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The Flettner-rotor: "How to build an airplane without wings." [View all]
Flettner-rotors are based on the Magnus-effect: When wind flows around the cylinder, the rotation of the cylinder creates increased air-pressure on one side and lowered air-pressure on the other side. The pressure-differential pushes the cylinder in a direction vertical to the wind.
I would LOVE to know the energy-efficiency on air-travel for that one.
It has been estimated that a "sailing"-ship with Flettner-rotors has 50% less fuel-consumption than a freighter using propellers.
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