regarding the noise thing,.. they're generally quiet (can't even hear them) in the air, but the noise check I'm told is over hardtop, and the 22X12 prop is a lot closer to the ground than the usual 17~18 inch props. I was told there was a 1db difference just from raising the tailwheel so the plane was in level flight mode just sitting on the mains, versus having the tailwheel on the ground (prop tips closer to the hardtop). anytime you get a prop close to something it gets loud,..as evidenced by all the little foamie zagis with the prop very close to the trailing edge. I have a hard time flying my larger electrics when there are .46 powered glow planes in the air, as I can't hear anything. It's really amazing how much you rely on the sound for throttle control