There is another faulty gyro condition. One of the axis can have significantly higher noise floor than the others. Easy to spot when comparing filtered gyro noise spectrogram on each axis.
@@uavtech 4 out of 20 gyros I've checked have this problem. It's not very obvious fault. Some are still flyable when everything is tuned for high noise gyro, but it's not worth it.
I got a faulty gyro on Alpha Lumenier and I could see it directly in the configurator gyro graph because the RMS value of the pitch gyro was wayyyy higher than the ~0 of the others with no movement. In flight test, this leads directly into violent random hiccups on pitch and it's not flyable at all.
Thanks for the video. I have two Kakute HDV Fcs and both have this issue. Kakute rejected to replace my FCs just because the warranty time is over. This is not sth you can notice in a month. They need to replace FCs of all people who have this problem even thoough they have purchased several months ago.
This topic its really cool since I have been watching ur videos i learn so much and the black box like u say is like looking in side the engine thank u.
I got a talonf7fusion. It seams to have the same type of drop in one of the gyros on pitch. It doesnt happen every flight, but its there. On dual gyro scaled, I found it on the gyro1. It's at the end of a flip, it will have one dip randomly, which in turn makes the motors and dterm spike for the remainder of the flip. It doesnt drop like the one in your video, but there is a noticable dip. It looks very similar to the roll on the log at 12:44-12:48ish in your video.
i just spent two weeks troubleshooting and tuning out D term on pitch issue just to turn out to be gyro issue... i rebuilt that X8 twice completly 🤦♂️ Tmotor F7 HD pro but its proly my fault i had hicup or two while building it first time i doubt tmotor would have bad stuff
Great video thanks it happened with me before new kakuti F7 in yoo acces flip and crash I tried everything fly nice for one battery then do it again for next battery tell I changed with another FC and kept same esc and motor and same tuning now the quad flying nice i though it's faulty bord
I wonder how much disincentive there may be, for manufacturers to include blackbox on whoop/toothpick style boards. One manufacturer seems to have had no trouble including a modest 8MB flash, amongst other unique, board-realstate consuming extras, so it's not like there's a lack of space. Seems like it'd be helpful if BBLE had a layer of adjustable transparancy between the traces, and the synced video.
Just last week I build up quad with a FC that I had lying around (Talon F7 Fussion, with 2 gyros). On friday, while doing some corkscrews I immediatly noticed some random quick movement that I didnt commanded (i was using low rates, about 500 deg/s). Then I thought it could be the tuning, a loose cable, some motor, etc. Until I checked the blackbox I could see that, being my RC stick inputs "smooth", gyro on the pitch axis had very big spikes, which causes the system to oscillate quickly. Yesterday, I needed to unload some batteries after a race, and then I went to debug this. Problem was still there (good). Then I went to Betaflight Configurator and changed the default Gyro selector from BOTH to FIRST gyro. Problem persisted. Changed now from FIRST to SECOND gyro. Problem GONE. I guess these 2 gyro FCs can work very well when the remaining good gyro is selected. Time will tell. I also wonder, if when BOTH are selected, the algorithm makes an average of both, or thrusts the smoother one? Dont know... Good video and explanation!!!
Hi regarding to hot motors. How to solve this issue. Im flash 4.2.1 matekf411 aio. New builds,plus i tried turn both slider to far left also improve abit. But still get hot motors. Not hot but around 30-40c range. Is this consider bad gyro too that cant filter out noise effectively? What are the other options i have to take in order to make cool on all motor? Thanks for videos.
I wonder if that quad was crashed before? The kakute FC's have isolated gyros that actually unplug from the board itself. I wonder if that connection came loose
I think I have a bad gyro but I'm not sure. On a brand new build the quad tries to slowly yaw to the right and pitch backwards. In Betaflight on the setup tab when my drone is sitting flat on a table the model on the screen slowly yaws to the right. The FC is a Hobbywing F7 convertible.
@@uavtech Thanks I'll give that a try. The first thing I checked was the radio to make sure that I hadn't accidentally trimmed it or something. I also checked the end points and mid point to make sure they were setup correctly. Interestingly enough I can still control it well enough to fly but the RC link is at 0 on the OSD and the RSSI DBM is -130. I've been debating whether it was related. It's my only drone that has ever done this.
@@Loki_FPV666 bad gyro would result in shaky flight, etc... Drift is most likely a mid-point calibration or deadband issue because the RC link has too much jitter.
@@uavtech I raised the deadband from 0 to 5 and had two good packs but on the third pack it started doing it again but worse. Do I just not have it high enough? I'm also wondering if it could be a bad receiver since non of my other builds have had an issue like this, but I could be over thinking it.
Hi UAVTech. Can I send you my bb log and can you please help me determine if I have a bad gyro? It’s a sector 5 v3 hd BNF from Banggood. I’ve had such a hard time with this quad would appreciate your assistance!
