First flown in 1931 the Loening SL was lightweight flying-boat designed to be folded up and stored on a submarine within an 8-foot space.[2] 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.[2] 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.[2] Only the prototype was built and it was not ordered into production.[1]
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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.