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Old 09-17-2003 | 11:30 AM
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Johng
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From: Deland, FL
Default RE: CG and Stall Speed

ORIGINAL: WildManMisfit

I have some experience in full scale aerobatics. When I am by myself in an extra 300 and try to pull 6 g's at 130 kts it is no problem. When I throw a 250 lb pound guy up front and do the same thing I get an accelerated stall, regardless of the attitude of flight. This is why I need to add some speed to some manuvers to prevent accelertated stall problems.

Your thoughts....
That example has more to do with the fact that wing loading is up by what, 15-20%?, than it does with CG position.

Now, pull up into a 45 degree climb and neutralize the controls, idle throttle. At some point you will hit the apex of the climb, and it can easily be at a speed that is below the 1g stall speed, yet the wing hasn't stalled - lets say 30 kts. Now apply full up elevator. Wing stall at 30 kts. Same for any CG position. Essentially it's the same for the vertical dive where speed is above 1g stall speed. As long as you keep to certain assumptions about continous flight conditions at constant or near constant load factors, your speed comparisons hold. But it is not a universal fact. Speed is not a good predictor of stall.