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252 Aeronautical Engineer’s Data Book
Table A3.3 Longitudinal aerodynamic control derivatives
Small perturbation derivatives referred to aircraft wind axes
Derivative Description Expression Comments
X
Axial force Usually
S T
due to – 2 k T C L T 2 insignificantly
a
elevator S small
Z
Normal
S T
force due – a 2
to elevator S
M
Pitching – V� T a 2 Principal
moment measure of
due to pitch control
elevator power
