Why not just Google something like:
water driven generator

"marklan" wrote in message
news:jFxRc.251531$JR4.136293@attbi_s54...
Water driven prop-not wind -wind is and has been around for yrs.
"AC" wrote in message
...
If you mean generation via an existing normally powered prop, then I would
say this is very unlikely. The friction losses (aside from the inefficient
prop) would be too great in a system designed to be engine driven.

A wind gen would generate far more efficiently.

"marklan" wrote in message
news:fEoRc.266822$Oq2.12859@attbi_s52...
I hear the there is a company that makes one and it generates when you
are
under sail.Has any one heard of this?