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
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