Originally Posted by
Grenville Fortescue
Yes I agree. Even a "stopped" disc would have some small rotational movement created by the upward airflow.
Fair enough.
Stopped doesn't necessarily mean exactly 0 RRPM, although even that might be possible.
Even AAIB probably didn't mean this litteraly. But it doesn't make any appreciable difference if you arrive with 50 RRPM or 0. (<1% in Lift).