Point to ponder...
...in repairing it I installed a CEM 0506 cobalt motor, and used monocote to replace the hinges. Standard skin method, fully sealed upper and lower.
It turned out a LOT faster than it was with the 550 can motor, flat out level flight - flutter.
I took the easy way out - put a 550 can back in it. More than sufficient power.
I went back and cured the flutter. It was the rudder - the pull-pull cables were just the least bit loose. I had used aramid cord and it had stretched, I suppose. The rudder servo is a Hitec HS-85BB, no slop in it.
Retried the cobalt motor - plane went like the hammers, no flutter, but the can went back in. Want it for an electric twin I'm hacking.
Can't cure the flutter?
. Headed for the gutter.
Bill.