Assertion: airfoil's angle | /r/CapableOf | compare to airflow direction
Facets:
value: rapidly
type: MANNER
Source sentences:
text: Oscillating (flapping) wings, such as those of insects like the bumblebee—may rely almost entirely on dynamic stall for lift production, provided the oscillations are fast compared to the speed of flight, and the angle of the wing changes rapidly compared to airflow direction.