Hi to the UCD 40 group. I have had mine in the air now for about 4 weeks, and am thrilled with the perfomance. the ability to go soooo slow. And I am getting closer and closer to houvering. But a question. My plane seems to have a harmonic noise. It gets louder and quieter at differend throttle settings. Any suggestions as to how to fix or lessen that problem? I am using the Saito 82, and a 14 x 4 prop, and 15% cool power at sea level. Any suggestions would be most appreciated. Jim Tucker, Clearwater Florida.