Rotation in free fall of rectangular wings of elongated shape

Dupleich, Paul.

The tumbling motion of the flat plate in a free fall in air and water has been investigated with variable aspect ratio, span chord, and loading. A theory is presented which explains the sustension of the steady motion on the basis of the aerodynamic moments acting; and also empirical relationships are given, as functions of the design variables, which define the steady motion for any given flat plate. The motion of paddle wheels, prisms, the circular cylinder, isosceles trapezoids, and graphite flakes are also discussed briefly.

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