That makes sense. It opens up the slot between the main and jib, allowing more air to go through without backwinding the main. You might also want to use them upwind in heavier air, if the main is getting too much backwind and you don't have a smaller jib to switch to right away. Some new boats are being set up without any tracks for jib leads. They use sets of barber-haulers attached to padeyes in the deck to place the clew of the sail wherever they want it - in/out/forward and/or back. It's lighter than a track with cars (and adjusting lines) and probably less expensive too.Just as a suggestion, I would think you would use barber haulers on a headsail when off the breeze. .
Spinnaker pole is set up as if you were "goose winging" then gybed the main only. Then head up to fill jib/genoa and onto your course. I'm not sure how high you would be able to carry this into the breeze but he swears by it(calls it his turbo-charger). I am guessing but I think height would be dependant on fullness of sail and length of pole.I assume that the spin is mounted athwartships.
the reason i asked about the barber hauler was because of back winding main when on a beat. i suggested easy the genoa a couple of inches but that was rejected. they want everything strapped so tight. we dont practice so theres no way to see if their would be any gains in doing that. pointing vrs speed. how do you know unless you try?
thanks for the replies