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post #11 of 16 Old 10-11-2013
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Re: C&C30MK1 Sail identification

You can calculate the exact sail size with a tape measure and some online calculators.
  • Measure all three sides of the sail.
  • Use Heron's formula to calculate the area.
  • Use the area of a triangle formula (area equals 1/2 base times height), with the area you just got from Heron's forumula and the luff as the base. Solve for height, which is your LP.
  • Divide your LP by your J and multiply by 100 for the sail size.

I think that works, anyway. I did it for my sail, which I got used, and it came out to a reasonable number: http://sailingfortuitous.com/new_plateau

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post #12 of 16 Old 10-11-2013
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Re: C&C30MK1 Sail identification

The easiest way to know exactly what the LP is:
With the sail on a relatively flat surface, measure the distance from the back corner (clew) to the shortest distance on the luff, (perpendicular to front edge). If you are using English units, divide by 13.5'. (J measurement for your boat). Then multiply by 100 for %.
The second sail you are showing is a polyester/mylar laminate of some kind which accounts for the different orientation of the seams. You probably won't want to have this sail up in strong winds.
rb

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post #13 of 16 Old 10-11-2013
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Re: C&C30MK1 Sail identification

Quote:
Originally Posted by sonosail View Post
The easiest way to know exactly what the LP is:
With the sail on a relatively flat surface, measure the distance from the back corner (clew) to the shortest distance on the luff, (perpendicular to front edge). If you are using English units, divide by 13.5'. (J measurement for your boat). Then multiply by 100 for %.
Yeah, or that if you don't need 10 decimal places of precision.

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post #14 of 16 Old 10-11-2013
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Re: C&C30MK1 Sail identification

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Originally Posted by gfh View Post
Yeah, or that if you don't need 10 decimal places of precision.
Not sure what you mean.
But my post wasn't meant as a reply to, or criticism of yours.
It didn't even see it until after I had left my own.

rb

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post #15 of 16 Old 10-11-2013
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Re: C&C30MK1 Sail identification

Yeah, I'm saying your way is way easier.

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post #16 of 16 Old 10-14-2013 Thread Starter
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Re: C&C30MK1 Sail identification

Thanks guys
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