Rick, now I see where your headed I think. Dagger board placed in Leeward hull. So at low speeds you will have your leeway prevention allowing rudders to be more effective. So this in turn allows smaller steering blades to be used. On profile groups Laruant has done just that I think. I razzzzed him about three boards vs two. I'm not sure how much he has experiment with the sizing of his steering boards though.
This would be a great model test. First determine length and size of Dagger Board then starting with old steering boards of original proa design progress to smaller sizes and see what happens.
Hvae a look at this page Under Munroe
http://thecheappages.com/proa/commodore.html#Excerpt
http://thecheappages.com/proa/commodore.html#1900
He had similar ideas using through hull dagger boards.
It would seem were headed back to the age old debate shallow draft long boards deep draft small if any boards exposed.
Seaworthiness The forgotten Factor Revised edition C A Marchaj. Had to get the book back out.
Todd
--- In harryproa@yahoogroups.com.au, Rick Willoughby <rickwill@...> wrote:
>
> Todd
> No, that is not my goal. My preferred proposal until I see something
> better is to resist leeway with a centreboard mounted in the lw hull.
>
> Using the slab side of a hard chine hull to resist leeway is as
> effective as using ventilating rudders. Although the rudders are
> still needed because the CLR will shift about as the hull pitches in
> waves and sail loads.
>
> Rick