Re: [Flightgear-devel] Slew problem with Concorde and other JSBsim aircraft nearly solved
Olaf Flebbe wrote: Him If I remember correctly, Aerotro discovered these kind of bugs have been only in the WIndows/plib code (both in the build 1 supplied by Fred Bouvier and a build I offered a few weeks before). The OSG build seems to be fine. So I would suggest: The plib branch is broken. Cheers, Olaf Hey folks. It's time for me to be em-bare-assed. The pointmass problem was real... for an older version of the source (an issue for which I must have skipped the discussion). My problem wasn't that I had out-of-date source but that I wasn't getting my newly built executable in the right place. VC8 provides for post-build actions, such as copying your new executable to the proper place. I had studiously set that feature up to copy the exe to a stale directory. Please accept my apologies for wasting your time. -- Reagan Thomas CEAT Labs 323 Engineering North Oklahoma State University (405) 744-5735 - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
[Flightgear-devel] Slew problem with Concorde and other JSBsim aircraft nearly solved
I spent a few hours today trying determine what was causing the Concorde model to slew around on the ground in an erratic way as reported previously by Aerotro. I believe I have gotten very near to the root of the problem. First some info: 1. Aerotro noticed this problem when she began using the Win32 plib build fgfs-plib-win32-20070528.zip obtained from ftp://ftp.ihg.uni-duisburg.de/FlightGear/Win32/ 2. This morning I made a fresh Win32 OSG build from CVS head and was able to reproduce the problem on the B707, Concorde, E3B and KC135. The problem did *not* occur with the 747-100, so I compared its FDM to that of the Concorde and others. I discovered that the 747 has a pointmass definition in the mass_balance block that the problematic craft do not. I verified that by removing the pointmass definition, the 747 starts skipping and sliding too. I further verified that by adding a pointmass to the Concorde FDM as below it stopped misbehaving: pointmass name=name weight unit=LBS 1 /weight location name=POINTMASS unit=IN x 1455 /x y 0 /y z -39 /z /location /pointmass I set the weight to 1 Lb to verify that the actually amount of mass had no direct bearing on the base problem. -- Reagan Thomas 323 Engineering North Oklahoma State University - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Slew problem with Concorde and other JSBsim aircraft nearly solved
Reagan Thomas wrote: I spent a few hours today trying determine what was causing the Concorde model to slew around on the ground in an erratic way as reported previously by Aerotro. I believe I have gotten very near to the root of the problem. First some info: 1. Aerotro noticed this problem when she began using the Win32 plib build fgfs-plib-win32-20070528.zip obtained from ftp://ftp.ihg.uni-duisburg.de/FlightGear/Win32/ 2. This morning I made a fresh Win32 OSG build from CVS head and was able to reproduce the problem on the B707, Concorde, E3B and KC135. The problem did *not* occur with the 747-100, so I compared its FDM to that of the Concorde and others. I discovered that the 747 has a pointmass definition in the mass_balance block that the problematic craft do not. I verified that by removing the pointmass definition, the 747 starts skipping and sliding too. I further verified that by adding a pointmass to the Concorde FDM as below it stopped misbehaving: pointmass name=name weight unit=LBS 1 /weight location name=POINTMASS unit=IN x 1455 /x y 0 /y z -39 /z /location /pointmass I set the weight to 1 Lb to verify that the actually amount of mass had no direct bearing on the base problem. From discussions in IRC, this appears to be a Windows-only problem. Vivian, also on Windows and using the same compiler and nearly same VC8 project files (derived from Olaf's files found here: http://www.oflebbe.de/oflebbe/FlightGear/index.html), has not been able reproduce this problem. The Linux users report no such problems. I invite any interested Windows users to try one of the recent Win32 builds from the ftp site mentioned above... if only to prove that I am or am not insane ;) -- Reagan Thomas - This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
