On Thursday 28 August 2003 02:37, Manuel Bessler wrote:
> I was wondering about one issue while messing with the <UNDERCARRIAGE>
> section of my 717 model:
> 
> the dxf drawings from Boeing show the nose gear at a slightly higher
> ground level than the main gear. Thus, when the real aircraft is on
> ground, the fwd part of the fuselage will have less ground clearance
> than the rear part.
> 
> I used those 3-view dxf drawings in blender to model the 3d model for my
> 717. 
> My question is: do I have to rotate the model in blender so that both
> nose and main gear are on the same level, or will jsbsim place the 3d
> model inside fgfs such that both nose and main gear will have ground
> contact ? Of course given the correct numbers in the <UNDERCARRIAGE>
> section (ie. shorter z-axis lenghts for the nose gear compared to main
> gear (my model's origin is the a/c nose))
> 
> Is my description clear enough to understand what I'm asking ?
> 
> 
> Regards,
> Manuel

I'm not very familiar with JSBSim so I don't know if it includes a gear 
compression factor.  This could be important when you set the gear up because 
it might assume, or you might have to tell it, whether the gear z-axis is a 
loaded or unloaded figure.

When I started animating u/c suspension I found that it's easier if you model 
the gear at it's unloaded extension i.e. it's position when the a/c is in the 
air and there's no weight on it.  If you're not going to animate the 
suspension then you should model the gear in it's loaded position other wise 
it'll stick through the ground while it's landed.

LeeE


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