Occasional whistle from p4

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During flight in a simple hover the p4 will occasionally whistle. New and only less than an hour flight time. I've seen other videos of this and have checked to see of any motor was hotter or stopped quicker than the others. But all are the same. The p4 fly's smooth. Is this whistle still OK?

Dave
 
During flight in a simple hover the p4 will occasionally whistle. New and only less than an hour flight time. I've seen other videos of this and have checked to see of any motor was hotter or stopped quicker than the others. But all are the same. The p4 fly's smooth. Is this whistle still OK?

Dave

Teach it the words and you have a hit show [emoji57]


Sent from my iPad using Tapatalk
 
Mine does it all the time, it's been like that out of the box. I've contacted DJI about it, still waiting for a reply.

Does it sound similar to this?
Whistling noise?


Sent from my iPhone using PhantomPilots mobile app
 
Just the speed controller doing its thing. Its normal and wont get worse or better
 

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