Tumblewing

Tumble wings are frequently employed in wind turbines (such as the Savonius design), and are also used in some types of confetti.

Tumble wings may be made of any material that supports some stiffness for form, such as paper, plastic, metal, composites or wood.

Many leaves falling from trees become tumble wing gliders.

Tumbling wings generate lift by alternately flying and stalling as the angle of incidence changes with the spinning motion (see magnus effect and flettner rotor).

Its mode of flight is more akin to confetti than traditional fixed-wing aircraft; however, several model aircraft, such as flettner airplanes, have been built with tumbling wings for lift.