V-1 was completed with two Busch-Sulzerdirect-drive 6-cylinder 2-cycle main diesel engines of each, along with two Busch-Sulzer auxiliary diesel engines of each, driving electrical generators. The latter were primarily for charging batteries, but to reach maximum surfaced speed, they could augment the mechanically coupled main-propulsion engines by driving the 1,200 hp electric motors in parallel via an electric transmission. Although it wasn't until about 1939 that its problems were solved, electric transmission in a pure diesel-electric arrangement became the propulsion system for the successful fleet submarines of World War II, the Tambor-class through the Tench-class. Prior to recommissioning in 1940, the auxiliary diesels were replaced with two BuEngMaschinenfabrik Augsburg Nürnberg AG 6-cylinder 4-cycle diesel engines of each. In 1942-43 Barracuda was converted to a cargo submarine, with the main engines removed to provide cargo space, significantly reducing her speed on the remaining auxiliary diesels.
Construction
V-1 had been commissioned in 1924 for surface running only, to permit an early trial of her engines. She was assigned to Submarine Division 20 and, after cruising along the New England coast, sailed on 14 January 1925 on a surface cruise of the Caribbean Sea, returning in May 1925 for completion. V-1 cruised along the Atlantic coast and in the Caribbean until November 1927.
Barracuda was recommissioned at Portsmouth, New Hampshire, on 5 September 1940 and assigned to Submarine Division 9. She sailed from Portsmouth 2 March 1941 to Bermuda, returning in June to join Submarine Division 71. She remained in the New England area until sailing from New London, Connecticut, on 17 November 1941 to join the Pacific Fleet. She attended to duty in the Pacific Patrol Area until 15 December 1941 when she rejoined the Atlantic Fleet. Between 15 December 1941 and 7 September 1942 Barracuda was attached to Submarine Division 31 and completed six war patrols in the Pacific Ocean, southwest of Panama, without enemy contacts. Barracuda returned to Coco Solo, Canal Zone, on 7 September 1942 and, following voyage repairs, she proceeded to Philadelphia, Pennsylvania, for overhaul. At this time she was converted to a cargo submarine with the removal of her main engines, severely restricting her speed on the auxiliary engines. Following overhaul she was based at New London until February 1945 with Submarine Divisions 13 and 31. She operated on training problems with destroyers, other submarines, and planes in Block Island Sound. Barracuda arrived at Philadelphia Navy Yard on 16 February 1945; was decommissioned 3 March 1945; and sold 16 November 1945.