Abstract
The limit of a human pilot's capability in controlling an unstable second-order system with positive static stability is theoretically investigated. A modified expression is proposed for the transfer function of a human pilot who is aware of the dynamic characteristics of the system. His controllability limit is analyzed by use of the modified transfer function and servomechanism theory. The theoretical results thus obtained are compared with experimental results. The physical interpretation of the theoretical results in connection with experimental results shows good insight into the controllability limit of a human pilot. Nomenclature 7p($) = transfer function of human pilot Yc(S) = transfer function of control system YA(S) = transfer function of controlled element S = Laplace transform operator Kp = human pilot gain
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