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Technical Report Archive and Image Library
942
National Advisory Committee for Aeronautics Collection
548
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359
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201
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123
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24
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343
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169
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66
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1,469 Matching Results
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Elastic Constants for Corrugated-Core Sandwich Plates
"The sandwich plate consisting of corrugated sheet fastened between two face sheets is considered. Application of existing theories to the analysis of such a sandwich plate requires the knowledge of certain elastic constants. Formulas and charts are presented for the evaluation of these constants" (p. 1).
Date:
February 1951
Creator:
Libove, Charles & Hubka, Ralph E.
Object Type:
Report
System:
The UNT Digital Library
Lift and Pitching Derivatives of Thin Sweptback Tapered Wings with Streamwise Tips and Subsonic Leading Edges at Supersonic Speeds
Note presenting the lift-due-to-pitching derivative and the damping-in-pitch derivative, which were derived for a series of thin sweptback tapered wings with streamwise tips and subsonic leading edges. The effects of camber and thickness were not considered.
Date:
February 1951
Creator:
Malvestuto, Frank S., Jr. & Hoover, Dorothy M.
Object Type:
Report
System:
The UNT Digital Library
Static and Fatigue Strengths of High-Strength Aluminum-Alloy Bolted Joints
Note presenting static and fatigue tests made on several types of joints in 75S-T6, 24S-T4, and 14S-T6 high-strength aluminum-alloy extruded bar. In the static tensile tests, the 75S-T6 double-shear joint withstood the highest ultimate load, 115,250 pounds, and the 75S-T6 clamped-keyed joint the lowest, 55,000 pounds, a ratio of 2.08 to 1.
Date:
February 1951
Creator:
Hartmann, E. C.; Holt, Marshall & Eaton, I. D.
Object Type:
Report
System:
The UNT Digital Library
Effect of an Increase in Angle of Dead Rise on the Hydrodynamic Characteristics of a High-Length-Beam-Ratio Hull
Report presenting an investigation in Langley tank no. 1 to determine the effects of increasing the angle of dead rise on various hydrodynamic qualities of a flying-boat hull with a length-beam ratio of 15. Results regarding the longitudinal stability, spray characteristics, take-off performance, rough-water landing characteristics, and a summary chart are provided.
Date:
February 1951
Creator:
Whitaker, Walter E., Jr. & Bryce, Paul W., Jr.
Object Type:
Report
System:
The UNT Digital Library
Investigation of Fretting Corrosion by Microscopic Observation
Note presenting an investigation using microscopic observation of the action to determine the cause of fretting corrosion. Glass and other noncorrosive materials, as well as metals, were used as specimens. Results regarding metal against metal, metal against nonmetal, and nonmetals against nonmetals are provided.
Date:
February 1950
Creator:
Godfrey, Douglas
Object Type:
Report
System:
The UNT Digital Library
Effect of tunnel configuration and testing technique on cascade performance
Report presenting an investigation to determine the influence of aspect ratio, boundary-layer control by means of slots and porous surfaces, Reynolds number, and tunnel end-wall condition on the performance of airfoils in cascade. A representative compressor-blade section of three aspect ratios has been tested at low speeds in cascades with solid and porous side walls.
Date:
February 1950
Creator:
Erwin, John R. & Emery, James C.
Object Type:
Report
System:
The UNT Digital Library
A small-deflection theory for curved sandwich plates
From Summary: "A small-deflection theory that takes into account deformations due to transverse shear is presented for the elastic-behavior analysis of orthotropic plates of constant cylindrical curvature, with considerations of buckling included. The theory is applicable primarily to sandwich construction."
Date:
February 1950
Creator:
Stein, Manuel & Mayers, J.
Object Type:
Report
System:
The UNT Digital Library
Results of Shear Fatigue Tests of Joints With 3/16-Inch-Diameter 24S-T31 Rivets in 0.064-Inch-Thick Alclad Sheet
Note presenting shear fatigue tests of joints with rivets in Alclad sheet of several high-strength aluminum alloys. The results showed that the design of the joint gives a wider range of fatigue strengths than does the choice of material from the group studied. No one sheet alloy showed superiority over the others.
Date:
February 1950
Creator:
Holt, Marshall
Object Type:
Report
System:
The UNT Digital Library
Static longitudinal stability and control of a convertible-type airplane as affected by articulated-and rigid-propeller operation
Report presenting the results of an investigation in the full-scale tunnel of the static longitudinal stability and control of a convertible-type airplane as affected by articulated- and rigid-propeller operation. The investigation included force measurements for a large angle-of-attack range of the model with the all-movable horizontal tail installed and removed. Results regarding the static longitudinal stability and control at normal-flight altitudes and transition range are provided.
