Whining sounds

[Bobvt]

Hi all, had a little run in with a branch ,broke one prop(tabs were broken upon inspection)replaced but I'm getting a very high pitch whine out of it.She still flies fine,no errors.
Anybody with any possibilities, please share.
Thank you
Bob
PS: Rob at thunderdrones the CS 7.85 is awesome

 

[Thomas B]

If you have the old props check for one of the 3 retention clips missising. If not remove current props and check for same loose in motor housing... had this happen to me.

 

[Former Member]

Hi all, had a little run in with a branch ,broke one prop(tabs were broken upon inspection)replaced but I'm getting a very high pitch whine out of it.She still flies fine,no errors.
Anybody with any possibilities, please share.
Thank you
Bob
PS: Rob at thunderdrones the CS 7.85 is awesome

Glad youre enjoying it! They are great devices.

As @Thomas B said, you can check for broken prop hub tabs in the motors. If you have found all 3 hub tabs that were broken, then you might have a damaged motor can.

It's risky, but if you can fly the drone within a foot of you and yaw it to see which motor might be whining, then you can isolate the problem. I do it alot on drones, but just make sure it isnt windy out!

Also, you can turn each motor by hand to see which one might have more friction or resistance than the others. Lastly, I use a temp gun. If one motor is whining it will usually run hotter than the others. Normal motor temp = 108°

 

[Bobvt]

Glad youre enjoying it! They are great devices.

As @Thomas B said, you can check for broken prop hub tabs in the motors. If you have found all 3 hub tabs that were broken, then you might have a damaged motor can.

It's risky, but if you can fly the drone within a foot of you and yaw it to see which motor might be whining, then you can isolate the problem. I do it alot on drones, but just make sure it isnt windy out!

Also, you can turn each motor by hand to see which one might have more friction or resistance than the others. Lastly, I use a temp gun. If one motor is whining it will usually run hotter than the others. Normal motor temp = 108°

Thank you,I actually did check for heat,(no heat ) fingers,they all felt warm,did find the 2 broken tabs of one prop, actually flew(dumbass) yesterday after cleaning it off,it went into a big pile of leaves (soft landing), didn't notice the whine yesterday but did today.
Thanks

 

[Former Member]

Thank you,I actually did check for heat,(no heat ) fingers,they all felt warm,did find the 2 broken tabs of one prop, actually flew(dumbass) yesterday after cleaning it off,it went into a big pile of leaves (soft landing), didn't notice the whine yesterday but did today.
Thanks

Might be one of the bearings inside one of the motors are slightly off center after the crash. You might think about changing out that arm.

 

[Bobvt]

Thank you,I actually did check for heat,(no heat ) fingers,they all felt warm,did find the 2 broken tabs of one prop, actually flew(dumbass) yesterday after cleaning it off,it went into a big pile of leaves (soft landing), didn't notice the whine yesterday but did today.
Thanks

Gonna test some more tomorrow, paying close attention to which side,the best I can,and see if I can find a heat Gun,they were not hot to touch.

 

[Bobvt]

Glad youre enjoying it! They are great devices.

As @Thomas B said, you can check for broken prop hub tabs in the motors. If you have found all 3 hub tabs that were broken, then you might have a damaged motor can.

It's risky, but if you can fly the drone within a foot of you and yaw it to see which motor might be whining, then you can isolate the problem. I do it alot on drones, but just make sure it isnt windy out!

Also, you can turn each motor by hand to see which one might have more friction or resistance than the others. Lastly, I use a temp gun. If one motor is whining it will usually run hotter than the others. Normal motor temp = 108°

I did in fact turn each motor, checking for resistance or difference in sound,but everything seemed the same,oh and I blew out the motors with compressed air.How bad is this?

 

[Bobvt]

I did in fact turn each motor, checking for resistance or difference in sound,but everything seemed the same,oh and I blew out the motors with compressed air.How bad is this?

Rob,is the swap of arm and motor something I could do or is it very complicated, would I be able to purchase from you?

 

[Former Member]

Well, if the motors are all around the same temps, no resistance, no excess vibration, and the drone flies well, then you might be ok. A bearing whine will continue until the bearings wear out.

 

[Bobvt]

Rob,is the swap of arm and motor something I could do or is it very complicated, would I be able to purchase from you?

Oops forgot, this is a mavic2 zoom

 

[Former Member]

Rob,is the swap of arm and motor something I could do or is it very complicated, would I be able to purchase from you?

Arm replaement on a Mavic Pro is one of the less complicated things to do if you have the right tools. A good Torx driver, a good soldering iron, solder flux, PHoo screwdriver, and some spludgers to get the top body off.

 

[Former Member]

Oops forgot, this is a mavic2 zoom

Mavic 2 Zoom is more complicated. You have 6 wires to solder instead of 3, 3 of which are microsolders. Then you have to correctly line the rear arm key up with the middle frame to remove the arm. Then take the arm out, and install the new one.

Takes me an hour, and I have done almost 200 left and right rears already.

 

[Bobvt]

Well, if the motors are all around the same temps, no resistance, no excess vibration, and the drone flies well, then you might be ok. A bearing whine will continue until the bearings wear out.

I was looking for that type of response, they will get louder and hotter so if I check regularly I could still fly, Right?

 

[Former Member]

I was looking for that type of response, they will get louder and hotter so if I check regularly I could still fly, Right?

Right. But of course if I tell you that and the motor seizes, you didnt hear it from me. joking!

 

[Former Member]

I forgot to ask, I thought it was the rear. Is that right? If its the front, they are a little more fun to replace.

 

[Bobvt]

Right. But of course if I tell you that and the motor seizes, you didnt hear it from me. joking!

Let's guesstimate- how long, how many flights do you think I could possibly get?

 

[Bobvt]

I forgot to ask, I thought it was the rear. Is that right? If its the front, they are a little more fun to replace.

It was the starboard rear prop that broke

 

[Former Member]

Let's guesstimate- how long, how many flights do you think I could possibly get?

Cant guess, but if the whining gets worse or louder, thats a sign the motor is going to fail.

 

[Former Member]

If I were you, I would take a stab at self repair. Youre not going to make it worse, because right now its unpredictable.

 

[Former Member]

New OEM rear arms run around $50