What size sail do I have? - SailNet Community
 
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post #1 of 7 Old 08-16-2013 Thread Starter
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What size sail do I have?

Not sure if I can get an answer but I am new to the boat and it came with a large genoa ( 155 or 160 or something) It also has its original size(?) sail which I believe is what? a 100 or 110? Dont ask me. There is a sail in a no. 3 jib bag. The sail measures about 9 feet on the foot and about 21 feet on the luff. The sails are for a Tartan 30. would that be a storm jib or what %? Can anyone educate me on this matter?
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post #2 of 7 Old 08-16-2013
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Re: What size sail do I have?

Two quick ways to figure it out:
1) Measure the LP, compare that to the J, and that tells you the percentage. You can search on those terms to find drawings that show you how to do the measurements.
2) Use sailritesails.com to bring up their measurements for sails for your boat and estimate from there.

That sail sounds likely to be a storm jib. Is it made with heavier cloth than your other sails?

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post #3 of 7 Old 08-16-2013
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Re: What size sail do I have?

According to saildata, the J measurement on a Tartan 30 is 13 feet. So a sail with a 9ft foot would be a 70%.

I looked up the definition of a storm jib, and it seems that encompasses a vast range - from 35% to 85%. I would suggest that 70 to 85% is not so much for storms, as for heavy weather (am I being overly pedantic?) I use my 83% every day in SF Bay in the summer!

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post #4 of 7 Old 08-17-2013
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Re: What size sail do I have?

LP isn't the same as the foot, so foot/J doesn't give you the percentage size. You need the LP (luff perpendicular) which is a little harder to measure.

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post #5 of 7 Old 08-17-2013 Thread Starter
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Re: What size sail do I have?

Well I'm pretty good at measuring. could you explain how to take that measurement. Ofcourse I'll yahoo it in a few but got to go. thanks for the replies so far.
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post #6 of 7 Old 08-17-2013
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Re: What size sail do I have?

i usually use the % of the foretriangle or FT as to how big it is.

Easiest is luff x LP x.5 = SA, then SA / FT = % sail.

As one can have an LP that is say 110% of the J measure, BUT, have a luff that is 75% of the forstay length, and only be say 80% of the FT area. THis might be a sail used in between a full luff and 110 LP sail and a storm jib.

Not that I am correct all the time on this, but at least this way, I know the order of which to put out the sails, or use or equal depending upon the cloth etc.

THat does not work per say with my drifter, it has an LP of around 130 and a full luff, but it is made of 3oz nylon spin cloth, so only designed for winds to 5 knots, then I go to the 155 which is heavier, but will go to 15-20 knots depending upon a few weather related issues.

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post #7 of 7 Old 08-18-2013
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Re: What size sail do I have?

Quote:
Originally Posted by abrahamx View Post
Well I'm pretty good at measuring. could you explain how to take that measurement. Ofcourse I'll yahoo it in a few but got to go. thanks for the replies so far.
Stretch the sail out & drop a perpendicular from the clew cringle to the taut luff. Thusly:



Now divide that measurement by the official J dimension of the boat (13 feet). So let's say your LP measures 7'-3"; sail 'size' would be (7.25/13.0)=56%. Then you want to consider total area -- probably around 65sqft for the dimensions you give, tho you can easily calculate it more directly. Current thinking on storm jibs seems to be 'smaller is better'; our 7300# Ballad 30 came with a 50% storm jib of 50sqft, & I'm a little leery of it for extreme conditions. It looks teensy next to the other headsails

jibs

but I bet if you were caught in 70 knots, you'd wish it was smaller. (OTOH, IOR boats were designed for a strong headsail bias, so it may be you can't balance the helm w/out a certain amount of sail area up there. & Where you fly the jib is maybe more critical than its size, too -- forestay vs. inner stay.)

Buccaneer18, Grainnia
SJ21, Diarmuid
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