COMPARISON OF LONGITUDINAL STABILITY CHARACTERISTICS OF THREE TILT-WING VTOL AIRCRAFT DESIGNS
PRINCETON UNIV NJ DEPT OF AEROSPACE AND MECHANICAL SCIENCES
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Experimental values of the longitudinal stability derivatives of three tilt-wing VTOL aircraft configurations as obtained from tests of several models are presented. Results from the NASA full-scale wind tunnel at Langley Field, the Princeton track, the LTV Aerospace Corporation wind tunnel and flight test are included. An analysis is included which utilizes root-locus and analog computer studies to compare the characteristic roots and transient response of the aircraft as the longitudinal derivatives are varied within the range exhibited by these data. Trim conditions at wing incidences from 20 to 90 degrees are considered. The three configurations included in the analysis were found to exhibit quite similar stability characteristics in the low-speed regime. Good correlation was found to exist between NASA wind tunnel data and Princeton Dynamic Model Track data for the VZ-2 aircraft. Consideration is given to the importance of various derivatives in determining the response characteristics. A large number of analog computer traces are included, showing variations in response characteristics caused by changes in individual derivatives.
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