> After noticing that the animation for the rudder, the elevator, the
> ailerons and the flaps are not working anymore, I dig into the code to
> find out that FlightGear expect normalized properties from JSBsim ( see
> FGJSBsim::copy_from_JSBsim ).
This was discussed at length in the JSBSim developer list, and I had meant
to pass this along with the FlightGear folks soone, but there's a lot going
on
right now. Here's the info from the JSBSim list:
+++
OK. Most of these ( e.g. FCS->GetDePos(ofNorm), and the associated -norm
properties ) will return zero now by default. In order to get the correct
value, one will need to create an aerosurface_scale FCS component to take
the surface position from absolute deflection (in degrees or radians) to one
mapped between the max and min deflection for the surface.
For instance, I just added this to the F-16 model:
<!-- ===============================================================
Component for Leading edge flap position, NORMALIZED for animation
Input: fcs/lef-pos-deg
Output: Component (output) value is normalized leading edge
flap position, mapping the LEF domain of
-2 to +25 degrees into a range of 0 to 1.
-->
<component name="LEF Pos Norm" type="AEROSURFACE_SCALE">
<input>fcs/lef-pos-deg</input>
<domain>
<min>-2</min> <!-- LEF actual minimum position -->
<max>25</max> <!-- LEF actual maximum position -->
</domain>
<range>
<min>0</min> <!-- LEF normalized minimum position -->
<max>1</max> <!-- LEF normalized maximum position -->
</range>
</component>
Note that no output component should be set, as there is no existing leading
edge flap property in JSBSim - the component name will be:
fcs/lef-pos-norm
This is what's expected by the aerodynamics functions. The technique should
also serve to
drive the 3D model correctly.
----
I hope this helps.
Jon
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