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Old 16th April 2006 | 13:22
  #52 (permalink)  
HappyJack260
 
Joined: Oct 2005
Posts: 122
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From: Sydney, Australia
Originally Posted by Dan Winterland
Interesting! So a stall will always occur at the same stick position if the weight and balance is the same. So what about loading then? The speed at which a stall will occur is more relevant - and this speed will change at the square root of the load factor. At 1g, if the stalling speed of an aircraft is 60 knots, at 2g, it will be 60 x 1.4 = 84 knots, at 4g it will be 60 x 2 = 120 knots. At 0g, the aircraft will not stall. I suggest that in each of these cases the stick position will be very different.
As for 'walking the rudder' in a stall, enough has been mentioned here for me to not go into why this is not sensible.
I hope you're not teaching your students this nonsense - assuming you're an instructor. Which I hope you're not!
Neither loading nor speed will change the stick position required to get a stall. In recovering from a stall, speed of recovery is a good thing. You can move the stick quicker than you can change your speed.

And if you put the stick into a position where you are not stalled, chnaging speed or g loading won't make you stall. If you move the stick and thus stall the aircraft, changing the speed or the loading won't unstall it, either.

I've also explained that "walking the rudder" can allow you to keep the aircraft level in a deep stall. I didn't suggest that keeping the aircraft in a deep stall was a good idea.

No, I'm not an instructor. I have found that many instructors are ignorant on this point though. I myself learned this relatively recently from a couple of highly experienced instructors, both of whom teach aerobatics and therefore get to explore aircraft behaviour across a wider range of attitudes than many pilots usually experience. I didn't believe it until I climbed into an aerobatic aircraft and checked this explanation out for myself across a wide range of speeds, loadings, pitch and bank angles. I found it holds good.

You might like to get off your keyboard and into the cockpit if you want to check this out, too. Or have your prejudices overcome your willingness to learn from experience?
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