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

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.



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

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

you'll have to rewrite my email address to get to me
ceilydh AT 3web dot net
(fools the spammers)

Jim-
Thanks for the link, I have been following the posts on f-boat and will
look at the Multi forum. Myself and a friend have done the enginnering,
as we have both designed boats before and actually I have done a mast
before also, but it was for a 27' tri. I was very happy with that mast
but am always looking for more information.

Gilbert

Evan,

I will be designing it and have a company build it for me I have had a
production run done for a 36' composite done before that I was very
happy with. I am familiar with the needs for buckling resistance.
I can achieve and Mod. E=10*10^6psi.

I was just looking for more peoples opinion. I have noticed that more
masts break that should.

Thanks,
Gilbert