Accelerometer : ON

Calibrate acceleration if needed. Put the quad on a flat surface and launch the calibration.

Set logging frequency to 500Hz

• Erase memory. You could do it either from Betaflight configurator or from Betaflight OSD
  
• When memory is full, new flight won't be recorded.
  

The best for now is to make only one flight per lipo. This means not arming/disarming multiple times.
Connect the lipo, arm, flight, land, disarm, disconnect the lipo

Even Machine Learning can't know the motors thrust at 100% if they stay at 25% all flight long. The general idea to get quality data is thus to do every move, every trick, border every limit. Particularly useful are :

• No Crash, little or no wind.
  
• Full throttle pushs
  
• Hang time. (0 throttle). The best is to do this with differents attitudes (front/side/top first)
  
• Cruising at different speeds.
  
• A bit of hoover.
  
• Flips and spins. Don't forget Yaw Spins !

• Activate Mass Storage in Betaflight Configurator
  
• A new volume appears on your PC, with the logs in the order of the flights.
  
• Copy these log files to somewhere on your PC.

One should use a btfl_001.bbl (or btfl_002.bbl, etc) file, but not the btfl_all.bbl file :

Use Betaflight BlackBox Explorer to check if your flight seems good :

• https://github.com/betaflight/blackbox-log-viewer/releases
  
• Download the betaflight-blackbox-explorer-installer_3.5.0_win32.exe file and install Betafligh BlackBox explorer
  
• You can now open the blackbox files and see your flight data.
  
• Prefer a long flight (3 minutes) without a crash.

• In the Select Model screen, put a model name, select your file, and launch the extraction process. The extraction process is a background task and will not freeze the game.
  
• The extraction process should take about 5 minutes, maybe 10 on weak CPUs. If it takes way longer for you, it's probably because the blackbox file contains multiple flights or higher than 500 Hz frequency. For now, neither multiple flights or higher frequencies are useful, you will only wait longer !
  
• If you wait in the Main Menu, the newly created model will be selected as the active selected model once the extraction is done.
  
• If you don't like to wait, you can fly your actual selected model during this time. Then when the extraction is done, you can go back to the Main Menu and select your newly created model in the "Select Model" screen.

• If the new model flies good, it's all good and you can fine-tune it if desired.
  
• If it flies crap, don't even bother tuning it, you should discard it and try from another log.