Ava 4A

Ava 4A
Type	Flat-four, air-cooled two-stroke
National origin	France
Manufacturer	Ava
Designed by	Marcel Violet

The Ava 4A was a low power flat-four (boxer engine) developed for very light aircraft in France in the 1930s. It was used by several prototypes and at least one production series.

Marcel Violet was a French racing driver who designed his own two-cylinder, two-stroke engines. He also designed a two stroke horizontally opposed flat-four, which was built under licence at L'agence general moteurs "Ava" by Jean Aubry of the Société J. Thibault, G Aubry et Cie, alloy metal specialists, as the Ava 4A. It only produced 19 kW (25 hp) and was intended to power small, low cost, single seat aircraft, replacing the aging Anzanis and completing with the French Mengin Type B and the older British Bristol Cherub engines.

The Ava 4A was on display at the November 1936 Paris Salon. It powered several prototypes and also the forty-six examples of the series production variant of the Farman Moustique, the F.451.

A 4A-00 survives in a private collection and is sometimes exhibited on loan.

Data from Jane's All the World's Aircraft 1938, p.40d

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