Inspire 2 Falls fromd the Sky, arm problem?

mmarian · Jan 28, 2018

SteveFPV said:
With the incidence of this motor mount to CF tube failure on the rise, and the subject post flight and even in-flight videos, the proof of what is happening is irrefutable IMHO. The integrity of the motor mount to the cf tube arm is not sufficient. A very dangerous flaw which DJI knows about, and in their best interest, should address quickly.

Well, DJI apparently claims that failure rate of this joint is 0.01% and that is not apparently enough for them to worry about it. I suspect that they will redesign this on future models but if you decide to wait for them firstly acknowledge this as a real issue and then do something about it, I am affraid tgat you might be waiting in vain and for a long time. On the other hand If you feel that you are not satisfied with rigidity of this joint you have already options now to address it. The choice is yours..

Phil DeVore · Jan 28, 2018

STKNRUD said:
I may be wrong but I don’t think DJI offers a CF prop. Why not? That makes the addition of one a “modification” which could influence warranty. Wang is definitely a smart businessman but this and other forum posts suggest the products are not without design flaws. I doubt Wang oversees every aspect of even the engendering of each product any more than Tim Cook does.

No DJI doesn’t offer a carbon fiber prop but you can purchase them at Florida Drone Supply. They have several different types. I personally went with the Tmotor folding winglet propellers. I went flying today with them and I really liked the way they helped with control, speed and sensitivity. I had been using the Coptermax folding carbon fiber ones. I will continue to fly them for the future until they come out with another version.

Phil DeVore · Jan 28, 2018

Phil DeVore said:
Where did you get the tmotor propellers from please.

Florida Drone Supply

SteveFPV · Jan 28, 2018

mmarian said:
Well, DJI apparently claims that failure rate of this joint is 0.01% and that is not apparently enough for them to worry about it. I suspect that they will redesign this on future models but if you decide to wait for them firstly acknowledge this as a real issue and then do something about it, I am affraid tgat you might be waiting in vain and for a long time. On the other hand If you feel that you are not satisfied with rigidity of this joint you have already options now to address it. The choice is yours..

.01% and rising with af hours
If DJI want to impress the regulators they have to show more initiative. Accidents with known cause by design flaw with no corrective action looks real bad, especially when it cracks someone in the head. Important people are taking notice, and its simply in DJI's best interest to act responsibly and professionally.

Omega Flight · Jan 30, 2018

mmarian said:
I have not had failure and MAYBE I will never have one. But after reading reports of the motors flying away I decided to open one motor mount to see the situation for myself. From my engineer brain's perspective I have to say that it did not give me much confidence when I saw how the motor mount was glued onto the tube. What makes the matter worse is that the tube is actually cut in half inside of the mount! So there is only half of the CF tube glued to the mount and that half only goes about 20mm in. So, the surface contact area between the motor mount and the CF tube where the adhesive is applied is actually very small for my liking. Therefore I've decided to order the braces from dronesupply. IMHO it is a solid improvement over the existing situation. I am not suggesting that the original design is flawed because I have not done any scientific stress tests but as an engineer I feel that it is not the best solution either. For those concerned I would suggest to open up one mount, have a look at the situation for yourself and make your own judgement.

Thank you! Thanks for caring enough to open your drone for everyones benefit. Lots of knowledge gained here.....

Omega Flight · Jan 30, 2018

Phil DeVore said:
I am so concerned about the problem that I purchased the motor support mounts from Drone Depot NZ. They were mentioned in a previous thread and just for peace of mind I bought a set for $175 because that’s a small price that I am willing to pay so it helps me to feel safer when I am flying where there’s people around. I was told that there’s very few of these incidents but I want to limit my liabilities to innocent bystanders. I definitely don’t want to harm anyone by my not trying to be as safe as possible. Phil DeVore

its not a small price added to the thousands paid for most of these drones. This problem should be handled by DJI. Recall all drones or send a fix like the one you just bought free of charge we pay delivery. Or wait as more drones fall out of the sky and a potential accident and possible loss of life happens. Mark my words. Dji these drones are all over the world. Shame on you DJI fix the problem.....

mmarian · Jan 30, 2018

Omega Flight said:
its not a small price added to the thousands paid for most of these drones. This problem should be handled by DJI. Recall all drones or send a fix like the one you just bought free of charge we pay delivery. Or wait as more drones fall out of the sky and a potential accident and possible loss of life happens. Mark my words. Dji these drones are all over the world. Shame on you DJI fix the problem.....

