Had two flights with my u-can-do with a new prop (apc 14x4w). Had a lot of fun with it! It will do anything that I ask of it(which is not very much at the moment LOL) Take offs are a little shorter and quicker. Started doing some very easy aerobatics with it until I started getting hits on the radio. Made for some very difficult flying. But I did get the plane down in one piece. I have the prop turning around 9500rpm with the magnum 70 FS. The manual says that it is rated for 12000 rpm. Has any one else used this engine and prop combo and what rpm are they turning at? I figured I would keep it below 10000rpm on the ground. Any body have any suggestions?