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STABILITY AXES Fs (Osxsyszs)
Stability axes are a special set of body axes used primarily in the study of small disturbances from a steady reference flight condition. If the reference flight condition is symmetric, i. e., if V lies in the plane of symmetry, then Fs coincides with the wind axes Fw in the reference condition, but departs from it, moving with the body, during the disturbance. If the reference flight condition is not symmetric, i. e. with sideslip, then 0sxs is chosen to lie on the projection of У in the plane of symmetry, with 0szs also in the plane of symmetry.
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Fig. 4.8 Notation for body axes. L = rolling moment p = rate of roll M = pitching moment q — rate of pitch N ~ yawing moment r — rate of yaw [X, Y, Z] = components of resultant aerodynamic force [u, v, w = components of velocity of G relative to atmosphere |
