-Thanks All for the discussion,
I have been thinking of ways to control the flow from the sail on the
foremast to the sail on the aft mast and I think it possible to
develop a slot that can benefit the aft sail using almost rectangular
sails with the mast leaning forward ~10 degrees. I have developed a
preliminary design that may work with not to many strings. I also
have a preliminary design for the structure and the construction of
the free standing mast kinked just above the top bearing. The mast is
made in half section, straight to the start of the bend,
the forward and aft carbon srips are bent to the required curvature
and the side strips are continued in a slow wrap towards the front.
From the base new strips go straight until they hit the bend and then
do a slow wrap forward. This gives overlap at the bend and extra
reinforcing at the point of greatest stress. It is certainly more
work than a straight one, but doable.
Robert




-- In harryproa@..., "Rob Denney" <proa@t...> wrote:
> G'day,
> Good point. First off, for a given sail area on a boat without
heeling
> moment or sail area constraints, a non jib rig is fastest. eg
Formula 40
> multis, A class cats.
>
> My opinion is that the differences are that the luff of the main
is near
> enough the same distance from the leech of the headsail all the way
up, and
> the air off the headsail is constrained in where it can go.
>
> On a schooner rig, the luff of the aft sail is not paralell to the
leech of
> the foresail, making trimming very difficult, and if there is any
> seperation, the air has a chance to become messy in it's flow, thus
not
> having the same amount of energy to impart as it originally had.
>
> I guess a schooner rig with near rectangular sails mounted very
close to
> each other, may be the best way to go.
>
> I could be wrong!
>
> Regards,
>
> Rob
> ----- Original Message -----
> From: "Robert" <cateran1949@y...>
> To: <harryproa@...>
> Sent: Monday, September 01, 2003 3:09 PM
> Subject: [harryproa] Re: twin masts
>
>
> > I am curious about the difference between the dirty air from a
wing
> > sail with minimal standing rigging and the slot from a jib.
> > Robert Dalton
> >
> >
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