(TET would love you to explain how Mr coriolis manages a slight rise - the coning effect and CAV will be massively opposed by rotor drag)
easy, get a piece of string with a weight on the end of it. swing it around in a circle at a constant speed, then shorten the string a little and see how it speeds up.
same as the diameter of a coning set of blades reduces.
Mr C talks about all those fangled things like - cetrifugal forces - and - sum total of masses and energy -, but really the bit of string is easy to demonstrate and happens well before any extra drag shows up.
one more red please.
tet.