qdmqdmqdm firstly no idea as to the answer to your questions - sorry!
secondly to all you "top guns" intent on critisising - whats the main reason you use you airspeed indicators??? that's right its to make sure you don't stall! Obviously it's somewhat important when you are DR. but essentially you are using it to make sure you don't stall in slow flight.
Now as you all patently know more about aviation than the rest of us you will be aware that Stalling occurs when an aircraft exceeds its angle of attack NOT when it reaches a certain speed, although the predictable laws of physics mean that an aircraft will be travelling at a certain speed and a certain number of revs when the angle of attack reaches it's critical point.
Surely a better way of monitoring the angle of attack, is an indicator that measures angle of attack???? Instruments are a grand back up and if you ever fly into cloud you'll realise that they are more realiable than we are if we are deprived of any of our senses. If QDM ends up inadvertantly IMC, all other things being equal he'll have a slightly better chance of surviving than you! and he's probably less of an arrogant so and so than the rest of you as well!!