During the 1970s and early 1980s several manufacturers built wind machines with rotors downwind of the tower. Detail of Darrieus rotor with nomenclature. Giromill or cycloturbine. Multiblade farm windmill. A hybrid device that uses the lift created by a spinning cylinder demonstrates the Magnus effect.
Airfoil performance is gauged by the ratio of lift to drag.
Taper and twist. Blade cross section. Drive train for typical medium-sized wind turbine. Techniques for generating utility-compatible electricity. Halladay rosette or umbrella mill.