Problems with "red Colour Props"

[Dr Jon]

My I2 arrived today and in the build phase I mounted the props to check how to use the fast mounts.

I found after fitting the "red" props that if i spun the blades around the red ones made a rattling sound. After ages of investigating where the noise was coming from i found that when the quick lock was closed on the prop there was till movement in the blade. (side to side)

Called DJI and no help there...

In the end i found that by inserting a small amount of tissue paper in the depression between the blade and the raised mounting point the noise went away. This was only 2 ply tissue so only a very small gap... I the found some single sided foam tape and inserted in the place the tissue paper was so i don't have to worry loosing the paper in flight.

Problem resolved

There was no problems with the white props !!

would advise you check yours as this causes serious miss balance and could damage your motors

 

[Luff84]

The inspire 2 is an expensive bit of kit and you shouldn't have to be doing things like this, did you get it direct from DJI?

 

[Dr Jon]

The inspire 2 is an expensive bit of kit and you shouldn't have to be doing things like this, did you get it direct from DJI?

Yes I did I'm here in china and will try to resolve issue in morning, with I2 you get two sets of props and the red sets in each are just the same

 

[Titomix]

Same problem here with the white ones...

I put all the propellers, the red ones works perfect but the white ones are both stuck, I can't get off.

The DJI support don't answer.

 

[The Editor]

Here we go again - usual QR rubbish from DJI.

There seems to be some incessant need for 'Quick' everything...'Quick Mount' or 'Quick Release' or 'Quick install'.

Personally, I believe anything aviation shouldn't have the word 'Quick' associated with it.
How would you feel if you were on board a plane going on holiday with your family and the pilot announced.
"Good morning ladies and gentlemen just to let you know today we are dispensing with the usual checklist and going with the 'Quick Checklist' because we just want to get up in the air as quickly as possible - we will also be using the 'Quick Release' wheels because we just can't be bothered to affix them using a trusted method used for years and just love the idea of going airborne as fast as we can........

I digress but no, you shouldn't have to shim a prop with a piece of tissue on a $5k machine!

 

[SanCap]

Here we go again - usual QR rubbish from DJI.

There seems to be some incessant need for 'Quick' everything...'Quick Mount' or 'Quick Release' or 'Quick install'.

Personally, I believe anything aviation shouldn't have the word 'Quick' associated with it.
How would you feel if you were on board a plane going on holiday with your family and the pilot announced.
"Good morning ladies and gentlemen just to let you know today we are dispensing with the usual checklist and going with the 'Quick Checklist' because we just want to get up in the air as quickly as possible - we will also be using the 'Quick Release' wheels because we just can't be bothered to affix them using a trusted method used for years and just love the idea of going airborne as fast as we can........

I digress but no, you shouldn't have to shim a prop with a piece of tissue on a $5k machine!

I assume the props are bigger and the motors have different threads on the I2, so the old spin on props will not work?

 

[The Editor]

I assume the props are bigger and the motors have different threads on the I2, so the old spin on props will not work?

They are 3512's with a 4mm shaft but it isn't threaded from memory.

 

[Dr Jon]

Here we go again - usual QR rubbish from DJI.

There seems to be some incessant need for 'Quick' everything...'Quick Mount' or 'Quick Release' or 'Quick install'.

Personally, I believe anything aviation shouldn't have the word 'Quick' associated with it.
How would you feel if you were on board a plane going on holiday with your family and the pilot announced.
"Good morning ladies and gentlemen just to let you know today we are dispensing with the usual checklist and going with the 'Quick Checklist' because we just want to get up in the air as quickly as possible - we will also be using the 'Quick Release' wheels because we just can't be bothered to affix them using a trusted method used for years and just love the idea of going airborne as fast as we can........

I digress but no, you shouldn't have to shim a prop with a piece of tissue on a $5k machine!

There are no threads as these have quick mount fittings. The issue is simply the engineering tolerance on the props are not good. I have a friend who got his I2 same time as me. I found 100% of his props fit his and mine with no issues. My problem was replicated on his I2. We also found if you try different combinations of prop location and motor location you can get some to fit correctly (no noise) and some wont fit any location.

A simple test is to hold the end of the blade and try to flex them if you can feel any movement then give the blade a hard spin with your finger in its correct direction for the motor to turn if you get a rattle you have a bad one.

I will continue to try DJI have educated my Chinese wife with the problem so hope she can get a meaningful reply as im not 100% fluent in Mandarin.

 

[Dr Jon]

My wife spoke to DJI support we sent videos to them now Waiting for response


Sent from my iPad using InspirePilots

 

[Dr Jon]

This is a translated response from DJI

I am Jibi technical support to provide you with services.
About Inspire 2 blades manually turn voice through the Engineer is normal, non-defective.It is not recommended to return, to avoid delays you use.

Im still concerned the props are vibrating and could result in damage to the motor and of course impact on any video or photo being shot.

as mentioned before i do have a simple fix and can use this if i need.

Im encouraged to buy another set as soon as possible for the few $ involved.

 

[The Editor]

This is a translated response from DJI

I am Jibi technical support to provide you with services.
About Inspire 2 blades manually turn voice through the Engineer is normal, non-defective.It is not recommended to return, to avoid delays you use.

