When you stall a foil there is no load. Thats reason why planes fall out of the sky Or Kites fall back into the windwindow.
The key is the no load and when and how to achieve it and when and how to bring it back on with out the sudden snap. 4/5 line Kites do this by controling the leading edge and adjusting aoa with the back line pulling in or out accordingly. If you don't have the experience its harder to imagine the possiblity.
http://www.youtube.com/watch?v=LrezrEfQj68
Todd
--- In harryproa@yahoogroups.com.au, Mike Crawford <mcrawf@...> wrote:
>
>
> The Maltese Falcon is most impressive.
>
> However, the rig worries me because there's no easy way to depower it,
> and keep it depowered without attention/effort, if you're not on a mega
> yacht.
>
> The Falcon is an extremely heavy monohull with full electronic control
> of those sails. Need less power? Push a button, and motors roll the
> sails in between the fixed arms. If things get hairy, the boat is heavy
> enough and strong enough to hang on until the sails are in. While
> sailing, electronics will also keep the sails at an optimum angle to the
> wind.
>
> Assuming a proa won't have those features, I'd have to say this is
> more of a racing rig, to be used only by those who really know what
> they're doing, and are prepared to capsize, than on a boat where you
> might go cruising, or on a single or dual-handed distance race.
>
> Presenting that full face of the sail to the wind during a tack or
> shunt is a problem. On a small boat, or a model, it might be fun to pop
> the windward hull out of the water during a shunt, and then to zoom off
> at the amazing speeds the dynarig is capable of. But what if you're on
> a large boat that's not easily rightable after a capsize, perhaps in
> high seas with gusty winds? That could be a disaster waiting to happen,
> particularly if there's only one person to handle the sail.
>
> Reefing the sail in those same high seas and gusty winds could also be
> a problem. With an easy rig, una rig, or junk rig, you can let the
> sheets out, the sail will weathercock, and you can take your time while
> reefing, getting a drink, peeing, or tending to an injury or equipment
> failure. For as long as you want. On the other hand, the square rig
> won't stay weathercocked in one direction, and stands the chance of
> presenting the full face of the sail to the wind, even if for a short
> period of time.
>
> Even if the boat does not capsize, shock-loading components to that
> level isn't a recipe for equipment longevity.//
>
> Again, I think the square/dynarig would be great fun on a 20'-er in
> warm waters (or with wetsuits), where you could play with the boat like
> a Hobie, flying a hull, and righting the boat if things don't work out.
> But I couldn't imagine putting that sort of stress on a lightweight proa
> in the 30' to 50' range. Putting a boat that size on its side is a bad
> day, no matter what happens afterwards.
>
> - Mike
>
> / /
> Malcolm Phillips wrote:
> >
> > How about going with a modern square rig like that used on the Maltese
> > Falcon Mega Yacht?
> > This would seem ideally suited to a proa.
> >
> > http://en.wikipedia.org/wiki/The_Maltese_Falcon_%28yacht%29
> >
> > Malcolm
>