Hi, Paul. No, I didn't know that about the S-1A Ringmaster. In fact, I unfortunately cannot recall which version, 1 or 1A, I built as a kid. I was around 13 at the time, I think. I do remember wetting the silkspan with a water spray bottle and doping it on.
If you did not sheet the wing it was an S1. The S1-A was an "improved" version. Someone on another thread said that the S1-A builds lighter even with the sheeting because it has a lighter leading edge. Although I thought it was a "C" tube wing, someone mentioned it was a "D" tube so with webbing between the spars it should be more rigid. Note: This is speculation, I have never built the S1-A.
Does the leading edge wrapping back to the spar mean I have to use monokote or something like it? That came well after my time, I think... I'm assuming the "1A" is indeed the better ship to build and fly with the updates made from the original??? I think I'm remembering only one spar in the wing of the ones I built back then. Maybe not. Anyway, all comments and hints are certainly helpful and appreciated!!!
Because the changes came after the OTS cut-off date, you can not use the S1-A for Old Time Stunt at contests. The S1-A probably flies better.
Some people use the kit parts to make templates and build from copied parts. This allows you to select your own wood, and also permits you to resell the kit (less shrink wrap). It will probably devalue the kit somewhat but you could resell it and recover some of your costs. Just a thought.
Another thought. If you desire to build an S-1, it is kitted by RSM (good wood, laser cut parts, excellent kit, I'm told). A laser cut kit would still be cheaper than *bay, if you intend to build.