Hello guest, if you read this it means you are not registered. Click here to register in a few simple steps, you will enjoy all features of our Forum.
This forum uses cookies
This forum makes use of cookies to store your login information if you are registered, and your last visit if you are not. Cookies are small text documents stored on your computer; the cookies set by this forum can only be used on this website and pose no security risk. Cookies on this forum also track the specific topics you have read and when you last read them. Please confirm whether you accept or reject these cookies being set.

A cookie will be stored in your browser regardless of choice to prevent you being asked this question again. You will be able to change your cookie settings at any time using the link in the footer.

Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Unstable flight, flying backward.
#1
Hi guys, 

It started today, I take off, everything looks good, and after few seconds I see the drone keep trying to flight backward, at the beggining is easy to compensate with pitch, but after a minute or so, it gets really difficult to keep the drone stable, it I release the pitch forward, it comes backward really fast. Any idea what could be causing this behavior ?

My acelerometer looks good, properly calibrated. 

Thanks
Reply
Login to remove this ad | Register Here
#2
So it sounds like you're flying in a horizon/self leveling mode right? I am guesing this because you say
Quote: I release the pitch forward, it comes backward really fast

Have you tried re-calibrating the accelerometer? Maybe something went wonky with it

Other than that I might check settings / trim on your radio...

That's probably where I'd start, you may have tried all 3 but I figured I might as well just throw it out there just in case.
carl.vegas
Current Quads: Operational: Diatone GT2 200 In need of repair: Bumble Bee, tehStein,  Slightly modified Vortex 250 
Reply
#3
You had trouble in an earlier thread with proper motor direction and prop mounting. Are you sure you have those correct now? Can you post a photo of your quad with a clear view of the propellers (not spinning)?
[-] The following 1 user Likes sloscotty's post:
  • flabombarda
Reply
#4
(02-May-2017, 02:04 AM)Carl.Vegas Wrote: So it sounds like you're flying in a horizon/self leveling mode right? I am guesing this because you say

Have you tried re-calibrating the accelerometer? Maybe something went wonky with it

Other than that I might check settings / trim on your radio...

That's probably where I'd start, you may have tried all 3 but I figured I might as well just throw it out there just in case.

It was all done, in theory is not about acelerometer.
Radio trim was also reviewed.
And yes, I´m using self leveling mode Smile
Reply
#5
(02-May-2017, 02:26 AM)sloscotty Wrote: You had trouble in an earlier thread with proper motor direction and prop mounting.  Are you sure you have those correct now?  Can you post a photo of your quad with a clear view of the propellers (not spinning)?

Hi sloscotty, 

Yes, I can post a photo as you suggest, I reviewed that also, and motors look good.
It was working normally yesterday. Nothing was changed at configuration level or hardware level.
[Image: 4FtjBVIl.jpg]

btw, the front is the right of the picture.

Hope it helps !
Reply
#6
Check the receiver tab and make sure your pitch (elevator) channel is at 1500 with stick centered. If you've tried to adjust with the trim on your transmitter (which you shouldn't do) you may have changed this
[-] The following 1 user Likes RENOV8R's post:
  • sloscotty
Reply
#7
Drifting in self levelling modes that gets worse and worse as the flight progresses is normally caused by excessive vibration as this confuses the accelerometer readings. However, it normally affects a random axis rather than just one and in one direction.

It's hard to say much more without a black box log though.
[-] The following 2 users Like unseen's post:
  • flabombarda, sloscotty
Reply
#8
What fc? I had a diatone naze32 rev6 clone FC once that did something similar, and that board had a known fault with accelerometer drifting. I could plug it in to betaflight and in the illustration quad/brick in betaflight it slowly kept spinning faster and faster
[-] The following 2 users Like oyvinla's post:
  • flabombarda, sloscotty
Reply
#9
(02-May-2017, 07:48 AM)oyvinla Wrote: What fc? I had a diatone naze32 rev6 clone FC once that did something similar, and that board had a known fault with accelerometer drifting. I could plug it in to betaflight and in the illustration quad/brick in betaflight it slowly kept spinning faster and faster


This is Naze32 Rev5. When I connect it on Cleanflight/BetaFlight it doesn't spin or do anything abnormal.


