So now Hobby-Lobby is telling me that the 7.2v Batteries are to low voltage for this motor WHAT!!! the motor is Graupner: Speed 400 Motor , 7.2V Thrust 8Oz. Volts 8.4 Gearbox 2.33:1 it says it will work with 7.2V. Now he wants me to put a 10cell NiHi or 3cell LiPo with a 12X6 prop. ????? So I made a 10Xaa battery pack and it proved to be no better. I put it on the charge to top it off, will see. I don't think it's going to make any different. This is so hard. I know one thing, I am learning allot. Also costing me allot for these lessons. So I still think it's the motor, any ideas ?