I used the stock main gear with taller 2.5" foam wheels and bent the gear in slightly for a little more clearance. 3" wheels would probably work better. The APC 14x4W is a 3D prop and it produces gobs of thrust and will help keep the speed down. I've had mine for about a year and a half with well over 100 flights on it and never had a single problem. I had the US 60 (sold it to my brother) and in my opinion the 40 flies just as good if not better.

WCB