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Main patent Edit
https://www.google.com/patents/US6692230 Balanced, high output, rapid rotation wind turbine (Weathervane multi-rotor windmill) Multiple horizontal axis rotors are coaxially attached, at spaced intervals, to an elongate driveshaft, which is aimed at a slightly offset angle from the wind direction, exposing each rotor to fresh wind. That offset angle may be in the vertical plane, horizontal plane, or oblique. The shaft is held by bearings near its midsection, and drives a load, such as an electrical generator. This assembly is allowed to pivot about the vertical axis of a supporting tower, and may be actively or passively aimed, in response to wind direction and velocity. Multiple driveshafts may be mounted on a single pivoting support frame. Multiple small rotors weigh less for the same swept area than an equivalent larger rotor, are easier to manufacture and transport, and rotate faster, transmitting the same power at less torque, more closely matching the required rpm of a generator, reducing or eliminating the need for ratio gearing.