Arto. Words get tricky to me. I know What I'm tring to accomplish and know the feel i'm searching for. Sounds hokey I know. Thanks for bearing with me though.
As far a sheet angle and wind wangle look at this clip . wind is coming from about upper left had corner. Look at both trailing edges of each sail. Look at the leading edge of dyna rig. Watch as each boat gathers speed and there reaction to puffs. Look at the finishing angle as both as they approach the beach at end of clip.
http://www.youtube.com/watch?v=s-AzmNEj0EE&feature=related
Whats your explanation?
Todd
> --- In harryproa@yahoogroups.com.au, Arto Hakkarainen <ahakkara@> wrote:
> > Arto:
> >
> > Do you have any idea what the AoA of the wind to the sail would be? Theoretically and based on old experience the sail should have CoE forward of mast when the flow is attached to the sail. Then the sail would need to be sheeted from forward. If stalled the CoE probably moves closer to the mast. Some videos you sent and your own description would back this theory. I might as well be wrong guessing here at my comfy chair :)
>
> ++++++Not a clue. On the rigid wing the leading edge at times seems straight into the wind on my JR I have seen it guesstimate 15-20 degrees to the wind. I think on my JR this is due to the camber not being as large and efficiently shaped being shape in the cloth vs becambered held by battens or a preshaped wing. The CoE of sail is foward yes and the CoE can be controlled precisely. Its the configuration of the sail that allows the sheeting arrangement along with its rigid camber at center chord and the whole sail rotating when sheeted that provides its uniqueness.
>
> Todd
> > Arto
> >
>