RE: [Flightgear-devel] minor nits
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
Re: [Flightgear-devel] minor nits
On Mon, 25 Mar 2002 09:26:47 -0600 (CST) Curtis L. Olson [EMAIL PROTECTED] wrote: What I'm seeing (and this behavior did change recently) is that the JSBSim C172 now requires significant rightaileron/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. great ... 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. Does the same thing happen with the X-15 or C-182? Jon ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] minor nits
On Mon, 25 Mar 2002 12:15:56 -0600 (CST) Curtis L. Olson [EMAIL PROTECTED] wrote: Jon asked: Does the same thing happen with the X-15 or C-182? The effect is there with the C182, although maybe just a tiny bit less. I don't see the effect at all with the X-15. That probably points to the JSBSim engine/prop model, right? Curt. It's hard to say. I don't think we've changed those things much. The last change was related to the separation of ailerons into left and right sides to support visual effects. All I have at this point is a JSBSim installation; I still have some rearranging to do with my computer systems at home before I can get a whole FlightGear setup running again. Jon ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
RE: [Flightgear-devel] minor nits
David Megginson writes: Curtis L. Olson writes: I'm noticing some feet/meter problems as well. I also noticed that --altitude= on the command line was giving me meters rather than feet. Could this be a side effect of the property manager overhaul? I'm not sure what else has changed recently that could be related. I think so -- I'm going to take a look at options.cxx right now. The altitude value seems to be in feet but it is saying it is meters also I notice that the autopilot readout in the HUD starts off in feet but changes to meters as soon as you adjust it - The heading hold seems to hold 5-10 degrees 'left' of the heading bug location. This also is recent addition. No, this has been a problem for at least six months. No, the problem has become 5-10 degrees worse in the past couple of days. 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 FWIW in all of the above I am comparing anything in the CVS after March 20 with what was there as of March 2, the last time I 'CVS up'ped a backup FGFS source tree HTH Norman ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
Re: [Flightgear-devel] Minor nits
D Luff wrote: And now NaN (Not-a-Nit) :-) the new engine starting sounds are excellent. Great stuff whoever came up with those. (Erik?) Yep. Thanks! Erik ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
re: [Flightgear-devel] minor nits
Curtis L. Olson writes: Here's a couple things that have surfaced after the recent rewrites: - The AGL instrument on the default HUD appears to now be in meters. Altitude is still in feet. If you pop on the hud and assume the agl is in feet, you will be way off ... this should get switched back. I'm noticing some feet/meter problems as well. I also noticed that --altitude= on the command line was giving me meters rather than feet. - The heading hold seems to hold 5-10 degrees 'left' of the heading bug location. This also is recent addition. No, this has been a problem for at least six months. All the best, David -- David Megginson [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
re: [Flightgear-devel] minor nits
David Megginson writes: Curtis L. Olson writes: Here's a couple things that have surfaced after the recent rewrites: - The AGL instrument on the default HUD appears to now be in meters. Altitude is still in feet. If you pop on the hud and assume the agl is in feet, you will be way off ... this should get switched back. I'm noticing some feet/meter problems as well. I also noticed that --altitude= on the command line was giving me meters rather than feet. Could this be a side effect of the property manager overhaul? I'm not sure what else has changed recently that could be related. - The heading hold seems to hold 5-10 degrees 'left' of the heading bug location. This also is recent addition. No, this has been a problem for at least six months. No, the problem has become 5-10 degrees worse in the past couple of days. 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
re: [Flightgear-devel] minor nits
Curtis L. Olson writes: I'm noticing some feet/meter problems as well. I also noticed that --altitude= on the command line was giving me meters rather than feet. Could this be a side effect of the property manager overhaul? I'm not sure what else has changed recently that could be related. I think so -- I'm going to take a look at options.cxx right now. - The heading hold seems to hold 5-10 degrees 'left' of the heading bug location. This also is recent addition. No, this has been a problem for at least six months. No, the problem has become 5-10 degrees worse in the past couple of days. Interesting. I've seen the problem consistently for quite a few months (the AP holds the DG about 10 deg off the heading bug). All the best, David -- David Megginson [EMAIL PROTECTED] ___ Flightgear-devel mailing list [EMAIL PROTECTED] http://mail.flightgear.org/mailman/listinfo/flightgear-devel
