I bought a (somewhat rundown) used Wanderlust sailing canoe. Has no rig. I have made spars and am ready to move on to sails. I am going to use a 10 mil polytarp. Planning on lacing to booms and yards. The main is 62 sq ft, mizzen only 18. Mizzen will be just flat as it mostly for balance and keeping head to wind under anchor. I am wondering how to build draft into the main. With only one panel, no broadseaming is possible. With a lot of tension on the luff and leech, those will be reinforced with a bit of hollow. I assume a bit of round on the foot and head. Any guidelines on how much and where?
Check out this page.
I had it bookmarked from when I was looking to make one. I ended up buying a sail, but I thought the instructions were pretty good.