Re: FDM coordinates

Sam Heyman wrote:
> Hi,
> I am still having problems positionning the 3Dmodel with reference to
> the FDM model and defining the landing-gear.
> 
> Where is the origine of the FDM model? how do you get the 3D model and
> FDM model to have the same reference point?

It's up to you where to define the origin of the FDM model. You could 
specify it at the tip of the nose, at the CG or in the center-line at 
the fwd nozzle position.

> My aircraft is situated exactly at ground level, if I raise the 3D
> model by a few feet the model is offset from the FDM, causing it to
> act as if it were on a "stick" or a pendulum...

JSBSim now defines an AC_AERORP. This value is defined relative to the 
AC_CGLOC and is shared with the model 3d origin. So you specify the 3d 
model origin relative to the CG of the aircraft using AC_AERORP

Erik

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