stability derivatives

[pinguinovikingo]

Hi everyone.

I'm working in a recreational proyect. I have used a CFD (Tornado) to calculate the stability derivatives of a small aircraft.

The point is, the CFD software provides me the stability derivatives in wind-axis (stability-axis) but I need them in body axis. do you know they way (or expression) to convert to those axes?

for example I want Cxu but I have Cxalpha and Cxbetha... How I get Cxu from Cxalpha and Cxbetha??? (and the others components Cxv Cxw Cxq Cxp Cxr Cyu... Czu... Clu... Cmu... Cnu...Cnr)

thank you

 

[GregLocock]

http://mathworld.wolfram.com/Transformation.html

you are interested in rotational transformations.

They are easy to derive if one axis of the three is parallel in the two coordinate systems.

Cheers

Greg Locock


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[GregLocock]

http://mathworld.wolfram.com/RotationMatrix.html

is more directly relevant.

Cheers

Greg Locock


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