First, a belated welcome to the group. Great
to have someone of your experience on board.
My first proa was tortured ply. Worked
well. The first Harry was actually bending ply (2 thick outer softwood
veneers, a middle very thin one at 90, could bend to 150mm/6" radius. Also
worked well. However, for the hull shapes we wanted, strip was much
easier. See also Robert's reasons for not using it.
I am currently discussing with a couple of
prospective builders using Kurt Hughe's cylinder moulding technique. With
some variations, this also has potential.
----- Original Message -----
Sent: Friday, March 03, 2006 8:57
Subject: Re: [harryproa] Materials list,
Hi Robert and All,
think a HarryProa wuld be easily built in tortured ply technic for much less
money, labor, weight. Any reason why it wasn't used?
it I've built a 28' proa with the room of a much larger Harry for
under $2,000 in materials. And a much larger 36" Proa in about $3,000.
Robert <firstname.lastname@example.org> wrote:
my own minimal experience, it is more important to get
accurate dimensions rather than finish as you are going to
sand a lot of
it away. If you are cutting the planks yourself you can
different widths according to curvature and make the
chamfered edge at
the same time. If you really want to be fancy, you
can glue all the
strips to full length and taper and chamfer them
before you start and
almost completely avoid cheaters.
Techniques for using polyprop
honeycomb are on the nidacore site. It
is worth while looking at the
impact testing of polyprop honeycomb
sandwic compared with balsa core. A
great lump of RSJ was hoisted up
to the heoght of the shed roof and
dropped onto the sandwiches. The
polycore caused the RSJ to bouce up
into the air without damage while
the balsa fore fractured. I believe,
though I haven't tried it with
polycore that a hot iron can put
creases into the face of one side
to control bending and also to
provide resin channels for resin
infusion. I think it well worth using
vacuum bagging to reduce weight
and impove adhesion for high stress
areas but at a price of extra
consumables and effort but I am in two
minds about infusion.
The difference in price is not worth hassling
over. I'd be tempted to
use poulonia in the high stress areas to save on
glass and polycore
in the flat, low stress areas to save on time and
home.houston.rr.com/pieceofwork/index.htm is a good website to
congratulations about having suport from your boss for
Good luck wit the finances.
email@example.com, David Howie <dana-tenacity@u...>
> Part of the problem is to know whether
you are comparing apples with
> orangutans. That price for paulonia is
raw planks, need to be
dressed and cut.
> Don't know whether the
planks are to be cambered on the edges. Poly
lots of unanswered questions, how does anything bond
to it? can
an amateur work it successfully.
> Speaking of amateur I started off
thinking I knew something about
> stuff, but the deeper
I dig the less I know.
> Pity there isn't somebody else nearby who was
thinking of building
> Trying to talk my wife into a trip
to Aus when Bain's boat hits the
> (presumptive of me isn't
it?), she doesn't think much of Aus, but
> given the
project the green light if the funding happens.
------ Original Message ------
> Received: Wed, 01 Mar 2006 06:26:30
> From: "Robert" <cateran1949@y...>
> Subject: [harryproa] Re: Materials
> I couldn't get near that price for Poulonia. Suspect
rob can get
> better prices on glass and carbon. Probably
worth the freight. May
> to wait on carbon till the shortage
is overcome and prices
> manufacturing costs rather
than scarcity. Can you give areas of
> materials to allow
> My calculations for polycore are with no ply, larger
> a cockpit cover like Bain's.
calculations are not that different. I get in the order of
sailaway with schooner rig, including consumables. only $10k for
> boat materials.
--- In firstname.lastname@example.org, "oceanplodder2003" <dana-
> > OK it's in files
> > >
Yahoo! Groups Links