Evolution driven by months of tinkering saw the device grow from having one aerofoil to two to eventually three. Each aerofoil was allowed to pivot freely. Each aerofoil was fitted with a tail. The tails were controlled by cams fixed to the rotating arms. Eventually a workable device was achieved with a power coefficient of around 15%, very high starting torque and slow rotational speed.
Pros: high torque, quiet, safe
Cons: Electrical generators not easily matched to slow rotational speed, power coefficient lower than most HAWT's (horizontal axis wind turbines)
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