Re: FDM coordinates

Thanks, now I get the idea...
Does that mean that AC_AERORP and AC_CGLOC should have the same coordinates?
And should the z value of both be a positive value so that the
aircraft is ABOVE the ground rather than IN the ground?


On 5/12/05, Erik Hofman <[email protected]> wrote:
> 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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-- 
Sam Heyman
Ryds Allé 13.109
58435 Linköping
Sweden
mob: +46(0)730 754 703

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