 6"
  • Speed 13.5 kts.
  • Complement 67
  • Armament: One 3"/50 dual purpose gun mount and four 1.1"/75 caliber anti-aircraft guns
  • Propulsion: Two 1,600bhp Cooper Bessemer JR-8 diesel engines, two shafts.
    Click on thumbnail
    for full size image
    Size Image Description Source
    Motor Yacht Placida
    Ruby 136k . .
    USS Ruby (PY 21)
    Ruby 110k . .
    Ruby 290k 19 November 1942
    Charleston Navy Yard, Charleston, SC
    Moored behind Ruby (PY 21) in Dry Dock No. 2 along with Army dredge Howell, Army QTR No. 2, Army barges No. 7, 17 and 4, YC-579, and YP-429
    U.S. Navy photo 1756-42
    Robert Hall
    Ruby 77k 8 March 1943 .

    View the Ruby (PY 21)
    DANFS History entry located on the Naval History and Heritage Command Website
    Back To The Main Photo Index Back to the Patrol Craft/Gunboat/Submarine Chaser Index Back to the Patrol Yacht (PY) Photo Index

    Comments, Suggestions, E-mail Webmaster

    This page created by Gary P. Priolo and maintained by Joe Radigan
    All pages copyright NavSource Naval History