Sample from "Illustrated Sail & Rig Tuning" from Dedekam Design
 
The genoa has got too much twist when:
- The sail luffs first in the upper part.
- The top windward telltale flutters first.

If the sail luffs first in the lower part the genoa has too little twist.  The  bottom windward telltale will flutter first when heading up. The traveller must now be moved further aft. This will reduce the downward tension in the sheet. The clew  will lift  and the top of  the genoa will  fall off to leeward. At  the  same time  the sail will  be flattened in the lower part due to  an  increase  in  the horizontal pull of the sheet
 
 
 



 
 
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