Word: savonius
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...with the forward movement, produces low pressure on top of the rotor, increased pressure (lift) on the bottom. If the motor should quit the rotor continues to spin in descent, the lift force stretching the plane's course into a long glide. Unconsciously Designer Hatlestad had employed the Savonius windmill principle.* His scheme is not to be confused with the Flettner rotor or recently publicized paddle-wing rotorplanes, both of which involve power-driven rotors...
...ordinary windmill will turn only when facing the wind. The late Capt. F. J. Savonius (died 1931) of Finland invented a mill with S-shaped arms which could catch wind from any direction...
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