Innis Cunningham said: > Using the autopilot in the 737 yesterday all the modes seem to overshoot the > target be it heading,radial or altiitude. > The problem seems to be that the pid if it does look ahead does not take > action > untill the A/C has past the selected point. > Is the adjustment for this in the algorithm or the XML file or do we need > look ahead > properties in the property tree. > Also is this problem happening in the smaller A/C,172,310 and the like.If > not maybe > A/C speed is a factor. > This is what I see with the various modes > Heading:After the A/C acquires the new heading it oscillates around the > selected deg > by 1deg. > Altitude:It seems to hold altitude within about 10feet(could be considered > insignificent) > Radial:This seems to be the worst of the lot.It will overshoot the selected > radial by 10-20 > deg and then oscillate around the selected radial.If the new radial is any > greater than about > 50 deg from the current one the chances are that the A/C will not acquire > the new radial > at all even if the A/C is over 50 miles from the station. > This information is provided so what appears to be a good system can be fine > tuned to > operate the autopilot as near to real life as possible. >
Try the 747 autopilot. It is still a work in progress, but you will find that I've been attempting to solve some of these same problems. Best, Jim _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
