Technical Report Archive & Image Library (TRAIL) - 327 Matching Results

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The Aerodynamic Analysis of the Gyroplane Rotating-Wing System

Description: "An aerodynamic analysis of the gyroplane rotating-wing system is presented herein. This system consists of a freely rotating rotor in which opposite blades are rigidly connected and allowed to rotate or feather freely about their span axis. Equations have been derived for the lift, the lift-drag ratio, the angle of attack, the feathering angles, and the rolling and pitching moments of a gyroplane rotor in terms of its basic parameters" (p. 1).
Date: March 1934
Creator: Wheatley, John B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Aerodynamic Effect of a Retractable Landing Gear

Description: "Tests were conducted in the N.A.C.A. full scale wind tunnel at the request of the Army Air Corps to determine the effect of retractable landing gear openings in the bottom surface of a wing upon the characteristics of a Lockheed Altair airplane. The tests were extended to include the determination of the lift and drag characteristics throughout the angle-of-attack range with the landing gear both retracted and extended. Covering the wheel openings in the wing with sheet metal when the wheels w… more
Date: March 1933
Creator: DeFrance, Smith J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aerodynamic Rolling and Yawing Moments Produced by Floating Wing-Tip Ailerons, as Measured by Spinning Balance

Description: From Summary: "The investigation described in this report was made to determine the effectiveness of floating wing-tip ailerons as an airplane control in the spin. In these tests the ailerons, not being balanced, were set parallel to the axis of rotation, which is probably very nearly the attitude that balanced floating ailerons would assume in a spin. Rolling - and yawing moment coefficients are given as measured for the model with and without the ailerons, and computed values are given for th… more
Date: March 1934
Creator: Bamber, Millard J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Aerodynamics of slender wings and wing-body combinations having swept trailing edges

Description: From Introduction: "In the present paper, a general method is developed for solving low-aspect-ratio problems involving shed vortex sheets. Both direct and inverse problems are considered. The method is applicable for all planar problems where the velocity boundary conditions can be made homogeneous by differentiation in either the streamwise or the spanwise directions."
Date: March 1954
Creator: Mirels, Harold
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Airplane Crashes: Engine Troubles: A Possible Explanation

Description: The aim was to bring attention to what might be the cause of some aircraft accidents for which there was no satisfactory explanation. The author notes that in testing aircraft accidents at the Bureau of Standards, it happened frequently that the engine performance became erratic when the temperature of the air entering the carburetor was between 0 C and 20 C. Investigation revealed the trouble to have been caused by the formation and collection of snow somewhere between the entrance to the carb… more
Date: March 1921
Creator: Sparrow, Stanwood W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ambient Pressure Determination at High Altitudes by Use of Free-Molecule Theory

Description: "Several methods (references 1 and 2) based on gas-dynamic principles are available for reducing such measurements. The results obtained by these methods are subject to the limitation of the gas-dynamic theory which is that the mean free path of the molecules between impacts, is small with respect to the measuring device. Inasmuch as no information on the subject is to present known to be available, the purpose of the present paper is to present a method based on the concept of free-molecule th… more
Date: March 1949
Creator: Wiener, Bernard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of accelerations, airspeeds, and gust velocities from three commercial operations of one type of medium-altitude transport airplane

Description: From Introduction: "Past analyses of data from the NACA V-G and the NACA VGH recorders (see, for example, refs. 1 and 2) have yielded information on the magnitude and frequency of occurrence of gust and maneuver accelerations, and the associated airspeeds and altitudes for several types of airplanes flown by different operators on various routes."
Date: March 1955
Creator: Coleman, Thomas L.; Copp, Martin R.; Walker, Walter G. & Engel, Jerome N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of Deep Rectangular Shear Web Above Buckling Load

Description: From Introduction: "An analysis of a square web above the buckling load was presented in reference 1. The analysis of reference 1 therefore was repeated for a shear web with depth/width = 2.5. Comparison of the results with those for the square web then would indicate the effect in the depth-width ratio."
Date: March 1946
Creator: Levy, Samuel; Woolley, Ruth M. & Corrick, Josephine N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of factors influencing the stability characteristics of symmetrical twin-intake Air-induction systems

Description: From Introduction: "Experimental investigations of air-induction systems in which the air flows of two intakes join in a common duct have inducted that many of these systems are subject to air-flow instability at low inlet-velocity ratios. Therefore, an analysis has been made to determine a proper basis for an explanation and to provide a more quantitative explanation of the flow instability and the flow reversal. This report presents the results of this analysis."
Date: March 1950
Creator: Martin, Norman J. & Holzhauser, Curt A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of the factors affecting the loss in lift and shift in aerodynamic center produced by the distortion of a swept wing under aerodynamic load

