National Advisory Committee for Aeronautics (NACA) - 273 Matching Results

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Methods for obtaining desired helicopter stability characteristics and procedures for stability predictions

Description: A report in two parts: one is a brief review of methods available to helicopter designers for obtaining desired stability characteristics by modifying airframe design and the other is a review of some of the methods of predicting rotor stability derivatives.
Date: February 1957
Creator: Gustafson, F. B. & Tapscott, Robert J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ditching investigations of dynamic models and effects of design parameters on ditching characteristics

Description: From Summary: "Data from ditching investigations conducted at the Langley Aeronautical Laboratory with dynamic scale models of various airplanes are presented in the form of tables. The effects of design parameters on the ditching characteristics of airplanes, based on scale-model investigations and on reports of full-scale ditchings, are discussed. Various ditching aids are also discussed as a means of improving ditching behavior."
Date: February 1957
Creator: Fisher, Lloyd J. & Hoffman, Edward L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Some effects of tail height and wing plan form on the static longitudinal stability characteristics of a small-scale model at high subsonic speeds

Description: Report presenting an investigation in the high-speed 7- by 10-foot tunnel to determine some effects of tail height and wing plan form on the static longitudinal stability characteristics of a complete, small-scale model at high subsonic speeds. It had both a low-tail and high-tail position. Results regarding the lift and drag characteristics and longitudinal stability characteristics are provided.
Date: May 1957
Creator: Few, Albert G., Jr. & King, Thomas J., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An investigation at low speed of the flow over a simulated flat plate at small angles of attack using pitot-static and hot-wire probes

Description: Report presenting results from pitot-static and hot-wire anemometer surveys at low speed of the flow over a thin, sharp-edge airfoil which simulated a flat plate. The primary purpose was to obtain detailed measurements of the flow associated with the so-called thin-airfoil type of stall. Results regarding the preliminary tests, pressure distributions, mean flow measurements, velocity fluctuation measurements, and observations and measurements of the flow in the immediate vicinity of the leading… more
Date: March 1957
Creator: Gault, Donald E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Static Aeroelastic Behavior of Low-Aspect-Ratio Rectangular Wings

Description: "Slender-body theory is used in conjunction with late theory to analyze the static aeroelastic-divergence behavior of low-aspect-ratio rectangular wings of constant thickness when chordwise deformations are considered. In the analysis, the spanwise variation of the deflection is restricted to a parabola but the chordwise variation is allowed complete freedom. Results show the variation of the divergence speed and mode shape with the aspect ratio" (p. 1).
Date: April 1957
Creator: Hedgepeth, John M. & Waner, Paul G., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Frequency and Temperature on Fatigue of Metals

Description: Note presenting a qualitative approach to the problem of the effect of frequency and temperature on fatigue, as the theoretical and experimental results do not always seem to match. The fatigue problem is examined from the viewpoint of a two-component system.
Date: February 1957
Creator: Valluri, S. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On Stokes' Stream Function in Compressible Small-Disturbance Theory

Description: Note presenting a study of Stokes' stream function for subsonic or supersonic flow past axisymmetric bodies of small slope. The first-order equation is found to be nonlinear. It can be linearized if one seeks only the formal order of accuracy of the slender-body approximation.
Date: February 1957
Creator: Van Dyke, Milton D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Cascade investigation of a related series of 6-percent-thick guide-vane profiles and design charts

Description: Report presenting a description of a new blade series designed to operate at near choking inlet Mach numbers and to have near maximum critical Mach numbers by employing high aerodynamic loading of the profiles in the leading-edge region. Results regarding aerodynamic characteristics and prediction of high-speed performance are provided.
Date: May 1957
Creator: Dunavant, James C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Expected numbers of maxima and minima of a stationary random process with non-Gaussian frequency distribution

Description: Report presenting a method for calculating the expected number of maxima or minima of a random process with non-Gaussian frequency distribution from the statistical moments of the process and its first two derivatives. The effects of skewness and kurtosis can also be calculated provided the required moments are known.
Date: April 1957
Creator: Diederich, Franklin W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aerodynamic Characteristics of a Circular Cylinder at Mach Number 6.86 and Angles of Attack Up to 90 Degrees

Description: "Pressure-distribution and force tests of a circular cylinder have been made in the Langley 11-inch hypersonic tunnel at a Mach number of 6.88, a Reynolds number of 129,000, and angles of attack up to 90 degrees. The results are compared with the hypersonic approximation of Grimminger, Williams, and Young and a simple modification of the Newtonian flow theory. An evaluation of the crossflow theory is made through comparison of present results with available crossflow Mach number drag coefficien… more
Date: January 1957
Creator: Penland, Jim A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Charts for the analysis of flow in a whirling duct

Description: From Summary: "Charts are developed for the analysis of flow in a whirling constant-diameter duct. These charts permit the determination of the duct-exit Mach number, or the Mach number at any point along the duct, for practical ranges of duct-inlet Mach number, duct-tip Mach number, friction factor, ratio of ambient temperature to duct-flow total temperature, ratio of duct-tip radius to duct hydraulic diameter, and heat conductivity through the duct wall and surrounding material. The method of… more
Date: May 1957
Creator: Makofski, Robert A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of the planing lift of a flat plate at speeds up to 170 feet per second

Description: Report presenting an investigation in the high-speed hydrodynamics facility to determine whether planing lift coefficient of a flat-bottom planing surface remains constant with increasing speed at the high towing speeds obtainable. The generally accepted assumption that there is no effect of speed on the lift coefficient of positive-pressure lifting surfaces is valid at least up to 170 fps.
Date: March 1957
Creator: Christopher, Kenneth W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Instrument Flight Trials with Helicopter Stabilized in Attitude About Each Axis Individually

