THE FLETTNER VENTILATOR Mr. Anton Flettner is well known for his system of rotors used in place of sails on ships, an adaptation of which to form the lifting surfaces of aircraft has been investigated. His dynamical servo‐rudders are also familiar, both in marine and aircraft practice.
(1932), "Recent Technical Developments: A Ventilator for Cabin Aircraft—A Light Aeroplane Radio Set—Strip Production in Sweden", Aircraft Engineering and Aerospace Technology, Vol. 4 No. 2, pp. 55-55. https://doi.org/10.1108/eb029515
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