Description: From Introduction: "The importance of this aeroelastic phenomenon has been recognized for some time, and several investigators have developed more or less refined methods for analysis of wing elastic distortions and their effects. (For examples, see refs. 1 to 4.) More specific evidence as to the influence of wing external geometry (in conjunction with flight condition) on this flexibility-longitudinial-stability problem would appear to be of interest to the aerodynamicist, however, so that he … more
Date: March 1953
Creator: Mathews, Charles W. & Kurbjun, Max C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Analysis of the Stability and Ultimate Compressive Strength of Short Sheet-Stringer Panels with Special Reference to the Influence of Riveted Connection Between Sheet and Stringer

Description: A method of strength analysis of short sheet-stringer panels subjected to compression is presented which takes into account the effect that the riveted attachments between the plate and the stiffeners have on the strength of the panels. An analysis of experimental data shows that panel strength is highly influenced by rivet pitch, diameter, and location and that the degree of influence for a given riveting depends on the panel configuration and panel material. (author).
Date: March 1955
Creator: Semonian, Joseph W. & Peterson, James P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analytical and experimental study of the transient response of a pressure-regulating relief valve in a hydraulic circuit

Description: From Introduction: "This report presents an analysis of the response of the relief valve to sudden flow-demand changes. The analysis can be applied to the design of relief valves to satisfy given response specifications and to predict the stability of the valve in a specific hydraulic circuit. For this reason, derivatives of all the constants employed are included in the report."
Date: March 1954
Creator: Gold, Harold & Otto, Edward W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analytical determination of effect of water injection on power output of turbine-propeller engine

Description: From Introduction: "References 1 and 2 indicate that the sea-level static thrust of a centrigual-flow-type turbojet engine may be increased about 25 percent by use of liquid injection. Reference 3 indicates that greater thrust augmentation is possible at a compressor pressure ratio of 11 than of 4."
Date: March 1955
Creator: Ross, Albert O. & Huppert, Merle C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analytical study of modifications to the autopilot of a fighter airplane in order to reduce the response to side gusts

Description: From Introduction: "This study was the basis for the present paper which deals with means for compensating the roll and yaw response to side gusts of a fighter airplane in combination with an autopilot. Results are presented which compare the response to side gusts of the original and compensating autopilots; the responses to commands are presented also."
Date: March 1956
Creator: Mathews, Charles W. & Adams, James J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Application of a high-temperature static strain gage to the measurement of thermal stresses in a turbine stator vane

Description: From Introduction: "This report describes the high-temperature static strain gage and presents the results obtained in a determination of the thermal stresses in a turbine stator vane resulting from the temperature distribution obtained under steady-state conditions at rated speed and temperature of the engine."
Date: March 1958
Creator: Kemp, R. H.; Morse, C. R. & Hirschberg, M. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Application of the linearized theory of supersonic flow to the estimation of control-surface characteristics

Description: Report presenting the use of known conical-flow solutions of the linearized equation for the velocity potential in supersonic flow as applied to the calculation of the characteristics of control surfaces. Solutions for the pressure distributions are obtained for control surfaces with hinge lines swept ahead or behind the Mach line when the control-surface trialing edge is swept ahead of the Mach line.
Date: March 1948
Creator: Frick, Charles W., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An application of the method of characteristics to two-dimensional transonic flows with detached shock waves

Description: From Summary: "An application of the method of characteristics is presented which affords a means for determining the surface pressures for a class of two-dimensional airfoils of given nose shape and arbitrary rear part in a sonic or supersonic stream if surface pressure data are given for one member of the class. For engineering purposes, the method of characteristics may be replaced by a simple application of Prandtl-Meyer flow concepts. An explanation of the nonlinear force characteristics o… more
Date: March 1953
Creator: Harder, Keith C. & Klunker, E. B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Approximations for the thermodynamic and transport properties of high-temperature air

Description: Report presenting the thermodynamic and transport properties of high-temperature air in closed form starting from approximate partition functions for the major components in air and neglecting all minor components. The compressibility, energy, entropy, specific heats, speed of sound, coefficients of viscosity and thermal conductivity, and Prandtl numbers for air are provided for a range of temperatures and pressures.
Date: March 1958
Creator: Hansen, C. Frederick
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Bending Tests of Circular Cylinders of Corrugated Aluminum-Alloy Sheet

Description: "Bending tests were made of two circular cylinders of corrugated aluminum-alloy sheet. In each test failure occurred by bending of the corrugations in a plane normal to the skin. It was found, after analysis of the effect of short end bays, that the computed stress on the extreme fiber of a corrugated cylinder is in excess of that for a flat panel of the same basic pattern and panel length tested as a pin-ended column. It is concluded that this increased strength was due to the effects of curva… more
Date: March 1937
Creator: Niles, Alfred S.; Buckwalter, John C. & Reed, Warren D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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