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On 21 Oct 2004 17:01:27 -0700,
(peterMelbourneAustralia) wrote:
From my days sailing windrush catamarans, I am a littel worried that
the 82mm diameter might not be enough. I know circular section is not
high performance but that is not of concern. I am keen on this section
because it is new, made of high grade metal, from a professional and
failry cheap, $250 Australian.

I intend to go cruising, thus needs to be able of withstanding strong
winds. Have every intention of reefing when gets blowy. 23ft proa
weighs 200kg unladen.

Will/should 82mm diameter be sufficent?

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You really need to consult with an experienced spar maker. One of my
old sailboats was once dismasted and I was surprised to learn that the
key engineering variable is not sail area or wind speed; instead it is
righting moment.