Don't most modern wind generators have "overload protection"....or at least a clampthingy to stop the prop from turning?
BTW, my debit card has an automatic "overload protection" feature, too.
i remember Rob McF at a SHTP forum saying that his wind generator was pretty much useless while going to Hawaii because there was never enough wind velocity over the boat to make it worthwhile. In the anchorage, though, it's great. I recently read a compendium of wisdom-bytes from some puddle-jumpers who wrote the same thing.
1968 Selmer Series 9 B-flat and A clarinets
1962 Buesher "Aristocrat" tenor saxophone
Piper One Design 24, Hull #35; "Alpha"