I have to agree with Trey BIG TIME on that one. A friend of mine had a chute made by a local sailmaker that convinced him he could do it and knew how to make a "reacher". He ended up with big piece of crap on the front of his boat. Whirlwind sails are made by Chip Buck. Incase you don't know who that is, he made sails for Hobie Cat for years. Then went to makin windsurfer sails and now back to beachcats and is AWESOME. There was a Hobie 20 at Steeple Chase with a nice square top by him. Did I mention NICE? It looked better than the class sail that was on the boat I was on. You can't beat his prices either.
Lee/Team Chums