barit1
I agree completely. Why discuss Relative wind at rest on the ramp? By definition, there is none. The Tube is created by the propellor, hence dependent upon it. The discussion is deceptive at its outset, comparing "driven" airfoils (wing) to "driving" airfoils can be problematic. Trying to create a situation in which a discussion can occur needs careful setup.
barit1, in propellor 101 it is advanced that the most efficient propellor is one with a single Blade, (Obviously counterweighted) do you remember why?
Airfoil
Aside: During runup, the Stream Tube resembles a Helix, as the incoming and soon to be thrashed air mass tries to align with each Blade to oppose its AoA. This is a Hint to my question, above