As I wrote before, I have purchased the braces from Drone Depot. To me the peace of mind is worth the price. You argue that DJI should fix this but contra argument would be that the number of this joint failing is very small (maybe only a handfull out of 1000s of drones sold) and from DJI perspective that proves that their design is solid. I do not want to get drawn into this war of words and arguments. I assessed the situation for my self and decided to do something about it. To each his own..

ianwood · Jan 31, 2018

I've heard that putting the drone in and out of travel mode on rough ground can put a lot of stress on the mounts. I don't ever put mine into travel mode as they live in landing mode cases but worth noting for those that do. And I still check the mounts before flying each day.

ringolong · Jan 31, 2018

I always pick mine up when it is transitioning.

Lesmess · Feb 3, 2018

Phil DeVore said:
Where did you get the tmotor propellers from please.

I live in the UK and purchased them from Electric Wingman. I leave them attached all the time unless travelling long distances. I have both inspire1 and 2. The TMotor props just oozes quality, I have Xoar CF on my I1 they are good but don’t match the T-Motor for quality. Once you take her up with the T-Motor props you will not go back to the stock props.

Les

The Editor · Feb 3, 2018

There simply is not a high enough failure rate for DJI to care or be interested.
It is purely economics.
Ford and Pinto spring to mind.
You are also dealing with Chinese business culture - anybody who has dealt commercially with the Chinese will know what I mean regarding 'admission of a mistake within the corporate world'
The Inspire 3 will be out shortly and nobody will care about a 0.01% issue on an old model.

nuclearheli · Feb 3, 2018

An ounce of prevention right.

These forums are so valuable to me and this is one excellent example of why. I have no apparent issues with my arms failing but I guess nobody saw any signs that theirs were going to fail also. After reading about this problem I decided to get the brackets and install them as added insurance. All I can say is I feel better about it and won't be worried about a motor flying off of my drone.

Thanks Guys, excellent post and conversation. I have been educated and "inspired" to prevent a potential problem.

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jk_aerial_imagery · Feb 18, 2018

Lesmess said:
I live in the UK and purchased them from Electric Wingman. I leave them attached all the time unless travelling long distances. I have both inspire1 and 2. The TMotor props just oozes quality, I have Xoar CF on my I1 they are good but don’t match the T-Motor for quality. Once you take her up with the T-Motor props you will not go back to the stock props.

Les

Could you DM a link to these buddy also in the UK!

ithacapool · Feb 19, 2018

I cannot help it but have to ask.
Some of the videos above clearly point to aircraft failure.
I would be interested to know how DJI responded to these and if there is any form of acknowledgments on the more and more obvious problem

DaBone · Feb 19, 2018

My drone dealer got this message the other day..

"Thank you for contacting DJI Technical Support.

We appreciate that you have provided this information for our reference.

We will be forwarding this information to our Field Application Engineers and hoping for positive feedback. We'll keep in touch with you on regards on this.

I hope that I am able to provide you the customer service that you deserve."

We'll see if I get any response or if they stays quiet about it all.

mmarian · Feb 19, 2018

ithacapool said:
I cannot help it but have to ask.
Some of the videos above clearly point to aircraft failure.
I would be interested to know how DJI responded to these and if there is any form of acknowledgments on the more and more obvious problem

Ken who is a DJI rep and frequents on RCG has already responded. According to DJI the failure of this joint is about 0.01% and that in their view is ok and does not require any remedial action.

DaBone · Feb 19, 2018

But it continues to happen and it's a serious problem, since it's a 3kg drone who can fall down on people.

They should come up with a solution so that they who worry and those like me have problems, get a quick fix.
I have ordered and just got home the clamp device that was previously linked from New Zealand, to dare to fly at all.

Lose money here...

mmarian · Feb 19, 2018

DaBone said:
But it continues to happen and it's a serious problem, since it's a 3kg drone who can fall down on people.

They should come up with a solution so that they who worry and those like me have problems, get a quick fix.
I have ordered and just got home the clamp device that was previously linked from New Zealand, to dare to fly at all.

Lose money here...

If you talking about the drone depot clamps do not forget to watch the instruction video how to put them on. It contains crucially important info!!

DaBone · Feb 19, 2018

mmarian said:
If you talking about the drone depot clamps do not forget to watch the instruction video how to put them on. It contains crucially important info!!

Yes, I know.. Have the link and will put them on tomorrow. Have a couple of jobs later this week.

Lesmess · Feb 21, 2018

jk_aerial_imagery said:
Could you DM a link to these buddy also in the UK!

T-Motor Carbon Propellers - 15"x5" - Pair

Inspire 2 Falls fromd the Sky, arm problem?

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