It could also be used if one of the rudders failed as it would bring CoE forwards. A wingmast one would expect to be a bit stiffer--- In harryproa@yahoogrou
>
>
> If I had to go with a screecher, I'd go with the scheme Arto suggests,
> mounting the tack on the leeward bow and the clew on the boom. That
> would still preserve some of the ability to dump wind with just the
> mainsheet, and would allow the mainsheet to control the screecher as
> well as the main. As some point out, a reverse-balanced sail could
> cause confusion at the wrong moment.
>
> I'd actually consider two staysail self-furling screechers with
> continuous line furlers, so you can drop one and hoist the other,
> without having the windage of permanent stays. It wold also make it
> easy to keep a full-roach or squaretop main.
>
> If shunting, you could probably leave both up the whole time, and just
> furl/unfurl though the stay/head attachment wold need to be pretty
> strong in order to resist any torsion generated by the changing angle of
> the mast.
>
> I might not go to the mast top, though. If the proa is already around
> a Bruce of 1.8, the screecher is already overkill in some ways. The
> lower stress on the mast due to a fractional rig might be nice.
>
> This would have the added benefit of being able to sail in either
> direction even if the mainsail blows out.
>
> - Mike
>
>
> Rudolf vd Brug wrote:
> >
> >
> > Hi
> >
> > For a screecher used in light winds it should not be a problem.
> > The pull from the screecher would counteract the pull from the leech
> > of the mainsail.
> > That would result in the mast bending to leeward. As the mast is
> > designed for the max righting moment of the boat
> > the extra sail should be no problem for the mast. However
> > a headsail on an unstayed mast wil suffer from a sagging luff
> > as wind increases. So it would have to be rolled up in time as it will
> > loose shape fast when the wind gets up.
> >
> > regards,
> >
> > Rudolf
> >
> > ----- Original Message -----
> > *From:* Gardner Pomper <mailto:gardner@
> > *To:* harryproa@yahoogrou
> > <mailto:harryproa@yahoogrou
> > *Sent:* Monday, April 20, 2009 3:08 PM
> > *Subject:* Re: [harryproa] Re: extra sails for light airs
> >
> > In order for a lazy cruiser to use the sail much, I expect that having
> > it furled on the fore boom would be much easier. It would have to be
> > rolled up for each shunt, but we had to roll ours up to tack on the
> > Maine Cat.
> >
> > I had not thought of it unbalancing the rig, but it would seem that
> > could be remedied by just having a couple lines (one for each shunt
> > direction) attached to the end of the foreboom. These lines could be
> > stowed when not using the screacher. You would lose your
> > auto-depowering ability, but only when sailing in light air, and
> > letting go the screacher sheets should accomplish the same thing.
> >
> > The part that I am unclear on is the effect on the mast of a large
> > masthead foresail. I imagine it would have to be much stiffer. Is that
> > a fatal problem?
> >
> > - Gardner
> >
> > On Mon, Apr 20, 2009 at 5:54 AM, Robert <cateran1949@
> > <mailto:cateran1949
> > >
> > >
> > > -Makes a lot of sense for a mule. Is a stayless rig allowed to
> > have a
> > > staysail? For a schooner I would think a screecher off a bridle
> > between the
> > > bows. The bridle can be adjusted to bring the tack to ww for
> > better downwind
> > > performance. Also an extra triangle sail for the aft mast tacked
> > to the ww
> > > hull. Need all hands on deck when it comes to a shunt
> > >
> > > r -- In harryproa@yahoogrou
> > <mailto:harryproa%
> > <squirebug@> wrote:
> > >>
> > >> In the case of a schooner, I fancy a staysail and mule. This would
> > >> approximately double the sail area. The mule would be about 40%
> > of working
> > >> sail area, the staysail about 60%.
> > >>
> > >> Best regards
> > >> Herb
> > >>
> > >>
> > >> --- In harryproa@yahoogrou
> > <mailto:harryproa%
> > wrote:
> > >> >
> > >> > What are the latest thoughts for extra sails for light air?
> > >> > My 2c
> > >> > -Big asymmetric hanging on a bridle between the two bows.
> > This requires
> > >> > a bit of a hassle when shunting.
> > >> > _ Big symmetric attached to both lee bows with the ability to
> > harden up
> > >> > either edge whichever becomes the luff. A bit like a flexible
> > dyna rig.
> > >> > difficult to make such a sail but this is used in square
> > riggers with some
> > >> > success. Todd's examples using a stiff sail gives some
> > plausibility to this.
> > >> > If it worked, would be the easiest to shunt
> > >> > - Two screechers on roller reefing on each bow. Hard to keep
> > enough
> > >> > tension on the forestay and extra windage when not needed and
> > makes the mast
> > >> > need to work in a different way
> > >> > -Screecher or asymmetric on a prodder on the boom. Awkward to
> > balance
> > >> > the rig
> > >> > -Hang a high lift kite between the mast top and the ww bow
> > >> > -have an extra track on the mast and have a 5-6m extension to
> > get some
> > >> > of the extra wind up high. Not as much area as the other options
> > >> > -Go telescopic for an extra 60-80%. Complexity and getting
> > sails that
> > >> > cover the possible differences in mast shapes
> > >> > -Simply have a taller mast and reef earlier. extra windage
> > when not
> > >> > needed.
> > >> >
> > >>
> > >
> > >
> >
> >
>
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