As in measure of electric resistance in ohms sort of shape?
I wonder if that may influence the effect that the glass I beleive
has of being weak in compression, that is the top flange will get
compressed while the bottom is tensioned when bending(in a trimaran).
Wood is good in compression! Is carbon good too?

Doug



--- In harryproa@..., "Tony Richardson"
<atrichardson@b...> wrote:
> I'm not sure if upper or lower case but I tried to paste it as a
symbol into the email and by the looks of it it didn't work.
> The symbol looks like a 0 with the bottom chopped out and two
horizontal lines attached at the bottom.
> sortof _0_ but with the lines attached.
> Pioneer electronics use it as a symbol as well.
> Rgs
> Tony
> ----- Original Message -----
> From: Robert
> To: harryproa@...
> Sent: Friday, June 04, 2004 12:28 PM
> Subject: [harryproa] Re: Beams to windward hull
>
>
> Sorry Tony,
> Is that an upper case omega or lower case? Can you give a more
> detailed description?
>
> Robert
> -- In harryproa@..., "Tony Richardson"
> <atrichardson@b...> wrote:
> > Has anyone tried an omega shape Ω or variants of that shape
for
> beams ?
> > I remember the small Kendrick tri (scarab) having something
similar
> > Rgs
> > Tony
> > ----- Original Message -----
> > From: Robert
> > To: harryproa@...
> > Sent: Friday, June 04, 2004 11:21 AM
> > Subject: [harryproa] Re: Beams to windward hull
> >
> >
> > Horses for courses. It is hard to beat bamboo for ability to
take
> > loads and torque from all directions but if the bamboo was
> > constrained with the load more in one direction I would
imagine
> it
> > would end up more oval.
> > If there is no problem with torque go for an I beam. My idea
for
> a
> > folding beam is based on an I beam, allowing easier load
transfer
> > when partly folded, with judicious addition of fairing to
provide
> > resistance to torque and fore and aft bending moment. It is
> tempting
> > to just buy some of those composite beams used in the
building
> > industry as a start
> > For simplicity in building and reasonably close to optimum I
> would
> > go for a ring framed wooden box section reinforced on the
corners
> > with carbon tow. This way the web can also act as a flange.
> > Fibreglass in the same circumstances would be less useful as
it
> > stretches too much and the timber goes past its limit long
before
> the
> > fibreglass takes up the strain. There may have to be some
cloth
> > reinforcement around the beam to prevent the carbon tow from
> > delaminating from the timber.
> >
> > I have been closely observing the Harry construction and I am
> most
> > impressed with the engineering. It seems to be based on years
of
> sea
> > time and knowing what breaks, and mathematical and material
> analysis
> > on how to best achieve the strength required with building
> techniques
> > within the ability and cost of the low volume builder. I
> certainly
> > wouldn't stray from the specs. This is what you're paying the
> money
> > for.
> >
> >
> > --- In harryproa@..., "Tony Richardson"
> > <atrichardson@b...> wrote:
> > >
> > > ----- Original Message -----
> > > You wrote
> > > - You have to make a box section, nothing else is
remotely
> > > comparable.
> > >
> > > I dissagree
> > > I'm no engineer but I do have a tri with round beams
> > > Rob and I built them in a female mould mostly of uni's
> > > It flies two hulls and has no seastays/wires etc
> > > They have a degree of flex in them though
> > > The beams weigh 5kg each bare.
> > > The boat is only 16ft but it is 15ft wide
> > > Rgs
> > > Tony
> >
> >
> >
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