An Analytic Study of Various Factors Influencing the Longitudinal Stability Derivatives of a Typical Tilt-wing VTOL Aircraft PDF Download
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Author: Goro Beppu
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Category :
Languages : en
Pages :
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Author: Goro Beppu
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: G. Beppu
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Category :
Languages : en
Pages : 108
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An analytical method for predicting the stability characteristics of tilt-wing VTOL aircraft in the transition speed range is presented. Sample calculations based on an assumed tilt-wing VTOL transport configuration of the XC-142A class with double slotted flaps are given. Particular emphasis is placed on the sensitivity of the results to various assumptions made in the analysis. The contributions of the various aircraft components and the aerodynamic interactions of the components to the stability derivatives are discussed, as well as the changes in the characteristic modes of motion of the vehicle that result from variations in the stability derivatives. The trim conditions of the vehicle are shown to be quite sensitive to the prediction of the flap characteristics. A limited comparison of the calculated results with experimental data obtained from a dynamic model of the XC-142A, which is somewhat dissimilar from the assumed configuration, is presented. This comparison indicates that the trends of the stability derivatives are correctly predicted. The agreement between theory and experiment is good in hovering; however, as the wing incidence is reduced, the difference between theory and experiment becomes quite large. (Author).
Author:
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Category : Aeronautics
Languages : en
Pages : 960
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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: United States. National Aeronautics and Space Administration Scientific and Technical Information Division
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Category : Aeronautics
Languages : en
Pages : 478
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Author: United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
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ISBN:
Category : Aeronautics
Languages : en
Pages : 470
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Author: R. A. Curnutt
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Category :
Languages : en
Pages : 102
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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. (Author).
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Category : Aeronautics
Languages : en
Pages : 232
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Author: Joseph R. Chambers
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Category : Airplanes
Languages : en
Pages : 66
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Author: H. C Curtiss (Jr)
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Category :
Languages : en
Pages : 124
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The results of experiments conducted to evaluate the longitudinal stability characteristics of a 1/10 scale dynamic model of a four-propeller tilt-wing VTOL transport are presented and discussed. The Princeton Dynamic Model Track was used to measure the static stability and the transient response of the model at wing incidences from 90 degrees to 40 degrees. The results are interpreted in terms of full-scale aircraft characteristics. All data are presented for a C.G. position of 90% MAC (the most forward C.G. position of the aircraft is 15% MAC) and the horizontal tail and flap program differ from those presently used on the aircraft. The transient motions at wing incidences above 70 degrees were similar and dominated by high speed stability and low angular damping resulting in an unstable oscillation of approximately a 9-second period for the full-scale aircraft. The responses at wing incidences below 70 degrees were more complex due to a rapid decrease in the speed stability from a large positive value above 70 degrees to a negative value at 60 degrees. The values of the speed stability for the aircraft determined by a detailed analysis of the data in the neighborhood of 60 degrees wing incidence differ from those obtained from a preliminary analysis of the data by the LTV Aerospace Corporation. Typically, at wing incidences between 60 degrees and 40 degrees the linearized static stability derivatives M sub u and M sub alpha were small, nonlinearities were evident, and the small amplitude linearized motion was dominated by a divergence. At 40 degrees wing incidence, indications were that the dynamic motions were becoming stable. (Author).
Author: Louis P. Tosti
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ISBN:
Category :
Languages : en
Pages : 26
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