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Which way to turn?

Letters

Can anyone please explain why the rotors of wind turbines are always designed to rotate on a horizontal axis?

Three or four rotor arms with hollow hemispheres rotating in the horizontal plane on a vertical axis would surely make better use of whatever wind is available, turn more rapidly, be independent of wind direction, present less risk to birds and be more acceptable visually and probably acoustically.

It might even be possible to mount two rotors on one pylon driving two generators through a concentric axle and sleeve which should appeal to environmentalists.

Hugh Burn (F), 15 Greenfield Road, Devizes, SN10 5BP

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