RCU Forums - View Single Post - Skymaster Viper ..... unexplained crash??
Old 07-10-2010 | 01:27 PM
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highhorse
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Default RE: Skymaster Viper ..... unexplained crash??


ORIGINAL: SinCityJets


ORIGINAL: RCFlyerDan

Yes, it is called an accelerated stall!

Accellerated Stall - The accelerated stall usually surprises a pilot because it occurs at a higher airspeed than a normal stall (in which a wing loading of 1 G is maintained). Remember, a wing can be made to stall at any speed—all that has to happen is for the angle of attack to get high enough. As G-loading increases, so does stall speed. If a wing reaches its critical angle of attack when the wing loading is 2 G, twice normal, the stall will occur at a speed that’s proportional to the square root of the wing loading. The square root of 2 is approximately 1.41, so the stalling speed at 2 G will be 1.41 times what it would be under 1 G conditions. Accelerated stalls are often caused by abrupt or excessive control inputs made during steep turns or pull-ups. If you’re in a dive and pull back with enough suddenness and force to load the airplane to a typical design load factor of 3.8 G’s, you’ll enter an accelerated stall if the airspeed drops below 1.95 times the stall speed at 1 G loading (the square root of 3.8 is approximately 1.95).
That's a great explanation of it!
That's a great explanation of accelertated stalls, yes. But that's where it ends, IMO.