BUt to do this changes significantly how the bending moment is distributed and introduces some awkward torques.--- In harryproa@yahoogrou
>
> The beams just need to be shaped this way:
> -
> \
> -
> -
> /
> -
> sorry for the crude ascii art.
> i.e. as long as the beam ends and sockets are parallel, the beams can
> be any shape in between!
>
> Mike
>
> On Jun 15, 2009, at 1:09 PM, Mike Crawford wrote:
>
> >
> >
> >
> > It's also my impression that the goal is to demount, not
> > telescope. The trick is how the ends are attached.
> >
> > I've been assuming that they fit into a socket in order to
> > maximize contact area and minimize stress points. And if the
> > sockets are tight enough to provide that contact area, I don't
> > believe the splayed beams will slide in.
> >
> > If you had a series of large bolts on one end, and could slide the
> > beams up into place from underneath, that might work. It could be a
> > socket with the bottom edge open. But I'd still worry about
> > concentrating stress where bolts attach.
> >
> > - Mike
> >
> >
> > jrwells2007 wrote:
> >
> >> I assume what Doug is getting at with splayed beams is to have
> >> beams that are demountable not telescopic. The primary concern is
> >> for trailering and not bothering about reducing beam for berthing.
> >> The attachment of the beams to the hulls would require some other
> >> system rather than a sleeve for at least one of the beam ends
> >> unless there is sufficient lateral flexibility of the beams to
> >> insert into a short sleeve probably at the ww hull end.
> >>
> >> John
> >>
> >> --- In harryproa@yahoogrou
> >> wrote:
> >> >
> >> > Doug,
> >> >
> >> > While I'm not sold on Robert's reverse sheer idea (I like the egg
> >> > cross section -- to each his own), I do think he has a point here.
> >> >
> >> > To test his theory, I'd cut two short hulls from scrap foam (30
> >> cm and
> >> > 45 cm each) and make some beams out of dowels or pencils.
> >> >
> >> > For the first test, attach the beams parallel for one test, buried
> >> > into the hull pieces by at least 2 cm, and see how they will
> >> slide into
> >> > and out of the holds in the foam.
> >> >
> >> > For the second test, attach the beams at a 30 to 45 degree angle,
> >> > again with 2 cm bury, and then see how smoothly you can get them to
> >> > slide in and out of the holes when both "beams" are in. I realize
> >> you
> >> > probably won't toe the beams out at 45 degrees, but the point is
> >> to test
> >> > the theory.
> >> >
> >> > In the end, I think you'll find that: a) either the beams need to
> >> be
> >> > parallel, or b) the ends of the beams need to be parallel, even
> >> if the
> >> > main portion of the beam angles out.
> >> >
> >> > - Mike
> >>
> >>
> >
> >
>
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