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Fairlead forward: More pull on the leech, less pull on the foot –> fuller sail
Fairlead aft: Less pull on the leech, more pull on the foot –> flatter sail.
Even further aft –> Little or no pull on the leech causing the top to open and spill wind.
The geometry I showed earlier is only good enough to find a starting point, but the best fairlead position is found while sailing and watching how the sail and the boat behave. The fairlead position is adjusted again and again, depending on wind wand wave conditions of the day. Mike macNamara wrote some very good essays about it, they are on the UKWA web site somewhere.
Maybe you should put the sails flat on the a floor some day and check the geometry and sheet angle with a plank? It should give you some idea how the sheeting of the storm jib compares to your other sails.
Please note that no exact answer can be given as sails may differ in shape, depending on their age and sail maker (ideas about the perfect sail shape have changed over time). The “magic numbers” you find on the web site and with several sail makers are valid only for brand new racing Genoa’s. And even those require an adjustable fairlead.
Sailing is not an exact science. Go out and experiment. Keep a log so you can compare the effects of your trim settings. Sew one or several thin yarns through the sheets as a reference so you can log and compare your sheeting. I have used self adhesive rulers on the boom and next to my muscle box. Make notes about:
– fairlead position
– Sail used
– Kicker tension
– Outhaul tension
– Basic rig tension (without kicker and outhaul).
– Mast rake
– Spreader length and angle
– Where did the crew sit?
– Was the crew hiking out all the way?
– etc. etc.
– And moist important: Note your feelings: Did it feel faster beating/running? Was it more stable? Were you in control?
It is a lot of work but it is a good educational experience. And never be afraid to try something new. Sticking to the old never made a winner.
But the best: Have a chat with your fellow sailors in your club and ask them what they do, and look at their boats. I have not met a Wayfarer sailor yet that has secrets about their set-up, Au contrare, every sailor loves to talk about his boat and his set-up. 😉 Give him a beer and get ready for an afternoon full of free information….