Ava 4A

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.

Design and development
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 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.

Variants

 * Ava 4A-00: 25 hp, as described.
 * Ava 4A-02: Identical to 4A-00 except for 80 mm bore and increased compression, giving 35 hp continuous power. Weight 38 kg.

Applications

 * Carmier T.10
 * Dart Pup
 * Dart Kitten
 * Druine D.30 Turbulent
 * Farman Moustique
 * Jodel D.98 Bébé
 * Mignet HM-14 Pou du Ciel
 * SFAN II
 * Starck AS90 New Look
 * Tipsy S

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