A decade ago, I took my Sterling instructions to a copier service and just magnified the 2-View to the specified span. Lines are kinda wide and splochy, but you can cut parts from them. The instructions give all you need about structure. Ribs are straight tapered and the leading-edge and trailing edge stock help determine the successive sections, starting at the root. Without rib templates, you wouldn't come out "perfectly," but I think that you could draw up root and adequate tip sections and sand a set the old-fashioned way. Profili II would give you print outs of all ribs, if you input root and tip coordinates (remembering to remove the 1/16" edges for center planking, when you cut the ribs).
The plane should fly comparably with and without movable flaps, since it is short-coupled, and the flat stationary flaps do increase the section's performance marginally over a flapless profile anyway. I built the kit stock (with movable flaps) in about 1960. It flew nicely. As a kid with good reflexes and no idea of "the" stunt pattern, I used to fly it with a $5.98 McCoy .35, leaned out, on 52' lines, and did a few successful "white-knuckle" verticle lazy eights with the outside loops at the bottom. Unfortunately, the 2-3 unsuccessful 8's reduced it to pieces too small to re-use. But I loved that plane.
Topic: Need plans for Sterling YAK 9. (Read 2208 times)
