The rotor proved uneconomical to operate, so the design was abandoned. It was proposed for use in an aircraft, and has seen something of a revival in the last decade.
For a comprehensive set of articles, visit Anton Flettner.
Anyway, plans for a model below, taken from an old Popular Mechanics or Popular Science encyclopedia.
The model plans look nice, but the model is not a true representation of the Flettner rotor. The model is a Savonius rotor driving a propeller, but the Flettner rotor does not connect with a propeller.
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