search

falcon71 / kln90b

KLN 90B for MSFS
GNU Lesser General Public License v3.0
43 stars 2 forks source link

The autopilot deviates to the inside of DME arcs #21

Closed falcon71 closed 5 months ago

falcon71 commented 5 months ago

The autopilot seems to deviate to the inside of DME arcs when in the middle of the arc:

lgsr

Is this caused by the KLN?

falcon71 commented 5 months ago

The problem are the SimVars GPS WP TRUE BEARING and GPS WP BEARING. I set them to the bearing to the next waypoint (KORAX) as it is described in appendix A in the manual. Apparently, the autopilot uses this variable as well and it seems confused by the mismatch between GPS WP DESIRED TRACK AND GPS WP BEARING. If I set the bearing values to the desired track in an arc, the autopilot flies the DME arc precisely. The problem is, that this would not be correct based on appendix A. This would become evident, if an aircraft author chooses to display the GPS bearing on an RMI.