Subject: Re: [harryproa] Vector diagrams to ascertain centre of lee way resistence
From: "Rob Denney" <>
Date: 4/27/2008, 9:42 AM


I don't have anything, but basically it is the drive force from the
sails and the drag from each hull and the rudders. Hulls can be
calculated with Michelet if required.

The drag on the windward hull is less than on the leeward one as it
has lower wetted surface which gets even lower as the breeze

Be great if Terho would put some numbers on this for us.



On Sun, Apr 27, 2008 at 3:37 PM, Robert <> wrote:
> Rob,
> Have you got a set of vector diagram suitable for posting as to the
> various forces on the boats so as to find the subsequent center of lee
> way resistance for various points of sail. It may be useful for
> explaining why the boats can get away with the fatter heavier hull to
> ww. This seems the sticking point for quite a few. Maybe Terho might
> have something.
> Robert

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