The mast on a harry is in the lw hull. When pressed that hull goes deeper and there is some angle of heel. Both factors reduce the heeling moment by reducing effective sail area presented to the wind and the length of the moment arm.
A cat with the mast in the middle has one hull going deeper and the other rising. The base of the mast will rise if the ww hull lifts and that will more than offset the loss of projected area due to heeling until the hypotenuse of the triangle of the rig height and half beam is vertical. A cat with a sail in each hull has one sail rising rapidly and they other similar to the harry.
On 7 Jun 2018, at 7:37 pm, Björn bjornmail@gmail.com [harryproa] <harryproa@yahoogroups.com.au> wrote:Why does the heeling moment reduce on the harryproa, but increase on the cat?
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Posted by: Rick Willoughby <rickwill@bigpond.net.au>
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