The Chasle YC-100 Hirondelle (English: Swallow) is a French single seat microlight designed in the 1980s.
Yves Chasle worked as an Aérospatiale stress engineer and independently designed several light aircraft, starting with the Chasle YC-12 Tourbillon. His YC-100 Hirondelle is a largely wooden framed and fabric covered single-seat sports aircraft of conventional pusher layout. It has a strut braced high wing of constant chord with styrofoam ribs. The fuselage of the Hirondelle is a slender, rectangular cross-sectioned beam with the pilot's seat upon it ahead of the wing leading edge. Behind the pilot a central structure supports the wing just above head level; on its trailing edge, one of several types of small piston engine, with power outputs typically around 20abbr=onNaNabbr=on, drives a pusher propeller. The fin is broad and straight-tapered and the horizontal tail is attached to the fuselage underside. The Hirondelle has a short, fixed tricycle undercarriage.
Its first flight was on 1 May 1985, powered by a 18abbr=onNaNabbr=on König SC 430 engine, a 430 cc (26.2 cu in), air-cooled, three-cylinder radial. The second prototype, built in Brazil, had a 22hp JPX PUL 425/503 engine, a 212 cc (12.9 cu in) air-cooled flat-twin two stroke.
The number built is uncertain; in 2009 two examples, both YC-100s, appeared on European civil registers, one in Spain and one in France.
Plans for these were available but only the YC-100 is known to have been built.
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