----- Original Message -----From: ToddSent: Saturday, March 17, 2007 3:45 AMSubject: [harryproa] Re: Aerodynamics and sailing performanceSo what has a more efficient leading edge the foresail on a wire or
the mainsal on a thick wing mast?
I have a rig that would seem to fit a harry style proa the way most
accomadation and sailing are done from the windward hull. If the rig
could be built as light as the rig used now.
Double A frame is also a lifting rig and could be used with solid
wing sail or soft sails. Only thing it would have to have some
standing rigging.
Have a look in the photos double A frame.
--- In harryproa@yahoogroups.com.au , "brag_rotor" <brag_rotor@...>
wrote:
>
> Hello Todd,
>
> Yes, a successful ustayed mast solution is great news - the loss
> of the stays can deliver a disproportionally large reduction in
drag,
> but other items then assume greater importance. Remove one
problem to
> reveal the next, as always.
>
> The 'wire vs foil' illustration is well established; we did do
stuff
> at the CAAE in small, crude wind tunnels, but one can play around
with
> models in a breeze - the effect is that obvious.
>
> Yes, chord and span play their part - the point is that for the
given
> sections, the illustration is valid. Everything scales pretty
well,
> if you allow for reynolds Number.
>
> Not sure I followed your last point about the sails?
>
> Arguably one of the greatest airfoil designers of the present day
was
> (I think) trained as a musician - John Roncz. His results speak
for
> themselves.
>
> An ounce of experiment is worth a pound of theory in my book.
>
> All the best, Ben
>
>
>
> --- In harryproa@yahoogroups.com.au , "Todd" <snyder2016@> wrote:
> >
> > I like the idea of an unstayed mast especially on a boat that
> > doesn't need to have gobs of sail area to attain good overall
speed.
> >
> > Don't really agree with you on the wire vs foil thingy, may be
just
> > my misunderstanding. I don't have a formal education in
> > aerodynamics. But doesn't frontal area and cord width play a
part in
> > your apple vs an orange theory ;) I wonder what the out come
would
> > be with the same size sail for given length masts attach to each
> > would be?
> >
> >
> > Rob,
> >
> > If the whole principal behind your designs are minimal material
and
> > hardware then why such the high price tag $$$$$ on used boats ?
> >
> > Todd
> >
> > <znip>
>
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