-A simple sliding in telescoping beams is pretty simple.There is
plenty of bury available. three metre wide ww hull and only narrowing
by less than two metres, leaves a metre to play with. There is a bit
of fiddling to anchor the the ends but not insurmountable. The
advantage, is there are no fancy hinges , just simple beams and
sockets I don't see too many problems with sealing the crossbeams, as
the sockets could be separated from the inside volume, or just wrap a
boot around the point of insertion. I looked at folding systems and I
worked out how a folding system to trailing is possible. Just a bit of
drama in removing the mast, but not insurmountable. I felt that if I
had to trailer, then I can simply take the beams out, but I could see
situations where I would like to quickly narrow and still be able to
gently sail.
Robert
-- In harryproa@yahoogrou
>
> G'day,
>
> Cat to fold is an interesting solution. To get 3560 degrees on the
tillers,
> mount the rudders on the beams, although this may mess up the
scissoring.
> Could also put the rudders in the hulls in daggerboard cases, if you
really
> wanted to scissor it.
>
> regards,
> Rob
>
> >
> >
> > I am aware of cat2fold desing and actually thought it
> > would be the best solution for a folding big proa.
> > Trailering is not an issue for me. Accessing marinas
> > is. The scissor-like mechanism of cat2fold design
> > would probably offer most reliable and solid solution
> > to folding while afloat. To get reasonable beam while
> > folded steering wheels should be in the cockpit
> > (tillers would be better but I haven't been able to
> > figure out how to get 360 degrees rotation functional
> > with tillers). Rigid walkway and optional dingy ramp
> > would be hard to fit to folding option though. They
> > would be very nice but I haven't been able to figure
> > out those details yet. One monohull design had
> > removable walkway part of cockpit bottom that doubled
> > as gangplank. Perhaps removable/folding walkway and
> > dinghy ramp that can be lowered while folded. Two
> > gangplanks that can be attached between hulls as
> > walkway? Or perhaps just live without the added
> > complexity..
> > again.
> >
> > Arto
> >
> >
> >
>
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