UNT Libraries Government Documents Department - 24 Matching Results

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open access

Wind-tunnel studies of the performance of multirotor configurations

Description: Report presenting the power requirements measured in static thrust and in level forward flight for two helicopter rotor configurations. One is a coaxial rotor arrangement with the rotors spaced approximately 19 percent of the rotor radius; the other is a tandem configuration in which the rotor-shaft spacing is 3 percent greater than the rotor diameter and in which the rotors lie in the same plane.
Date: August 1954
Creator: Dingeldein, Richard C.
Item Type: Refine your search to only Report
open access

Theoretical investigation of the effects upon lift of a gap between wing and body of a slender wing-body combination

Description: Report presenting the application of slender-body theory to the study of effects upon lift produced by the presence of a gap between the wing and cylindrical body of a slender wing-body combination.Two conditions were studied, one in which the wing and body have the same angle of attack and the other in which only the deflected wing had an angle of incidence to the free stream.
Date: August 1954
Creator: Dugan, Duane W. & Hikido, Katsumi
Item Type: Refine your search to only Report
open access

Review of Information on Induced Flow of a Lifting Rotor

Description: "A brief review of the available information relating to included flow of a lifting rotor is presented. The available material is summarized in a table as to flight conditions, type of information, source, and the reference papers in which the data can be found. Some representative aspects of some of the reference material are discussed" (p. 1).
Date: August 1954
Creator: Gessow, Alfred
Item Type: Refine your search to only Report
open access

Some Effects of Exposure to Exhaust-Gas Streams on Emittance and Thermoelectric Power of Bare-Wire Platinum Rhodium - Platinum Thermocouples

Description: Thermocouples were exposed to exhaust gases from the combustion of propane, 72-octane gasoline, and JP-4 fuel. Exposure increased the emissivity of the thermocouple wire, which increased its radiation error. Two methods are presented for determining the emittance of the wires. The emissivity of a clean platinum rhodium-platinum thermocouple was approximately 0.2 in the temperature range investigated, while the emittance of an exposed thermocouple coated with exhaust residue was about 0.5. The e… more
Date: August 1954
Creator: Glawe, George E. & Shepard, Charles E.
Item Type: Refine your search to only Report
open access

Investigation of Mach Number Changes Obtained by Discharging High-Pressure Pulse Through Wind Tunnel Operating Supersonically

Description: Note presenting a series of tests to obtain an indication of the transient-flow phenomena caused by discharging a chamber of high-pressure gas into a wind tunnel operating supersonically. Two types of gust were obtained for the configurations tested. Results regarding two-dimensional conventional nozzles and axially symmetric multinozzle are provided.
Date: August 1954
Creator: Haefeli, Rudolph C. & Bernstein, Harry
Item Type: Refine your search to only Report
open access

Reduction of Helicopter Parasite Drag

Description: "A reduction in helicopter parasite drag is possible but not profitable except in those cases where high speed and long range are primary requirements. For some of the factors causing drag, reduction in parasite-drag area may result in increased weight whereas, in other cases, it does not. The final design, however, must be a compromise between the reduction of drag and the increase in weight" (p. 1).
Date: August 1954
Creator: Harrington, Robert D.
Item Type: Refine your search to only Report
open access

Low speed yawed-rolling and some other elastic characteristics of two 56-inch-diameter, 24-ply-rating aircraft tires

Description: Report investigating the low-speed cornering characteristics of two 56 x 16, type VII, extra-high-pressure, 24-ply-rating tires for a range of vertical loadings, yaw angles, and tire inflation pressures. The quantities measured included cornering force, drag force, self-alining torque, pneumatic caster, vertical tire deflection, rolling radius, and relaxation length. Some supplementary testing included measurements of tire footprint area, vertical-load-deflection characteristics, and variation … more
Date: August 1954
Creator: Horne, Walter B.; Stephenson, Bertrand H. & Smiley, Robert F.
Item Type: Refine your search to only Report
open access

