USS F-2 (SS-21)
USS "F-2" (SS-21) was an F-class submarine built for the United States Navy during the 1910s. Description. The F-class boats had a length of overall, a beam of and a mean draft of . They displaced on the surface and submerged. The F-class submarines had a crew of 1 officer and 21 enlisted men. They had a diving depth of . For surface running, the boats were powered by two NELSECO diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a electric motor. They could reach on the surface and underwater . On the surface, the boats had a range of at and at submerged. The F-class submarines were armed with four 18-inch (450 mm) torpedo tubes in the bow, no reloads were carried. Construction and career. The boat was named "Barracuda" when she was laid down by Union Iron Works of San Francisco, California, but was renamed on 17 November 1911. She was launched on 19 March 1912 sponsored by Miss A. R. Rolph, daughter of James Rolph, the mayor of San Francisco, and commissioned on 25 June 1912 with Lieutenant (junior grade) Francis T. Chew in command. "F-2  joined the 1st Submarine Group, Pacific Torpedo Flotilla, in operations between San Diego, California, and San Pedro, Los Angeles, the Flotilla's base. She continued to play an important part in developing tactics and coordinating the use of undersea craft with the fleet during an extended training period in the Hawaiian Islands from August 1914-November 1915. After lying in ordinary at Mare Island Naval Shipyard from 16 March 1916 – 13 June 1917, F-2" became flagship of Division 1, Submarine Force, Pacific Fleet. Returning to operations out of San Pedro, she participated in surface and submerged exercises, torpedo-proving practice , experiments in balancing at various depths, and trained prospective crews of new submarines. On 18 September 1919, she was placed in reserve commission at San Pedro to be used in elemental school work until decommissioned at Mare Island on 16 March 1922. She was sold on 17 August.