"Most of noise is generated by motors "clicking", The Simonk reflashed ESC reduce the noise a lot  ;)   Ciao   Josè"

"I'm full agree with your analisys. This is a problem difficult to solve on a multirotor because we have quite no opportunity to put a vent port in a good position to handle flying conditions (or lateral wind gusts). The  pressure reading…"

"Hi, john, I think that you are right, and the problem may difficult to solve in multirotor. I'm studiing this from same weeks and seem that the pressure envelope during dynamic fligth is complex.   In my experience I found the pressure can…"

"Right, Every quad would pass "tennis ball test" during manouver in acro mode at least in the absence of significant aerodynamic effects. But when I saw this tread I realized that tennis ball :) would be usefull to verify how my custon…"

"works the same way a waiter with a tray of champagne glasses, This is my JJ-copter (modded Aeroquad) doing "Tennis Ball Test": JJ-copter Tennis Ball Test   Ciao"