Got a couple more flights on mine today, too. I really didn't notice the drumming, but there was a slight vibration sound. May be the same thing you're talking about, but it wasn't bad at all. This thing really is easy to hover. I think I hovered for about 30 seconds and never touched the right stick. Mine pitches to the canopy pretty bad in knife edge. No mixes set up yet. Gonna play with those next time out. ? Couldn't get it to flat spin, wither. I think the CG needs to be moved back a little more.

This thing flies a lot different than my OMP edge. Not worse, not better, just different. But I think once I get it dialed in, it will be a lot of fun.