Originally Posted by Rainboe
I think it is accepted a total hydraulics failure is virtually non-survivable.
All three total hydraulic failures described had survivors...
Is the 727 centre engine thrustline at the same height as those of side engines?
And how far are the thrustlines of the inboard engines from the thrustlines of outboard engines on 747?
Looking at roll and yaw, an airplane has 2 separate systems of aerodynamic controls for those movements. Ailerons and rudder.
And then, for multiengine planes, there is asymmetric thrust. So 3 different systems to create lateral forces... Unwanted asymmetric thrust from asymmetric engine failures can be countered by aerodynamic controls. And then again, an airplane can be steered by two throttles giving controlled asymmetric thrust, with both rudders and aileron frozen, as done on DC-10 and A300.
But on a 747, there are more than two throttles. Are there any pitch effects of changing the thrust distribution between inboard and outboard engines (while keeping total thrust constant and symmetrical)?