Control derivative interpretation

[Violet Philip]

Hello everyone. I have a question concerning control derivative interpretation. Is the Stab file (wrt ConGrp per rad) gives  C(δ) or   ΔC(δ)

Are the control derivatives tables meant to be absolute coefficient values at each deflection or incremental changes?

[Rob McDonald]

The table at the bottom of the file are derivatives.

e.g.

d CFx / d Alpha = -0.43956

All of the derivatives are centered about the supplied run condition.  So, if you're running at Alpha=5deg, then this is the derivative at 5deg.

Likewise for control surfaces.  It is customary to run them with zero initial deflection, but I believe you don't have to.

Rob

[Violet Philip]

Thank you, Rob for the reply.

Violet

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