The reasons are as follows: It must be insufficient power. The reason for spinning is that your motor cannot provide the take-off speed, there is not enough lift, and the torque of the aircraft motor causes the aircraft to spin.

Secondly, your aircraft is either overweight, but this should not happen. The motor speed is not enough, which means the voltage and current are not up to the specified level. The reason may be on the aircraft's circuit board. If the aircraft model has four channels or more, just replace the four-in-one receiver. If it is a toy, it can only be scrapped and cannot be repaired at all. There are no spare parts to sell.