Subject: Re: [harryproa] Re: Hinging masts
From: Dave Howorth
Date: 11/26/2006, 5:43 PM

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 then you
> can lay it flat with control,
> Robert

If it can be managed, perhaps it would be simpler to hinge the mast tube
itself. I.e. the mast is supported by a tube between deck and keel, 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. The
fourth side can be supported by a wedge dropped into place after the
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 the mast
goes as follows:
(1) Pull halyard out to bow on same side as wedge, and secure to hold
(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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