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Ed Nye
11-12-2000, 04:02 PM
I have been fooling around wiht Robert tyrrell's mast design software (http://www.carlsondesign.com/#Professional_Shareware. I have a probably dumb question, but when you figure the sail size for the main mast do you use the total for headsails and main? Just the main? Or something else!

When you think about the possibilities and stress on the stick, the compression loads are greater than just the main, but not the same as with a cat rig and a larger sail?

So what do you all think?
Ed

John Read
12-16-2002, 12:41 PM
Did you find the answer? Can you share it?

mmd
12-16-2002, 12:58 PM
Calculate the loads imparted by every rag that will be attached to the stick.

john welsford
12-16-2002, 01:05 PM
I agree, calculate the loads including every thing that the mast holds up, each sail if working properly carries a similar load per square foot although the forestay carries some of that, it pays to be a little conservative in anything except a pue racer which has to be as close to the line as you dare.

John W


Originally posted by Ed Nye:
I have been fooling around wiht Robert tyrrell's mast design software (http://www.carlsondesign.com/#Professional_Shareware. I have a probably dumb question, but when you figure the sail size for the main mast do you use the total for headsails and main? Just the main? Or something else!

When you think about the possibilities and stress on the stick, the compression loads are greater than just the main, but not the same as with a cat rig and a larger sail?

So what do you all think?
Ed

john welsford
12-16-2002, 01:07 PM
By the way, thre is some useful stuff on mast sizing in Skenes Elements which will give you something to compare your softwares ideas with. Just remember that software is about as likely to be correct as a book or my opinion, in the end someone sat down and wrote it.
JohnW


Originally posted by Ed Nye:
I have been fooling around wiht Robert tyrrell's mast design software (http://www.carlsondesign.com/#Professional_Shareware. I have a probably dumb question, but when you figure the sail size for the main mast do you use the total for headsails and main? Just the main? Or something else!

When you think about the possibilities and stress on the stick, the compression loads are greater than just the main, but not the same as with a cat rig and a larger sail?

So what do you all think?
Ed

Ed Nye
12-16-2002, 01:51 PM
It took a couple of years, but got the answer. Is this place great or what!
Ed