Although I only have physics training, not engineering, I would say that
this is a non-practical setup. Your motor is driven (probably) by a large
torque, low-revving motor. The output [and drivetrain] is designed to handle
this, and the small input you will get from the water/hull is negligible.

Working in reverse, you will encounter many probs, not the least of which,
is the prop is being worked counter to its normal operation. Friction of
normally slow-moving bearings would be the major one, I suspect.



"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?