Well, A good start in my mind, would be if there are no noise ordinances in your respective area, would be to present your borough or township with EPA or FTA sound level standards for areas equivalent to the area your are flying and let them know you are modifying your aircraft to those standards. At the very least it would show the community that your club is earnest in it's attempt to be a solution rather than a problem to the situation involved. Possibly when the one or two who complain to the community council or whoever, your club might be looked at in a more favorable light.