PPRuNe Forums - View Single Post - Inverted, unloading and reducing angle of attack on Modern Jet Aircraft
Old 24th May 2017, 17:36
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markkal
 
Join Date: Nov 2006
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The concept is difficult to grasp, unless you ve been inverted a few times to develop orientation and situational awareness during the upset. And grasped the right reflex for recovery.

And just like controlling drift in a skid with a car, the proper actions are counterintuitive and must be learned.

When inverted the only way out is to push and roll towards the nearest horizon.
100% of non trained pilots will, out of fear and confusion pull whatever the upset.

We are trimmed for +1g for straight and level flight.
If for some reason we end up inverted, this trim situation alone will try and keep the trimmed attitude i.e. maintaining +1 G ending up in an inverted dive, instead of pushing forward to reach -1g and prevent the nose from dropping.

Therefore the lift vector inverted and trimmed for +1g will result in a dropping nose. Add to this the wrong instintive reflex to pull and its a killer non survivable half inverted loop that if started at cruise speed will end up at Vne and well beyond. If the aircraft miraculously does not break apart, to recover from the dive...one would need at least 4g's at normal speed.. beyond Vne, the load factor for the same amount of pull or push on the stick or yoke is proportional to the square of the speed. Double the speed, the load factor increases fourfold.

Invest in additional training, trying aerobatics, in stages, to increase your confidence, sense of orientation, smoothness at the controls, coordination...Across the whole range of attitudes and speeds.

The best investment in safety and to stay out of trouble...still 99,9 % of pilots will not do it.

Last edited by markkal; 24th May 2017 at 17:55.
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