Subject: Re: [harryproa] Re: Hinging masts
From: Doug Haines
Date: 11/28/2006, 1:42 AM

You mean for retro installing the centre mast tube in the hull?
See pics of Elementatty can see carbon black round where hole was cut (under single ruddder/mast  of photos in yahoo discussion group.

Robert <> wrote:
Just wondering how big a hole is needed in the deck,
RObert--- In, Doug Haines <doha720@...>
> Hi,
> I went to Rob Denny's house in Swanbourne yesterday and looked
and talked. He does well without a proper shed, though the double
garage is pretty good.
> Elementarry stuff I liked were the newest version of the rudder
(single on a slide from one end to the other), that kicks up if hit,
this is good engineering, because you can't raise the rudder up, like
to see how it works on the water.
> I liked the wing mast made from a single peice of this
honeycombed stuff of plastic I thimk it is the polycore at $20 a sqm
(6mm thick size).
> Hinging for me is best by leaving the mast as usual with a bit
more space at the bottom and making a tabernacle if you can call it
that up over the bottom stem. This should include a removable 4th
side and 3 permanent sides so you can let the mast swing down when
you take the 4th side off. Seemed pactical enough with carbon and
squaring the stem to fit the tabernacle sides.
> Doug
> Robert <cateran1949@...> wrote:
> Should be possible. Have to offset the masts slightly so
they don't
> interfere with each other as they lean towards the centre of the lw
> hull.For going under bridges, you wouldn't have to remove the masts
> but simply leave them tilted,
> RObert --- In, Dave Howorth
> <Dave.Howorth@> wrote:
> >
> > On Fri, 2006-11-24 at 04:27 +0000, Robert wrote:
> > > -What I thought about earlier is to have a hinged sleeve. Lift
> the
> > > mast till it is out of the hull but still in the sleeve and
> you
> > > can lay it flat with control,
> > > Robert
> >
> > If it can be managed, perhaps it would be simpler to hinge the
> tube
> > itself. I.e. the mast is supported by a tube between deck and
> and
> > this tube has a hinge at deck level.
> >
> > When upright, the tube can be supported on three sides (windward,
> > leeward and a bow) by permanent structure bonded into the hull.
> > fourth side can be supported by a wedge dropped into place after
> > mast is swung upright, with the wedge itself supported by further
> > permanent structure.
> >
> > Then there's no need to lift the mast vertically at all, and no
> need to
> > align a 'sleeve' and a 'tube' when inserting the mast. Dropping
> mast
> > goes as follows:
> > (1) Pull halyard out to bow on same side as wedge, and secure to
> hold
> > mast.
> > (2) Lift out wedge.
> > (3) Slacken halyard and rotate mast until it is level (or nearly
> so).
> > (4) Pull mast out of tube.
> >
> > Raising is the reverse.
> >
> > Cheers, Dave
> >
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