[MHml] Bi plane rigs.

[Rob Denney]

G'day,

> >That is not the way I read his comments.  More like "W" than a tacking
Harry
> >proa.  Build only one mast, one mast base,  one sail, put storage equal
to
> >the mast weight including the structure in the opposite hull and now you
> >have a free standing rig with all of its advantages such as being able to
> >insert the mast with the hull on its side,
>
>          Not sure I see that as an advantage, one then has to lift
> the mast and rotate the hull all at the same time, which seems more
> daunting than ever.

Pretty easy actually, especially if the beams are on the tipping hull to act
as a lever tipping it over, and a counterweight bringing it back . It is how
we do it on Elementarry when it is too windy to just pick the rig up (no
halyard, so the sail is on the mast, as is the boom) and plonk it in the
hole.   But then, inserting the mast vertically with a gin pole is pretty
easy too.  IMO your problems are not getting the mast(s) up and down, but
getting the hulls apart and together, and on and off the trailer.  Your
other problems will be excess weight on a small boat.  Knocking 60% off the
rig weight is a big step in the right direction.
>
> >  self depowering in the puffs, and
> >no blanketing.  Would it really be a deal breaker to have the mast 20%
> >heavier?  Or are you really set on trying the biplane rig?  I hope you go
> >for the biplane because I am with Bill in that I want to see more work
done
> >on it.  I think it could really be a great shorthanded rig for cats.
>
>          I have no wish to fly a hull, and I have no wish to capsize.
> The one pitchpole I did in G & S has quite satisfied me as to a
> lifetime score. Therefore a lower Cof E is attractive in a sail area
> adequate for good performance. Marchaj gave pretty good marks to the
> sprit sail. Dipping lug was better but it is a chore to handle.
> However a bi plane rig with two dipping lugs on opposite sides of
> their masts so that the windward sail is always to leeward of its
> mast would be simpler and cheaper than fully battened high roach
> sails, to the extent that one could afford a bit more sail area to
> make up for the reduced efficiency, though this would also add more
> to the drag. As it happens the first sail for the Bruce foiled
> outrigger kayak is a fully battened sprit, with the sprit hoisted
> halfway up the mast with a curved half wishbone shape. It too has the
> same area as a Laser sail. No decisions yet made as to either sail
> profile or sail area, other than adequate power provided adequately low.

Whatever, but it will be lighter and less aggro to have one rather than two.
And it will be more efficient.  The coe thing is not that big a deal with a
flexible rig that can be completely depowered by dumping one sheet.  The
extra height also comes in handy in light air.  Capsizes happen to nervous
old guys like you and me because of foul ups.  There will be fewer of these
with one rig than with two.

You could be doing a lot of work for nothing if you don't sort out the
weight budget before you start.

As to pushing you towards a Harryproa (other post), would I do something
like that?  ;-)    As Robert said, the W rig arrangement is more what I had
in mind.  It worked, it was simple, it was cheap.

If you want to minimise the time and money , build a single rig and go
sailing.  If it doesn't work, chop 2m off the top and build a second one,
then rip open the other hull and put all the reinforcing in that one as
well, then buy a second sail.

All my humble opinion, but I don't like more work than absolutely necessary
on experimental boats.


regards,

Rob
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