STLPilot, Flew my UCD 46 today with a Mag 61 with both a 13x4 and 14x4 as well as a 12.75x3.25 the other day. conclusion: not enough power to hover. I see you are using a Mag 80 FS. Well I have a fresh Mag 91 FS.....what do I need to make it work, what tank and mounts are you using as well as prop? Pls let me know.