|Subject: Re: [harryproa] Re: Aerodynamics and sailing performance|
|From: "Rob Denney" <email@example.com>|
|Date: 3/17/2007, 5:24 AM|
----- Original Message -----From: ToddSent: Saturday, March 17, 2007 3:45 AMSubject: [harryproa] Re: Aerodynamics and sailing performance
So 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
Have a look in the photos double A frame.
--- In harryproa@yahoogrou
ps.com.au, "brag_rotor" <brag_rotor@ ...>
> Hello Todd,
> Yes, a successful ustayed mast solution is great news - the loss
> of the stays can deliver a disproportionally large reduction in
> but other items then assume greater importance. Remove one
> reveal the next, as always.
> The 'wire vs foil' illustration is well established; we did do
> at the CAAE in small, crude wind tunnels, but one can play around
> models in a breeze - the effect is that obvious.
> Yes, chord and span play their part - the point is that for the
> sections, the illustration is valid. Everything scales pretty
> 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
> (I think) trained as a musician - John Roncz. His results speak
> An ounce of experiment is worth a pound of theory in my book.
> All the best, Ben
> --- In harryproa@yahoogrou
ps.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
> > Don't really agree with you on the wire vs foil thingy, may be
> > my misunderstanding. I don't have a formal education in
> > aerodynamics. But doesn't frontal area and cord width play a
> > your apple vs an orange theory ;) I wonder what the out come
> > 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
> > hardware then why such the high price tag $$$$$ on used boats ?
> > Todd
> > <znip>
Internal Virus Database is out-of-date.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus Database: 268.18.6/709 - Release Date: 3/3/2007