I got a Hobbico Speed Pilot for Christmas and I'm just learning how to fly. The plane is a standard elevator/rudder plane. It has an auto shutoff switch that cuts motor (it's electric) power when the batteries run low so you can have enough power to move the servos for a safe landing. Now the plane will not stay started. You can push the start button and the motor will start but as soon as you let go off the button, the motor stops. I thought it might be low batteries but I installed a new battery pack and it still does this. The battery shows 9volt (8.4 volt 1300mah pack) with a volt/ohm meter but when the motor is running, it drops to 4.5volts. If that is not enough, now when I first start the motor, the servos start jerking wildly. The plane has taken a few hits (since it is my first plane) but it has always went back together and ran just fine until the other day. What could the problem be? Sorry this is so long.