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On 13 Oct 2005 06:31:49 -0700, wrote:

Is this simply the moment of inertia of the mast and objects along it
or is it some kind of definition specific to yachts. Does it include
the contribution due to sails and rigging? If not, moment of inertia
is a fairly simple concept. If it is the simple physics definition,
let me know and I'll show you how to estimate it (or even calculate for
simple cases).

Thanks, I don't really want to calculate it myself, I'm trying to
understand the correlation between figures given to me by the
architecht, and the tree trunk mast sections that the mast suppliers
want to give to me.

Pete