Jon S Berndt writes:
>
>On Fri, 26 Apr 2002 13:10:21 -0500
> Michael Selig <[EMAIL PROTECTED]> wrote:
>>
>>Pertaining to the question about where the target spot is
>>located, i.e. what the viewer code uses as the "reference
>>point" for centering the model on the screen. This point
>>should be the aircraft c.g. The reason is that it is
>>about this point that the FDM's define the aircraft
>>orientation, and I presume that it is this orientation
>>information that the viewer code uses to position the
>>aircraft/view. For external views, the center should not
>>be the pilot's eye.
>
>Yes. The one foggy point in my mind is what problems (if
>any) might be associated with a floating CG (i.e. from
>fuel burnoff, etc.).
Jon
IMHO You need two (2) CG's.
1) the 'reference' < static > CG usually determined from manufacturer
specs or something similar for use in FGFS for reference purposes.
2) The 'actual' < dynamic > CG of the aircraft, as determined by vehicle
loading for use in the FDM
Think of (1) above as the 'local origin' of the aircraft frame and think
geometry
not gravity. Although I believe that having this the same as the 'Center of
Gravity'
as described in the manufacturer specs is a GOOD idea.
What the FDM does to (2) FGFS doesn't really care about.
But (1) must be made available at startup time and remain constant
Norman
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