ROTORFLIGHT - Guide to Blackbox PID Trace Analysis

Helicopters • Airplanes • Drones • Builds • Repairs • Consulting • 3D Printing

Visual/Audible Identifiers:

• Sounds of "waivering" or "pulsing" motor and/or gear noise as the helicopters spools up and/or hovers.
• Vibration of the airframe or tailboom at hover.
• High speed oscillation of the tail (almost looks "nervous") due to pulsing.

Notes:

• We won't be covering this topic (filters) as part of the tuning guide (as there are no P-to-D term ratios that pertain here.
• Please see Jonas' video (in our "Useful Links" section located on the left navigation pane) for proper filter setup.

Comments:

• Notice the ample amounts of oscillations on all axis (roll, pitch, yaw).

Comments:

• Notice the heavy presence of oscillations from the previous image have pretty gone.
• You can now properly analyze the Gyro to Setpoint relationship for P:D tuning.

Conclusions:

• No major to conclusions to add here except to make sure to run properly setup filters: Low Pass, Notch, Main Rotor (up to 4th harmonic), and Tail Rotor (up to 2nd harmonic).