Originally Posted by
tdracer
The 787 has an interesting issue with engine out - at lower airspeeds they have to limit the thrust of the 'good' engine to insure there is adequate vertical tail/rudder authority to maintain directional control.
Understand that having the smallest vertical tail is good for lower drag but this is quite a trade off
Not scientific at all but all you have to do is look at a 747s vertical fin to know it’s more than enough
The 777 and 787 fin always looked too small and out of proportion, the A350 even more so