Richard Casady wrote:

The ones that put out a megawatt or more don't make all that much
noise and are not particularly obnoxious. Low RPM, they make kind of a
swishing sound. Too bad they weigh fifty tons and up. We have 600 of
the big ones here in Iowa, and as far as I know, none of the little
ones you object to. I have seen pix of the ones you refer to.

Did you post this for any reason other than to post? The fact is that
the wind gennies used on sailboats are noisy and also dangerous. While
rare, if one of them comes down, it'll kill you if it hits you. It'll
tear the squat out of your boat too.