Date:
February 1950
Creator:
Lange, Roy H. & McLemore, Huel C.
Object Type:
Report
System:
The UNT Digital Library
Water Landing Investigation of a Model Having a Heavy Beam Loading and a 30 Degree Angle of Dead Rise
Results presenting testing of a model with heavy beam loading and an angle of dead rise of 30 degrees subjected to smooth-water impacts in the Langley impact basin. Testing was made at fixed trims of 6 degrees, 15 degrees, 30 degrees, and 45 degrees for a range of flight-path angles and consistent beam-loading coefficient. Time histories of horizontal and vertical displacements, vertical velocity, vertical acceleration, and pitching moment are provided.
Date:
February 1950
Creator:
Batterson, Sidney A. & McArver, A. Ethelda
Object Type:
Report
System:
The UNT Digital Library
Low-Speed Investigation of a Thin, Faired, Double-Wedge Airfoil Section with Nose Flaps of Various Chords
Note presenting an investigation of a thin, faired, double-wedge airfoil section with plain nose flaps with chords equal to 12, 16, 20, and 25 percent of the airfoil chord. Section lift, drag, and pitching-moment data were obtained at a Reynolds number of 5.8 million and a Mach number of 0.17. A greater positive shift in the angle of attack for zero lift and more negative pitching moments resulted from increasing chord of the nose flap.
Date:
February 1950
Creator:
Rose, Leonard M. & Altman, John M.
Object Type:
Report
System:
The UNT Digital Library
Determination of the Rate of Roll of Pilotless Aircraft Research Models by Means of Polarized Radio Waves
Note presenting a method for determining the rate of roll of free-flight aerodynamic models by means of polarized radio waves. The discussion shows that through the use of the technique, the direction of roll, as well as zero roll, is uniquely determined. Analysis of the data obtained and data accuracy are discussed and examples are given to show how the record-reduction method affects the accuracy of the data.
Date:
February 1950
Creator:
Harris, Orville R.
Object Type:
Report
System:
The UNT Digital Library
Effect of Valve Overlap and Compression Ratio on Variation of Measured Performance With Exhaust Pressure of Aircraft Cylinder and on Computed Performance of Compound Power Plant
Note presenting an investigation conducted on an aircraft liquid-cooled single-cylinder test engine equipped with direct fuel injection to determine the effect of valve overlap and compression ratio on variation of engine power and specific fuel consumption with exhaust pressure. Results regarding the experimental engine data and compound-power-plant performance are provided.
Date:
February 1950
Creator:
Eian, Carroll S.
Object Type:
Report
System:
The UNT Digital Library
Effects on longitudinal stability and control characteristics of a B-29 airplane of variations in stick-force and control-rate characteristics obtained through use of a booster in the elevator-control system
The longitudinal stability and control characteristics of a B-29 airplane have been measured with a control surface booster incorporated in the elevator-control system. The measurements were obtained with the booster operating to provide various control-force gradients and various maximum rates of control motion. Results are presented which show the effect of these booster parameters on the handling qualities of the test airplane.
Date:
February 1951
Creator:
Mathews, Charles W.; Talmage, Donald B. & Whitten, James B.
Object Type:
Report
System:
The UNT Digital Library
Tests of Two-Blade Propellers in the Langley 8-Foot High-Speed Tunnel to Determine the Effect on Propeller Performance of a Modification of Inboard Pitch Distribution
"Tests of two propellers having two blades and differing only in the inboard pitch distribution were made in the Langley 8-foot highspeed tunnel to determine the effect of inboard pitch distribution on propeller performance. Propeller was designed for operation in the reduced velocity region ahead of an NACA cowling; the inboard pitch distribution of the modified propeller was increased for operation at or near free-stream velocities, such as would be obtained in a pusher installation. Conditions covering climb, cruise, and high-speed operation" (p. 1).
Date:
February 1951
Creator:
Delano, James B. & Carmel, Melvin M.
Object Type:
Report
System:
The UNT Digital Library
An Analytical and Experimental Investigation of the Skin Friction of the Turbulent Boundary Layer on a Flat Plate at Supersonic Speeds
Report presenting a review of turbulent-boundary-layer analyses and experimental data for average skin-friction coefficients on a flat plate in high-speed flow. New solutions are presented which show the effect of using a continuous velocity gradient and the effect of the extent of the laminar sublayer on the average skin-friction coefficient.
Date:
February 1951
Creator:
Rubesin, Morris W.; Maydew, Randall C. & Varga, Steven A.
