I am just trying to get educated on sails. I am the new owner of a tartan 30 and new to sailing. I suspect my main is the original but not sure. I was just looking for some talk on what to look for to determine quality and age. What the weight of them are, etc... I have a main with the hull no. on them and the po said they came with the boat. He owned the boat 6 years. I flew the 100% jib and main this year. He bought a a-sail for it which I'm not sure the weight of. Also he purchsed a 160% jib which I have yet to try. I just want to be a little more up on how to determine one sail from another another and get a better idea of what I am looking at. Any help or discussion on the matter appreciated.