To Lu,
Going from a 2-blade to a 3-blade rotor will overcome some problems, but it will create others. Two that come to mind are;
1/ an reduction in the allowable load
2/ a greater possibility of ground resonance.
To Noise,
Noise comes high on the list of both threads. The following article from Rotor & Wing ~ May 2002 may be of interest to those who have not already read it.
Public Acceptance: The Noise Threshold: Is Quieter Better?