Flutter is a self-feeding and potentially destructive vibration where aerodynamic forces on an object couple with a structure's natural mode of vibration to produce rapid periodic motion.
Flutter
Rapid oscillation of a wing or control surface. Usually appears only at high speed and is often caused by excessive gaps between wing and control surface, or by inadequately stiff control rods, ...
Flutter A phenomenon whereby the elevator or aileron control surface begins to oscillate violently in flight. This can sometimes cause the surface to break away from the aircraft and cause a crash.
Flutter. Usually applied to wings or ailerons - the unstable oscillation caused by interaction between aerodynamic forces, elastic reactions in the structure and the force of inertia. Unless damped quickly flutter will break a wing.
FLUTTER - Unstable oscillation of an airfoil surface.
FLYING-BOAT - A heavier-than-air craft which is supported on the water by its water-tight fuselage.
"Flutter (aeronautics) - An aeroelastic self-excited vibration with a sustained or divergent amplitude, which occurs when a structure is placed in a flow of sufficiently high velocity. Flutter is an instability that can be extremely violent.
25: Fluttering Card — Lift Created by Circulation
Also, it is easier than you might think to demonstrate this important concept. You don't need four vanes on the rotating paddle; a single flat surface will do. A business card works fairly well.
From the beginning fatal crashes, caused by wing failure, occurred, and extra bracing wires were added to remedy wing flutter.
With my left hand on the ignition key attempting to restart on the way down, the engine only fluttered and sputtered a few times.
Check the trim tab and rudder hinges for any flutter (less is better), take a good look at rudder stops and rudder cables.
Today, with the knowledge accumulated for over a century on aerodynamics, structural strength, on their relation in aerolasticity (flutter), on ergonomics and with the ongoing development of modern, efficient, reliable and lightweight engines, ...
"I went to Rockford sometime around 1960 and fell in love with Ray Stit's Flutter Bug. He had a way of doing things simple and strong and that appealed to me, so I bought a set of plans and started building. The airplane is still flying today." ...
"We've done that for 30 years," said Marilyn Collett who runs the FBO with her husband, John. The candy bags are labeled "Nectar Kits" (a butterfly reference); business cards carry this slogan: "Don't flutter by; stop at Butterfly." ...
 See also: Aircraft, Flight, Speed, Pilot, Plane
  
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