[supercat]

I should clarify: I believe one-engine planes are required to be controllable if the engine quits at any time, and should be able to land as safely as would be possible on available terrain.

[Gunrunner2]

>>I believe one-engine planes are required to be controllable if the engine quits at any time<<

Not really.

Center-line thrust vs non-center-line thrust.

There are aircraft where they lose rudder authority before stalling. Also, there are some aircraft where if they lose an engine they simply don't have the power to continue takeoff. Also, there are some conditions where an aircraft is above abort speed but below continuation speed, thereby meaning they neither have the power to takeoff not runway length to abort.