ORIGINAL: red head
I've heard simular sounds that I know aren't control flutter and usually just a slight change in RPM changes the sound. You might try a different prop or 2 and see if that makes a difference. Also if I remember right that plane has " cheek plates " on the front of the fuse , if they aren't really solid they can make funny noises when they vibrate at certain speeds. ENJOY !!! RED
ORIGINAL: Gray Beard
When I hear strange new noises as my planes fly by I land and check everything out. So far it has always been something like a loose wheel, cowl,
canopy hatch. Just little stuff. If you think you are having a control flutter then find the speed and do a close and slow fly by whit friends watching the controls, you can usually see the controls fluttering or the plane is reacting strange. Flutter is USUALLY found at the higher speeds. I have seen it so bad the controls were flapping at all speeds. If you have flutter it will strip out the gears in your servo pretty fast, not a good thing.
That's just it. Like I said, I checked for flutter, I tried different props (read original post). So far, what's making sense, is the midrange vibe or wheels or covering. Especially the wheels/covering theory because the only time it happens is when the plane is in flight. Hmm, might have to try somethin with the wheels...
Thanks all!