" ... can one hear a change like that for planes with changing blade-angles ?"
I can't hear it in other simulators. As they explain, the inertia of those huge blades would prevent the engine from accelerate or decelerate fast enough (not sure if I understood your question)..
... i just ask, cause it seems to me to be not much of a case, simply cause the blade-specs (area, lenght, space between each, speeds, material (flexing)) seem off to make such air-vibration effects like a choppers main rotor - so shouldnt be as much a case at all by comparison. ( my view that is, have no propeller plane at my back-yard to try that out
( would definitely like to have
) )
As for the animation - blade-flex (just like the gliders wing-flex) are also in my mind
... but more complicated, as the angle theyre at the rotor-hub would be affecting the segment flex-angle orientation too ... but DCS has it, We need too !