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First flown in 1931, the Loening XSL was a lightweight flying-boat designed to be folded up and stored in an 8-foot-diameter watertight tube on the deck of a submarine. It was a single-seat, mid-wing monoplane powered by a 110 hp (82 kW) Warner Scarab radial engine mounted above the wing driving a pusher propeller. Originally designated the XSL-1 by the Navy, it was re-designated XSL-2 in 1932 when it was re-engined with a 160 hp (119 kW) Menasco B-6 engine. Only the prototype was built; it was not ordered into production.
^ "Loening". www.aerofiles.com. 3 November 2008. Retrieved 23 October 2011.
Bibliography
Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN0-904597-22-9.
Passingham, Malcolm (February 2000). "Les hydravions embarqués sur sous-marins" [Submarine-carried Seaplanes]. Avions: Toute l'aéronautique et son histoire (in French) (83): 7–17. ISSN1243-8650.