The E-113 was a small flat-twin piston engine developed by Aeronca for use in some of their light aircraft. It was a development of the E-107.
 Design and development
Originally fitted with a single ignition system, this was uprated to dual ignition when changes in FAA regulations made this mandatory in 1939. By that time, however, both the engine and the aircraft that it powered were facing obsolescence. Altogether, some 1,800 examples were built.
- Standard production model delivering 36-45 hp (26.85 - 33.56 kW)
- Uprated engine delivering 40-45 hp (29.83 - 33.56 kW)
- Aeronca-JAP J-99
- The E-113-C was license built in England as the Aeronca-JAP J-99 by J A Prestwich Limited (JAP) and powered several British aircraft types, differing from the E-113 by being fitted with dual ignition.
- Engines fitted to impressed aircraft were given the designation O-113.
 Specifications (E-113)
- Type: 2-cylinder air-cooled horizontally opposed aircraft piston engine
- Bore: 4.25 in (107.95 mm)
- Stroke: 4 in (101.6 mm)
- Displacement: 113.49 in³ (1.86 L)
- Dry weight: 118 lb (54 kg)
- Cooling system: Air-cooled
 See also
- Comparable engines
- Related lists
- Lumsden, Alec. British Piston Engines and their Aircraft. Marlborough, Wiltshire: Airlife Publishing, 2003. ISBN 1-85310-294-6.
- Trainor, Todd. Aeronca K and Aeronca Engines website
- 1938 Aeronca engine manual (online copy available here)