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  #1  
Old 06-19-2009, 03:25 PM
mikereed mikereed is offline
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Join Date: Jun 2009
Posts: 6
Default Calculation for crossarm stays on cat

I have a 46' cat with typical forward crossarm bracing consisting of a "seagull striker" or martingale with a wire stay passing over the top and connected at the ends of the spar. The boat has been undergoing a rebuild during which the stay has disappeared. I need to replace it but do not recall the diameter of wire used.

My question; is there a calculation to determine the forces and hence wire diameter on these stays or does one just use a "rule of thumb" such as using the same diameter wire as the caps and forestay?

Thanks,
Mike
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  #2  
Old 06-21-2009, 03:55 PM
Brion Toss Brion Toss is offline
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Join Date: Jun 2005
Posts: 1,180
Default Oy

Hello,
It's all about angles, and crucial ones they are, in this case. Assume that the striker stay needs to be able to resist the full breaking strength of the forestay. This is vital. The size of the striker stay will then vary with the length of the crossbeam and the height of the striker. The wider the angle that is formed, the bigger the striker stay needs to be; it's a basic trig exercise. If you aren't familiar with the calculations involved, be sure to be in touch with someone who is. Contact our shop for a consultation if you want me to do it, but by all means do it right; that stay is keeping the mast out of the cockpit, among other things.
Fair leads,
Brion Toss
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