Check your plans -- that sounds like an S1-A, not an S1.
(The S1-A was actually my first "big" control line ship, with a Fox 35 and all. It lived for two or three flights, until my first wingover, where it absolutely refused to pull out of the downward turn. Knowing what I know now, I suspect a bad stall -- but I don't know. At that point college hit, and I didn't fly CL for nearly two decades.)
I can't help you find a source for the leading edge, but if your building board has a nice straight clean edge on it, you should be able to slice out a 1" x 1/4" strip from sheet, rough in the angle with an xActo knife or a plane, then finish it off with a sanding bar or sandpaper wrapped around a board. Depending on your building board, backing the strip up with a straight line of pins or (much better) a good straight yardstick or straightedge or something would be a big help.
I'm pretty sure that it's not necessary to do the other half of the diamond until you have the wing built up -- at that point you'll have lots of structure to help you hold the LE, and you needed to sand it to shape anyway.
Topic: diamond shaped balsa leading edge? Where to get it? (Read 767 times)