I had an Air X and was happy. Yes, it was noisy. After weathering Ike, I contacted the manufacturer and learned you can upgrade the AirX to the newer whisper. They sent me everything except the tail casing and stater to upgrade the unit. The difference was fantastic! When I first fired the upgraded unit up, I thought there was a malfuntion because of the difference in noise
level. Does it make noise
, yes. Is it louder than the wind in the rigging
? NO. It makes a very hard to hear whooshing sound. It starts charging
as about 6 to 7 MPH winds and no longer does that stall growl when the wind gets to more than 30. If you have an Air X, the upgrade package is about $300. It comes with new blades, hub, rotor and controller. It is a remarkable difference.
Now the down side, I had the Air X version long enough to judge the wind speed by the noise it made. Now I have to relearn to estimate the wind using a different method. I guess I can live with that.