Phantom 3 Std. Bad motor causing high pitched 'whistle' sound/ Normal?

[Squirrel!]

I think that's normal. My P3P makes that sound also, but flies fine.

It isn't normal in a good way.

 

[Olsen Petrus]

Its normal..

Sent from my D6503 using PhantomPilots mobile app

 

[Squirrel!]

Only normal for being a bad motor. Swap the bad motor and then it sounds 'normal', and that does not include the high pitched whistle noise..

 

[mikep2323]

I have same problem. Did you change the motor ?

I haven't changed anything and runs fine. Have well over 175 flights. Sometimes the whistle is there sometimes not.