Hi Spin Dizzy<
Just to drag this out a little further. Hey, we have sharks in our
ocean!
An important factor is overlooked. The water (air) is NOT moving.
the hand or craft is moving thru calm air.
I assume you are discussing the advancing blade and /or retreating blade.
Also inferring that articulation changes angle of attack.
Paramount is that the angle of attack of EVERYTHING relates to
the line of flight which is a constant.
Considering a blade-wing whose neutral point in it;s articulation
range is say 4 deg. At that point a similarity would be a flat airplane wing. If the blade-wing articulates up or down a comparison would be the wing with either dihedral or anhedral.
We know the dihedraled or anhedaled wing mounted ths same
as a flat wing will have identical angle of attack, Because the tips
are higher or lower has no relavince to angle of attack.
All portions of a craft are relative to the line of flight and they
have no way of changing once set.
With a rotor the same is true. The advancing blade is set at one
AofA and the retreating is at another angle. But rhose are "fixed"
angles, they do not change.
Also consider what lifts a Gyro.
There are revolving blades which create lift. The lift which they
create is finalized as the rotor disc. Thus it is the disc which lifts
the craft and it is what should be considered in all respects.
What makes flight so very interesting is that as many study the
hows and whys the reasons visuallized can vary and usually the
very differences have merit.
If it was not, flight would be like a cup of soup?
Have fun!

Hal deBolt