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A Method of Calculating a Stability Boundary that Defines a Region of Satisfactory Period-damping Relationship of the Oscillatory Mode of Motion

Author : Leonard Sternfield

Publisher :

Page : 32 pages

File Size : 43,48 MB

Release : 1949

Category : Damping (Mechanics)

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Book Description

A method has been derived by which a boundary can be obtained that defines a region in which there exists a satisfactory relationship between the period and damping of the lateral oscillatory mode of motion, according to any given criterion for this relationship. In addition, a method is discussed by which curves representing a constant rate of spiral divergence may be constructed. The methods presented are applicable as well to the analysis of longitudinal stability. A method for evaluating the roots of a quartic equation is also discussed.





Technical Note

Author :

Publisher :

Page : 606 pages

File Size : 45,96 MB

Release : 1951

Category : Aeronautics

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Use of a Characteristic Surfaces for Unisymmetrical Supersonic Flow Problems

Author : W. E. Moeckel

Publisher :

Page : 674 pages

File Size : 42,53 MB

Release : 1949

Category : Aerodynamics, Supersonic

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Book Description

Application of the method of characteristics to the linearized three-dimensional equation results in a relatively simple system of difference equations that can be used to compute the supersonic flow past boundaries for which no other linearized solutions are available.





The Aerodynamic Design of Supersonic Propellers from Structural Considerations

Author : Jerome B. Hammack

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Page : 682 pages

File Size : 37,98 MB

Release : 1952

Category : Aerodynamics, Supersonic

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Book Description

The aerodynamic design of propellers from considerations of centrifugal force is presented. A solution is obtained for the span wise distribution of cross-sectional area required to attain constant centrifugal stress over most of the blade.







Investigation of NACA 64,2-432 and 64,3-440 Airfoil Sections with Boundary-layer Control and an Analytical Study of Their Possible Applications

Author : Elmer A. Horton

Publisher :

Page : 666 pages

File Size : 36,79 MB

Release : 1951

Category : Aerofoils

ISBN :

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Book Description

An investigation was made to determine the effect of boundary-layer control by means of suction through a slot of 0.60c on the pressure distribution, lift, and drag characteristics of the NACA 64,2-432 and 64,3-440 airfoil sections. The effect on the section aerodynamic characteristics of boundary-layer control by means of a slot at 0.50c and by means of area suction from 0.55c to 0.71c was also investigated for the NACA 64,3-440 airfoil. An analysis was made to show the effect of such thick airfoil sections and boundary-layer control on the lift-drag ratio of a wing. The section data presented and employed in the analysis to the leading edges of the models. This roughness was probably more severe than that likely to be encountered on practical aircraft under normal operating conditions; therefore, the drag coefficients measured bot with and without boundary layer control may be somewhat high as compared with practical flight values.