Experimental Flight Methods for Evaluating Frequency-Response Characteristics of Aircraft

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Abstract
This paper deals mainly with methods and techniques for obtaining airplane frequency-response characteristics from transient flight measurements. After a review of the basic airplane equations of motion, the theoretical transfer function which defines the “short-period” pitch response to an elevator deflection is derived. A numerical example is used to illustrate the evaluation of an analytical transfer function from a graphical frequency response by a method which involves the use of graphical aids in conjunction with an analog computer. Finally, the effects of variations in flight speed and altitude on the airplane response are considered.

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