All of your airplanes must be quieter than mine. With the engine at full throttle and all of the air noise from going 170 knots i cannot hear any change in noise level whether they are open or closed. Of course I do wear my Zulu headset.
Dues overpaid December 20, 2017
RV12 Southern Arizona Teen Aviation: wings, empennage & tail cone completed. Fuselage 70% complete
RV10 flying since July 2014- 475hours as of May 2018
RV6A purchased and flying