The VTOL forward-throttle control is not at its minimum
What ArduPilot says:
- PreArm: VTOL Fwd Throttle is not zero
A transmitter channel has the function VTOL Forward Throttle (RCn_OPTION 209): it drives the QuadPlane's forward motor by hand in the VTOL modes. At the moment of arming it reads more than 2% above its minimum, so the forward motor would start at once. The test is made when RC_OPTIONS bit 5 (arming check throttle) is set.
What to do, most likely first
The slider or knob is not fully down.
FixMove it to its minimum and arm again.
That channel's calibrated minimum is lower than what the control really gives.
CheckAt its lowest position the channel's bar in the Radio Calibration screen should read its
RCn_MIN.FixCalibrate the radio again, moving that control through its whole travel.
Parameters to look at
| Parameter | What it is |
|---|---|
RC_OPTIONS | RC options |
RC6_OPTION | RC input option |
RC7_OPTION | RC input option |
RC8_OPTION | RC input option |
RC9_OPTION | RC input option |
The code that sends it
PreArm: VTOL Fwd Throttle is not zero
libraries/AP_Arming/AP_Arming.cpp AP_Arming::rc_arm_checks() · Open in ArduPilot Copter-4.7.1