Some aspects of the helicopter noise problem

Description: "Some aspects of the helicopter noise problem are briefly discussed. These discussions deal with the nature of the problem, some tentative criteria for use in evaluating it, and the physical characteristics of noise from helicopters. Overall noise data are presented for a reciprocating-engine helicopter along with discussions of the characteristics of noise from its various components such as the engine, gearing, and rotors. Some consideration is also given to the noise from tip jet rotor syste… more
Date: August 1954
Creator: Hubbard, Harvey H. & Lassiter, Leslie W.
Item Type: Refine your search to only Report
open access

Bending Tests on Box Beams Having Solid- and Open-Construction Webs

Description: "The results of an exploratory experimental investigation of the effects of replacing alternate webs in a multiweb beam by open, post-stringer construction are reported. Post-stringer (either upright or inclined posts) construction is shown to perform the function of comparable-weight, solid, fabricated webs in the stabilization of the compression cover of a beam in bending both before and after buckling" (p. 1).
Date: August 1954
Creator: Johnson, Aldie E., Jr.
Item Type: Refine your search to only Report
open access

Mechanical Properties at Room Temperature of Four Cermets of Titanium Carbide with Nickel Binder

Description: "Room-temperature stress-strain curves are presented for compression, tension, and shear loadings on four compositions of titanium carbide with nickel binder. Values of ultimate strength, modulus of elasticity, modulus of rigidity, Poisson's ratio in the elastic region, density, and hardness for the four materials are tabulated" (p. 1).
Date: August 1954
Creator: Johnson, Aldie E., Jr.
Item Type: Refine your search to only Report
open access

A Nonlinear Theory of Bending and Buckling of Thin Elastic Shallow Spherical Shells

Description: The problem of the finite displacement and buckling, of a shallow spherical dome is investigated both theoretically and experimentally. Experimental results seem to indicate that the classical criterion of buckling is applicable to very shallow spherical domes for which the theoretical calculation was made. A transition to energy criterion for higher domes is also indicated.
Date: August 1954
Creator: Kaplan, A. & Fung, Y. C.
Item Type: Refine your search to only Report
open access

The Small-Disturbance Method for Flow of a Compressible Fluid With Velocity Potential and Stream Function as Independent Variables

Description: Note presenting the equations of two-dimensional compressible flow as treated according to the Prandtl-Busemann small-disturbance method. The independent variables are the compressible velocity potential and stream function and the dependent variables are the rectangular Cartesian coordinates in the plane of flow. The six first-order differential equations corresponding to the first three iteration steps are put into complex-vector form.
Date: August 1954
Creator: Kaplan, Carl
Item Type: Refine your search to only Report
open access

A method for evaluating the effects of drag and inlet pressure recovery on propulsion-system performance

Description: Report presenting a method of evaluating the ratio of aircraft thrust minus drag to ideal thrust for any inlet pressure recovery for airplanes with air-breathing propulsion systems. The qualities required for the evaluation include flight Mach number and altitude, engine total-pressure ratio and total-temperature ratio, engine air-flow requirements, and airplane drag.
Date: August 1954
Creator: Kremzier, Emil J.
Item Type: Refine your search to only Report
open access

Torsional Vibrations of Hollow Thin-Walled Cylindrical Beams

Description: Note presenting the differential equations and boundary conditions appropriate to the analysis of torsional vibrations of hollow thin-walled cylindrical beams. The results indicate that the numerical calculations show that elementary theory is adequate for the analysis of torsional vibrations of box beams with high or medium plan-form aspect ratios.
Date: August 1954
Creator: Kruszewski, Edwin T. & Kordes, Eldon E.
Item Type: Refine your search to only Report
open access

Determination of flame temperatures from 2000 to 3000 K by microwave absorption

Description: Report presenting equations derived for the measurement of flame temperatures from the attenuation of a microwave beam by temperature-induced free electrons from chemical elements introduced in the flame. The free electron collision frequency and an effective ionization potential for four alkali elements were determined experimentally. Results regarding the blast burner, liquid propellant burner, and effects of addition of salt solutions on flames are provided.
Date: August 1954
Creator: Kuhns, Perry W.
Item Type: Refine your search to only Report
open access

