-Imagine going through heavy chop. You want the minimum frontal area to avoid slowing down on impact and pitching the bow up suddenly. Have a look at the latest A class bows or those on Sodebo.
If you want to avoid spray coming over the ww bow there is the possibility of a spray rail. There was a recent talk about them on the multihull list
(Multihulls@steamrad
e-- In harryproa@yahoogrou
>
> $30?
>
> are you talking about 15degrees angle of the bowpoint?
>
> no one answered the why not full HEIGHT bows eg like trimaran floats.
>
> doug
>
> --- On Sat, 13/6/09, Robert <cateran1949@
>
>
> From: Robert <cateran1949@
> Subject: [harryproa] Re: preglassed panels....weights
> To: harryproa@yahoogrou
> Date: Saturday, 13 June, 2009, 6:49 PM
>
>
>
>
>
>
>
>
> -glass at $3/kg: that is a very good price. 15 degrees is pretty sharp but it would still give a prismatic coefficient 0f over .8.
> I was thinking below the waterline when being driven moderately, you could go to 30degrees, especially with a reverse stem decreasing the shock and increasing the time of impact, but allowing better fore aft stability and surfing ability with more initial hydrostaic lift and more hydrodynamic lifton a long fulcrum.- In harryproa@yahoogrou ps.com.au, Rob Denney <harryproa@ ..> wrote:
> >
> > G'day,
> >
> > Sue reads these posts! The boat is a weekender for the family.
> >
> > The Route de Rhum is huge, both in France and in terms of getting harrys
> > accepted. A full carbon hull would be 300 gsm each side of the foam. I am
> > using 400 glass. As the areas are pretty small, this is a significant, but
> > not enormous saving. The cost difference is significant as carbon cloth
> > costs about $150/kg, glass about $3 and I am paying for it from harry
> > earnings, including the sale of Elementarry, if anyone is interested.
> >
> > Squid is looking for a sponsor, will have a balls to the wall racer if he
> > can find one, otherwise a cruiser when he saves his pennies. The RdR
> > sailors (there are 2 possibilities) are also looking for a sponsor, want to
> > stay quiet until they have one. Both are very experienced short handed
> > sailors.
> >
> > regards,
> >
> > Rob
> >
> >
> >
> > On Thu, Jun 11, 2009 at 4:27 PM, Doug Haines <doha720@ > wrote:
> >
> > >
> > >
> > > hi rob,
> > >
> > > re-read your post and think the fact that you have said that your own boat
> > > is to be built as a glass boat desrves some topic comment further.
> > > do you like to keep something for the future to aspire to make/own.
> > > thought you'd have gone totally within reasons for best of everything which
> > > seems to have as of a fair while ago becopme standard to use carbon.
> > > even I was wondering how much more it would be, and costs and weights.
> > > I can see the route de rhum is a big event, but is that not open to all in
> > > an open division.
> > >
> > > maybe you could share the calculation total on glass as versus carbon with
> > > us.
> > > as a harryproa flagship it would be nice to see it skimpd on nothing.
> > > otherwise it's a cruising family weekender, which is it going to be?
> > > a cruiser / racer.
> > > what is squid wanting?
> > > and who exactly asked for a boat in the route de rhum? is there a cruising
> > > division as well?
> > >
> > > doug
> > >
> > > --- On *Thu, 11/6/09, Rob Denney <harryproa@ ..>* wrote:
> > >
> > >
> > > From: Rob Denney <harryproa@ ..>
> > > Subject: Re: [harryproa] Re: preglassed panels....weights
> > > To: harryproa@yahoogrou ps.com.au
> > > Date: Thursday, 11 June, 2009, 4:58 PM
> > >
> > > Not sure what 3.5 kg panel you are referring to, but I calculate panel
> > > weight as follows:
> > >
> > > weight of glass = weight of resin so weight of glass *4 plus core thickness
> > > in metres * weight per cubic metre (80 is near enough for both foam and
> > > polycore, cedar is 350, kiri 290) plus 200 gsm per side for foam and
> > > polycore, 50 gsm per side for timber.
> > >
> > > so 400 gsm glass either side of 10mm foam will be (4*0.4) + (0.01*.08)+(
> > > 2*.2) = 2.8 kgs per sq m.
> > >
> > > regards,
> > > Rob
> > >
> > > On Thu, Jun 11, 2009 at 2:47 PM, Doug Haines <doha720@yahoo. co.uk<http://uk.mc264. mail.yahoo. com/mc/compose? to=doha720@ ...>
> > > > wrote:
> > >
> > >>
> > >>
> > >> as usual, I am not too sure what you're on about, but sounds possible.
> > >>
> > >> I am using up odd bits of core to make shelves/tablette/ bunk so had to
> > >> shape and work lots of bits. took all day long and very fiddly. a piece of
> > >> foam you can make a pencil line and cut it with a knife and voila!
> > >>
> > >> this is mostly 5mm and some 10mm, the bigger thick panels would have even
> > >> bigger holes .. to fill!
> > >>
> > >> On panel weights, I was starting to list the per sqm weights....
