I took my Aeroworks Extra 260 equipped with this engine today for the first flight. Right before take off I was getting 10000 rpm with the Xoar 14x6. It pulls the plane with no problems without using full throttle. It is a sweet combo. The engine has plenty of power and I'm starting to love it. I'm going to try a Xoar 15x6 the next weekend, I'd like more pull and less speed for the aerobatics. This is definitely the way to go.