Calculating forestay length

[marina95]

For masthead:-

Square root of I squared + J squared

For 7/8 fractional:-

Square root of (I *.875) squared + J squared

Am I going wrong somewhere?

Alternatively if someone has the definitive forestay lengths for a GK29 masthead rig (known as the family racer) and the fractional (known as the half-tonner), I'd appreciate it!


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[tugboat]

Am I missing something here? Why calculate when you can measure? Pull the end of a cloth tape up with a halyard (binocs to make sure the end is in the right place) or pull up a line, mark it and measure it at deck level. Think this must be a 'racing thing'? /forums/images/icons/frown.gif

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[marina95]

Yes, boat is in Greece need to know before I go back to the boat the measurement!<P ID="edit"><FONT SIZE=-1>Edited by gk29 on 26/09/2004 18:29 (server time).</FONT></P>

 

[davidbuttriss]

I am sure Peter Sanders at Sanders Sails in Lymington would know, give him a call and ask. He is an oracle with regard rigging and sail making.

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[stevebrassett]

I doubt it. On my boat certainly, the mast is on the coachroof, and so is above the
forestay fitting, and therefore I do not have a right angled triangle.

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[marina95]

Steve, Thanks! Knew there was something! I'll be calling Sanders tomorrow to see if they have records...

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