> > >>
> > >> sidecar - elementarry, 5mm core and 260g db: 1.0 kg glass/resin + 400kg
> > >> foam or 1.4 kg kiri core. plus wet out of foam I think was about 200g per
> > >> sqm. Is there a wet out /soak in initial amount of resin to coat onto kiri?
> > >>
> > >> anyway that's 2.0 kg persqm of foam / glass panel
> > >> or 3.0 kg/sqm of kiri / glass.
> > >>
> > >> not sure how much bog counts as, seems like it uses up heaps of resin, but
> > >> most of that is sanded off again.
> > >> then paint, especially anitfoul must be heavy.
> > >>
> > >> then add up all tapes across joins, reinforcing double layer glass at
> > >> mast, beams, plus bulkheads, fitting attachments, and you can total the
> > >> whole hull ( simple to start with lw hull first). It is called a composite
> > >> boat because it is cimposed of many smaller parts.
> > >>
> > >> What was Rob's 3.5 kg panel weight made of?
> > >>
> > >> Doug
> > >> Mandurah today
> > >>
> > >> --- On *Thu, 11/6/09, Robert <cateran1949@ yahoo.co. uk<http://uk.mc264. mail.yahoo. com/mc/compose? to=cateran1949@ ...>
> > >> >* wrote:
> > >>
> > >>
> > >> From: Robert <cateran1949@ yahoo.co. uk<http://uk.mc264. mail.yahoo. com/mc/compose? to=cateran1949@ ...>
> > >> >
> > >> Subject: [harryproa] Re: preglassed panels
> > >> To: harryproa@yahoogrou ps.com.au<http://uk.mc264. mail.yahoo. com/mc/compose? to=harryproa@ yahoogroups. com.au>
> > >> Date: Thursday, 11 June, 2009, 3:53 PM
> > >>
> > >> Have you tried the right primer on the polyprop before bogging. I have
> > >> used primer to get a good grip for painting a polyprop bumper bar.
> > >> Depends what foam it is cheaper than. I like it, apart from the price, for
> > >> its ability to take impact. Some of the other foams disintegrate under
> > >> impact and the good ones cost a lot more.
> > >> It is possible to seal edges by heating, but on a long section it is too
> > >> easy to stretch the edge and put the panel out of shape. . It should be
> > >> possible to do about 60cm a time and nick the end of each section before
> > >> heat pressing to avoid this.
> > >> For internal edge finishing I was thinking of a routed out channel in a
> > >> piece of timber to slip over the edge.
> > >> how necessary is it to bog all the joints rather than simply putting
> > >> another strip of tape to stiffen it
> > >>
> > >> It would certainly be easier to just use foam
> > >>
> > >> --- In harryproa@yahoogrou ps.com.au<http://uk.mc264. mail.yahoo. com/mc/compose? to=harryproa% 40yahoogroups. com.au>,
> > >> Doug Haines <doha720@ > wrote:
> > >> >
> > >> > word of warning - polycore is a pain to work with, wherever edges join,
> > >> finish or whatever happens at the edge of your panel, it's really a lot of
> > >> extra work to fill all the honeycomb holes I find. Just more extra jobs/time
> > >> you don't need like when it should be simple panel cut, fit in and join
> > >> becomes bog all the gaps, mix extra resin and the smooth plastic honeycomb
> > >> is not very grippy for the bog either.
> > >> > I believe the honeycomb is cheaper by 15-20% over foam core is that
> > >> right? Hmmmn...tough choice.
> > >> > No local polycore in W.A., makes it same price as foam to tansport from
> > >> Queensland, so I have been getting 5mm foam sheets for all the bits of stuff
> > >> Lately.
> > >> > Foams good for a quick poly urethane glue join together and sticking
> > >> into place and you are bonded ready to get the epoxy on in not too long at
> > >> all.
> > >> > Just saying it is a definite shortfall of the polycoe Robert, sorry to
> > >> throw you out.
> > >> >
> > >> > Doug
> > >> >
> > >> > --- On Thu, 11/6/09, Robert <cateran1949@ ...> wrote:
> > >> >
> > >> >
> > >> > From: Robert <cateran1949@ ...>
> > >> > Subject: [harryproa] preglassed panels
> > >> > To: harryproa@yahoogrou ps.com.au<http://uk.mc264. mail.yahoo. com/mc/compose? to=harryproa% 40yahoogroups. com.au>
> > >> > Date: Thursday, 11 June, 2009, 11:41 AM
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> > I was looking at the preglassed panels of polycore and was thinking how
> > >> a 12.5mx2.5m preglassed panel could have shallow cuts on the inside of the
> > >> bilge to allow bending and only need a little glassing to finish. The panels
> > >> don't seem to be that much more than doing it yourself and would take some
> > >> of the stress out of things and should come in at a good weight and quality
> > >> being heat pressed. There may be no weight difference in the final boat. Not
> > >> sure of the costs of transporting 6 large panels compared to packs of 50
> > >> small ones. 6.25 x 1.250 might be more feasible. I am waiting to find the
> > >> actual price of double bias 440g preglassed to get a better comparison of
> > >> price.
> > >> >
> > >>
> > >>
> > >>
> > >
> > >
> > >
> >
>
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