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Penetration of Air Jets Issuing from Circular, Square, and Elliptical Orifices Directed Perpendicularly to an Air Stream

Description: From Summary: "An experimental investigation was conducted to determine the penetration of air jets directed perpendicularly to an air stream. Jets issuing from circular, square, and elliptical orifices were investigated and the jet penetration at a position downstream of the orifice was determined- as a function of jet density, jet velocity, air-stream density, air-stream velocity, effective jet diameter, and orifice flow coeffIcient. The jet penetrations were determined for nearly constant va… more
Date: February 1950
Creator: Ruggeri, Robert S.; Callaghan, Edmund E. & Bowden, Dean T.
Item Type: Refine your search to only Report
open access

Tables for Determining Reduction of Energy and Intensity of X-Rays and Gamma-Rays at Various Scattering Angles in Small Thickness of Matter

Description: Report presenting tables for determining the total-absorption coefficients as well was the intensities and spectral distribution of gamma rays at any scattering angle. Both experimental and computed data on gamma rays of quantum energies up to 20 million electron volts for all elements which have significant data available are provided. The accuracy of results is obtained by the use of tables.
Date: February 1950
Creator: Allen, G.
Item Type: Refine your search to only Report
open access

Friction and wear of hot-pressed bearing materials containing molybdenum disulfide

Description: Report presenting an investigation to determine the feasibility of bearing lubrication by a process involving the transfer of molybdenum disulfide from within the structure of a composite bearing material to the interface between the contacting surfaces. The experiments were performed with a kinetic-friction apparatus employing a rotating steel disk and a bearing-specimen assembly suspended and restrained by metal springs.
Date: February 1950
Creator: Johnson, Robert L.; Swikert, Max A. & Bisson, Edmond E.
Item Type: Refine your search to only Report
open access

The Interpretation of Biaxial-Tension Experiments Involving Constant Stress Ratios

Description: "The slip theory of plasticity is applied to the problem of calculating the strains associated with biaxial tension for the case of constant stress ratios and is found to be in better agreement with experiment than the octahedral-shear and maximum-shear theories usually employed to analyze such data" (p. 1).
Date: February 1950
Creator: Batdorf, S. B.
Item Type: Refine your search to only Report
open access

Comparative Foaming Characteristics of Aeronautical Lubricating Oils

Description: Note presenting comparative data on the volume of foam and stability of foams of aeronautical lubricating oils produced at 100 degrees Celsius by the air-bubbling method. All of the data were obtained with the same foam meter, by a standard technique, and at various rates of air flow. Results regarding the reproducibility of foam tests and treatment of data are provided.
Date: February 1950
Creator: Woods, W. W. & Robinson, J. V.
Item Type: Refine your search to only Report
open access

Foaming of Mixtures of Pure Hydrocarbons

Description: Note presenting an investigation of nine hydrocarbons mixed in pairs, sealed in glass tubes, and foamed by shaking in order to examine the foaming properties of the hydrocarbons. Results for benzene, toluene, xylene, cumene, butyl benzene, isopentane, octene, octane, and decane are provided.
Date: February 1950
Creator: Robinson, J. V. & Woods, W. W.
Item Type: Refine your search to only Report
open access

Rise of Air Bubbles in Aircraft Lubricating Oils

Description: Note presenting measurements of the rates of rise of small air bubbles, up to 2 millimeters in diameter, at room temperature in an undoped oil, in the same oil containing foam inhibitors, and in an oil containing lubricating additives. The apparent diameter of the air bubbles was measured visually through an ocular micrometer on a traveling telescope. A method is derived to calculate the thickness of the liquid shell which would have to move with the bubbles in the doped oils to account for the… more
Date: February 1950
Creator: Robinson, J. V.
Item Type: Refine your search to only Report
open access

A method of determining the effect of airplane stability on the gust load factor

Description: Report presenting the equations of motion of a conventional airplane penetrating a gust in order to determine the effects due to stability on the gust load factor. A numerical method is derived in matrix notation which affords a systematic procedure of solving the equations for a unit jump or arbitrary forcing function. Sample calculations were performed to illustrate the application of the equations.
Date: February 1950
Creator: Mazelsky, Bernard & Diederich, Franklin W.
Item Type: Refine your search to only Report
open access

Effect of tunnel configuration and testing technique on cascade performance

Description: 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.
Item Type: Refine your search to only Report
open access

A small-deflection theory for curved sandwich plates

Description: 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.
Item Type: Refine your search to only Report
open access

Results of Shear Fatigue Tests of Joints With 3/16-Inch-Diameter 24S-T31 Rivets in 0.064-Inch-Thick Alclad Sheet

Description: 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
Item Type: Refine your search to only Report
open access

Static longitudinal stability and control of a convertible-type airplane as affected by articulated-and rigid-propeller operation

Description: 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.
Item Type: Refine your search to only Report
open access

Water Landing Investigation of a Model Having a Heavy Beam Loading and a 30 Degree Angle of Dead Rise

Description: 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
Item Type: Refine your search to only Report
open access

Low-Speed Investigation of a Thin, Faired, Double-Wedge Airfoil Section with Nose Flaps of Various Chords

Description: 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.
Item Type: Refine your search to only Report
open access

Determination of the Rate of Roll of Pilotless Aircraft Research Models by Means of Polarized Radio Waves

Description: 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.
Item Type: Refine your search to only Report
open access

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

Description: 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.
Item Type: Refine your search to only Report
open access

Charts of Airplane Acceleration Ratio for Gusts of Arbitrary Shape

Description: "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 … more
Date: February 1950
Creator: Mazelsky, Bernard
Item Type: Refine your search to only Report
open access

Resistance of six cast high-temperature alloys to cracking caused by thermal shock

Description: 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.
Item Type: Refine your search to only Report
open access

Compressive Properties of Titanium Sheet at Elevated Temperatures

Description: "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.
Item Type: Refine your search to only Report
open access

An experimental investigation of the NACA 631-012 airfoil section with leading-edge and midchord suction slots

Description: 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.
Item Type: Refine your search to only Report
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