Just to add to this interesting discussion,  746watts  equals 1 Horse power.    So lets say 20 amps  x 14.2v   = 284  Watts    double it for losses.  568 Watts.  Now  568/746  = 0.76 Hp.  A lot less than has been suggested  and still  free power.

Regards  Deb



________________________________
From: Dave_Benjamin <dave_benjamin@...>
To: amelyachtowners@...
Sent: Wednesday, 20 July 2011, 0:13
Subject: [Amel] Re: Maramu prop shaft alternator


 
I'm a bit confused about the comparison in losses between the PSA and a wind generator. Water is far denser than air. The prop becomes a speed brake of sort. I'm not a physicist but I'd wager that amp for amp the performance loss with a wind generator is negligible compared to a PSA.




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