Is My Genoa a 135 or a 150?

[Rortega46]

Is my Genoa is a 135% or a 150%?  I understand the ratio is the luff perpendicular compared to the J.  Since J is 13'6", that would indicate a LP of 18'4" or 20'5".  My question is how do I measure the LP?  Can I measure while on the boat unfurled or do I need to remove it from the furler and lay it in the grass?

[Gary Brockman]

The best way to get an accurate measurement would be to tail the sail down and measure it on the ground.

[Clay Greene]

Don't know what model of boat you have but my Mark I manual says that the foot of a tall rig 130 percent genoa is 19.25 feet and the 150 percent genoa is 21.25 feet.  Standard rig is 19.33 feet for the 130 and 21.33 for the 150. 

[Gary Brockman]

The LP for a standard rig and a tall rig is the same as they both share the same J of 13.5 feet. The foot of a sail is partly determined by how high the clew is off the deck, not just the overlap.  The higher the clew, the longer the foot, so, a 150 reacher will have a longer foot than a 150 deck sweeper.

A 130 will have a LP of 17.55 feet (13.5 x 1.3)

A 150 will have a LP of 20.25 feet (13.5 x 1.5)

[Stu Jackson]

Deck sweeper or not, LP is only ONE number

luff perpendicular

[Rortega46]

Thanks everyone for your replies.  I asked this to make sure my PHRF application is correct.  I will measure LP when it stops raining, when the sun shines again, and when the wind pipes down. 

[John Langford]

"When the wind pipes down". I was going to add in jest that the easiest way to sort out if you had a 150 up was to see if if you were out of control in a wind over 10 knots:)