On my sails is printed the rigging specifications. When it refers to "Luff" does that mean mast length including the necessary extension and when it says "mast" that just means the recommended mast length? cheers
I have found with my extendable sails that the measurement appears to be to the top the the sail and does not include the added depth of the cup (about 2.5-3cm). Not sure if that is correct, but is an observation.
