(SP-585: dp. 37; l. 64'; b. 13'6" ; dr. 3'3" ; s. 10 k.; a. 1 1-pdr.)
A former name retained.
Helianthus, a motor boat, was built by Herreshoff Manufacturing Co., Bristol, R.I., in 1912, and acquired by the Navy from N. A. Herreshoff; delivered 11 June 1917 and commissioned 6 July 1917, Boatswain T. H: Rich in command.
Helianthus was assigned to the 2d Naval District as a section patrol craft, and operated on Harbor Patrol and Harbor Entrance Patrol in Narragansett Bay and Newport, R.I. She was transferred 28 March ' 1919 to the Coast and Geodetic Survey.