New Here. P4: Love it,but three problems (w/ video) [long post]

TK-421

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gswilder

Similar results as yours. Definitely having the bounce issue. It was scary first time it dropped a couple feet. Then I started monitoring more closely and did some testing. I will pop it up to 20 feet or so. And then watch the altitude. It will move up and down at least a foot.

Also having level horizon issues, even after couple IMU cold calibrations. Squeaky gimble problem.

Getting a replacement from Apple tomorrow. Will see if that helps, and let you all know.

GSW

TK-421

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hungdang

TK-421, how low did you fly? less than 2.5m (8.2ft)?
if you did then try to turn off VPS because VPS will adjust the phantom 4 base on the level of ground

pgrover516

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pgrover516

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DJI-Tim

Thank you for reporting about the issues, could you please pass me your flight data so our R&D can analyze it. Thank you

jck

I am new to flying the Phantom 4 and at about 20' in altitude and hovering with no stick movements, I noticed a bouncing up and down of maybe 1 plus feet. Being new, I didn't know if this was the norm or not.

TK-421

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TK-421

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DJI-Ken

TK-421 Posted at 2016-3-23 22:33
Tim, I would love to get you the flight records. Please instruct me exactly how to do that. See my ...

I've been flying the P4 for a month and it has been nothing but perfect.
The DAT files of the flight log will tell exactly what happened.
In the Assistant2 , choose flight record, then check the boxes of FC file that you want to have analyzed. then click save to local and the log will same to when you saved it.
Then upload that log to Dropbox or whatever you use for file sharing and attach the link in your DJi ticket.
Also, have you preformed a camera sensor calibration, see if that helps.

TK-421

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gurnpj@gmail.co

I would like to add my voice to this and say that I have definitely noticed the drop in altitude when coming to a stop. I was flying tap-to-fly one time and saw the drone came to a stop nearly in a tree due to the obstacle avoidance feature, however, when stopping it drops in altitude by nearly a foot sometimes more. Had I not had my hand on the controller and raised the altitude it would have lowered onto a branch and likely fallen to ground. This is a serious issue with the P4 that needs to be addressed ASAP.

amatthews@t-onl

jck Posted at 2016-3-23 14:06
I am new to flying the Phantom 4 and at about 20' in altitude and hovering with no stick movements, ...

...same situation: P4 bouncing down without any stick movement...hope it can be fixed with a firmware update

SteadyFly

Hey guys, thanks for the post. I reported the horizon issue last week. It is a real problem and very unfortunate for those of us who do landscape videography and photography.
I'm not sure what I should do about this, as the P4 has some amazing features but not having an even horizon is such a negative. Other then that I really love this drone, but will have to stick with my I1Pro for horizon issues.

SteadyFly

Here is a link to a comparison I did with the P4 and Inspire 1 Pro -

For the life of me, no matter how many firmware updates/IMU calibrations/general calibrations/gimbal angles, I cannot get rid of these distorted horizons. Anyone have any advice? I'm stumped here.

TK-421

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TK-421

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DJI-Ken

amatthews@t-onl Posted at 2016-3-24 03:03
...same situation: P4 bouncing down without any stick movement...hope it can be fixed with a firmwa ...

A IMU calibration will solve that.
And if it still persists, make sure the sensors on the VPS unit are clean.
IF nothing helps and it still bounces when hovering then it may need to be sent in for repair.
You are on the latest firmware correct?
Also, try flying over different surfaces to see if it changes.
The VPS on the P4 works on sonar for altitude and over 10m it's the barometer that gives you altitude.

SteadyFly

Ken, thanks for your help. Do you know if DJI has a long term strategy for helping it's Phantom series users?

TK-421

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DJI-Ken

TK-421 Posted at 2016-3-24 05:47
Multiple meticulous IMU calibrations didn't help the bouncing in my case (so far). But now there's ...

