Re: [Jsbsim-devel] Jsbsim-devel Digest, Vol 136, Issue 3

[Erik H. <er...@eh...>]

On 12/01/2017 04:00 PM, Marta Marimon wrote:
> Hi Sean,
> 
> Thank you very much for your clarifications. That is exactly what I have 
> just realised, DRAG/SIDE/LIFT in wind axes, X/Y/Z in body axes, being 
> body and wind axes related through both alpha and beta rotations, and 
> then AXIAL/SIDE/NORMAL in body axes but being AXIAL = -X and NORMAL = -Z.
> 
> So my assumption was wrong. There is no option for stability axes. It 
> would actually be good to be able to input the aerodynamic data in 
> stability axes since usually from wind-tunnel testing the data is in 
> stability axes. Another important aspect to note, as stated in line 220 
> of FGAerodynamics.cpp, is that DRAG and LIFT values are positive up and 
> aft (wind axes rotated 180deg about Y-axis).

According to the docs there X, Y and Z should be the stability axes:
http://jsbsim.sourceforge.net/JSBSimCoordinates.pdf

If not I guess it's a bug.

Erik

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