EKF: Update comments for wind estimation logic

EKF/control.cpp

@@ -877,11 +877,10 @@ void Ekf::controlAirDataFusion()
 {
         // control activation and initialisation/reset of wind states required for airspeed fusion
 
-        // If both airspeed and sideslip fusion have timed out then we no longer have valid wind estimates
+	// If both airspeed and sideslip fusion have timed out and we are not using a drag observation model then we no longer have valid wind estimates
         bool airspeed_timed_out = _time_last_imu - _time_last_arsp_fuse > 10e6;
         bool sideslip_timed_out = _time_last_imu - _time_last_beta_fuse > 10e6;
 	if (_control_status.flags.wind && airspeed_timed_out && sideslip_timed_out && !(_params.fusion_mode & MASK_USE_DRAG)) {
-                // if the airspeed or sideslip measurements have timed out for 10 seconds we declare the wind estimate to be invalid
 		_control_status.flags.wind = false;
 
 	}
@@ -911,7 +910,7 @@ void Ekf::controlBetaFusion()
 {
 	// control activation and initialisation/reset of wind states required for synthetic sideslip fusion fusion
 
-	// If both airspeed and sideslip fusion have timed out then we no longer have valid wind estimates
+	// If both airspeed and sideslip fusion have timed out and we are not using a drag observation model then we no longer have valid wind estimates
 	bool sideslip_timed_out = _time_last_imu - _time_last_beta_fuse > 10e6;
 	bool airspeed_timed_out = _time_last_imu - _time_last_arsp_fuse > 10e6;
 	if(_control_status.flags.wind && airspeed_timed_out && sideslip_timed_out && !(_params.fusion_mode & MASK_USE_DRAG)) {