Description: Note presenting flight investigations of single-axis attitude stabilization during low-speed instrument approaches. A single-rotor helicopter that had been modified to include an electronic control system was used in the investigation. Results regarding heading stabilization, pitch stabilization, and roll stabilization are provided.
Date: January 1957
Creator: Salmirs, Seymour & Tapscott, Robert J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Preliminary Data at a Mach Number of 2.40 of the Characteristics of Flap-Type Controls Equipped With Plain Overhang Balances

Description: Report presenting an investigation at Mach number 2.40 to determine the aerodynamic characteristics of plain overhang balances on flap-type controls. Testing was performed on a two-dimensional wing with three trailing-edge flaps with balance lengths of 38, 60, and 82 percent of the flap chord. The effect of wing-flap gap size were investigated for the flap with 38 percent balance.
Date: March 1957
Creator: Mueller, James N. & Czarnecki, K. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimental Investigation of the Oscillating Forces and Moments on a Two-Dimensional Wing Equipped With an Oscillating Circular-Arc Spoiler

Description: Report presenting an experimental investigation in the flutter research tunnel on the oscillating forces and moments on a two-dimensional wing equipped with an oscillating circular-arc spoiler.
Date: March 1957
Creator: Clevenson, Sherman A. & Tomassoni, John E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Similarity Rules for Second-Order Subsonic and Supersonic Flow

Description: "The similarity rules for linearized compressible flow theory (Göthert's rule and its supersonic counterpart) are extended to second order. It is shown that any second-order subsonic flow can be related to "nearly incompressible" flow past the same body, which can be calculated by the Janzen-Rayleigh method" (p. 1).
Date: January 1957
Creator: Van Dyke, Milton D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Lift and moment responses to penetration of sharp-edged traveling gusts, with application to penetration of weak blast waves

Description: Report presenting calculations of the lift and moment responses to penetration of sharp-edged traveling gusts for wings in incompressible and supersonic two-dimensional flow, for wide delta and rectangular wings in supersonic flow, and for very narrow delta wings. The results of the calculations indicate that the forward speed of the gusts has a large effect on the lift- and moment-response functions.
Date: May 1957
Creator: Drischler, Joseph A. & Diederich, Franklin W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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On flow of electrically conducting fluids over a flat plate in the presence of a transverse magnetic field

Description: Report presenting a study of the use of a magnetic field to control the motion of electrically conducting fluids. Results indicated that the skin friction and heat-transfer rate are reduced when the transverse magnetic field is fixed relative to the plate and increased when fixed relative to the fluid.
Date: May 1957
Creator: Rossow, Vernon J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The erosion of meteors and high-speed vehicles in the upper atmosphere

Description: From Summary: "A simple inelastic collision model of meteor-atmosphere interaction is used and analytic relations for velocity, deceleration, size, and relative luminous magnitude of meteors are derived and expressed in dimensionless parametric form. The analysis is compared with available quantitative observations of meteor behavior and it is indicated that a large fraction of the atmospheric bombardment energy is used in eroding meteor material. The erosion from large, high-speed vehicles as … more
Date: March 1957
Creator: Hansen, C. Frederick
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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A Study of The "Toss Factor" in the Impact Testing of Cermets by the Izod Pendulum Test

Description: The test method presented shows that the "toss energy" contributed by the apparatus for brittle materials is negligible. The total toss energy is considered to consist of two components: (a) recovered stored elastic energy and (b) kinetic energy contributed directly by the apparatus. The results were verified by high-speed motion pictures of the test in operation.
Date: February 1957
Creator: Probst, H. B. & McHenry, Howard T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Equations, Tables, and Figures for Use in the Analysis of Helium Flow at Supersonic and Hypersonic Speeds

Description: Report presenting equations, tables, and figures for use in the analysis of helium flow at supersonic and hypersonic speeds. Tables are provided for useful dimensionless ratios for continuous one-dimensional flow and normal-shock waves as functions of Mach number. The oblique-shock characteristics of wedges and cones in helium at various Mach numbers are also presented.
Date: September 1957
Creator: Mueller, James N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Laminar Boundary Layer With Heat Transfer on a Cone at Angle of Attack in a Supersonic Stream

Description: Note presenting the equations of the compressible laminar boundary layer for the windward streamline in the plane of symmetry of a yawed cone. Solutions are obtained for both insulated and cooled surfaces. The heat-transfer rate to this most windward streamline increases significantly with angle of attack.
Date: December 1957
Creator: Reshotko, Eli
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Experimentally determined natural vibration modes of some cantilever-wing flutter models by using an acceleration method

Description: From Summary: "Three-dimensional views are presented of the first three natural vibration mode shapes of ten cantilever-wing models. A table of normalized deflections at six spanwise and five chordwise stations is included for each mode. These mode shapes were measured by a rather unique experimental technique using grains of sand as accelerometers."
Date: April 1957
Creator: Hanson, Perry W. & Tuovila, W. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Investigation of High-Temperature Vacuum and Hydrogen Furnace Brazing

Description: Note presenting an investigation of the vacuum and hydrogen brazing of four heat-resistant alloys with two types of high-temperature brazing alloy. The effect of time at two brazing temperatures on the 1200 degrees Fahrenheit shear strength of joints and on the base-metal properties was studied. Shear specimens of all four base alloys brazed in hydrogen with box types of brazing alloy exhibited erratic joint coverage by the brazing alloys.
Date: March 1957
Creator: Russell, Walter E. & Wisner, John P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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