Frame of reference for stability derivatives

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Cindy Chen

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Dec 13, 2025, 12:03:03 PM (4 days ago) Dec 13

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I was wondering which coordinate frame the stability derivatives in the .stab file are computed in. Is it the body axes, where the x-axis is aligned with the chord line, or the stability axes, where the x-axis is aligned with the freestream?

Rob McDonald

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Dec 13, 2025, 3:38:01 PM (3 days ago) Dec 13

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Fx, Fy, Fz, Mx, My, Mz are all in Body axes.

CL,CD,CS are in Wind axes.

All moments reported are in body axes.

Rob

Cindy Chen

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Dec 13, 2025, 3:57:59 PM (3 days ago) Dec 13

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Thank you!

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