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 Catalina/Capri 25/250 Sailor's Forums
 General Sailing Forum
 Measuring a headsail		  New Topic  Topic Locked
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John Russell
Master Marine Consultant

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USA
3444 Posts
Initially Posted - 10/31/2008 :  13:24:32  Show Profile
Rather than continue the hijack of a swaap meet thread......

This is copied directly from the [url="http://www.rollytasker.co.uk/order.htm"]Rolly Tasker website[/url] section on sail measurement.
LP explained
A great deal of confusion exists as to the meaning of the percentage number of a Genoa or smaller headsail. For instance a sail may be described as a 150% Genoa. Your headsail size is defined by another dimension called the LP (luff perpendicular). <b>Luff perpendicular is measured as the distance from the clew to the luff at an angle of 90 deg. to the luff. </b> This distance divided by "J" * 100 is the percentage size. A Catalina 27 with a standard rig has a J measurement of 11.25 ft. A 150% genoa for this boat would have a LP measurement of 11.25 * 150/100 = 16.875 ft. A 100% sail would have an LP of 11.25 feet.
John Russell
1999 C250 SR/WK #410
Bay Village, Ohio
Sailing Lake Erie
Don't Postpone Joy!
Edited by - on

Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts
Response Posted - 10/31/2008 :  22:17:51  Show Profile
Note that "J" is the length from the base of the forestay to the base of the mast <i>at the level of the deck</i>, as if there was no cabin trunk.

Another aspect of sail measurement is the height of the clew. A "deck sweeper" (racing sail) and a cruising sail with a higher clew for visibility, with the same foot lengths, will have slightly different LPs. A large cruising genoa cut as 150% LP, and racing sails cut as 155, will have a clew about the same distance aft on the boat. Similarly, 130 versus 135 is likely to be a function of the height of the clew. (I had a 130--a slightly higher cruising clew.)
Edited by - Dave Bristle on 10/31/2008 22:20:41
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.