In message <b3d84320010210047dad@[194.72.197.52]>, hugh piggott
<hugh.piggott@...> writes
>The blade noise can be pretty loud, but the alternator makes a fair old
>droning noise too, whic dominates at lower windspeeds. This is due to the
>unequal balance of the phases. This imbalance is a special feature, unique
>to the AIR, which improves the shape of the power/speed curve of the
>alternator.

Yes, I've heard that noise as well. When I had a 303 attached to my
house, the house itself acted as an amplifier and the droning noise was
everywhere.

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Regards, Graham Chiu