Originally Posted by
scale only 4 me
This is maybe not what you want to hear, But maybe just fly slower,, not all planes are designed to go super fast,, there is a reason Q500 planes have very small control surfaces and not strip ailerons
good luck
^This^
Speed is a direct cause of flutter. What size engine do you have. Many people think you can never have enough and then wonder why their overpowered plane crashes. Many years ago I did flutter analysis at Boeing and by the time the design got around to us the only thing we could do was either limit the speed of the aircraft or increase the wing skin thus increasing it's strength. You have one servo driving two control surfaces that are large than the original design. You are not using hinges instead relying on the covering to provide an adequate hinge. I assume you still use rubber bands to hold the wing on - how many? 10?
Flutter can be a real killer of airplanes. Its primary source are the forces caused by excessive speed.