The Ava 4A was a low power flat-four ( boxer engine) developed for very light aircraft in

France France (), officially the French Republic ( ), is a country primarily located in Western Europe. It also comprises of Overseas France, overseas regions and territories in the Americas and the Atlantic Ocean, Atlantic, Pacific Ocean, Pac ...

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 engine A two-stroke (or two-stroke cycle) engine is a type of internal combustion engine that completes a power cycle with two strokes (up and down movements) of the piston during one power cycle, this power cycle being completed in one revolution of t ...

s. He also designed a two stroke

horizontally opposed A flat engine is a piston engine where the cylinders are located on either side of a central crankshaft. Flat engines are also known as horizontally opposed engines, however this is distinct from the less common opposed-piston engine design, wh ...

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 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 Farman Moustique is a family of French monoplanes built by the Société des Aéroplanes Henry et Maurice Farman at Billancourt. Shortly after the end of World War I, Farman introduced a low powered single seat monoplane for sport and to ...

, the F.451.

Variants

;Ava 4A-00: , as described. ;Ava 4A-02: Identical to 4A-00 except for bore and increased compression, giving continuous power. Weight .

Applications

* Carmier T.10 *

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* Druine D.30 Turbulent *

* Jodel D.98 Bébé *

Mignet HM-14 Pou du Ciel The Mignet HM.14 ''Flying Flea'' (''Pou du Ciel'' literally "Louse of the Sky" in French) is a single-seat light aircraft first flown in 1933, designed for amateur construction. It was the first of a family of aircraft collectively known as Flyi ...

SFAN II The SFAN II was a French motorglider built in the mid-1930s. Specifications See also References {{reflist 1930s French sport aircraft Single-engined tractor aircraft High-wing aircraft Aircraft first flown in 1935 ...

Starck AS90 New Look Starck is a German surname, which means a strong, bold person, from the Middle High German ''starke'', meaning "strong" or "brave".''Dictionary of American Family Names''"Stark Family History" Oxford University Press, 2013. Retrieved on 16 January ...

* Tipsy S

Survivors

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

Specifications (4A-00)

References

{{Reflist, refs= {{cite book , title= Jane's All the World's Aircraft 1938, last= Grey , first= C.G. , year=1972, publisher= David & Charles, location= London, isbn=0715 35734 4, page=40d {{cite book , title= Les avions Farman , last= Liron , first= J.L. , year= 1984, publisher= Éditions Larivère, location=Paris, pages=230 {{cite journal , date=19 November 1939, title=Les moteurs Ava, journal=Les Ailes, issue=938 , pages=16, url=http://gallica.bnf.fr/ark:/12148/bpt6k65552461/f15 {{cite web , url=http://www.bapa.aero/AVA%204A-00.htm, title=Belgian Aviation Preservation Association , access-date=21 February 2017 Two-stroke aircraft piston engines 1930s aircraft piston engines Boxer engines