Subject: [harryproa] Re: New file uploaded to harryproa
From: "tsstproa" <bitme1234@yahoo.com>
Date: 5/17/2008, 12:39 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

--- In harryproa@yahoogroups.com.au, "Robert" <cateran1949@...>
wrote:
Part of the beauty of the Harry concept, is that as the wind
> increases, the relative drag from the ww hull decreases, at the
same
> time as the leeway resistance from the bow increases. TO some
extent,
> these changes in forces balance. To get leeway resistance, there
needs
> to be some atack from the foils, or there is no lift. It is a
balance
> between angle of attack and size of the foil. The bows themselves
need
> some angle of attack for leeway resistance, and having the rudders
run
> parallel with the bows would seem to come close to optimal, but a
> slightly larger angle of attack with a smaller rudder may have
> slightly less drag. It may be that a slight lift on a shallow
forward
> rudder could reduce the overall drag as it is likely to be more
> efficient in terms of lift to drag than a bow.

Have a look at this test same day with traditional pacific proa and
triangle sail. One run with weight on leeward hull and the other
with just board down two ways of off setting lateral hull area.
http://www.youtube.com/watch?v=XW9-IGRz78o

Todd

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