If horizontal-tail area is increased by 20% and its moment arm is reduced by 20%, find the ratio of the new tail contribution to longitudinal static stability to its original value (two decimal places).
With other aerodynamic factors fixed, the tail contribution scales with tail volume, proportional to tail area times its moment arm. Its ratio is 1.20×0.80=0.96. The percentage changes multiply rather than cancel by simple addition.
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