Build them asymm. 6% camber on leeward side and 12% on windward side or any variation the thinkers can come up with, max camber thickness center chord then link steering blades to counter rotate. No daggers needed ever, going to windward in displacment mode made easy, going to windward at high apparent wind even easier. Keep original width and make 1.5 meter long. Never have to worry about getting caught aback or losing directional stability at any speed. Sail as closed to the wind as you want without losing positive feel in helm.
Then I'd really start to get excited.
Did I read something of invite for an afternoon sail was that an open invite?
Todd
--- In harryproa@yahoogroups.com.au, arttuheinonen@... wrote:
>
> Hi,
>
> They were 1.3m , then I cut them to 1m. Now thinking to build new blades, longer and a bit thinner, maybe 0010 NACA. A friend has molds for it.
> I rotate them 180 degrees at each shunt. It is same amount of turns as on original desing. I do not recall how many, was it three turns??
> The shape of the blades must be perfect. I´m not so sure about the ones I have got now.
>
> Regards,
>
> Arttu
>
>
>
>
> bjarthur123 [bjarthur123@...] kirjoitti:
> > 5-10 degrees is awful big per rick's post. have you thought of enlarging them?
> >
> > ben
> >
> >
> >
> > --- In harryproa@yahoogroups.com.au, arttuheinonen@ wrote:
> > > How are rudders on RB when sailing? Do you have steer down on the rear rudder all time time and how much?? What is typical rudder angle? On Ono it is fwd 0 degrees, rear 5-10 degrees, when sailing straight forward.
> >
> >
> > --- In harryproa@yahoogroups.com.au, Rick Willoughby <rickwill@> wrote:
> > > I am not sure where it was mentioned but someone made the comment
> > > that they had operating rudder angles of 10 degrees. If they are
> > > NACA0012 sections then they will ventilate at this angle at higher
> > > speed or have a deep wave trough on the lifting side at slower speed
> > > - neither case is good for performance.
> >
> >
> >
> >
>