Dear all
We set up a “normal” FPV race-copter with a pixracer FC and arducopter 4.0.3:
XRotor Micro 60 A 4in1 ESC
iflight xing 2806.5 1800kv
Prop: 7x4,5x3 HQ
Bat: 6s 2200mA /60C
But we do not get it to fly locked in as expected with normal FPV race flight controllers (Betaflight, Kiss…)
The PID’s had to be lowered to an extrem to have it fly with no vibration.
In automode the copter is flying nicely but with no agressive manevers.
Is it the pixracer or ardupilot that limits the usability of ardupilot for a FPV race quad (maybe loopfrequency)?
Have others come up with setups (Settings, Hardware recommendations) that give a similare locked in feeling in FPV as with traditional FPV gear?
Thanks a lot for all inputs
Mat
Let’s see your parameter file. 1st question is what did you set the INS_GYRO_FILTER to before doing anything?
I just built a QAV-250 with 5030 props and it flies as good as any iNav/Betaflight board I’ve flown, but I’m not a racer. I let it run the autotune and it is super responsive (to me). The only issue I had setting it up was vibrations, which gave me GPS glitches. I designed a low-profile mount that cut my vibes to <10.
Can you post the log file from your last flight and I’ll see if I can help. I can also send you links to the mount.
Thanks for the replies and the willingness to look into my param file.
I uploaded the bin and the param file of one oft the tests.
In this test I had no ESC with telemetrie yet and therefore the thorttle based notch filtering is not yet good.
To see the mounting would certainly be interessting.
Matthias
I would start here with basic pre-tune settings. As I mentioned the Gyro filter is critical. I have a PixRacer on a 210 5" and I use 80Hz. 60Hz may be a good place for you to start.
https://ardupilot.org/copter/docs/tuning-process-instructions.html
I’m using throttle referenced notch filter on this craft only because I haven’t got around to FFT referenced as I have on other craft but that will be the plan as no ESC telemetry on this craft.
I could share the parameter file but I have a very compliant FC mount and the differences between a 5" and a 7" may be large enough for it not to have much value.
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I am NOT AN EXPERT. But, I went through some growing pains with my 250 quad and got through it.
I wouldn’t disregard any advice, but your vibrations are too high. I wouldn’t mess with anything else before you fix that. You can’t really balance your props, so put all new ones on and add a lot of damping to your flight controller.
Your vibrations are higher than what mine was when I was having fly-aways. Your vibes are peaking at over 25, which is high. I started with my pixracer mounted on those cheap rubber bobbin screws and then went to a 3M gel pad, which helped a lot. I eventually made my own mount and have vibrations that max out at ~12. I haven’t gotten a vibration-related message since, and my GPS is locked in.
Here is a link to the 3D printed mount: https://www.thingiverse.com/thing:4379945
I don’t know where I got the bobbins from; probably HobbyKing.
getfpv.com link: https://www.getfpv.com/replacement-silicone-vibration-damping-balls-4-pack.html
Bangood: https://usa.banggood.com/Anti-vibration-Rubber-Shock-Absorber-Ball-AV-Ball-150g-p-917595.html?rmmds=search&ID=228&cur_warehouse=CN
You can also find premade kits, but they were too tall for my quad.
Thanks Dave
I am gona start with a new mount in CAD with yours as a starting point.
I will let you know…
Can someone recommend a good 4in1 ESC with Telemetry that is correctly detected by ardupilot?
You can have my Fusion 360 files if you want them.
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I would personally see if your can lower your vibes mechanically first (damping) before you buy a new ESC.