Clark-Y
Clark-Y is the name of a particular
aerofoil profile, widely used in general purpose
aircraft designs, and much studied in
aerodynamics over the years. The profile originated in the
1920s, largely from empirical work. For many applications, the Clark-Y has never been bettered, it gives good overall performance in respect of its
Lift-to-drag ratio, and has gentle and relatively benign
stall characteristics.
The Douglas DC-3 is one example of the Clark-Y in practice.