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The Chasle YC-12 ''Tourbillon'' ("Whirlwind") was a single-seat light sporting aircraft developed in France in the mid-1960s and marketed for homebuilding via plans. It was a low-wing cantilever monoplane of conventional configuration. As designed, it featured fixed 
tailwheel undercarriage
Conventional landing gear, or tailwheel-type landing gear, is an aircraft
An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynami ...
, but it could also be fitted with fixed tricycle gear.
The Tourbillon flew for the first time on 9 October 1965. Though fifteen sets of plans were sold, only two other Tourbillons were built, both in the UK. The prototype remains on the French Civil register but the two UK aircraft are now deregistered. Their engine types are not recorded in the registration documents.
Variants
;YC-12 :prototype with Continental A65 engine ;YC-121 :similar to prototype with enlarged tailfin for limited certification ;YC-122 :similar to YC-121 but with Continental C90 engine ;YC-123 :similar to YC-121 but with Potez 4E-20b engineSpecifications (typical YC-121)
References
Further reading
* * {{Chasle aircraft 1960s French sport aircraft Homebuilt aircraft Low-wing aircraft Single-engined tractor aircraft Tourbillon Aircraft first flown in 1965