Winnie,
God knows what the 'advance angle' is. Could you be thinking of 'advance ratio' (tip speed ratio)?
Lu,
It's only the delta-3 rotor, that you're concerned about, isn't it?
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A bit of trivia;
A couple of years ago, John Uptigrove, the builder of
the Mosquito , rotated the bottom (only) of the pitch links on his helicopter approximately 10 to 15-degrees. As I recall, he said that it made no discernible difference to flight.