Find dangerous VTOL setup problems before the next flight.
Arimota helps ArduPilot QuadPlane and fixed-wing VTOL builders review Mission Planner parameter files, compare a known-good aircraft to a problem aircraft, and follow a props-off bench process before flying again. This is a safety-first troubleshooting site, not a cosmetic diff tool.
VTOL can forgive very little setup error.
VTOL adds more moving parts to the flight problem.
One aircraft has to hover, switch to forward flight, and stay stable during the handoff. That makes motor direction, servo direction, tilt angles, and controller setup more critical than on a simple plane.
Modern hardware made VTOL easier to build, not easier to set up.
Flight controllers and electric systems made smaller VTOL projects practical for more builders. The need for careful setup and bench testing never went away.
Autopilots only help when the aircraft is configured correctly.
ArduPilot can do a lot, but it still depends on correct orientation, output functions, servo direction, sensor setup, and failsafes. One bad assumption can hide inside an otherwise normal-looking file.
Good troubleshooting starts on the bench, not in the air.
The safest path is to compare known-good and problem aircraft, isolate the risky differences, and verify the real hardware with props removed before trusting another launch.
Clear the setup basics before changing gains.
Airframe layout
Confirm whether the aircraft is tilt-rotor, tilt-wing, tailsitter, or lift-plus-cruise. The layout changes what “correct” looks like.
Motors, servos, and tilt angles
Verify the motors spin the right way, the servos move the right way, and the tilt angles are physically correct before blaming the tune.
Controller orientation and modes
Check the flight controller orientation, expected flight modes, and whether the aircraft knows when and how to switch from hover to forward flight.
Sensors and state estimate
Review GPS, compass, accelerometer, and what the flight controller thinks the aircraft is doing. A bad estimate can quietly break an otherwise decent setup.
Radio setup and pilot inputs
Make sure the receiver mapping, mode switches, and pilot expectations match what the aircraft will really do in hover and transition.
Props-off validation
Test everything with props off before flying: output channels, control direction, tilt movement, and failsafe behavior.
Start with the symptom, then clear the likely causes safely.
When a VTOL pitches forward, drifts hard in hover, or fails during transition, start with the setup basics instead of spraying tuning changes everywhere. Compare the problem aircraft to a known-good aircraft when you can, then clear the highest-risk checks first.
- Start with a problem-aircraft parameter file and add a known-good file when available.
- Confirm the airframe type, firmware version, and expected motor and servo layout.
- Check controller orientation, motor order, servo direction, and output channels with props removed.
- Review transition, VTOL, attitude, and failsafe settings in grouped lanes.
- Make a short change list instead of copying large blocks of settings.
- Bench test every critical change before any careful hover or transition retest.
Likely causes: wrong controller orientation, wrong motor order, reversed servo, bad tilt geometry, or the wrong output channel.
Remove props. Confirm motor order, servo direction, tilt direction, and flight-controller correction direction before another flight.
Review when the aircraft changes modes, how far it tilts, and whether airspeed or assist settings match the aircraft.
Change one group at a time, verify the fix on the bench, and only then move to a careful hover or transition test.
Choose the review path that matches the files you have.
Parameter tool and comparison dashboard
Use the parameter tool when you only have one Mission Planner export. Use the comparison dashboard when you have two similar aircraft and one of them is already flying well.
Upload one .param or .parm file and see the highest-risk setup problems first.
Compare a problem aircraft to a known-good aircraft and focus on the differences that may affect safety.
Review the file, isolate the likely causes, bench test with props off, and only then retest.
The tools help you spot dangerous setup issues before another flight attempt.
Jump straight to the section you need
Use the anchor links below for the background material, then move to the live tools when you are ready to compare files or audit a setup.
Treat every configuration change as flight-safety work.
VTOL parameter changes can cause loss of control, property damage, or injury. Back up the file, change one group at a time, test motor and servo outputs with props off, verify failsafes, and make the next flight a controlled retest in a safe area.
Ready to review a specific VTOL setup?
Start with the parameter tool when you have one Mission Planner export. Open the comparison dashboard when you also have a known-good reference file. Both routes keep the work grounded in a bench-first review.
Start with props off, keep the changes small, and use the next flight only as a careful retest.