Plain English Meaning
A wing cross-section shape with a flat bottom and a curved top. It is a classic, simple wing profile that flies well and is easy to build.
Full Definition
A specific airfoil shape with a flat lower surface from about 30 percent of the chord back to the trailing edge, and a curved (cambered) upper surface. Designed in 1922 by Virginius E. Clark, it produces good lift with relatively low drag and is easy to manufacture because of its flat bottom. It has been widely used on general aviation, training, and historic aircraft.
Context Anchor
Seen in airfoil design diagrams that compare different wing shapes and how they affect .