If you're finding stuff like that, there might be more around that's actually in use. Ask at the local hobby shop if any customers buy C/L stuff regularly. Most of the guys I fly with (R/C at 3 different clubs) have no idea there is an active bunch of C/L flyers around here. And that includes some of the guys who fly at the park that has a couple of circles tucked over in the corner.

You'd be surprised.

Fix up that Ringmaster and find some lines. You'd also be surprised and maybe even a bit pleased to go around in circles again. When you get dizzy, just do a lazy 8 or two.