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Plane: improved fwd throttle during VTOL landing
this sets up the vwd integrator more reasonably when we are in POSITION1 stage of VTOL landing. We need to have enough throttle to cope with a headwind, but want it lower when we are at or above our target closing speed so can minimise the amount of pitch up This also makes the landing_desired_closing_velocity() consistent with the landing speed used in approach, using average of airspeed min and cruise speed if TECS_LAND_ARSPD is not set The target airspeed for TECS during airbraking is now set to ARSPD_FBW_MIN, on the basis we are trying to slow down to min speed, and we have VTOL support which should prevent a stall. To cope with a high headwind where ARSPD_FBW_MIN is below the headwind we now check for too low achieved closing speed and switch to POSITION1 which can use vfwd to get to the landing location
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