3510H motor apparent problem

James Cole · Jan 4, 2016

Hello Guys...

Two weeks ago I purchased an Inspire V2.0 and in one of my flight checks I noticed that three of the four motors move up and down when pulled... Can you check for me if your 3510 or 3510H do the same?

Please see the video, the first motor is Ok.

Is this something I should worry about?

Thanks!
JC

James Cole · Jan 4, 2016

Hey guys anybody had a chance to check their Inspires?

The Editor · Jan 5, 2016

James Cole said:
Hello Guys...

Two weeks ago I purchased an Inspire V2.0 and in one of my flight checks I noticed that three of the four motors move up and down when pulled... Can you check for me if your 3510 or 3510H do the same?

Please see the video, the first motor is Ok.

Is this something I should worry about?

Thanks!
JC

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The same answer you got on the DJI forum - Normal, stop worrying about it and go fly.

James Cole · Jan 5, 2016

Thanks for the responses guys, if its not too much trouble I would like to confirm with someone that pulls on the motors and checks this... You only have to pull slightly to notice this "feature" dont yank it!

James Cole · Jan 5, 2016

Let me know guys! just check your inspires real quick!

Thanks in advance!
JC

Air Miles · Jan 5, 2016

checked my inspire 1 v2 and motors 1,3,&4 slightly move as you have described. Not sure but Dji needs to let us know if this is NORMAL.

James Cole · Jan 5, 2016

Air Miles said:
checked my inspire 1 v2 and motors 1,3,&4 slightly move as you have described. Not sure but Dji needs to let us know if this is NORMAL.

Thanks Air... thats strange in my case looking at the inspire from the back, my right rear motor does not move... is this the same as yours?

Air Miles · Jan 5, 2016

Looking from the front motor #1 is left, motor #2 is right, motor #3 is back left and motor #4 is back right. #2 motor on the front is the only tight one. I think the editor is correct and this is normal. I will check with my friend in China who works for DJI technical services. In the past I have obtained accurate answers from Chang.

James Cole · Jan 5, 2016

Air Miles said:
Looking from the front motor #1 is left, motor #2 is right, motor #3 is back left and motor #4 is back right. #2 motor on the front is the only tight one. I think the editor is correct and this is normal. I will check with my friend in China who works for DJI technical services. In the past I have obtained accurate answers from Chang.

Yes, my only solid motor is number 3....

I believe The Editor is a pretty knowledgeable and helpful guy here but I really would like to know whats technically going on since this "slack" raises a red flag in my preflight checks.

Air Miles did your motors move as much as mine?

Air Miles · Jan 5, 2016

Very slight looseness as yours.

DronePilot · Jan 5, 2016

If you pull on those you'll go blind!

Fastrack · Jan 5, 2016

The only thing keeping the bell housing attached to the stator is a shaft with a c-clip on the bottom of the motor. If the shaft is a slightly different length to the grove where the clip is, the bell will move up and down. As long as the bell housing can not be pulled off I wouldn't worry too much.

A tractor or ccw prop is of course always trying to pull the bell housing off, so I'd keep an eye on those motors.

Ben

Air Miles · Jan 6, 2016

After checking with DJI I was told that tolerances are close but a slight movement is normal. My phantom with Tiger motors also exhibit the same slight movement up and down.

James Cole · Jan 6, 2016

Air Miles said:
After checking with DJI I was told that tolerances are close but a slight movement is normal. My phantom with Tiger motors also exhibit the same slight movement up and down.

Air, I am very grateful for this, so its normal then probably some shafts are longer than others, well that takes care of that, happy flying!

Air Miles · Jan 12, 2016

I don't think the shafts are longer I think it is the little brass clip washer that may give a little. I checked with Jesse at Atlanta Hobby and he said it was ok for a very little movement up and down. He said to check for noise and any horizontal movement. This should not move side to side and should be tight. If it is not tight there will be an eventual bearing problem.

FlyHighUSA · Jan 12, 2016

This is a normal movement for the motors, I have had several customers call and check on this after they receive their drones. No one has had any issue thus far! Happy Flying!!!

Air Miles · Jan 12, 2016

Thanks for confirming. We need you approved vendors jumping in to give us information You see things on a larger scale than we do.
Thanks

FlyHighUSA · Jan 12, 2016

No worries, I am glad to help. No one person knows all there is to know and the learning process never stops. I learn something each and every day. Just give me a shout if you need any help!
Thanks!
Ralph
FlyHighUSA

The Editor · Jan 13, 2016

Air Miles said:
I don't think the shafts are longer I think it is the little brass clip washer that may give a little. I checked with Jesse at Atlanta Hobby and he said it was ok for a very little movement up and down. He said to check for noise and any horizontal movement. This should not move side to side and should be tight. If it is not tight there will be an eventual bearing problem.

Correct - as I said in my post above. Some very slight movement in the shaft is normal. Whether or not a thrust washer is fitted makes no difference since the force is applied to the underside of the lower bearing irrespective, with the upper bearing ensuring no lateral movement takes place. Basically, the only thing that keeps your Inspire airborne is one tiny e-clip on the bottom of each motor!