--- In harryproa@..., "Rob Denney" <proa@t...> wrote:
> G'day,
>
The lw hull cannot be much lower without beam height
> restrictions. The original Harry had a mast tower and the beams
mounted on
> posts, so height overall was pretty similar. A rule of thumb is
that 10% of
> the mast height should be between the bearings. 12m mast, 1.2m lw
hull
> height. Can be less, but the loads go up pretty spectacularly.
>
>
>
> Rob,
I thought the strength required was based upon the righting moment?
Thanks for the patience. It helps me appreciate the design
understanding the engineering restrictions. Slabsides could be
marginally better in heavy chop at moderate speeds but would severely
cut down on accommodation. I still love the look of original Harry,
but I can understand the changes. Step hulls would be a pain to build
and require extra strengthening and weight and would probably be
worse at slow speeds in chop.
What has happened to Harry?


>
>
>
> ----- Original Message -----
> From: "Robert" <cateran1949@y...>
> To: <harryproa@...>
> Sent: Friday, November 07, 2003 8:32 AM
> Subject: [harryproa] Re: Towability of extended harry
>
>
> > --- In harryproa@..., "Rob Denney" <proa@t...>
wrote:
> > > G'day,
> > >
> > > This is what I did on Harrigami. The limiting factor is not so
> > much the
> > > width of the bunks, as the height of the lw hull which sits
under
> > the
> > > overhang.
> >
> > I assume that you have wracked your brains over the issue, asking
> > such questions such as
> >
> > Does the lw hull have to rise so high in the middle? In the
original
> > Harry it isn't. Is the height needed for support of the spar or
are
> > there other reasons? Can the sides of the ww hull be made more
> > vertical?
> > Origami is certainly a severe design constraint for a boat.
> > Robert
> >
> >
> >
> >
> >
> >
> >
> > Here the rules are not a problem, as long as the number plate and
> > > trailer lights are within a metre of the rear of the load.
Going
> > round
> > > corners with a 12m/40' load is sometimes a challenge, but
otherwise
> > it is
> > > all pretty easy.
> > >
> > > Regards,
> > >
> > > rob
> > > ----- Original Message -----
> > > From: "Robert" <cateran1949@y...>
> > > To: <harryproa@...>
> > > Sent: Friday, October 31, 2003 8:45 AM
> > > Subject: [harryproa] Towability of extended harry
> > >
> > >
> > > > Would it be possible to truncate the lw side of the ww hulls
with
> > a
> > > > flat side to exactly 2.5m for towing. This would still provide
> > almost
> > > > the same sleeping width. Are there other issues such as
length and
> > > > overhang that limit towing size.
> > > >
> > > >
> > > > Robert
> > > >
> > > >
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> > > >
> > > >
> > > >
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> > > >
> > > >
> >
> >
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> >
> >