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From: pete judd (no email)
Date: Fri Oct 29 2004 - 21:29:42 EDT
Steve and Linda Dashew have talked about shaft
altenators in thier world crusing book, as well as
adding a second shaft with prop just to use as a
sailing DC power sorce. My Transmission, and many
others must be locked in place while sailing, because
the lube comes from the engine end of the
transmission.
Pete
S/V Murphy's Lawyer
--- cirejay <> wrote:
>
>
> --- 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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