I had the same issue with a bad gyro on a Kakute F7 AIO (the first version). I've got a new Kakute AIO with the older gyro (6000 version, as it has less issues with the noise and sensitivity) on the way to replace it. I'm hoping I don't run into the same issues on the new one...
I'm using a LUX F7 FC so when I saw your video I went straight to see if I have some issues with my Gyros. But from my point of view is alright. I'm wondering if the problem could be related to the input voltage of the FC as I'm still using 4S on my quads. Did you make your test even on a 4S quad?
It is a mechanical or settings issue for sure. The FW is sound. Defaults should fly OK. So if on filter defaults and PID Defaults, I would look into mechanical issues or props on wrong or something.
@@uavtech I tried every setting I could think of then thought well it flew fine before on 4.2 i put it back on the flight controler .I didn't change anything to the quad it's a gtr 349 and it stopped flipping out it was acting like it had a motor backwards .
Going to look more into my own quad, and the use of blackbox. For setting up a testfligh+t and logging into blackbox, is there some sort of flight pattern you should fly to get the best info/log? like flipps, rolls, throttle burst etc
If started out of nowhere, could be that or just lots of vibrations from something on it (props, motors, electrical noise, etc...). If new, make sure on bone-stock Betaflight defaults. If occurs on defaults, it is a mechanical or electrical issue.
@@uavtech Thanks for the reply! I have some longer screws on order. The screws holding the stack are almost to short and they had to really squash the gummies to get it together. I was wondering is lowering the gyro from 4 to 2 khz would help make the gyro less sensative?
I think I have 2 RevoltOSD boards that behave this way on FalcoX only? I kno that sounds weird! They both have a robotic/ disconnected feeling on the sticks? When I flash to EMU that disconnected, delayed robotic feel disappears? I worked with the FL-1 guys for months and only thing that fixed it was to replace the fc with a known good one....
Could a wire hitting the gyro cause weird looking gyro movement? I had what I thought was a bad gyro cleaned everything up and never had the problem again.
I had trouble with a iflight f7 mini twing getting weird yaw twitches.. adding 1 cap, improved a bit, adding 2 improved further, adding 3 big caps made all the trouble go away. it was only on the 1 gyro, but overall gyro noise was a lot better using both gyros, so between the caps on board or only using 1 gyro, I choose having 3 caps on my quad, since I have a lot real estate on my 5 inch. Do You Want A Black Box Of how the trouble looked like, without the caps and with them?
@@Chris-tm5ul interesting. I removed the small cap it came with, and added 2 gigantic 35v 1000mF, and it helped. But 3x caps was the one that really made the problem go away. I'm using 4s and 2306 2500kv motors. Don't know if it gets worse on 6s.
@@pippifpv Thanks for the info, I'm running it on 6s 2207 1700kv motors. I was thinking about changing the fc because of this, it's the second faulty iflight one I've had. The first was in a Titan DC5 which out of the box was so bad I couldn't fly it, it was shaking itself to bits! turning off one of the gyros sorted the problem though. Where did you attach all the caps? I just have the small cap on the power line at the moment but will try your idea before I dump it.
Wondering if you could help as I’m getting nowhere with various different sources of help. I get the roll of death by just hovering and blipping no more than 40% throttle. Most of the time it rolls to the right, however a few times I have ha sir happen to the left. The FC is a brand new MatekF722 mini and before swapping it out, the quad flew just fine. I’ve bench tested all the motors and none of them seem to be stuttering going from minimum to maximum. I’ve also changed the motor start up time to the minimum in BH Heli and still has no difference. Only thing I can think is that’s it’s a bad gyro? The box black data shows that even when arming on the ground the roll axis starts to have oscillations that seem to get stronger and stronger... any help would be appreciated as I’m out of ideas!
I've got the new betafpv 6s aio and when using 6s the camera blacks out and the motors go nuts on sharp flips and rolls. Its slightly better on 48kz vs 24kz. Tried multiple sized caps and out it in another build and it has the same problem. It doesn't black out on 4s but flies really poorly regardless of tune. Is this also a bad gyro or something else bad on the board? Unfortunately this board doesn't have blackbox.
@@uavtech I did and it flies great now. I was just wondering if it was something I was doing. Thanks for the response. Your videos have been a huge help. My quads have never flown this well!
Im flying kakute f7 on 7 inch quad. It fly excellent(on my opinion) on calm day, but when there is strong wind then having some random shakings even when flying straight. I think that its wind hitting the gyro ribbon and makes gyro noise. Can that be? Some one have any idea how to fix this?:)
@@uavtech yes ofcourse, by your videos, big thanks for that. It fly very smooth now and im absolutely happy with the tune. But on the windy days, when you feel wind pushesh on yourself, then the quad start to wobble randomly.. this seen even on fpv
