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Fig. 2. Definition of the state variables u, w, q and
. Each of the
variables is signed positive in the direction shown. The body axes are centred
upon the centre of mass and are aligned so that the x-axis points in
the direction of flight at equilibrium. The locust is shown during a nose-up
perturbation: q is zero at equilibrium, and w and
are defined so as to be zero at equilibrium.
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