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Dynamic stalling of delta wing a/c (wrt MiG 21)
Hello,
I was reading on the net that the MiG-21 is a high demand no-nonsense a/c, and tends to lose control (without the warning buffets as experienced bu other a/c) quite easily (during high speed turns??). Is this a MiG-21 phenom, or do other Delta wing aircraft also have such inhernt control problems? Googling brought out the following... ********************** classic delta-wing aerodynamics problems: 1) vortex bursting 2) dynamic stall 3) falling-leaf mode" of asymmetric deep stall?? Dynamic stall is where you keep raising angle of attack really fast - and the lift keeps increasing - and then the wings stall. And stay stalled when the angle of attack comes down - past zero, down into a dive.... ************************ quote(From Wng. Cdr Suresh's article on Bharat-Rakshak Monitor): ------------------------------------------------------------------------------- It is the docility of the aircraft that not only generates a good bit of confidence but also encourages forays into exceeding the limits of the stipulated flight envelope. In air combat manoeuvres, many inexperienced pilots have got into trouble without realising it. At high angles of attack, the induced drag increases sharply and unless the angle of attack is quickly reduced, the aircraft develops a high rate of descent, which cannot be arrested with the power available (even with reheat). Added to this, there is no protest from the aircraft like severe judder, wing rocking. etc, prevalent in other types of aircraft. This gives a feeling of well-being and a number of pilots did not recognise the danger in time to take recovery action or eject ------------------------------------------------------------------------------- A search has not yielded anything on dynamic stalling and other problems of the MiG-21 other than in passing. Can anyone point me out to a source on the net, or any specific paper/book which deals with issues of Dynamic stalling of aircraft in general and delta winged a/c in particular? Have any studies been done on other Deltas (Mirage family, F-102/104) ? And what in your view will explain the aerodynamic limitations of the MiG-21? Thanks, Lars |
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