Another example would be rapid descents: the aircraft can become quite unstable when it gets into its own downwash. (A high control frequency makes all the dif

Another example would be rapid descents: the aircraft can become quite unstable when it gets into its own downwash. (A high control frequency makes all the difference here for quadcopters. Compare a toy and a hobby quadcopter, it's easy to spot the difference.) Also, lift generated due to the top and bottom of airfoils can be quite different.