Quad Freaking Out During Flips and Rolls
Okay, I’m dropping this here in hopes that someone has seen this before. Yesterday I smoked a brand new QQ190 Tank frame on its first flight since the rebuild.
While doing flips or rolls where my copter will stop sending stick commands to the copter and lock into a high-speed. From what I have been able to determine this only happens if I perform a flip or a barrel roll. I have been able to fly race style with fast acceleration and hard turns, but once I go inverted all hell breaks loose.
This (was) my QQ190 Tank. I was not flying video yesterday when it happened for the last time, but this is identical. VIDEO
This has happened during my last two flight sessions. The first time this occurred I added a new profile of slightly adjusted PIDs/Rates–after making sure the profile was stable in horizontal flight I tried acro flying and my first 360º roll never ended. The crash was light so I dusted things off and went back to my original profile and continued to fly. Back on my default profile things appeared normal until it happened again this time there was frame damage and we were done.
I rebuilt the copter(steps below) and on my first battery after shaking things out she went down again in the exact same way.
To be clear flips and rolls will cause the craft to spin out of control on the roll axis.
Trouble Shooting:
Checked all hardware for physical damage. All wiring was meter tested for common, +volts, shorts, opens. ESCs were bench checked and calibrated all checked out. FC was wiped and reprogrammed from scratch with the latest stable TBS build and PIDs were left stock. I purchased a QQ190 Tank V2 base and reinstalled everything and checked everything again.
During the freakout, my VTX, camera, LEDs still have power and are functioning and my RX is accepting disarm and failsafe commands.
Unfortunately, the build does not have a black box so the video above is all I have.
SPECS:
- Frame: QQ190 (Tank)
- FC/PDB/VTX: TBS Powercube Elite Colibri RACE v2
- ESC 20A Favourite Little Bee
- RunCam Swift Mini
- Lumenier SKITZO 2500KV
- BetaFlight (Current TBS stable build)
- Flight mode: Acro Airmode (only)
UPDATE: Last night was the maiden and I’m sad to report that the spinout is still an issue. During the maiden making sure that level flight was okay, for the most part things were good accept for some yaw oscillation, but no real tuning had been done.
All level flight including hard turns and aggressive banks checked out, basically what you would do during racing. I was also able to do laid out flips front and back and power loops, so soft-er stick maneuvers. Anything quick sticks resulted in a spin out. I also tried to hit as low as throttle as possible before performing inverted maneuvers.
I really wish this damn FC had a black box (or I could even find one), but that’s all I have to go on.
I have replaced the ESC’s with the TBS Powercube bulletproof ESCs (updated to current BLHeli) and rolled back to stock Betaflight PIDs (not TBS PIDs). Firmware on the FC is 3.0.1, the latest build available via the TBS client (non Vendetta). I also turned off the accelerometer. The only programming I haven’t done is a full wipe of the FC with a clean install. The only flight components still not replaced are the Colibri Race V2, PowerCube FPVision, Lumenier motors SKITZO 2500kv.
Here is the most current CLI dump.
Thank for all the help today and sending over that prop data. I’ll take a look.
Here is the CLI Dump.
5051s are pretty severe- without much gain in performance, and a lot of extra amp draw. You are welcome to check out our test data- we haven’t specifically tested the 5051 on your motor- so it’s hard to tell what it would pull, but we have tested on several other motors with interesting results- You can dig through github to see the results- we will have posts with nice graphs published soon.
https://github.com/QuadQuestions/Motor-Test-Data
I emailed a response via our helpdesk so check there so that we can get you flying again.
Anthony,
Thanks for getting back to me. I also was thinking Desync, but I have never seen a Desync as extreme/violent as this, it literally ripped the arm off my (brand new) QQ190 Tank frame. But I guess if you are ripping and something goes wrong it’s even more dramatic.
I’ll post my CLI dump later tonight, it’s pretty much stock to whatever TBS has in their FC updater.
The ESCs are running rev.14.9
Motors: are Lumenier SKITZO 2500kv
Props: RaceKraft 50/51 TCS and Lumenier Butter Cutters.
I agree on the Little Bees and was actually going to be replacing them this week with the TBS Powercube Bulletproof ESCs.
Sorry guys, not sure how this posted anonymously, but it’s my question.