We are getting ready to fly our XB 70 soon. I can't wait as it is such a good looking aircraft. A while back one of the fellas had a post concerning hopping up the motor and fan in this model. I think it utilized a Turnigy motor and a more efficient fan set up. I thought I had saved the post for future reference but it's lost now. Does anyone remember the specifics for the motor and the fan. I do remember that the author said that the upgrade was well worth it. I will be looking forward to hearing the numbers. In the meantime I will keep searching for the post. Thanks gang.