I finally got control of my dizeasle engine on the Clown. The compression screw would not stay put, and held a great setting until you committed to an official flight, would then go south just after the first maneuver. Brrp-brrp-brrp at low power for the rest of the flight! AAARGHHH!!! and this at VSC, having NOT had the problem at home.
I cut the length of the screw down to the minmum and trimmed the cross bar down to just enough. That didn't do it. Same problem.
I then tried blue Locktite, and that solved the problem. Oh joy,oh rapture! That model now hauls through the whole pattern without a tremor. I am definitely a fan of this old PAW .061 Ball Bearing engine. 6x4 Rev Up prop and it is turning pretty hith rpm. I don't know just what, since it gains a lot of revs when it gets in the air. The only problem is that it takes pliers to adjust the compression. However the engine is well enough broken in that you only need to tweak it once a day, if that. It is no great problem to start the engine at the running setting.
One bummer is that sunlight seems to degrade Balsarite. There is major brown discoloration where the stuff was applied on the upper surface, but the bottom surface is perfectly clear. Wierd! Anyone else seen this?
I am not so happy with the model design. It really needs either more tail moment or larger tail surfaces. The model is twitchy, without being quite maneuverable enough. I have tried more forward CG, different control sensitivities, and just can not tune it to my (very competitive) satisfaction. Hints would be welcome!