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The I stands for moment of inertia of the section and it’s given for the long and short axis of the spar section or column etc. It is a measurement of how strong (stiff) the spar will be. The people that can answer your question won’t without more information and even then probably won’t for all the usual reasons. I don’t want to be unfriendly but offering engineering advice with only half the needed information will only get you a half ass answer.
If you are building your own mast you are starting out without enough information and might want to step back and either study up a bit or select a different plan of action. If you are having a qualified shop do the job they can advise you as to what is a suitable section. If the shop can’t answer the question then they are, at least in my opinion, an unsuitable shop or things have changed since I was in the business.
Good luck and all the best,
Robert Gainer
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Study the history of naval architecture and move forward knowing what didn’t work before.
Don’t waste time making the same old mistakes but instead make new ones and to insure your place in history be sure the mistakes are big ones.
Never design a mast that is weaker then the boat
Never design a boat that is weaker then the mast
Never listen to someone describe why your project will not work unless they can show you the broken pieces of their own version.
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