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From: cirejay (no email)
Date: Fri Oct 29 2004 - 07:37:27 EDT
--- In , "squidsrus85"
<squidsrus85 at y dot dot dot > wrote:
> --- In , "jbrrr510" <jb510_yg at h dot dot dot >
> wrote:
>
> Hi JB,
>
> > While I'm not even a novice yet, let alone an expert I read a
great
> > article on prop shaft alternators yesterday that would
contradict
> > your belief that getting regen out of a spinning prop shaft is
> > practical.
>
> That is not regenerating, that is trickle charging. Think about
the
> numbers here.
>
> An alternator needs to be turning at around 900rpm to generate any
> useful power at around 40% efficiency. Using the 1:5 overdrive
> (ignoring the huge overdrive efficiency losses) suggested in the
> article, the prop shaft has to be turning at 180rpm which may well
be
> possible, I do NOT know. BUT at that speed the current from the
> alternator would be in the 5A range I am guessing and while that
is
> much better than nothing it is not regen.
>
> Dave
I'm new to this group but not not new to the issue at hand. I will
gladly take 120 Amps a day - call them trickle if you like - while
sailing across the pond. This, afterall, is a world cruising group
not a day sailng group (nothing against day sailing, or day dreaming
for that matter) is it not?
eric
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