At the lowest point, the wing begins to twist back up again. This twists the wing in just the same way (but nowhere near as much) as the built-in twist of your propeller blades.This resulting torsion changes the wings angle of attack, in turn reducing the amount of lift generated, causing the wing to swing back downwards after completing its upswing. However, for many wings, due to the location of the center of pressure, this upward bending along its span is often combined with torsion. This causes the wing to flex upwards, as you would expect. When a wing hits a gust, it experiences an increase in lift. (Torsion is just a fancy word for twisting.) Here is how it works with the simplest two-dimensional case of bending/torsion flutter involving an airplane wing. For an aircraft wing, flutter may occur when the aircraft is accelerated to a speed where, when even slightly disturbed, the wings flex, and the resultant vibrations do not have sufficient damping, or are in fact intensified by inherent resonance frequencies. Flutter can involve a wing, ailerons, elevators/ruddervators and other aircraft structures. The word is flutter.įlutter occurs as a result of interactions between aerodynamic and inertial forces. There is one single unassuming word that is used to refer to it, and the first time someone new to aviation ever hears it, theyre usually surprised because of its misleadingly serene and delicate name.
So whats going on? Well, you had better slow down, because that buzz you hear could be your ailerons about to go fully into auto-flail mode.Īs amusing as that expression may sound, such an event, were it to occur to you, would quite likely provide you with your first and very last encounter. One thing is for sure the sound you hear probably isnt a stuck microphone.
You might think that one or more fasteners have come loose, perhaps on the cowling-or you might imagine a bee, wasp or some other stowaway insect as the source. Youre descending at a relatively high speed in calm air and, since there was no forecast for and little chance of turbulence, you let the airspeed climb into the yellow arc.
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