Originally Posted by PHerder

There was a flyer with an ~ 1 year old Apprentice that has experienced 4 crashes, last one was two days ago. This time the plane went into a spin and must had flatten out before hit since it was just sitting in the field where we recovered it. Propeller wasn't even broken. When I got to the plane, the propeller was wrapped with grass and there was a beeping I am guessing from the ESC since the motor was trying to spin still and I could feel that the motor was extremely hot. I turned off the plane (receiver switch) but did not disconnect the battery. When we got the plane back to the flying field, everything EXCEPT the motor worked so voltage was getting thru the ESC to the receiver but the motor would not spin. Don't know what failed there but if the ESC had failed, then that would explain no control. We disconnected the battery since I think it was still powering the motor since the motor was not cooling off. The battery cell voltages were all within a tenth of each other and consistent with the flight time use.

As I stated to begin this, the user has had 4 crashes. Only one was sort of explained due to a battery cell going bad. The rest do not have a root cause. I expect that either the ESC is intermittently not supplying power to the receiver or the receiver is intermitted.

What I am afraid of is the user will find that the motor is dead, he will replace it and continue to fly and have more crashes due to the ESC or receiver.