Hello All,

I am planning on building a carbon wing mast for a catamaran, the section shape will be a 5% mast according to the method presented by Tom Speer in the paper:
http://www.tspeer.com/Wingmasts/teardropPaper.htm
The question I have concerns mast bend. I've read about dynamic/automatic gust response, in Frank Bethwaite's High persformance sailing and on homepages from various spar manufacturers. However none of these sources offer anything of more substance in the way of furmulae or numbers.

The taper on a a-cat mast (marström), was from a circumference of 17,5 cm to at the hounds to 14cm at the masttip. This would (with same laminate stack) result in a reduction in stiffnes to 64% of stiffnes at the hounds.

I don't know if this is at all representative, and I don't know how it scales.( I plan to have a 27sqm unarig on a 4m wide doubletrapping cat) Could anyone please give me some hints and or comments.

Regards
Patrik Elfving