safetypee
My hearing must be better than I thought it was, or your's is worse than you realise.
Whilst I agree that the howl is louder the faster the airspeed when the flaps travel between 0 and 18 degrees or vice versa, even at Vfto the noise is still very noticeable.
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Re:
The different flap extension speeds are predominantly governed by aircraft variant (Max wt), but particularly by max zero fuel wt. Note that for the very heavy wt 146-300 / RJ100 aircraft the Min Man - Vfe gap closes quickly.
Why does the max zero fuel weight have a bearing on the maximum speed for extension of flap 18? With regards to Max Wt, I understand that a heavier 300 as compared to a 100 or 200 will need a higher Vfto, but I don't understand how this affects the maximum speed for Flap 18?