> > That's probably an issue with the autopilot and the 747. It's been difficult > finding control factors that work for all the different speeds, compounded by > the giant mass of the 747. At those lower speeds the effectiveness of the > elevator can change dramatically with relatively small changes in speed.
Errr, I don't think so. Not using the FG autopilot, and I see nothing in my FMC that would send a control command for up elevator. In fact, the FMC continues to issue a reference vertical velocity speed between 720 and 760 fpm descent which is what it was calculating at glideslope capture at the outer marker and during the approach. There is nothing in the way of a control command input, the approach is rock solid both in glideslope and localizer tracking all the down. Plus there's no reason for the aircraft to suddenly pitch up when neither the state or control surface deflections change. > In any case the AGL doesn't affect the autopilot in its normal modes. If you > were hearing tire screech at 200ft or it behaved differently depending on the > airport, that would be a different story. > When I have a moment I'll try a few approaches at other airports. Don't have sound enabled. And taker a closer look at a plot of FMC output and control surface movements. I've put this one on the back burner for the moment. Regards John W. _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
