>From: "Robert" <cateran1949@...>
>
>-Hi-Axel,
>I think you mised the point about the advantage of the Harry over
the
>Atlantic.
>Assuming that accommodation is a significant load then you want the
>accommodaton to be in the windward hull. In the Atlantic Proa, this
>is where the masts are. The Harry design allows rigging on the side
>with the widest base, while the Atlantic doesn't. This makes the
>loads on an Atlantic proa much greater. In a completely unstayed
>rig , the advantages would mainly be in accommodation and having the
>rig on the longest, most stable hull, reducing torque on the
>crossbeams.

Hi Robert.
I clearly understand the difference between Atlantic and Harryproa,
and as many here I guess, the interests of having accomodation
windward and separated from the rig seems like an evidence to me
(perhaps too much).
I was only referring to the comparison presented in the web site
cited, in which the calculations show (to my mind) no clear evidence
that the HP configuration was overall better than the Atlantic one.

>The idea of springs is intersting. I have thought a bit about it
>myself.
>There would be extra weight but that may be compensated by less
shock
>loading on the sockets but probably insignificant as the boat need
to
>be strong enough to handle the shock loadings as the boat hits waves
>front on.

>The sheeting tension changes can be avoided if the sheets run
through
>a pulley at the pivot axis.

Yes. But I was also thinking that we could take benefit from a sheet
tension change during the tilting of the LWH.
Anyway, we are far away from these little details.

>I think a shock absorber system would need to be include to avoid
>building up resonances and oscillating out of control
>The spring tension would need to be adjusted for different load
>carrying and wave conditions.

I disagree with that. I would prefer a maintenance-free system that
would be adjusted for an almost empty boat, to simplify the use. And
as load increases, it is positive in a safety-first way of thinking.

>If the pivot are already there for the folding arrangement, then a
>pile of occy straps holding the hull in place would do the job. They
>would need to be covered as they are dangerous devices

Cheers,
Axel.