It is a really complex matter.
If you have electric power it is obvious you want the ultimate efficiency. But when sailing you want the least drag. Where in your goals lies the optimum? For everybody that is different.
Big slow props are the most efficient to transfer power.
Big slow props give the most drag.
Props are not designed to regenerate under saIL, regenerating is never efficient. Please propdesigners do some development here.
IMHO for sailboats het most gain should be possible with a Voight-Schneider drive (google if you want pictures).
In these times where it should be easy to control digitally every vane independently and you will have great powercontrol and steering, set every vane in a feather position when sailing and probably you can use all the vanes together as a rudder.
I believe it is a path worth to explore but I am too old to put in all the efforts needed.
Carel.
Van: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
Verzonden: zaterdag 20 februari 2016 04:29
Aan: electricboats@yahoogroups.com
Onderwerp: Re: [Electric Boats] Why gear reduction?
Hi John,
Welcome!
The principal reason is efficiency. Much testing data exists to support the statement "a slow-turning, large diameter prop is more efficient than the same speed achieved with a faster-turning, smaller diameter prop at the speeds reached by most sailboats". ………………
Posted by: "Carel Ruysink" <c.ruysink@hetnet.nl>
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