Hi Ryan,
I checked out the video, those blades are really moving along.
However I could not hear the sound for some reason..probably something I'm doing wrong on my end...groan.
Yet with my blades being that thick on the trailing edge and when it hit 50 amps a time or two, It didnt get very loud.
I remember when my 11 footer would drive out some RPM's it would get noisy...much more than the 17 footer. Iit would almost have a whistle to it.
I'm far less knowlegable than most folks who haunt this site, but at what rpm does the generator cut in ?..Im leaning towards RPM's, in that video those blades are really moving on