I flew the Extase from S2G with a YS91AC and that was a good power to weight ratio @6.25 lbs. I also flew my 60SuDoKhoi @8 lbs with a YS91AC. That was alright except for hot/humid days, where I had to fly out of hovers. So I installed my YS120NC in the UCanDo. I have the tank in the middle compartment of the fuse, right over the middle of the wing. All it took was to remove a little bit of fuse former. I have my throottle servo and Rx in the compartment behind the tank, the Rx battery in the fuse right in front of the single elevator servo. I have two Cirrus CS75BBCL on ailerons, two Hitec HS525BB on elevators, a Hitec HS925BBMG on rudder and a Hitec HS205BB on throttle, powered by a 5 cell 1,800mAh NiMetal battery. I flew it this Sunday with the battery over the trailing edge, and nose heavy, and it still hovered easily. I have a feeling I will end up with CG 2" behind recommended, as I did with the Extase, to really like it. These long tail moment planes don't get as nasty when tail heavy as the short tail moment funflys do ha ha.
DKjens