The yacht was designed by Gardner and Cox of New York and under construction as hull 295 by Delaware River Iron Shipbuilding and Engine Works (also known as John Roach & Company), of Chester, Pennsylvania The Navy inspected the vessel before completion and purchased it contingent on a guarantee of a speed of 15 kn (17 mph; 28 km/h). The builder agreed even though the original design speed was 14 kn (16 mph; 26 km/h). The builder specifications were extreme length of 152 ft (46.3 m), 20 ft (6.1 m) beam, 10 ft 6 in (3.2 m) depth and draft of 8 ft 9 in (2.7 m). A number of structural changes were required to make the change from a prospective pleasure yacht to a naval gunboat. Guest staterooms were converted to into crew space and magazines and other naval space requirements. Two Almay water tube boilers provided steam for the vertical triple expansion steam engine. The engine out performed the guarantee requirement and averaged 16 kn (18 mph; 30 km/h) over six hours during trials with an indicated 600 horsepower with a low rate of coal consumption. Coal capacity was 50 tons. A three bladed 6 ft 3 in (1.9 m) steel propeller drove the yacht. A General Electric dynamo, located in the engine room was rated at illumination of 100 16 candle power lights. Equipped for blockade duty the patrol yacht mounted a 6 pounder on both bow and stern with a 3 pounder broadside gun on each side. Ammunition storage was fore and aft below the water line.^{[5][note 2]}

Sylph was commissioned on 18 August 1898 at the Norfolk Navy Yard. She was the third U.S. Navy ship to bear the name.^[2][3]

Soon after commissioning, Sylph was assigned to the Washington Navy Yard, where she served as a yacht for the President and other high officials. President McKinley was the first President to use her. In 1902, she began alternating with first Dolphin then Mayflower as the President's yacht, and she also served the Secretary and Assistant Secretary of the Navy in the same manner. President Theodore Roosevelt frequently cruised in Sylph to his home at Oyster Bay, New York, and President William Howard Taft used her for excursions off the New England coast during the summers of his term.^[2]

The yacht was assigned to take President Taft's sister-in-law, Eleanor More who had been caring for Mrs. Taft after a stroke, to visit her summer cottage at Biddeford Pool off Saco Bay in Maine. On the evening of 30 July 1909 Sylph anchored off the mouth of the Saco River. Capt. Earnest Vinton of Saco sold tickets for a moonlight sightseeing trip to the yacht. On arrival at the lit yacht passengers gathered on the port side of the overloaded motor launch Item causing it to capsize. The commander of Sylph ordered its tender to the rescue and turned searchlights on the area. Three of the passengers were lost, one dying after rescue, with one body recovered two weeks later. A coroner's inquiry revealed that Item was designed for an engine weighing more than two tons but that engine had been replaced by one only 10% of the weight making the vessel unstable and unsafe for carrying passengers. No charges were filed as Vinton had complied with the only regulations in effect for life jackets.^[6][7]

More often, Sylph cruised up and down the Potomac River, near Washington, D.C. She went on sightseeing excursions in Chesapeake Bay and to George Washington's home at Mount Vernon, Virginia, on the Potomac just below Washington. Among her famous passengers, the yacht numbered the King of Belgium and the Crown Prince of Sweden.

Woodrow Wilson was the last President to use Sylph as the presidential yacht. After his term of office, she operated from the Washington Navy Yard for the Secretary and Assistant Secretary of the Navy and often marked pleasure cruises to Mount Vernon with patients of the Naval Hospital embarked. On 24 January 1921, she was called upon to carry the body of the late minister of Sweden down the Potomac and through the over Chesapeake Bay to Hampton Roads.^[2] On 12 October 1935 Franklin D. Roosevelt recounted in his message regarding the restoration of Stratford Hall a trip he made during his service in the Wilson Administration (Assistant Secretary of the Navy (1913–1919)) with a group traveling aboard "the small Presidential Yacht Sylph" to visit the ruin of the plantation "at an apparently uninhabited section of the lower Potomac."^[8]

Sylph continued in special service at Washington throughout her career. On 17 July 1921, she received the alphanumeric designation, PY-5. She continued to cross the Potomac and Anacostia Rivers until 19 November 1928, when she moored at the Washington Navy Yard to remain for the rest of her career.^[2]

On 2 April 1929, Sylph was taken in tow to Norfolk, Virginia. On the 27th, she was decommissioned there, and her name was struck from the Navy list two days later. On 26 November 1929, her hulk was sold to Mr. Frank B. Clair of Brooklyn, New York.^[2]

Civilian vessel edit

Sylph first served as a deep sea party fishing vessel, open to the public and operating out of Sheepshead Bay, Brooklyn.^[9] The 1931 U.S. registry shows owner being Frank P. Clair, in passenger service with a crew of 7 registered at New York, N.Y. The vessel's registered data was 149 GRT, 101 NRT, 136 ft (41.5 m) registry length, 19.8 ft (6.0 m) beam with a depth of 10.4 ft (3.2 m) and 550 horsepower.^[4] In 1939 Sylph became a ferry making scheduled commuter runs from Manhattan to Sea Gate, Brooklyn until about 1950 when the service and vessel were abandoned.^{[9][note 3]} New York Waterways and Yacht Cruises was the operator 1939 to 1943 when the vessel went out of documentation.^[10] The ferry was abandoned at the pier at West 37th Street, Brooklyn. The abandoned vessel was intact until storms and fires leveled the pier and wreck to the waterline. Some remains are still visible after storms shift sands that normally cover the remnants.^[9]

Owners Frank B. Clair and the 1939 registered owner, John W. Nugent, were owners of the vessel through both the fishing and ferry enterprise. At some point they apparently borrowed from the Worthington Diesel Company and converted from steam engine to a Worthington diesel. In 1941 they defaulted and Worthington took possession of the vessel which apparently it later abandoned.^[11]

• This article incorporates text from the public domain Dictionary of American Naval Fighting Ships.

• The Floating White House
• U.S.S. Sylph, Selected by the Navy Department as the President's Yacht (Marine Engineering; October 1898, pp. 1–4, photo, drawings (outboard profile & accommodations plan) & specifications.)
• NavSource Online — Patrol Yacht Photo Archive: Sylph (PY-5)