Mainsail Purchase
I bought a new mainsail at the beginning of this year. I got a really good deal on a genoa, so I did not buy a new headsail, but I am about to get a new working jib.One of the potential problems with an aged sail is the migration of the thickest part of the foil shape towards the leech of the sail (a blown out sail). It has been suggested that you photograph your sails while in use from underneath to see this effect. The movement of this part of the sail aft will contribute to heeling, so if your SO is afraid of the angle of the boat, maybe that is a justification for buying new. Of course having the widest chord move aft has a negative effect on performance all around.The comment that the original sails were not the best quality when new, is quite correct. All of the systems on our boats are just good enough from the factory, and the systems go downhill from there. When you get your new sail, you will see how marginal the original sails were (are?). As an example, I made a mainsail cover out of Sunbrella for my OEM D mainsail, and it was a snug fit. The new mainsail won't even come close to fitting inside the old cover, there is just that much more to the modern sail. Even the batten pockets on a new sail are things of beauty, re-inforcing and adjustable tensioners make the battens in our OEMs look pretty, well, marginal.OK, now for performance changes. I noticed immediately when I first used my new mainsail that I could point higher than before. I am very aware of the performance of my boat, I have added an Idasailor rudder and daggerboard and have measured that change from the stock gear. The new mainsail increased the pointing noticably.My new sail has 4 battens, the two at the top are full length to support the extra roach, the bottom two are partial to make for easier handling. The sailmaker of the new sail attached a tell tale at each batten pocket. I know that this will sound simple, but I did not have/use telltales on the leach of my OEM mainsail. I immediately realized that I had been sheeting my original sail way too tight. Even if I still had my old mainsail, I would want to have telltales on the leach.I decided to have a loose footed mainsail, and installed a variable outhaul to allow for optimum sail shaping. I had a single row of reef points added at the height I desired. Draft stripe will also help with shaping. And the new slugs make hoisting very easy, even when not perfectly aligned with the wind. I have yet to rig the cunningham grommet and adjuster.Since you posted that you'd like to obtain every bit of performance, can I assume you mean speed and pointing ability? That is why I am getting a new working jib. I want the tighter sheeting angle on the headsail that a 100 or 105% jib will give me. Anything that gives advantage when going to weather. The original bedsheet did not respond to the basic or secondary sail shaping adjusters. The new sail will wrinkle to show what needs to be adjusted.Prior to your mainsail purchase, and prior to your measurements (don't buy a sail unless you or someone measures your boat), it would be BEST to have some new systems: boom vang, adjustable backstay, the aforementioned mainsail outhaul, traveler, possibly new halyard and this is just for the main. It might be beneficial to reset your mast rake as well. I know that this level of change and investment is not for everyone. I believe that with this kind of equipment, you can shape your new mainsail to the best advantage.By the way, I used Air Force Sails to make my new mainsail. John S Boise