If we look at an example were the relative wind from the front of the aircraft at 50kts, which would be that case when hovering in a 50kt wind or when when flying at 50kts airspeed, the rotor system draws no distinction between these cases.
As the blade leaves a position over the tail, and ALL the way around the advancing side its relative airspeed is increasing. Its highest relative airspeed is at the 3o'clock position, and this is where the most lift will be produced, and the greatest RATE of flap. It is important to realise, that on the whole of the advancing side the lift force is greater that than in the hover and and the blade is flapping up throughout the whole of the time it is on the advancing side. The maximum flap is achieved at a position over the nose, where the lift returns to the hover value, and the RATE of flap reduces to zero.
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On the retreating side the opposite is happening, as we leave a position over the nose, the relative airspeed is decreasing. The lowest relative airspeed is seen at the 9 o'clock position and the lift force produced here is the lowest. This implies as in the previous example maximum rate of flap (down in this case). The minimum flap is achieved over the tail of the aircraft, where the rate of flap once again reduces to zero.
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