Sample from "Illustrated Sail & Rig Tuning" from Dedekam Design
 
When you tighten the sheet:

- The sail's angle to the centreline decreases.
- The twist of the sail usually decreases.
- The depth of the sail decreases.

In order to  decide  how  much  to haul in  the sheet you may use the distance between the spreader and the sailcloth  as a measure.

Some refer to a number of   "fists",  others to tape reference stripes  on  the spreader (=crosstree).The  best  positions  differ from boat to boat  but  in optimum conditions, with medium winds and smooth seas,  you  may on  many boats sheet your genoa in until  it  just touches the spreader and thus be able to point higher. If you want speed rather than the ability to  point high,  you  can ease  the sheet further away from the spreader. This  will  be  especially helpful in very  light  airs. 

Find  the  best  position  to  suit your boat by employing trial and error.
 
 
 
 



 
 
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