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wrote:

Carbon Rotating mast selection

Hi all,

I am just finishing up building my own 32' trimaran. But once
finished I will need to put it into the water and having a mast that
the sails go on would be great. The boat is similar to a corsair 31r in
many regards. It is actually a bit lighter that they are, even with all
the goodies. My question is what should I be looking for in the mast
section I choose. It will be a rotating mast with single spreaders. I
was thinking about a wing mast 9in x 4in or so. What Ixx and Iyy should
I be looking for?

Thanks for any of your help.

Gilbert Landon

"Jim Conlin" wrote in message
news:51Myd.552729$wV.103374@attbi_s54...
There are two groups on yahoo that might be helpful with this- the
F-boats group and the Multihull boat builder group.

Secondly, if you've gotten this far in building a fairly light 32' tri,
there has been some engineering done. Your designer/engineer should
have opinions on this question.

And there has been a recent discussion about the F-31 mast section in the F
boats list.

Are you building this mast yourself? Do you have some idea of what material
properties you might be able to achieve? Mast design is generally an
exercise in buckling strength so the section modulus is important but also
the "E" or Young's Modulus.

--
Evan Gatehouse

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