Re: aerodynamic variables for Datcom

Hi Sam,

Sam Heyman wrote:
> Does anyone know where the aerodynamic variables for the FDM file are 
> located. (JSBSim)
> These variables include:
> --> aero/qbar-psf|metrics/Sw-sqft
> --> aero/qbar-psf|metrics/Sw-sqft|aero/cl-squared-norm
> etc...
> 
> I am entering all the Datcom data into the FDM file and I need to create 
> a new section for, for exemple, the Lift_due_to_alpha_rate, as it is not 
> present in my file.
> I have started with:
> 
> <COEFFICIENT NAME="CLadot" TYPE="VECTOR">
>       Lift_due_to_alpha_rate
>       14
>       aero/alpha-rad
>       aero/qbar-psf|metrics/Sw-sqft|fcs/.....???......
>       -0.087       0.796
>         0.0           0.791
>          .......
> </COEFFICIENT>
> 
> I need to name the output variable CLalphadot. Anyone know how to access 
> it and/or rename it?

Do you work under UNIX?
If so, the easiest way is to do a grep in the aircraft directory of JSBSim:

grep adot */*


This shows that the c172p has this defined already:

<COEFFICIENT NAME="CLadot" TYPE="VALUE">
   Lift_due_to_alpha_rate
   aero/qbar-psf | metrics/Sw-sqft | aero/alphadot-rad_sec | aero/ci2vel
   1.7
</COEFFICIENT>

You can use any NAME you liek, so NAME="CLalphadot" is no problem.

Erik

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