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From Wikipedia, the free encyclopedia

An Aeronca-JAP J-99 (licensed E-113) on display at the Shuttleworth Collection.
Type Flat-twin aircraft engine
Manufacturer Aeronca
JA Prestwich
First run 1936
Number built 1,800
Developed from Aeronca E-107

The E-113 was a small flat-twin piston engine developed by Aeronca for use in some of their light aircraft. It was an overhead valve development of the flathead configuration 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,[1] differing from the E-113 by being fitted with dual ignition.
Engines fitted to impressed aircraft were given the designation O-113.




Engines on display

Specifications (E-113)

General characteristics


  • Cooling system: Air-cooled


See also

Comparable engines

Related lists



  1. ^ Lumsden 2003, p.160.


  • 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)
This page was last edited on 14 December 2019, at 19:56
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