Sample from "Illustrated Sail & Rig Tuning" from Dedekam Design
 
The genoa has got too little twist when:
- The sail luffs first in the lower part of the sail.
- The bottom windward telltale luffs first.

When the traveller is moved forwards:
- The twist in the sail decreases.
- The depth in the lower part increases.

When the traveller is moved aft:
- The twist in the sail increases.
- The depth in the lower part decreases.

NB!   It  is nearly always better to have sails that twist too much than too little. It is easier to steer the boat correctly with much twist (wider groove).
 
 
 
 



 
 
 
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