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	USS Ruby (PY-21)
History
United States
Name	Placida
Namesake	Placida
Builder	Bath Iron Works, Bath, Maine
Laid down	23 December 1929
Launched	17 May 1930
Acquired	1 July 1930
Fate	Purchased by the Navy 19 June 1941
History
United States
Name	Ruby
Namesake	Ruby
Acquired	19 June 1941
Commissioned	23 September 1941
Decommissioned	23 July 1945
Refit	Converted for Naval service at Gibbs Gas Engine Co., Jacksonville, Florida
Stricken	13 August 1945
Identification	Hull symbol:PY-21; Code letters:NBGM; ;
Fate	Transferred to the Maritime Commission for disposal, 26 December 1945
General characteristics
Type	Patrol yacht
Displacement	500 long tons (508 t)
Length	190 ft (58 m)
Beam	26 ft 6 in (8.08 m)
Draft	10 ft 11 in (3.33 m)
Installed power	2 × Cooper Bessemer JR-8 diesel engines; 1,600 bhp (1,200 kW);
Propulsion	2 × screws
Speed	13 knots (24 km/h; 15 mph)
Complement	67
Armament	2 × 3 in (76 mm)/50 caliber guns; 4 × 1.1 in (28 mm)/75 caliber anti-aircraft guns;

USS Ruby (PY-21) was a converted yacht that patrolled with the United States Navy in World War II.

Construction, acquisition, and commissioning

Placida—built as a diesel motor yacht in 1930 at Bath, Maine, by Bath Iron Works—was purchased by the Navy from H. G. Haskell on 19 June 1941; renamed Ruby and classified as a patrol vessel, PY-21, on 6 July 1941; converted at the Gibbs Gas Engine Company, Jacksonville, Florida; and commissioned on 23 September 1941.^[1]

Service history

Initially assigned to the 6th Naval District at Charleston, South Carolina, for escort duty, Ruby was assigned to the Eastern Sea Frontier from 10 February 1942 to 18 January 1944, retaining her homeport of Charleston. On the 18th she was reassigned to the 3d Naval District at New York, and three days later was given to the 1st Naval District, headquartered at Boston, Mass., for training purposes.^[1]

Decommission

Ruby decommissioned at Boston on 25 July 1945, was stricken from the List of Naval Vessels on 13 August 1945, and transferred to the Maritime Commission for disposal on 26 December, the day after Christmas.^[1]