The finish I am thinking of is most of the hull made from flatt sheet
on tables with a few taped joins. The table finish would just be
painted and the fibreglass taping at the deck join I would leave as a
way of getting non slip at the edge to avoid slipping over the
side.Taping elsewhere on the sides I would try to make nice and smooth
but I am after a boat to sail. every extra kg of bog is an enemy to
performance ( I am trying to drop another 5-10kg myself to improve my
performance;
have even been considering bamboo mat as the inner surface instead of
fibreglass. It is slightly lighter and stiffer than glass but I have
yet to source a supplier at the right price. Otherwise , it would
simply be painted with little or no fairing. Certainly not a moulded
gelcoat finish.
For weight estimation, I would go for a pound a square foot for any
extra material over that on the latest Harry and I am allowing an
extra 100kg for going schooner rig with a slightly heavier boat. The
forces may be concentrated in the area around the masts, but there is
a fair bit of transfer of torque from the front to the rear and that
has to go through the dropdown section of the lw hull. Rounding the
corners with an 8"radius would significantly reduce the concentration
--- In harryproa@yahoogrou
>
> Robert,
> Yes, I am deliberately overestimating since I am not at the detail stage
> enough to be able to itemize every bit and I am particularly ignorant of
> calculating the weights of things like beams, masts and booms. My
hope is by
> overestimating the skin, I get a reasonable approximation on the overall
> weight before I have to get down to the details, just to see if the
design
> is feasable. Since this calculation done on the Harry on the
Harryproa web
> site gives me a comparable number to what is listed, I am hopeful it
is a
> reasonable yardstick.
>
> You make a point of the finish. This has been mentioned before. I am
unclear
> as to what you mean by it. Every boat I have owned, and all the
decent ones
> I have seen, have either had a gelcoat finish (for fiberglass boats)
or a
> glassy smooth epoxy finish (my cold molded monohull) on the
exterior. Are
> you inidicating something else for exterior finish, or are you just
speaking
> of interior?
>
> I did have a trimaran where the interior finish was visible
fiberglass mat,
> just painted. That was not particularly appealing. Are you speaking of a
> finish similar to that, or of one somewhere between that and a mirrored
> gelcoat finish?
>
> I would also like to ask this question of Rob and the boats bigger than
> harriette, such as Rapscallion and the larger boats in planning for
China.
> How can you describe the level of finish that the quotes are based on?
>
> Thanks,
>
> - Gardner
>
>
>
>
> On Sun, Dec 14, 2008 at 6:03 PM, Robert <cateran1949@
>
> > I feel you are over estimating the weight of the skin. I was hoping
> > for something in the order of 3.2kg/m2. This equates to less than a
> > pound a square foot. My calculations are
> > Polycore 10mm ¬ .7 kg/m2
> > glass 600gx2 1.2 kg/m2
> > resin, including what is needed to wet out scrim
> > 1kg/m2
> > paint and bog .1kg/m2 (I am not after a perfect finish!)
> >
> > I suppose I need another 25% for overlaps etc so this would come to
> > 4kg/m2 or 1 pound a square foot.
> > I think fo the ww hull as it is less stressed, it may be possible to
> > get away with 400g each side for glass. Thiugh by the time all the
> > internal furnishings are taken into account, there is a fair bit more
> > surface area and joins.
> > I get around 120m2 for the hulls of the 15mlw/9mww Harry concept I
> > have been playing around with (sideways sleeping double in ww hull
> > with kick out foot locker, two cosy doubles for sheltered waters for
> > guests, small saloon down below in ww hull with porta potti and sit
> > down shower. I am also looking at schooner rig, which is probably a
> > bit silly as it requires extra hands to organise a shunt. The total
> > for the hulls comes to about 600kg. Hopefully about 1 to 1.2 tonne
> > all up sailing (before heavy stuff such as stores, people, motor and
> > ground tackle).
> > This is not much different from the weights on the Harryproa site for
> > the 12m/9m Harry,the difference mainly in the extra length and
> > accommodation in the lee hull.
> > My limitations are for towing on public roads. ie to reduce to 3m
> > wide ad 40' trailer length.
> > regards,
> > Robert
> >
> >
> > wrote:
> >
> > >
> > > Thanks Rob,
> > > I have been concerned why mine weighs so much more than the latest
> > harry on
> > > the web site and tried a new layout very similar to that one; 2
> > doubles in
> > > the ww hull, nothing in the lw hull. To maintain the ability to
> > contract to
> > > 7.5' beam, I overlapped the whole ww hull between the crossbeams
> > onto the lw
> > > hull, giving the lw hull between the crossbeams just a 2' freeboard,
> > which I
> > > could do because of the schooner rig.
> > >
> > > Those changes look like they save 300-400 pounds on the weight and
> > put empty
> > > hull weight estimates in line with the listed weight for the harry
> > on the
> > > harryproa site. My estimates do not include the crossbeams or rig or
> > rudders
> > > or any interior outfitting, so the 2 lbs/sq ft I am using probably
> > > overestimates the hull weight, to help compensate for the things I
> > am not
> > > counting.
> > >
> > > Anyway, I think I prefer the layout I posted, with 1 double in the
> > ww and 2
> > > singles in the lw hull. It has a touch more room in the cockpit
and the
> > > galley is larger. The booms are easier to reach for reefing and I
> > think 1
> > > double and 2 singles is a more flexible sleeping arrangment, but the
> > other
> > > layout is lighter and has 2 doubles in the same hull with the head,
> > so if
> > > anyone is interested in the lighter version, I can send or post that
> > layout
> > > as well.
> > >
> > > - Gardner
> > >
> > >
> > > On Sat, Dec 13, 2008 at 4:42 PM, Rob Denney <harryproa@> wrote:
> > >
> > > > G'day,
> > > >
> > > > Sounds great to me. And to my wife,who thought of most of the
> > other names.
> > > > More importantly, it looks prett good as well.
> > > >
> > > > Regards,
> > > >
> > > > Rob.
> > > >
> > > > On Sun, Dec 14, 2008 at 12:53 AM, Gardner Pomper
> > <gardner@<gardner%
> > > > wrote:
> > > > > I definitely think that "Contrarry" is a winner. The only
caveat is
> > > > > that I think we would need rob's approval, since all those other
> > names
> > > > > are his designs. Hppefully that won't be a big problem
because all I
> > > > > have really done is a layout; I still plan on having Rpb
design it.
> > > > >
> > > > > - Gardner
> > > > >
> > > > > On 12/13/08, Mike Crawford <jmichael@ <jmichael%40gwi.
> > > > wrote:
> > > > >>
> > > > >> Beautiful in its simplicity. Plus it's a single word like
> > visionarry,
> > > > >> elementarry, solitarry, and harrigami.
> > > > >>
> > > > >> - Mike
> > > > >>
> > > > >>
> > > > >>
> > > > >> Peter Southwood wrote:
> > > > >>>
> > > > >>> How about Contrarry
> > > > >>> Cheers,
> > > > >>> Peter
> > > > >>>
> > > > >>
> > > > >
> > > > >
> > > >
> > > >
> > > >
> > >
> >
> > Messages in this topic
> >
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