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.

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, 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 was first recognised in 1939.^[1][2]

E-113A

Standard production model delivering 36-45 hp (26.85 - 33.56 kW)

E-113C

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,^[3] differing from the E-113 by being fitted with dual ignition.

O-113

Engines fitted to impressed aircraft were given the designation O-113.

• An Aeronca E-113 is on public display at the Aerospace Museum of California

Comparable engines

• ABC Scorpion
• Armstrong Siddeley Ounce
• Praga B2
• Walter Atom
• Welch O-2

Related lists

• List of aircraft engines