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Old April 9th 06, 12:25 AM posted to rec.aviation.piloting
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Default Why are (some) delta wings stable without a horizontal tail?


"xerj" wrote in message
...
Thanks Dudley.

Make sense now.

No sweat. Darrell hit on some of the operational issues for you. Also in
fighters like the 106 and the Mirage, you could grab a yard of stick above
corner, rotate the lift vector, and bleed the Ps down with the drag curve so
fast that overshoot became a real issue for a shooter sitting on a tracking
solution.
It was Lippitsch I think who pioneered the delta without a tail. The idea
was popular for a while, but the extremely high landing speeds made handling
the airplane a real challenge. The whole deal centered around the trailing
edge design. Putting the horizontal stab back on the airplane (Mig 21/blown
flaps etc) helped the low speed/angle of attack situation on landings, but
the delta remains even today as a huge induced drag machine into the left
side of the envelope.
Power control and front side/back side power curve issues on final are still
major areas of concern for the deltas.
Darrell knows......that arrowhead of an airplane he flew was one hell of a
piece of equipment :-))
Dudley Henriques