On Sun, 07 Jun 2009 12:15:02 +0700, Bruce in Bangkok
wrote:

He also reckoned that it didn't make as much electricity as
the wind generator during a voyage as often you are traveling slower
then the wind is blowing.

That makes no sense whatever. In both cases power is rotor area times
speed squared. You can make either rotor whatever size, and either
speed can be whatever.

Casady