The picture shown in the FAA explanation makes no sense to me.
To look at the rotational direction, it shows pressure increasing at the bottom and decreasing at the top, hence a resulting up force.
Should this not be the other way around because, the way I understand it,
the cylinder part rotating into the wind creates an increase of the relative airflow speed (pressure drop) over the surface (in the illustration; at the bottom) and the top shows relative airflow slowed down (pressure increase) accross the surface.
Are there effects causing my understanding not to be true ?
Just curious, because aerodynamics have served me well in my 60 years of flying.
