Subject: [harryproa] Re: Mast raising
From: "rattus32" <>
Date: 7/3/2006, 2:06 PM

--- In, "Robert" <cateran1949@y...> wrote:
> -G'day Mike
>  I was thinking on similar lines but don't se much problem holding up
> the ww hull. There is not an enormous weight off centre and a
> vertical  bit of box section on the ww side triangulated at the base
> should provide enough support for the hull with a couple of tie down
> straps to hold it against. Either that and/or a support under the
> junction of the wing deck and hull. This would have to be to the lw
> side of the c of g.of the www hull on its own.
>  If the crossbeams had a temporary controlling system such as a
> farrier wishbone with a sleeve to allow sliding of the crossbeam, or
> even a complete folding system as designed by Jim Shanahan then the
> only difficulty is moving the lw hulls off the trailer and onto a
> trolley as everything else can be controlled with a couple of
> winches. Jim's system makes a lot of sense and would even allow
> righting from a complete overturning.
> My personal preference is to launch a folded system where the boat
> can then be brought side on to shore and the mast then inserted-
> possibly with sail attached. The crossbeams get winched out with
> water supporting the system and you're away.
>  I have tried to imagine taking the folded boat out onto the water
> and inserting the mast from the water. It seems theoretically
> possible but would probably be excessively difficult in practice.
> ...

Robert, do you have a link or reference to the Jim Shanahan folding system you mentioned
here? Googling "Jim Shanahan folding system" yields nothing interesting, at least on this

Been thinking along similar lines, although with a Farrier-style link system (properly
referred to as a 4-bar linkage) and sleeve to join the beam halves. Keeping the whole
assembly upright during unfolding might be an interesting challenge, though ;-)

One other question: Mike, where was the source that gave you the absolute unescorted
trailer width requirement in the US? Been looking for that information for a while; have
resorted to corresponding with individual states in the meantime. I also tape-measured a
large bulldozer at a stop here in Colorado once, it was very close to 12 feet wide and
entirely escort-free.

This is a fun problem!




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