I did have the wings on the plane when the engine was running... I would never run a gas engine without the wings on, LOL... The plane had wings attatched and bolted on, I checked the engine bolts to make sure everything was tight and everything was.... At full throttle the elevators, rudder and the trailing edge wing tips (both) were vibrating pretty bad... Its not a violent vibration at full throttle but rather a high frequency vibe to where you can see it vibrate and feel it and it makes your hands numb... As I throttle down the vibes go to a lower frequency where you can see and hear it vibrate more...