Im still concerned the props are vibrating and could result in damage to the motor and of course impact on any video or photo being shot.

as mentioned before i do have a simple fix and can use this if i need.

Im encouraged to buy another set as soon as possible for the few $ involved.

DJI 'support' are absolutely useless and read off a script.
I'm surprised the didn't tell you to calibrate the compass and IMU and the props will be fine! That's their usual fix.
Any vibration due to prop mounting anomolies is not right and the harmonic and inertial vibration will be transmitted through the motor mounts and into the airframe.
Not only could this transmit down to the accelerometers (given enough vibration and at the right frequency) and cause flight control issues but over time the same vibrations can induce stress fractures to the motor mounts and additionally puts stress and premature wear on the motor bearings.
DJI are bloody clueless!

 

[Dr Jon]

well for now my simple "fix" using a foam insert into the cavity on the underside of the blade dome is working fine. It does make the quick release a little difficult but once you get used to it there is no problem. And as you say "quick release " is not the answer anyway.

I don't know how many other I2 will be impacted and I'm sure I'm not the only one. Just hope new I2 users check by spinning the props manually before they fly.

I dont intend to give up on the sob story from DJI and i have informed them i will return the entire delivery (as I'm entitled to do here in China within 7 days) and reclaim my total payment.

Waiting to see what they say about that but i think they need to..

a) find out why this vibration is coming from on some props and not others.
b) replace any props that exhibit this vibration
c) be nice to customers we paid a very big amount to have it spoilt by a few pieces of plastic.

 

[Hellohogo]

Here we go again - usual QR rubbish from DJI.

There seems to be some incessant need for 'Quick' everything...'Quick Mount' or 'Quick Release' or 'Quick install'.

Personally, I believe anything aviation shouldn't have the word 'Quick' associated with it.
How would you feel if you were on board a plane going on holiday with your family and the pilot announced.
"Good morning ladies and gentlemen just to let you know today we are dispensing with the usual checklist and going with the 'Quick Checklist' because we just want to get up in the air as quickly as possible - we will also be using the 'Quick Release' wheels because we just can't be bothered to affix them using a trusted method used for years and just love the idea of going airborne as fast as we can........

I digress but no, you shouldn't have to shim a prop with a piece of tissue on a $5k machine!

More like $8000

 

[amorrison]

I had the rattling with one of my red props. It sounds like there is something wrong with the motor but it is definitely the prop. It's incredible how tiny the amount of play is to cause all that rattling. I put a small strip of black vinyl tape under the prop on the flat part that contacts the mounting shelf. No more rattling... no problem locking the prop either.


Sent from my iPad using InspirePilots

 

[Mark Taylor]

Has anyone made a video of the 'rattle' yet?

I've got mine so it is not doing it at the moment, but if nobody has done a video I may put it back the way it was and record it to send on to DJI...

 

[The Editor]

I had the rattling with one of my red props. It sounds like there is something wrong with the motor but it is definitely the prop. It's incredible how tiny the amount of play is to cause all that rattling. I put a small strip of black vinyl tape under the prop on the flat part that contacts the mounting shelf. No more rattling... no problem locking the prop either.


Sent from my iPad using InspirePilots

It's also incredible how much that play is amplified at 9,000rpm to induce chronic vibration and can affect blade tracking.
You would think that a Multirotor specialist manufacturer would get a grip on this sort of poor quality control........ oh no wait a minute, it's DJI so they will be busy working on the next model and won't care about it.
Do a compass calibration. That will fix it.

 

[Dr Jon]

The problem of PROPS either too tight or rattling has been escalated within DJI !!!

I will let you know how the intend to resolve and fix this. Soon i hope

 

[Dr Jon]

I had the rattling with one of my red props. It sounds like there is something wrong with the motor but it is definitely the prop. It's incredible how tiny the amount of play is to cause all that rattling. I put a small strip of black vinyl tape under the prop on the flat part that contacts the mounting shelf. No more rattling... no problem locking the prop either.


Sent from my iPad using InspirePilots

I tried that as first option but found the Props that didn't have a problem suddenly become to tight to lock. so i resorted to the foam in the central cavity of only those props affected. Looking forward to DJI solution when they decide to fix it. !!

 

[Argus]

Dr Jon:
Just recieved my Inspire 2 and one of my red props has the rattle, but I do not believe it is the prop, I think it is the prop mount. The other red rotor and the white ones do not rattle, so I took the red prop on the mount that did not rattle and put in on the other red mount and it rattled. Same thing for all the red propellers (all rattled on the one mount and none rattled on the other mount. So It seems the mount is out of tolerance. Now mine came with extra prop mounts and allen screws. But, no allen wrench came with it, and the 2mm allen I have does not seem to fit properly. Taking a piece of the plastic that the accessories came in and placing it over the mount fixes the problem like you said. I am sending mine back.

 

[Dr Jon]

The mounts use a star scree not an Allen key.

DJI know the problem and its been "escalated" we should hear a response early next week. They know there is many owners with this problem so i'm sure they will fix it.