The Aeronca E-113 was a small, flat-twin piston engine developed for Aeronca’s range of light aircraft. It was an overhead-valve improvement on the earlier flathead E-107 design. Originally built with a single ignition system, the E-113 was later upgraded to dual ignition in response to FAA regulations introduced in 1939. By then, both the engine and the aircraft it powered were becoming outdated, though roughly 1,800 units were produced in total. A licensed version, the Aeronca-JAP J-99, was pr