The Tube flies well when you have enough Air between you and the ground. Idle, shut down, feather if my old memory is not too rusty. Have done 2,5K´s in it. Was also my first Command Airplane. Single Engine Service Ceiling, I hope they where not over too high terrain.
I am rather going for a 3x Mayday in that case. and be safe then sorry..... Just to add a thought to the slightly diverting discussion.