3d-printed brushless Motor - Test max. RPM (explosion)

In this video I'm testing the maximum rotation speed of the 3d-printed brushless motor. The destruction of the motor is intended, since I need to know the safe operating range.

As precaution, I've arranged cardboard boxes around the motor in order to catch flying pieces of debris. In addition I positioned myself far away from the plane of rotation, controlling the motor with the transmitter of an RC-car.