Subject: [harryproa] Re: Free pivoting ww hull
From: "robert" <cateran1949@yahoo.co.uk>
Date: 3/7/2010, 7:32 PM
To: harryproa@yahoogroups.com.au
Reply-to:
harryproa@yahoogroups.com.au

 

Having a long lw hull without rocker or flare fixed to the ww hull gives a flat ride as the ww hull only moves up and down rather than pitching. letting the ww hull follow the contours of the waves would be more inclined to induce chunders

--- In harryproa@yahoogroups.com.au, Gardner Pomper <gardner@...> wrote:
>
> The single crossbeam idea seems like it has to deal with torsional forces
> when the ww hull tries to move independently of the lw hull. With only a 2'
> width on the crossbeam, one would think that dealing with these stresses
> might be difficult.
>
> I am sure it is doable, but it does make me wonder about just having a
> circular crossbeam (at least where it joins the ww hull) and a sleeve, like
> on the mast, and allow the ww hull to pivot independently of the lw hull. I
> know rob had a hand in building a boat like that once, but I have been
> unable to find a write up of what the advantages/disadvantages were. Can
> someone point me to an article?
>
> I guess my main concern would be if the ww hull buried itself in a steep
> wave and pivoted right over, end over end, and the ww hull ended up
> capsized, even though the lw hull didn't. Is that a realistic concern?
>
> - Gardner
>

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