Hi mate are props loose on motors, are motors spinning free , coreless motors damage easy in a crash, it can push the shaft down in the motor so it spins but has drag on the shaft so never gets its speed up to fly right
Hi mate I think they are all the same ,not seeing the motors up close, I would not like to say get get these as I may be wrong , so get the OEM ,or if you can give me the size of the motor I will check the hubsan to see if they are the same