Signs of a BAD Gyro | Shendrones Siccario

Taking a look at what BAD gyro data looks like and how it can be like pushing a rope up a hill to tune against it. We have a tenancy to try to cover it up with firmware features, but that's just NOT a great approach. My best advice is to tackle it head on and work to fix the issue before moving forward any further.
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[@blackmennewstyle]

Such an underrated FPV channel

[@MrSmithersFPV]

your literally the best resource with Jb next in line for fpv information and I've been doing this since 2016! Thank you so much for the hard work honestly, much appreciated from us tuning nerds!

[@TrentTationnaiseXization]

Was watching Nurk fly this guy, cool to see ya doing a tune on it. Looks like a solid setup.

[@princesfpvdrones]

Thanks for sharing your findings, you the man! Moral of the story always address mechanical or electrical issues first.

[@MCsCreations]

Pretty interesting process, Mark! 😃 Stay safe there with your family! 🖖😊

[@sunsetpark_fpv]

The slo-mo take off was SICK.......thank you SO MUCH for showing the BB data on screen - to see it over the footage is a BIG HELP! So what is the solution here? A new FC?

[@uavtech]

Yup. New FC.

[@Kapharnaum92]

Thank you for your videos. It seems so easy for you and so hard for me to understand :)

[@HolaACchillin]

I really like those motors, I have tried all kv in that size except 1900. So I went and I picked up 8 motors, building rn, watching your cool af video! The slow mo take off is cool!

[@h2o-fpv623]

great video thank u

[@jamesparkerfpv435]

Thank you

[@samuelepaganoni9741]

Thanks for sharing! I have a quad with yaw slow oscillation on a specific throttle value. I tried changing pids and filters and it gets a bit better but it's still there. Tightening or loosening the fc screws it shift the throttle position where it oscillates (changes frequency). It seems a mechanical problem but only on the yaw axis. Unfortunately I don't have the blackbox to investigate. Could be a faulty gyro? Thank you.

[@samuelepaganoni9741]

Quick update: changing the fc solved the problem.

[@Gespar]

How would you rate the tune and that drone performance after the FC change? Did you get rid of the wobbles caused by wind or is the heavy mass just problem when there is external forces ?

[@uavtech]

They left the MatekF7on it I believe. I did my best to tune withn LuxF7. Sent back with msg of it needs to be replaced. Matek was put in and i was sent a log. I said it still had the issue, but on roll now and I have not heard back since.

[@FPVish]

thats incredible how you understand those lines.. what do you recommended for me to go to understand that same information?

[@uavtech]

theuavtech.com/blackbox/

[@marc_frank]

can someone implement a fft filter in betaflight? i left a comment about this earlier, but didn't know it existed -convert gyro data into frequency domain with a fft -select range of frequencies -convert that range back, using a inverse fft this completely eliminates the high freq noise and no other filters have to be used there are a bunch of matlab examples online i guess the problem is running them real time on our fc's

[@uavtech]

That is what the Dynamic Notch does!! It has been in the firmware for 3 or 4 years now. See kzbin.info/www/bejne/d3iWh5Z-rMqhrc0. The settings have changed since, but the FFT process is the same. We are now working on SDFT which will increase the resolution from 16bins to 50bins in the FFT centering (more Bins means the center of the notch will be close to the peak -- higher resolution). Why the RPM is better for tracking motor noise is because it is faster. The FFT process takes about 25ms to detect and move the notch. Mostly that is it is a running analysis so as new data comes it, the FFT starts to shift but since only 16bins across the spectrum 100hz to say 600hz, it takes some time for the vibrations analysis to start to run the notch up. Of course each analysis step is being completed in the processor in less than one loop (

[@Quick-Flash]

@@uavtech he isn't asking about notch filters but rather using an fft and then an inverse fft to remove noise. There are issues with that. One we dont have good enough resolution even with the updated dft to do a good inverse and the cpu power and latency will still need to be addressed

[@uavtech]

Oh, my mistake. I'm not familiar with that one. Thanks for clarifying.

[@Quick-Flash]

@@uavtech www.sandv.com/downloads/0508gabe.pdf You can skim through this if your interested in the inverse fft for filtering.

[@momentum3825]

Any recommendations about esc placements? Should i connect both escs to 1 xt60 with 2 capacitors?

[@uavtech]

One CAP per ESC. 1000uf, 50V if u can fit it.

[@Gespar]

any way you would like to make part2 of tuning this beast, if I send you the log files for this same setup with settings from where you left off?

[@Maorifpv]

nowadays it is very common to receive flight controllers with gyro defects. And it is very difficult to prove what is going on to receive the refund. My last t-motor f7 HD came with faulty gyro. Not long ago I bought a dalrc f7 that also came with faulty gyro. Before that there was an Airbot Omnibus f4 that also came with a defect in the gyro. I am very careful in the assembly of the fc's and I can see immediately in the first take off when the gyro is not good. The type of vibration / defect is very obvious. Buying a flight controller today is Russian roulette, at least in my case.

[@kwadkrazy6078]

Hey Mark, I've got an old drone that I've been working on tuning, but for some reason, after a crash, the tune is wrecked. There are huge high throttle oscillations, propwash handling is terrible, and its super inefficient. And then after a couple days of flying it, it clicks back to its old way of flying, and is normal. I'm not changing any settings before or after the occurrence, and am by no means a noob, but cant figure out what on earth it could be. Any input would help immeasurably

[@uavtech]

Maybe dirt in the motor got sorted, etc... Sounds like a mechanical thing fixed itself.

[@kwadkrazy6078]

@@uavtech That's what I thought as well, but the problem persists, it's happened two or three times now. I've checked all the motors, props, capacitor, all the screws are tight...I'm thinking of just getting a new stack

[@marc_frank]

@@kwadkrazy6078 reflow the fc?

[@DiogoFilipeR]

Put a servo in that big camera to control the tilt of it in middle flight! You can place a second fpv camera on top of it to be able to see what that camera is seeing too. A build with 3 cameras xD

[@uavtech]

Nice!!

[@pablofpv]

I was definitely getting a “Terminator” vibe from this video? I was expecting a "Hk" was going to come after me……😧

[@BikeGuyFPV]

1:31 kitty!

[@pirateradioFPV]

Maximum chonk achieved 👀

[@MrEly2000]

Looks like a Troy build drone

[@GardoRotor]

LOL I have the same scale HEHE