I am helping to test fly a 14A with an IO-390 and Hartzel 2 blade BA prop. We are getting a high pitch noise at 120kt that gets worse the faster we go. It has been present with wheel pants and fairings on or off. Our ANR headsets do not filter the noise; it sounds like the noise you made when as a kid you blew across a blade of grass. I have never flown with this big of a canopy before and was checking if anyone else had this effect. Thanks Much