Abstract: A machine for economical recovery of wind power employs a self-adjusting mass-balanced aerodynamic blade weathervaning freely around a lengthwise pitching axis forward of its aerodynamic center, and an aerodynamic roller in its leading edge, spun at high RPM by a motor. The roller controls aerodynamic performance to high levels of efficiency at high lift coefficients, employing novel roller/airfoil profiles. For ship propulsion, the self-adjusting blade with roller stopped is like a furled sail, and with the blade held angling to the wind with roller spinning is like a large, efficient, easily controlled sail. On a horizontal axis wind turbine, the self-adjusting blade is continuously held to an efficient angle of attack by centrifugal lift-increasing pitching moments balancing aerodynamic lift-decreasing pitching moments. The blade whirls steadily despite fluctuations of wind speed and direction, reducing stresses, and preventing structural damage or loss of efficiency.

Abstract: A kite for continuous and reliable flight without configuration change in winds ranging from light breezes to the strongest natural winds consists of a wind formed lifting surface in tension stabilized by a long thin trailing filament, such as a thin weighted cord or a thin metallic wire, the motions of which are damped by a minimum number of free-trailing flexible streamers.

Abstract: A keel kite is disclosed having an increased range of flight speeds and an improved ability to withstand gusty winds, consisting of a mass-balanced sail portion eliminating the center line spar either entirely or over the rear central portion of the sail, and a separately mass-balanced keel portion supported by a spar along its lower edge, aerodynamically balanced, able to pivot somewhat in yaw, and employing an adjustable trimming surface.