That is why the model code does not need to know where the CG is. The 3D model designer does need to know the FDM "origin" or "reference point" or whatever you want to call the vertex in space at which the FDM reports the lon/lat/alt of the aircraft. So if she puts the origin of the model (0,0,0) in that place, the 3D model will rotate correctly.
Thanks -- your explanation and Jon's has made it all clear, and the discussion has been useful. So, as far as I understand, JSBSim supports this in JSBSim CVS but not yet in FlightGear. Does YASim support setting the reference point yet?
All the best,
David
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