Object Type:
Report
System:
The UNT Digital Library
Charts of Airplane Acceleration Ratio for Gusts of Arbitrary Shape
"The equation of vertical motion for an airplane in gusty air is simplified in order that its solution is a function of only two parameters, namely, the mass parameter of the airplane and the shape of the gust the airplane is penetrating. The solutions of the equation are presented in the form of charts that can be used for estimating rapidly and easily the acceleration ratios encountered by airplanes with different mass parameters penetrating a sharp-edge gust, a gust of arbitrary shape, or a triangular gust.
Date:
February 1950
Creator:
Mazelsky, Bernard
Object Type:
Report
System:
The UNT Digital Library
Resistance of six cast high-temperature alloys to cracking caused by thermal shock
Report presenting an investigation to determine the relative resistance of six cast high-temperature alloys to cracking caused by thermal shock. The alloys tested included S-816, S-590, Vitallium, 422-19, X-40, and Stellite 6. Results regarding the tabulation of cycles to failure, crack properties, metallographic examination, and some curves of deformation data are provided.
Date:
February 1950
Creator:
Whitman, M. J.; Hall, R. W. & Yaker, C.
Object Type:
Report
System:
The UNT Digital Library
Compressive Properties of Titanium Sheet at Elevated Temperatures
"Results are presented of compressive stress-strain tests of titanium sheet at temperatures from room temperature up to 800 degrees Fahrenheit, exposure times of 1/2 to 2 hours, and strain rates of 0.002 to 0.006 per minute. The results show that titanium has favorable compressive properties, comparable to those in tension, up through 800 degrees Fahrenheit. Marked anisotropy in compression was also noted" (p. 1).
Date:
February 1950
Creator:
Barrett, Paul F.
Object Type:
Report
System:
The UNT Digital Library
An experimental investigation of the NACA 631-012 airfoil section with leading-edge and midchord suction slots
Report presenting an investigation of using two suction slots in order to determine the effectiveness of a nose slot at higher values of lift. The suction through the midchord slot in conjunction with the nose slot resulted in substantial gains in the maximum lift over that obtainable with nose suction alone. Results regarding the lift, drag, and moment characteristics, pressure distribution, boundary-layer measurements, and plenum-chamber pressures are provided.
Date:
February 1950
Creator:
McCullough, George B. & Gault, Donald E.
Object Type:
Report
System:
The UNT Digital Library
Time-dependent downwash at the tail and the pitching moment due to normal acceleration at supersonic speeds
Report presenting an analysis of the time-dependent downwash behind a wing in a supersonic stream when the angle of attack varies linearly with time. The result is applied to the calculation of the contribution of the horizontal tail to the pitching moment and lift due to normal acceleration of the airplane. Results regarding downwash charts and some limitations on the results are provided.
Date:
February 1950
Creator:
Ribner, Herbert S.
Object Type:
Report
System:
The UNT Digital Library
Experimental analysis of a pressure-sensitive system for sensing gas temperature
Report presenting various theoretical and practical aspects of a pressure-sensitive system for the measurement of gas temperatures in gas-turbine-engine combustion chambers. An experimental setup was used under controlled conditions of temperature, weight flow, and wall temperature.
Date:
February 1950
Creator:
Cesaro, Richard S.; Koenig, Robert J. & Pack, George J.
Object Type:
Report
System:
The UNT Digital Library
Coincidence Method Applied to Ion Beam Measurement
"A coincidence Geiger counter system was constructed for the absolute measurement of the activity of radioactive substances made in a cyclotron. The average beam current in the cyclotron can be calculated from the number of disintegrations per second observed, the half-life of the radioactive substance, and the reaction cross section" (p. 1).
Date:
February 1952
Creator:
Fultz, Stanley & Pool, M. L.
Object Type:
Report
System:
The UNT Digital Library
Bonding of molybdenum disulfide to various materials to form a solid lubricating film 1: the bonding mechanism
Report presenting the use of molybdenum disulfide as a solid film lubricant in applications where designs or temperatures preclude liquid lubricants is dependent on successful bonding of the powder to the surface to be lubricated. An investigation was conducted to determine the basic mechanism of bonding and to extend application of the bonding to a variety of materials. Results regarding an examination of electron diffraction of MoS2 dusted and rubbed on steel, adherence of dry powders to metals, chemical action in bonding mechanism, other resin-forming liquid vehicles, bonding of MoS2 and other powders to various materials, and analysis of solid film by electron diffraction are provided.
Date:
February 1952
Creator:
Godfrey, Douglas & Bisson, Edmond E.
Object Type:
Report
System:
The UNT Digital Library