Aerodynamic characteristics of the NACA 64-010 and 0010-1.10 40/1.051 airfoil sections at Mach numbers from 0.30 to 0.85 and Reynolds numbers from 4.0 x 10(exp. 6) to 8.0 x 10(exp. 6)

Description: Report presenting an investigation in the low-turbulence pressure tunnel to determine the aerodynamic characteristics of NACA 64-010 and 0010-1.10 airfoil sections. The investigation covered a range of Mach and Reynolds numbers.
Date: August 1954
Creator: Loftin, Laurence K., Jr.
Item Type: Refine your search to only Report
open access

Investigation of nickel-aluminum alloys containing from 14 to 34 percent aluminum

Description: Report presenting an investigation of nickel-aluminum alloys which were from 14 to 34 percent aluminum by weight as part of a study of the properties of intermetallics. Results regarding the quality of castings, physical evaluation of cast alloys, hot formability of alloys, physical properties of 17.5-percent-aluminum alloy, microstructure of 17.5-percent-aluminum alloy, the casting method, and other properties of the intermetallics are provided.
Date: August 1954
Creator: Maxwell, W. A. & Grala, E. M.
Item Type: Refine your search to only Report
open access

Hovering performance of a helicopter rotor using NACA 8-H-12 airfoil sections

Description: Report presenting an investigation of a helicopter rotor employing an NACA 8-H-12 airfoil section that has been tested in the helicopter test tower. Two blade surface conditions, one with a filled blade using a plastic filler and one with the filler removed. The performance of the blades in the condition they arrived in was about what would be expected from good practical-construction rotor blades.
Date: August 1954
Creator: Powell, Robert D., Jr.
Item Type: Refine your search to only Report
open access

Examination of the Existing Data on the Heat Transfer of Turbulent Boundary Layers at Supersonic Speeds From the Point of View of Reynolds Analogy

Description: Note presenting heat-transfer data from four wind-tunnel experiments and two free-flight experiments with turbulent boundary layers to see whether or not they are well represented by the Reynolds analogy or a modification thereof. The data cover the Mach number range from 1.4 to 3.2 at effective Reynolds numbers from 0.4 million to 24 million on a variety of body shapes. The results are presented in the form of ratios of experimental Stanton number to skin-friction coefficient and the 32 values… more
Date: August 1954
Creator: Seiff, Alvin
Item Type: Refine your search to only Report
open access

An analysis of the stability and ultimate bending strength of multiweb beams with formed-channel webs

Description: From Introduction: "The purpose of the present paper is to develop a simple method of calculating both the stress at which initial wrinkling occurs in muti-web beams and the ultimate bending strength of beams which are susceptible to this mode of instability."
Date: August 1954
Creator: Semonian, Joseph W. & Anderson, Roger A.
Item Type: Refine your search to only Report
open access

A review of planing theory and experiment with a theoretical study of pure-planing lift of rectangular flat plates

Description: Report presenting a summary of the background and present status of the pure-planing flat-plate lift theories. A proposed theory based on the consideration of linear lifting-line theory minus the suction component of lift plus crossflow effects is presented. A comparison of the theory with existing planing formulas and experimental data is also provided.
Date: August 1954
Creator: Shuford, Charles L., Jr.
Item Type: Refine your search to only Report
open access

An analysis of shock-wave cancellation and reflection for porous walls which obey an exponential mass-flow pressure-difference relation

Description: From Introduction: "In the present report a generalized exponential relation between pressure difference and normal flow is assumed which adequately describes porous-wall calibrations obtained experimentally at the Ames Laboratory and those presented in references 1 and 3."
Date: August 1954
Creator: Spiegel, Joseph M. & Tunnell, Phillips J.
Item Type: Refine your search to only Report
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