Headsails: Genoas & Jibs: Sample from "Illustrated Sail & Rig Tuning" from Dedekam Design
   
The shape of the genoa is determined by:
1. The fullness of the sail
2. The draft position
3. The twist of the sail.

Basic trimming variables:
4. Sheet tension
5. Sheet traveller position
6. Forestay tension
7. The luff (halyard) tension

The genoa sheet is the most used trimming   device.

The  sheet  primarily  determines the sail's  angle to  the boat's  centreline, but  also  affects sail  depth and  twist.

NB! The closer you sheet the sails to the centreline the higher the boat is able to point. Remember also that  even  if  a trim device has a main function, it also  affects  the  other factors that  determine  the shape of the sail
 
 
 
 
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