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Aegean aerodynamic aerofoil blades aeroplane airscrew angle of attack Anton Flettner application bearings Beaufort Beaufort scale boundary layer brake built Crete cup anemometer curve developed devices diameter direction disk downstream drive dynamo electrical engine experience experimental fatigue Flettner flow fluid flywheel force friction high-speed aerofoil horizontal increase laboratory lift and drag lift force load low speed Magnus effect mast material maximum measurement mechanical method motion mounted Netherlands Osborne Reynolds output overspeed pitch angle power available pressure problem produced propeller pumping ratio relative rigged rope rotational speed rotor sail arms sail mill Savonius scale sheet ship small windmill starting torque steady streamlines structure symmetrical aerofoil tail vane timber tion tip speed ratio tip-speed torque tower traditional mill two-bladed velocity vertical axis viscosity watts weight wheel Whilst wind energy wind power wind speed windpower Windseeking windshaft windwheel yacht