Norman Vine writes: > >Interesting. I've seen the problem consistently for quite a few > >months (the AP holds the DG about 10 deg off the heading bug). > > Yep this changed recently. > > It is almost as if the magnetic deviation is being added in twice ?? > I haven't really checked into this though
I took a quick peek this morning. I think the autopilot and heading values are correct. What I'm seeing (and this behavior did change recently) is that the JSBSim C172 now requires significant right aileron/rudder to hold straight level flight, even at full throttle, full speed, level flight. Even in a descent I see a lot of turning force and need to compensate with right rudder/aileron to maintain a straight path. The autopilot heading hold is just 'proportional' so it assumes that neutral controls correspond to straight flight and slight offset's either way will produce a slight turn in that direction. So, if there is constant left turn bias, the autopilot heading hold will never quite get there. At full throttle level flight with the JSBSim C172, the closest I can get is about 3 degrees off the desired heading. The error is much bigger in a climb. Note that the YASim C172 doesn't have this same effect and the autopilot holds the heading well for it. So, I hearby decree that this is a problem with JSBSim (or at least the JSBSim C172 model) and not the autopilot or FlightGear or recent property manager changes. Regards, Curt. -- Curtis Olson IVLab / HumanFIRST Program FlightGear Project Twin Cities [EMAIL PROTECTED] [EMAIL PROTECTED] Minnesota http://www.menet.umn.edu/~curt http://www.flightgear.org _______________________________________________ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