What I'm going to do here is erase the board and configuration  and flash it again.
Is a simple test and worth a try.

Thanks all !
Reply
#10
I have a Naze32 Rev 5 that's been in use for a year on a couple of quads - I think it's a clone.  In horizon mode the quad stays perfectly level, but if I do some aggressive flips/rolls it starts to drift in a random direction as you describe.  I tried calibrating, checking for excess vibration etc but I've had to put it down to a dodgy board.  I only fly in acro mode now and the quad flies beautifully so it's not a problem.  Fyi - the graphic in Betaflight configurator was always perfect and stable, and the quad would initially fly great and level.
[-] The following 2 users Like hendrixhughes's post:
  • flabombarda, unseen
Reply
#11
With the older F1 boards, this seems to happen quite a lot with recent firmware. The latest Betaflight/Cleanflight reads the accelerometer at a much slower rate than it reads the gyro and I think this leads to greater accumulation of errors in the system. Maybe even of aliasing noise due to the lower sampling rate.

With older versions of Cleanflight - 1.13 and earlier - this was never a problem, especially if you used the MWRewrite integer PID controller.
[-] The following 1 user Likes unseen's post:
  • hendrixhughes
Reply
#12
(03-May-2017, 10:42 AM)unseen Wrote: With the older F1 boards, this seems to happen quite a lot with recent firmware. The latest Betaflight/Cleanflight reads the accelerometer at a much slower rate than it reads the gyro and I think this leads to greater accumulation of errors in the system. Maybe even of aliasing noise due to the lower sampling rate.

With older versions of Cleanflight - 1.13 and earlier - this was never a problem, especially if you used the MWRewrite integer PID controller.

Guys, 

That was really weird, I've flashed firmware again (latest Naze version, erasing all configuration and the problem seems resolved. It's not clear to me what caused the issue.
About my board, it's for sure a clone of Naze32 Rev5.
At some point I'll start flying in Acro mode, and my guess is these issues might go away since acelerometer is no longer as a source of information for autolevel. Am I right ?

Thanks,
Reply
#13
(03-May-2017, 02:44 PM)flabombarda Wrote: Guys, 

That was really weird, I've flashed firmware again (latest Naze version, erasing all configuration and the problem seems resolved. It's not clear to me what caused the issue.
About my board, it's for sure a clone of Naze32 Rev5.
At some point I'll start flying in Acro mode, and my guess is these issues might go away since acelerometer is no longer as a source of information for autolevel. Am I right ?

Thanks,

Yup, the accelerometer is not used when flying in acro mode
[-] The following 1 user Likes oyvinla's post:
  • unseen
Reply
#14
You are correct. In acro mode, only the gyro is used and it has no concept of 'level'.

It's really odd that reflashing it made the problem go away though.

Ghosts in the machine. Cool
Reply
#15
(03-May-2017, 02:49 PM)unseen Wrote: You are correct. In acro mode, only the gyro is used and it has no concept of 'level'.

It's really odd that reflashing it made the problem go away though.

Ghosts in the machine. Cool

I agree, especially because I did not change any setting in the past week or so. Maybe is a corruption on the board memory.
Before flashing I was trying to connect on Cleanflight to take screenshoot of all my settings, but when I tried to do that, after a reboot, the board "bricked" (happened before already).
I had to put a jumper on the BOOT pins, and reflash it erasing the whole board, resolving the problem.
Reply


Possibly Related Threads...
Thread Author Replies Views Last Post
  After 1-2 minutues of flight, drone flips over in air doublebubble 22 615 16-Feb-2024, 11:32 PM
Last Post: mstc
  Basic Autonomous flight T_Jennings 2 146 04-Feb-2024, 10:26 PM
Last Post: mstc
Star What are you flying now? Share your drones samysh 10 437 21-Jan-2024, 04:52 PM
Last Post: iFly4rotors
  No input from reciver on my flight controller Horbalisk 0 158 17-Jan-2024, 07:17 PM
Last Post: Horbalisk
  Flight controller not recognizing CRSF in betaflight SenaFPV 10 454 15-Jan-2024, 09:03 AM
Last Post: SnowLeopardFPV


Login to remove this ad | Register Here