VTOL Parameter Analysis
Review parameters by function, not as a giant undifferentiated export.
Start with airframe identity, then move through Q-mode settings, output functions, transition behavior, sensor assumptions, and return or failsafe logic.
Parameter groups worth isolating
Airframe identity
Vehicle type, firmware family, frame assumptions, and orientation must match the real aircraft before deeper review means much.
Q parameters
QuadPlane-specific parameters are grouped under the Q_ prefix and should be reviewed as a coherent lane instead of cherry-picked.
SERVO outputs
Output functions, min/max ranges, reversal, and which channels own motors, tilt servos, or tails are often more decisive than tune values.
RC mapping and flight modes
Receiver mapping, switch logic, and mode expectations must align with what the aircraft will actually do in hover and transition.
Transition and attitude control
Transition timing, forward-throttle use, angle limits, and rate or attitude behavior should be reviewed together.
EKF, compass, GPS, and failsafes
Heading trust, GPS usage, estimator health, and return behavior are safety-critical review lanes rather than afterthoughts.
How to read a parameter diff without fooling yourself
- Start with high-consequence setup differences before low-consequence tuning drift.
- Treat output ownership and orientation as first-order checks.
- Assume that geometry changes can make a “known-good” value unsafe on another airframe.
- Link every proposed parameter change to a bench-test step.
What the ArduPilot docs support clearly
QuadPlane parameters
ArduPilot documents that QuadPlane-specific parameters use the Q_ prefix, require Q_ENABLE=1, and depend on correct ESC and output range setup.
Estimator and compass assumptions
Compass setup and correct AHRS_ORIENTATION are foundational, and EKF3 is the normal state-estimation path in current ArduPilot documentation.
Use the page to shrink the diff into a bench plan
The goal of parameter analysis is not to sound technical. It is to decide what must be checked next, safely and in order.