>
> > I would need:
> > CLtail = f(alpha_tail, delta_elevator)
> >
> > where alpha_tail = alpha_aircraft + horizontal_stab_angle - Epsilon
>
>
> src/jsbsim --aircraft=c172x --catalog
>
> The --catalog option will give you a list of all the properties that JSBSim
> defines and knows about. That is separate from FlightGear-specific
> properties that are part of the *interface* between FlightGear and JSBSim.
> JSBSim does have its own elevator deflection property. I don't understand
> the issue with the 747 model, and (unfortunately) I don't have time to look
> into it at the moment.
>
> Jon
>
I am not talking about the elevator property, but about the horizontal
stabilizer (HS)property, which seems to be missing in JSBSim. In most
airliners and bussiness jets there is an all-moving HS, together with
the elevator (and maybe also a trim-tab). Then I would need to refer
to the HS current deflection (which the pilot changes in order to trim
the aircraft pitching moment) in order to calculate the tail angle of
attack : alpha_ac + HS - Epsilon.
Here is the relevant part of the 747.xml as defined in the aircraft
subdirectory that ships with JSBSim package.
1. Note that: <description>Lift_due_to_stabilizer_deflection</description>
2. But: <property>fcs/speedbrake-pos-rad</property>
3. My question is: why it uses "speedbrake"?
<function name="aero/coefficient/CLs">
1. See here ---> <description>Lift_due_to_stabilizer_deflection</description>
<product>
<property>aero/qbar-psf</property>
<property>metrics/Sw-sqft</property>
2. and here ---> <property>fcs/speedbrake-pos-rad</property>
<table>
<independentVar>velocities/mach</independentVar>
<tableData>
0.0000 0.8190
0.2000 0.7850
0.6500 0.7390
0.9000 0.8590
</tableData>
</table>
</product>
</function>
Fabian
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