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DESIGN of stable turboprop control systems is greatly speeded up by the WAC electronic analog. This computing device simulates the physical relationship between the five prime variables involved: speed, torque, temperature, fuel flow, and propeller blade angle. Although as many as 25 design characteristics may be involved in a control system, the analog can determine the optimum values for them in the course of one day. The analog computing technique might be equally valuable in a number of other uses.
Philbrick et al. (Thu,) studied this question.