Hawker 800 Wing Oscillation - NSFW (language)
Why Aviation Stack Exchange recommends it
Aviation Stack Exchange users link it as a real-world example of flutter and limit cycle oscillation when asking about or explaining how the phenomenon looks and behaves.
Recommended by 0 people across 0 different months, 2013 to 2017.
What it is
A 22 second clip of apparent aileron flutter on a Hawker 800XP business jet in flight, posted by Mike Smith. The description notes it has been reported at high speed and altitude, stops when the aircraft slows or descends, and cites an FAA bulletin tracing it to worn or incorrectly installed aileron parts.
What people said
Cites xpda · 2013-12 · Aviation Stack Exchange · on “What causes aileron and elevator flutter?”
This video [this video] shows a Hawker jet with the wing fluttering up and down like it's about to break. What can cause flutter like that? Can it actually cause a wing or stabilizer failure? How can flutter be prevented? What should be done if something like this happens?
Cites DeltaLima · 2015-05 · Aviation Stack Exchange · on “What is the purpose of flutter testing?”
Flutter is a phenomenon that can occur when a structure is subjected to aerodynamic forces. It occurs not only in aircraft but also for example in buildings, power lines, road signs and bridges. Flutter is an oscillation caused by interaction of aerodynamic forces, structural elasticity and inertial effects. Perhaps the best known example of flutter is the bridge over the Tacoma Narrows ('Gallopin' Gertie') [LINK] that collapsed due to flutter in gale force winds. Flutter in aircraft causes the wings and / or stabilizers to oscillate. When the airspeed increases the energy added in each oscillation to the structure by the aerodynamic forces increases. At some speed the damping of the structu
Cites Peter Kämpf · 2017-11 · Aviation Stack Exchange · on “What is the effect of wingspan on wing stiffness?”
Limit cycle oscillation is a fancy term for flutter with constant amplitude. The limit cycle [LINK] is an attractor [LINK] , meaning that the frequencies and amplitudes of a range of oscillations will converge to the limit cycle oscillation as time progresses. One example can be witnessed in this video [this video] . By removing the wingtip, GE could raise the bending eigenfrequency [LINK] of the wing, like you make a pendulum swing faster if you shorten it. Adding a heavier engine before certainly reduced the eigenfrequency, so the shortening was a way of compensating for the changed dynamic characteristics of the modified wing-engine combination. Wingtip removal does not make the wing stiffer,