PPRuNe Forums - View Single Post - NTSB Recommendation re Airbus Rudder Travel Limits
Old 12th Aug 2010, 17:08
  #151 (permalink)  
bearfoil
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To me, the correct exit from "oscillation" involves not "letting go", that's counterintuitive and not recommended. The answer is to not "over control", and that is why I think the F22 Raptor youtube is the best example. The F-4 vid looks more like an overloaded wing(s).

The Raptor has (highly) powered controls, far stronger than any human's legs or hand (arm). The (test) pilot was using what he thought were correct inputs, but his powers of observation weren't in tune with elevators that can change pitch 90degrees at 350 knots in a heart beat at 35 tons. He was behind the a/c, and out of control, without a runway to stop his boneheaded stickwork, he would have been dead.

Each change in pitch the jet made, he corrected with WAY too much stabilator.

It was HIS oscillation, no one else's. That's why PILOT induced oscillation. Each one of the accompanying videos on the you tube link has a different explanation, float, bounce, etc.

Aircraft Coupled/Pilot terminology looks like PC newspeak for situations that went by many different names in the past, and doesn't really do the endeavour much good.

Please don't "Let go of the controls".

Last edited by bearfoil; 12th Aug 2010 at 17:19. Reason: spelling