[kpao]

What do you mean engine stall?

As long are you have enough thrust, airspeed and no system preventing you to go above a certain pitch or AOA, then the plane should fly just fine...

[JorgeGT]

Excessive AOA causes streamline detachments in the diffuser that cause compressor stall: http://www.free-online-private-pilot-ground-school.com/image...

[kpao]

Right, but there's no excessive AOA here... except during recovery maybe but I doubt they let it go that high...

[droithomme]

Please state clearly and plainly that it is your assertion, as a claimed expert pilot and aerospace engineer, that a stock 787 as shown has enough thrust to achieve vertical flight, as you are strongly implying in your comment. Thank you.

[overcast]

I mean the engine stalls, from lack of thrust, and airspeed. A 787 has about a 1:2 thrust to weight ratio. It's not a fighter jet.