Originally Posted by
A Squared
This is true in the real world, but the downwind turn myth holds that even in a non-turbulent uniform air mass, you will lose more airspeed in a turn to downwind than you will performing the same rate turn in calm air. So, the abstraction of a uniform airmass moving relative to the ground with no relative movement or air within the parcel is correct to address the fallacy. wind gradients, shear and vertical movement only serve to muddy the waters.
I agree! Thank you for stating it so clearly.