Can you post a video of the bouncing and I will have the repair center view it.
Thanks

TK-421

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TK-421

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DJI-Ken

TK-421 Posted at 2016-3-24 09:04
I finally loaded the mysterious "Driver" file that got downloaded with the Assistant app and now e ...

The last flight will be the one on top. And you only need the FC log, that's the DAT file of the flight.

arsensmusic@gma

Drivers need to be installed for the DJI assisstant app to work.

DJI-Ken

Flyin'Bryan Posted at 2016-3-24 10:02
These forum changes.. SUCK

Sorry man, I just work in the forum. I have no pull on how it operates.

TK-421

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DJI-Ken

arsensmusic@gma Posted at 2016-3-24 11:02
The DJI Assistant app for OSX is a trainwreck. Would not upgrade the firmware for the life of me. Lu ...

Did you install the driver as well that is in the download file. It installed fine on my Mac.

DJI-Ken

Flyin'Bryan Posted at 2016-3-24 11:07
Please explain this to me.
your theme Forum Layout Be DJI-Tim Warning
Continuous 30 Days accumulat ...

I know nothing about that, I will email Tim and see what the issue is.

DJI-Ken

TK-421 Posted at 2016-3-24 11:12
Okay. The main reason I'm kind guessing that all the dates and times are wrong in DJI Assistant Fl ...

Ok, thanks.
Don't know why the date is one day ahead, the P4 is fast but not that fast

You can try to delete the app and reinstall and see if it make any difference.
Is it exactly one day, or are the hours way off too from 24hrs.

I will have the DAT file analyzed tomorrow and get back to you.

arsensmusic@gma

DJI-Ken Posted at 2016-3-24 11:14
Did you install the driver as well that is in the download file. It installed fin on my Mac.

Can't believe I missed that!
Thats embarrassing.
Thanks for the reminder!

DJI-Ken

Flyin'Bryan Posted at 2016-3-24 11:07
Please explain this to me.
your theme Forum Layout Be DJI-Tim Warning
Continuous 30 Days accumulat ...

OK, I talked to Tim. Its the language you used. "whoever is doing this is a blank blank.
That's what caused it.
You have to remember, there's many many people viewing these posts including hundreds of users and upper management who want friendly talk and no name calling. It's their forum and their rules and everyone has to respect that.
So, in the future just please watch the name calling.
And if you think someone may be offended by you comment, please edit the comment to be a little nicer

TK-421

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DJI-Ken

TK-421 Posted at 2016-3-24 11:45
Awesome. I hope that is the correct file. The actual flight time was 6:37pm (mountain time, US) on ...

There may be a slight bob if your is Sport mode and coming to a fast stop and your in the VPS range.
Remember, the VPS uses sonar to measure your altitude in the VPS range (10m).
So if you are in Sport mode and the aircraft is close to a 45 degree angle and then you stop really quick to level, the sonar reflection can get messed up and the aircraft may ascend or descend a few feet.
If you do this at a higher altitude then the barometer is controlling altitude and you shouldn't get that.
Also, it depends of the terrain you are flying over since the return sonar reflection may act different over grass, pavement, sand, or whatever.

TK-421

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DJI-Ken

Flyin'Bryan Posted at 2016-3-24 11:54
Well that's bull honky... Because., I said the word moron... And it was directed at NO ONE in part ...

I did and it was referring to whoever changed up the forum, which is the management so basically calling them the name.
I know you may not like it, but everyone has to follow the forum rules.
It's over now, so let's just move on to a different topic.
I hope you still get a P4

DJI-Ken

TK-421 Posted at 2016-3-24 11:57
Here's another short video of altitude issues from a different flight. Here, wind was somewhat prese ...

Can you try it over the pavement and see i it still does it.
That terrain may be the reason with all the foilage, if it does it over flat ground then it may be an issue.

TK-421

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DJI-Ken

Flyin'Bryan Posted at 2016-3-24 12:20
I will, but just so you know., Many of us don't like it. But thanks for checking on what I was ask ...

I understand what your saying, now go have a beer and have one for me too

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