G'day,

The loads are determined by the righting moment, but the layup of the mast,
and of the hull is very dependant on where those loads are applied.

The original Harry is in bits. The lee hull (with it's second deck and
single beam) is in the local yachtclub hard stand, along with my cruising
hull. The original windward hull was given to a guy who chopped it up and
used it to build a rather cool looking bridge deck cabin on his 10.5m/35'
cat. The beams and mast are on 2 different tris in Brisbane . The rudders
and cassettes are on the harry in Maine. The boom is in the pile of old
boat bits down the side of my house.

Regards,

Rob
----- Original Message -----
From: "Robert" <cateran1949@...>
To: <harryproa@...>
Sent: Wednesday, November 12, 2003 9:38 AM
Subject: [harryproa] Re: Towability of extended harry


> --- 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
> > > > >
> > > > >
> > > > > To unsubscribe from this group, send an email to:
> > > > > harryproa-unsubscribe@...
> > > > >
> > > > >
> > > > >
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> > > > >
> > > > >
> > > > >
> > >
> > >
> > > To unsubscribe from this group, send an email to:
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> > >
> > >
> > >
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> > >
> > >
> > >
>
>
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