Batten Use in Mainsails
Bruce,It will definitely be worth your while to google mainsail battens and read about their purpose in shaping and supporting. Your Mac was designed with simplicity in mind, and your mainsail needs all of the help it can get, because of the lack of an adjustable outhaul, traveler, boom vang or cunningham. These controls help to shape a mainsail, and without them, your mainsail only has its cut and the battens to shape it. Basically, your battens (being partial type) help to support the roach, or that portion of your sail on its trailing edge that is aft of an imaginary line that extends from the top of your sail to the bottom aft corner. This added sail area will flutter without support, and the flutter is very disrupting to the creation of smooth airflow over the wing that your mainsail becomes when air passes over it.I am bringing this up, not to confuse you with technical terms during this start up point in your sailing carrer, but to at least aquaint you with the idea that there is a lot more to shaping your mainsail than just pulling in the main sheet. Even at this stage of your sailing skills, you have some variables in batten usage: the rigidity of the battens in your sail and how much tension is put on your battens when securing them in their pockets. Lighter airs/less wind would require less rigidity in the batten and less tension in the batten pocket. Then there is "batten poke", a negative (to smooth airflow) situation wherein your battens cause a crease in the mainsail at the forward end and disrupts smooth airflow. The battens at the head of the sail are especially critical in this regard. I have a friend who sails a Ventura 25, and in light air he inserts fiberglass fishing rod pieces in his batten pockets to avoid "batten poke". So, for your contemplation over these cold nights, consider that you need battens, you may need battens of different rigidity, and you may want to secure those battens in a manner that allows different tension to be placed on the batten end when installing them in the wing/sail. John S Boise