Quote:
Originally Posted by Crumpp
Because it did have unacceptable characteristics.
The P39 exhibited neutral stability at its most rearward CG. The stick travel was 1 inch from cruise to CL max at 1.8 pounds per G.
However, the P39 required 12.5 degrees of elevator travel to reach the stall point AND its acceleration changed in proportion to elevator angle appropriately. There were no wild fluctuations in acceleration and the pilot is able to precisely meet and hold a given acceleration.
If you look at the abrupt pull out curves, the P39 met all the requirements of the NACA standard.
It was not divergent, unlike the Spitfire.
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Yet it was the P-39 that had dangerous spin qualities, and the spitfire didn't.
07-22-2012, 04:53 PM
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