My 5" build has been having an issue where sometimes after doing rolls, it will spiral out of control and crash to the ground. The Blackbox log shows one of the motors going to 100%.

This was happening quite often when I was using this tune: youtu.be/1gYldNl-nLg
After dialing the sliders back a bit, I thought the issue had completely gone away. I got in about a dozen flights before it happened again.

This is a desync, correct? Is it likely that I need to dial back the PIDs some more? I've read that it could be a bad motor or ESC as well.

Any insight would be appreciated.

Quad (4s): https://www.getfpv.com/xilo-5-freestyle-...ition.html
DVR crash video: youtu.be/wgmiqTUiRTo
Blackbox log (different crash than video): https://app.blackhole.run/#04dcb61af414q...mJTYsoGerY
Betaflight Config: https://pastebin.com/grWASnvM
Betaflight Dump: https://pastebin.com/P2hsNguC
BLHeliSuite32 Overview: https://app.blackhole.run/#ca5c672cf11Dz...ih24J1fYur

Does it do it if you put all the sliders back to stock settings? (center) I would put all to stock Betaflight settings first, and see if it still does it. (for an average 5" quad the stock BF tune is great) Not much point in lowering filters or tuning a quad that has a problem. First get it flying well on stock tune, then make small adjustments from there.

I don't like the way Bardwell tells people to just "turn the filter sliders from 1 to 1.5" without explaining what that is even doing. I would never make a large jump when adjusting the filtering, or PIDs, and certainly not all at once like he recommends in that video. If something causes a problem it is hard to know what caused it if multiple things are changed drastically. Or it makes it hard to tell if you even like the change or not if multiple things are changed at once.
Personally I make small adjustments to filtering, and do a quick test flight to check it out and feel motor temp.

I'm not saying that is a bad tune, might be great. I just wish he would at least explain what he is telling people to do rather than just "move all these sliders to this number"

And if this is a new build I would recommend first trying it out with all the PID and filter sliders at 1 (centered) That will tell if it is a issue with the tune or something else going on.

(07-Sep-2021, 12:29 AM)MrSolo Wrote: Does it do it if you put all the sliders back to stock settings? (center)  I would put all to stock Betaflight settings first, and see if it still does it. (for an average 5" quad the stock BF tune is great) Not much point in lowering filters or tuning a quad that has a problem.  First get it flying well on stock tune, then make small adjustments from there.

I don't like the way Bardwell tells people to just "turn the filter sliders from 1 to 1.5" without explaining what that is even doing.  I would never make a large jump when adjusting the filtering, or PIDs, and certainly not all at once like he recommends in that video.  If something causes a problem it is hard to know what caused it if multiple things are changed drastically. Or it makes it hard to tell if you even like the change or not if multiple things are changed at once.
Personally I make small adjustments to filtering, and do a quick test flight to check it out and feel motor temp.

I'm not saying that is a bad tune, might be great.  I just wish he would at least explain what he is telling people to do rather than just "move all these sliders to this number"

And if this is a new build I would recommend first trying it out with all the PID and filter sliders at 1 (centered) That will tell if it is a issue with the tune or something else going on.

Finally got a chance to fly again the other day. Reverted to the stock Betaflight tune and that definitely tamed it down. No stability issues, but then again I was able to fly it about a dozen times with the old tune before it crashed.

Bardwell's tuning video did leave me a bit confused, but I figured since he put the kit together it would be fine. I'll leave it at the stock tune for awhile and go from there once I actually learn what the sliders do. Thanks for the help.

What is your min. idle set at? Do you have dynamic idle set up? I was having the same problem with occasional desyncs on rolls and flips. I increased from default to 6% min. idle and haven't had an issue after that.

(14-Sep-2021, 06:28 PM)Bud13420 Wrote: What is your min. idle set at? Do you have dynamic idle set up? I was having the same problem with occasional desyncs on rolls and flips. I increased from default to 6% min. idle and haven't had an issue after that.

It's set to 6% currently. Changing it to 7% was one of the first things I did after it first fell out of the sky, but it didn't make a difference.

I havent looked at your logs.
Should not need to raise idle %.

3 ways Ive seen quads go bezzerk mid flight.
1. FET half-shorting. Raise throttle over 40-60%.. goes crazy.
2. PID crazy high. People copy-paste Vanovers P80 I110 D60 from a 4S quad to their 6S.
3. Loose wire/cable. Whether its rx or the mamba ribbon cable to the ESC.. if vibration is causing loss of contact, quad will go crazy.

(15-Sep-2021, 06:57 PM)romangpro Wrote: I havent looked at your logs.
Should not need to raise idle %.

3 ways Ive seen quads go bezzerk mid flight.
1. FET half-shorting. Raise throttle over 40-60%.. goes crazy.
2. PID crazy high. People copy-paste Vanovers P80 I110 D60 from a 4S quad to their 6S.
3. Loose wire/cable. Whether its rx or the mamba ribbon cable to the ESC.. if vibration is causing loss of contact, quad will go crazy.

In my case I think it’s definitely the PIDs, since it happened fairly often on the Bardwell suggested tune, but has happened a lot less since I’ve backed off on the sliders. Would the fact that my quad doesn’t like the Bardwell tune indicate some sort of underlying issue, or is it likely due to variations in the electronics or software?