RE: CG placing

> Hi!
>
> Just have a quick question:
> How do you position the CG of the aircraft with reference to the outside
> world?
> i.e. the height from the runway...
>
> for exemple the fokker 100 has its CG at AC_CGLOC     627.4  0.0 -16.5,
> but this is in the a/c reference.
> Is it the undercarriage that  places the CG in the real world?
>
> Thanks, Sam

It might help if you see the first "Back of the Envelope" newsletter at the JSBSim web
site.

Additionally, the landing gear coordinates specify the location of the gear in the
aircraft frame. If you know the location of the CG and the landing gear both in aircraft
coordinates, you can take the difference and know how far below the CG the landing gear
extend. If you are at sea level, and you set the altitude of the aircraft at 5 feet, and
the gear hang down 3 feet below the CG, then the aircraft will fall two feet and hit
ground. The altitude value corresponds to the altitude of the CG.

I hope this helps.

Jon



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