|An Aeronca-JAP J-99 (licensed E-113) on display at the Shuttleworth Collection.|
|Type||Flat-twin aircraft engine|
|Developed from||Aeronca 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. Following an incident in October 2015 where the propeller detached from an Aeronca C3 in 2015, the Light Aircraft Association has issued an advisory that all aircraft fitted with these engines have the crankshaft attachment inspected prior to flying again. This issue has been recognised since 1939.
- 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.
- Aeronca 100
- Aeronca 300
- Britten-Norman BN-1
- Currie Wot
- Dart Kitten
- Hants and Sussex Aviation Herald
- Heath Parasol
- Hillson Praga
- Luton Minor
- Peterborough Ely
- Slingsby Motor Tutor
- Taylor J.T.1
- Tipsy Junior
- 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
- Power output: 36-40 hp (26.9-29.8 kW) at 2,400-2520 rpm
- Compression ratio: 5.1:1
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- Lumsden 2003, p.160.