I was actually referring to the moern split lug called a balanced rig.
Sorry I did not make this clear. This effectively becomes a Marconirig
with a square top main and jib. I am not sure why if the slot effect
is so improtant, modern biplanes have disappeared,
RObert --- In harryproa@yahoogrou
<jtaylor412@
>
> Hoyt will never be more efficient than a marconi type sail set up.
LOTS of modelling,
> math, wind tunnels and a hundred years of experience says it won't
be more efficient. A
> UNA rig falls in the same camp. I don't think that was the
inventor's intent.
>
> It's all because the the wind slot created by the jib keeps the
airflow attached on the lee
> side of mainsail. It creates a coefficient of lift on the mainsail
to approach 2.0. Doesn't
> have be a big jib, just enough to create the flow. If the airflow
separates, CL drops to .7 or
> worse. When really poor the mainsail luffs. Before that have to
watch the telltales.
>
> A single sail ala Clark "Y" or other similar thin film airfoil
shapes can at BEST get a
> coefficient of lift of 1.2. The probability of the helmsman to get
it all right is low. So we
> expect 1.0 or less.
>
> That applies to all reaches. The game changes when we are running
at very broad reach to
> downwind running. Spinnaker or mainsail bagging keeps the
coefficient of lift to near 1.2
> or even a little better, due to different ballooning effects which
to date are not always well
> understood. Hoyt does have a slight problem with good bagging on
one tack. Seems to
> run afoul with the offset mast.
>
> What is known is low aspect rigs are more forgiving to angle of
attack on all points of sail,
> which keeps performance up to the practical lift limit. Makes
catboat owners happy.
> Higher aspect una rigs take more effort to keep shape and angle of
attack in proper
> balance.
>
> All of this is a nice compare but all rigs offer a different set of
compromises that have to
> balance with the motivation and effort of the helm. If you aren't
going fast enough, make
> it bigger. Hoyt make it easier to deal with bigger??, then go for it !
>
> My personal motivation is really really low........ so will be
trying rigid wings instead.
> Might find me steering with my feet, albeit dancing with the crab
pots. Wing management
> is a single lever, no ropes, no reef, no sound. Just GO.
>
> JT
>
> --- In harryproa@yahoogrou
> >
> > -It does have an endplate that should be some improvement over the old
> > split lug. I don't see why it should be less efficient than the
> > ballestrom rig, and it remains balanced when reefed.
> > Robert
> > -- In harryproa@yahoogrou
> > <proaconstrictor@
> > >
> > > --- In harryproa@yahoogrou
> > > <gunnar.westholm@
> > > >
> > > > The Balanced Rig http://www.balanced
> > > > seems stronger and more efficient then the Hoyt rig.
> > >
> > >
> > > I doubt it's more efficient, it's just the old split lug, which
wasn't
> > > even more efficient than the lug with mast interference. Though
Newick
> > > was going to specify the split lug on one trimaran, and then it
became
> > > all top secret aa to why it didn't work.
> > >
> > >
> > > > At least if the main would be fitted with a mast sleeve, like on
> > > > windsurf and Wharrams Tiki rigs
> > > > http://www.wharram.
> > > > range/Tiki%208m%
> > >
> > > TIKI rigs seem to do OK and they are very easy to make since the
> > > correct cut seems to be totally flat. They do have the occasional
> > > reefing problem in heavy weather though.
> > >
> > > I think you could at least fit these rigs to proa though,
whereas, I;m
> > > not sure the HBR is a good condidate, though I didn't fully
think og
> > > that until I had posted it.
> > >
> > > >
> > > > /Gunnar
> > > >
> > >
> >
>
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