Sail Area Measurement Instructions
According to International Measurement Manual 2017 article K.4 Sail Area Measurement, the WS (formerly IYRU) Sail Area Measurement Instructions apply.
With battens set in their pockets the sail shall be pegged out on a flat surface with just sufficient tension to remove waves or wrinkles from the edge rounds and to spread the sail, as far as possible, substantially flat.
Once the sail has been pegged out in this way all the required measurements shall be taken and no alterations to the tensions shall be made.
Sail corners
Tack point
Head point
Clew point
Pictures by Armelle Molard