Here's my summary of the discussion over the last few years.
http://sites.
-Keith
--- In electricboats@
>
> this discussion sounds to me that regeneration has been discussed and even tried but seems to have been less successful than everyone would like. by this i mean pure regeneration not just matching the prop to sailing speed.
> what happened and what are the reasons for not being successful.
> how much drag for regeneration would be acceptable?
> how much power needs to be supplied by the propeller to the motor to have regeneration?
> what propeller rpm and torque would start and maintain regeneration.
> How much power should be regenerated with time.
> what usage? house batteries and power batteries of both etc.
>
>
> --- In electricboats@
> >
> > I believe, but can't yet prove, that the one area where "regeneration" might actually be practical is in what Kevin P calls "electrosailing" - matching the prop rotation to the boat speed so that it's regenerating about 50% of the time (very low wattage mind you) The point of this is not really regen, but rather nullifying the prop drag and getting the extra 1/2 to 3/4 knot of speed. Over a sufficient distance, this extra speed is the practical equivalent of a feathering prop (without the drawbacks) and nearly net zero energy use.
> >
> > I currently have a 3-blade, so the above is more necessity than choice.
> >
> > -K
> >
> > --- In electricboats@
> > > I bet a large diameter, high aspect ratio 2 blade prop would give excellent performance as a sail aux drive, especially if a method could be devised to lock the prop in the vertical position hiding in the wake of the skeg. A folding prop that would work in reverse would be even better.
> > >
> > > Denny Wolfe
> > > www.wolfEboats.
> > >
> >
>
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