Flight Options¶
FLIGHT_OPTIONS is a bitmask that allows configuring several alterations to Plane’s behavior.
Function |
|
|---|---|
0 |
Allows rudder input to be used in only MANUAL,STABILIZE,and ACRO modes. In other modes, rudder input mixing is controlled by the STICK_MIXING parameter. |
1 |
Forces center throttle stick to be AIRSPEED_CRUISE instead of midway between AIRSPEED_MAX and AIRSPEED_MIN when using an airspeed sensor in FBWB and CRUISE modes. |
2 |
Disable the attitude checks for AUTOTAKEOFF and TAKEOFF mode start which must be less than +/-30 degrees roll and 45 degrees pitch. |
3 |
Forces target airspeed to AIRSPEED_CRUISE in CRUISE and FBWB modes when airspeed sensor is being used, ignoring throttle stick position. |
4 |
Climb to RTL_ALTITUDE altitude before turning toward home in RTL |
5 |
Enable Yaw Damping Controller to be active in ACRO mode |
6 |
Suppress speed scaling during auto takeoffs to be 1 or less to prevent oscillations when not using an airspeed sensor. |
7 |
Enable default airspeed EKF fusion for takeoff (Advanced users only) |
8 |
Remove PTCH_TRIM_DEG offset on the GCS horizon to show pitch relative to AHRS trim (ie the attitude at which the autopilot was calibrated,unless manually changed) |
9 |
Remove PTCH_TRIM_DEG on the OSD horizon to show pitch relative to AHRS trim (ie the attitude at which the autopilot was calibrated,unless manually changed) |
10 |
Adjust mid-throttle to be TRIM_THROTTLE in non-auto throttle modes except MANUAL,instead of midway between MAX and MIN stick values (note that the RCx_TRIM value for the throttle channel (x) MUST BE set to center stick value) |
11 |
Disable suppression of fixed wing rate gains in ground mode |
12 |
Enable FBWB style loiter altitude control if STICK_MIXING is enabled |
Default is no options enabled (“0”). Setting the bit will enable that function. For example, if forcing target airspeed in FBWB and CRUISE modes is desired, a value of “8” (bit 3 =1) would be set.
Note
Normally, PTCH_TRIM_DEG is subtracted from the AHRS pitch so that the artificial horizon shows pitch as if the autopilot was calibrated with aircraft level position set at PTCH_TRIM_DEG instead of flat. This normally results in the artificial horizon indicating 0 pitch when in cruise at desired cruise speed. PTCH_TRIM_DEG is the pitch trim that would be required in stabilized modes to maintain altitude at nominal cruise airspeed and throttle, and for most planes is 1-3 degrees positive, depending on the aircraft design (see Tuning Cruise Configuration).