Vmc
I’ve read up on propeller efficiency loss at altitude, there seems a lack of readily available information on this. As a matter of curiosity I would like know what percentage of loss occurs from sea level to FL200 for a constant speed propeller. In my previous article I mentioned wings being affected by DA, I should have said airfoils, which includes the rudder. Meaning that all airfoils are affected by less wind crossing their surfaces and eventually control is lost.
This is all a moot point, because we are talking about controllability at the edges of the envelope. To know which force will cause the Vmc roll is hardly necessary; is it the lack of rudder, the roll from loss of aileron control, the torque of the engine or a concert of forces working together to kill the pilot and passengers.
The best practice, and that which we have all been taught, is to avoid these death traps with prudence and good piloting skills.
This has been an enjoyable but somber rant.
Adieu