-This seems too much glass. Maybe that on the bottom, but the rest
about half that except maybe between the beams on the lw hull. The
rest of the boat has very little in the way of sailing loads.
I was looking at 600g glass for the skins of a 50'/32'Harry but was
considering an extra layer on the bottom for abrasion resistance. I
was also looking at either 10 or 12mm core, eeven considering double
layers of 6mm for tight bends, but Rob reckons I can probably get away
with not needing to do this-- In harryproa@yahoogroups.com.au, Gardner
Pomper <gardner@...> wrote:
>
> Hi,
> I finally got hold of a copy of Dave Gerr's "Elements of Boat Strength",
> which looks to have lots of good information, but it states that is
really
> is not for multihull design, so I am not sure what to use and what to
> ignore. From the various equations he lists, adjusted as best I can
for a
> proa design, it seems that a 50' proa hull for something like Visionarry
> should be built with 3 layers of 600gsm fiberglass cloth on the
outside and
> 2 layers on the inside, with a 14mm core. Is that similar to the actual
> construction? If not, please correct me. If you could explain the
> differences, because of the proa design or my limited undertanding,
I would
> be grateful.
>
> Thanks,
>
> - Gardner
> York, PA
>