The USS Ranger, later known as USS Rockport and USS Nantucket, was a notable gunboat of the United States Navy with a long service history spanning from 1876 to 1941. Constructed by Harlan and Hollingsworth in Wilmington, Delaware, she was launched in 1876 and featured a screw steamer design equipped with full-rig auxiliary sail. Her propulsion system was a distinctive compound back-acting engine, designed by the Bureau of Steam Engineering and built by John Roach & Sons. This engine, weighing 61 tons and characterized by cylinders of 28½ and 42½ inches with a 42-inch stroke, operated at 64 rpm, driving the ship at a speed of 10 knots with 560 indicated horsepower supplied by four coal-fired Scotch boilers. Initially commissioned at League Island Naval Shipyard in Philadelphia in November 1876, Ranger served on the Atlantic Station before sailing to the Asiatic Fleet in 1877, where she protected American interests across East Asia until 1879. She was converted into a survey vessel in 1880 at Mare Island Navy Yard, engaging in hydrographic surveys off Mexico, Baja California, Central America, and the northern Pacific. Her service included a notable incident during the Barrundia Affair in 1890, when her commanding officer, Commander Reiter, became embroiled in a diplomatic controversy during Guatemala's political upheaval. Throughout her career, she was periodically decommissioned and recommissioned, serving various roles including protection of American fisheries, Central American interests, and as a training ship. Renamed Rockport in 1917 and Nantucket in 1918, she operated as a gunboat during World War I and participated in rescue operations during the Great Molasses Flood in Boston in 1919. Designated PG-23 in 1920 and IX-18 in 1921, she was transferred to the Maritime Commission in 1940 for use as a school ship and later as a training vessel for the Merchant Marine Academy, Kings Point. Her scrapping in 1958 marked the end of her long service, but her engine remains preserved at the American Merchant Marine Museum, recognized as the only known existing back-acting type engine of its kind. This vessel's extensive service history and preserved engine highlight its maritime significance as a versatile and historically important naval and training ship.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.