ON the UCD 60 size make sure to poor some 30 minute epoxy inside of the fuse on the firewall and lots in the landing gear hole and you won`t have any problems with it. Its a wonderful entry level 3d plane, it doesn`t harrier or do elevators well at all. It takes lots of tailweight and HP to make it flat spin. It`s really one of the all around smoothest slow flying airplanes of all time. Prop it wih a 16x6 and have funa Saito 125.