Sail technology and trim. Nick Turney North Sails. Nick Turney. Sail Maker for 10 years Professional Sailor TP 52 Farr 40 RP 65 Cookson 50 Professional Coach Farr 40 TP 52 One Design . Sail Technology. Rig Profile. Using measurements from your boat. Sail Sizing.
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Using measurements from your boat
We use the rig profile to design sails that best fit the rig
Horizontal and vertical curvatures
Puts a yarn or panel layout on a design surface
Pressure map for the sail plan
The fore and aft relation of center of effort to center of resistance creates helm, weather or lee
More rake increases weather helm, less rake decreases it.
Oversheeting the mainsheet will close the leech, increasing weather helm and making the bow want to point up
Easing the mainsheet opens the leech and decrease weather helm, making the boat easier to sail straight
Adjust to keep helm Neutral
Up in light air
Down in heavy air
Draft forward is a better heavy air shape, keeping the leech more open to depower
Draft aft is a better light air shape, firming the leech for power
the lower main fuller
for more power
lower main and opens