-The sheer strength should be enough, if you look at strength before
breaking point.The polyprop moves a lot further before breakage. This
gives it good resilience. The sheer stiffness is not as much as some
materials but seems adequate. I think the polycore is slightly higher
in sheer strength and stiffness than nida core,
Robert -- In harryproa@yahoogrou
<captian_rapscallio
>
>
> The even thicknesses question brings the KSS method into play. I have
> nida core (like polycore)samples. I believe the nida core doesn't have
> the shear strength Core cell does, and this epoxy foam is close to
> core cell of equal density. I don't know enough about FEM to calculate
> scantlings for multihulls, so I can't say if the final build would be
> lighter.
>
>
>
>
>
> --- In harryproa@yahoogrou
> >
> > -I am not sure how you go about making even thickness cores with this
> > product. ,\
> > The weight is twice that of polycore, but that does not include the
> > extra resin taken up by the scrim
> > Robert-- In harryproa@yahoogrou
> > <captian_rapscallio
> > >
> > >
> > > I'll have to look into Microballoons or Q cell. I liked the ash
> > > because it was very cheap (.15 a pound) and I saw increases in
tensile
> > > strength. I think a coupling agent is bonding the ash to the epoxy.
> > >
> > > http://www.mcmc-
> > >
> > > As for the weight of the foam, at 170 kg/m^3 the foam seems to
perform
> > > close to core-cell. I've seen better performance with the ash and
> > > short carbon fiber filler. If cost was no object I would probably go
> > > for a SAN foam, but this stuff seems to have a pretty good bang for
> > > the buck.
> > >
> > >
> > > --- In harryproa@yahoogrou
wrote:
> > > >
> > > > G'day,
> > > > Where are the properties of the epoxy foam you are referring to?
> > > > Microballoons or Q cell will give a lighter end product than
the fly
> > > > ash.
> > > >
> > > > regards,
> > > >
> > > > Rob
> > > >
> > > > On Sun, Apr 20, 2008 at 6:14 AM, captian_rapscallion
> > > > <captian_rapscallio
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > --- In harryproa@yahoogrou
<chesapeake410@
> > > > >
> > > > > I realize most boatbuilders use vinylester, but it is actually
> > > cheaper
> > > > > for me to buy epoxy vs. vinylester. I can't get vinylester for
> > under
> > > > > 50 bucks a gallon, but I can buy epoxy for that.
> > > > >
> > > > > Take a look at the physical properities on the SC epoxy foam.
> Looks
> > > > > pretty good compared to core cell.
> > > > >
> > > > >
> > > >
> > >
> >
>
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