Subject: [harryproa] Re: Aerodynamics and sailing performance
From: "brag_rotor" <>
Date: 3/9/2007, 10:14 PM

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

An ounce of experiment is worth a pound of theory in my book.

All the best, Ben

--- In, "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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