So your goal is to resist leeway using a square or some what square flat bottom hull!?

I have seen felt and experienced something similar with this 16'L narrow square bottom hull 12'' wide at keel and sheer 24'' deep on 10'' draft, windward demon, crazy!

The video is in the bay. But I did take it out in open ocean just no video. Crazy windward ability with descent speed for what it was. Only needed oar or board down for off the wind work other wise hull only no boards down or oar used above a beam reach.

I lost some of the footage this is what I had left.
http://www.youtube.com/user/tsstproa#p/u/47/Hep6jzWf_Zc

JT my other alias there you go...

Todd


--- In harryproa@yahoogroups.com.au, Rick Willoughby <rickwill@...> wrote:
>
> Rudolf
> There is performance merit in resisting leeway with a non-
> ventillating foil or foils. Once this is achieved it does not matter
> much how the boat is steered unless the rig is poorly balanced. I am
> now thinking dipping rudders a little more sophisticated than what
> Tarawa is using would be my starting point.
>
> The other conclusion is that a slab sided or very deep V (> 45
> degrees) hull will be as effective at resisting leeway as ventilating
> rudders. So a reasonably elegant solution is exactly what Tarawa has
> in concept. It could be engineered with a bit more precision.
>
> Rick
> On 16/05/2011, at 11:16 PM, Rudolf vd Brug wrote:
>
> > 
> >
> >
> >
> > Arto,
> >
> > That's exactly what I was wondering:
> > to keep thing as simple as possible could a keel with two small
> > retractable rudders work well?
> > And I mean a keel put onto the same hull you would use having
> > boards, not a deep hull like Tarawa as that would have more wetted
> > area.
> >
> > Can you say anything about that Rick?
> >
> > Rudolf
> > ----- Original Message -----
> > From: Arto Hakkarainen
> > To: harryproa@yahoogroups.com.au
> > Sent: Monday, May 16, 2011 2:04 PM
> > Subject: Re: [harryproa] Re: Design your proa
> >
> >
> >
> >
> > 3) A comment, not a question: what you have said here seems to make
> > sense to the traditional proa lee hull design with almost flat
> > leeside and curved windward side like this Gary Dierking's Tarawa
> > design: http://homepages.paradise.net.nz/garyd/tarawa.html .When
> > working with no foils it must have been the most effective
> > hull form.
> >
> >
> > Arto 0419 104 821
> >
> >
> >
> >
> >
>
> Rick Willoughby
> rickwill@...
> 03 9796 2415
> 0419 104 821
>