An analytical study was made of an optimal gust alleviation system that employs a vertical gust sensor mounted forward of an aircraft's center of gravity Frequency domain optimization techniques were employed to synthesize the optimal filters that process the corrective signals to the flaps and elevator actuators Special attention was given to evaluating the effectiveness of lead time, that is, the time by which relative wind sensor information should lead the actual encounter of the gust The resulting filter is expressed as an implicit function of the pre¬scribed control cost A numerical example for a light wing-loading STOL aircraft is included in which the optimal trade-off between performance and control cost is systematically studied.
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