The SS El Capitan was a cargo steamship constructed in 1917 by Newport News Shipbuilding and Drydock Company in Newport News, Virginia. Designed with a single screw propulsion system, she featured three steel decks arranged on a transverse framing system, with watertight bulkheads extending to key compartments for enhanced safety. Her design included forepeak, between #1 and #2 holds, aft of the engine room, and an aft peak bulkhead, with additional bulkheads extending to the lower deck. The vessel was powered by a triple-expansion steam engine, with cylinders measuring 24.25, 41.5, and 72 inches in diameter, driven by two oil-fired Scotch marine boilers. This setup allowed her to reach a speed of approximately 11 knots when fully loaded, optimized for her cargo capacity of 6,500 tons, reflecting her purpose as a slow-moving freight carrier. Launched around August 1917, the ship was requisitioned before delivery by the U.S. Shipping Board during World War I, and commissioned as USS El Capitan (ID-1407) in March 1918. During her naval service, she operated under the Naval Overseas Transportation Service, completing four transatlantic voyages carrying supplies to France and England. Notably, she engaged a German submarine during her second voyage, forcing it to dive with her gunfire. She was decommissioned in early 1919 and returned to commercial service with the Southern Pacific Company. In the years leading up to World War II, the vessel was acquired by the War Shipping Administration and transferred to the United States Lines, with her registry changed to Panama. During her WWII service, El Capitan participated in the Arctic convoy PQ 17. She was damaged by air attack on July 9, 1942, suffering hull breaches and engine room flooding, leading to her abandonment. She was subsequently torpedoed and sunk by U-251 in the early hours of July 10, 1942. Her service history underscores her maritime significance as a wartime cargo vessel involved in critical transatlantic and Arctic operations.

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