222 Matching Results

Search Results

Results: 1 - 24 next
open access

Comparison of Fatigue Strengths of Bare and Alclad 24S-T3 Aluminum-Alloy Sheet Specimens Tested at 12 and 1000 Cycles Per Minute

Description: Note presenting the results of axial fatigue tests conducted on 0.032-inch-thick flat-sheet specimens of bare and alclad 24S-T3 aluminum alloy to determine the effect of frequency of loading on the fatigue strengths of these materials. The number of cycles to failure varied from about 150 to over 10,000,000 and tests were conducted using completely reversed axial load at two frequencies of loading.
Date: December 1950
Creator: Smith, Frank C.; Brueggeman, William C. & Harwell, Richard H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Compressibility Correction for Turning Angles of Axial-Flow Inlet Guide Vanes

Description: Note presenting a simplified extension of the Prandtl-Glauert compressibility correction for isolated airfoils, which was obtained for airfoils in cascade with axial air inlet by considering the total lift coefficient of a cascade to be composed of the sum of two components. Results regarding theoretical variations, experimental correlation, and design application are provided.
Date: December 1950
Creator: Lieblein, Seymour & Sandercock, Donald M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Correlations of heat-transfer data and of friction data for interrupted plane fins staggered in successive rows

Description: Report presenting data from five reference reports and correlate the available heat-transfer and friction data on plane fin surfaces that are interrupted and staggered in successive rows in the fluid-flow direction. A single heat-transfer correlation equation was obtained that satisfactory represents the heat-transfer data over the entire range of conditions investigated.
Date: December 1950
Creator: Manson, S. V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Formulas for Source, Doublet, and Vortex Distributions in Supersonic Wing Theory

Description: Report presenting the formulas of supersonic wing theory for source, doublet, and vortex distributions, and a systematic presentation is provided which relates these distributions to the pressure and to the vertical induced velocity in the plane of the wing. Care must be used in treating the singularities involved in the analysis and that the order of integration is not always reversible. Certain special applications are included to illustrate the concepts presented.
Date: December 1950
Creator: Lomax, Harvard; Heaslet, Max A. & Fuller, Franklyn B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of the flow through a single-stage two-dimensional nozzle in the Langley 11-inch hypersonic tunnel

Description: Report presenting flow surveys in the second of several nozzles to be investigated in the 11-inch hypersonic tunnel. The single-stage, two-dimensional nozzle was designed by the method of characteristics for a Mach number of 7.08 without boundary-layer corrections. Results regarding the variation of flow properties with time, variation of flow parameters with settling-chamber pressure, calibration surveys, and general discussion of the nozzle characteristics are provided.
Date: December 1950
Creator: McLellan, Charles H.; Williams, Thomas W. & Beckwith, Ivan E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Relation Between Inflammables and Ignition Sources in Aircraft Environments

Description: From Summary: "A literature survey was conducted to determine the relation between aircraft ignition sources and inflammables. Available literature applicable to the problem of aircraft fire hazards is analyzed and discussed herein. Data pertaining to the effect of many variables on ignition temperatures, minimum ignition pressures, and minimum spark-ignition energies of inflammables, quenching distances of electrode configurations, and size of openings incapable of flame propagation are presen… more
Date: December 1950
Creator: Scull, Wilfred E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Spanwise Distribution of Lift for Minimum Induced Drag of Wings Having a Given Lift and a Given Bending Moment

Description: Note presenting an exploration of the problem of the minimum induced drag of wings with a given lift and a given span extended to include cases in which the bending moment to be supported by the wing is also given. The theory is limited to lifting surfaces traveling at subsonic speeds.
Date: December 1950
Creator: Jones, Robert Thomas
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Spanwise Distribution of Lift for Minimum Induced Drag of Wings Having a Given Lift and a Given Bending Moment

Description: "The problem of the minimum induced drag of wings having a given lift and a given span is extended to include cases in which the bending moment to be supported by the wing is also given. The theory is limited to lifting surfaces traveling at subsonic speeds. It is found that the required shape of the downwash distribution can be obtained in an elementary way which is applicable to a variety of such problems" (p. 1).
Date: December 1950
Creator: Jones, Robert T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Statistical Explanation of Spontaneous Freezing of Water Droplets

Description: Note presenting a theory based on the presence of small crystallization nuclei suspended in water to explain experimental results showing that on the average, small droplets can be supercooled to lower temperatures than large ones. The average behavior of the supercooled droplets is reproduced on the basis of probability theory with an assumed distribution of crystallization nuclei with respect to the temperatures at which the nuclei cause freezing.
Date: December 1950
Creator: Levine, Joseph
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Statistical Explanation of Spontaneous Freezing of Water Droplets

Description: Note presenting a statistical theory based on the presence of small crystallization nuclei suspended in water developed to explain experimental results showing that, on average, small droplets can be supercooled to lower temperatures than large ones. The average behavior of supercooled droplets is reproduced on the basis of probability theory with an assumed distribution of crystallization nuclei with respect to the temperatures at which the nuclei cause freezing.
Date: December 1950
Creator: Levine, Joseph
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Synthesis and purification of alkyldiphenylmethane hydrocarbons 1: 2-methyldiphenylmethane, 3-methyldiphenylmethane, 2-ethyldiphenylmethane, 4-ethyldiphenylmethane and 4-isopropyldiphenylmethane

Description: From Summary: "The syntheses of five alkyldiphenylmethane hydrocarbons, 2-methyldiphenylmethane, 3-methyldiphenylmethane, 2-ethyldiphenylmethane, 4-ethyldiphenylmethane, and 4-isoropyldiphenylmethane are described. The preparation of these hydrocarbons was based on the reaction of the appropriate arylmagnesium halides with benzaldehyde to yield the corresponding alkylbenzhydrols, which were subsequently converted to the hydrocarbons by hydrogenolysis."
Date: December 1950
Creator: Lamneck, John H., Jr. & Wise, Paul H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Theoretical Analysis of Oscillations in Hovering of Helicopter Blades With Inclined and Offset Flapping and Lagging Hinge Axes

Description: Note presenting the frequency and damping characteristics of the coupled flagging and lagging oscillations of helicopter blades in hovering as derived for the general case in which the lagging (vertical) hinge axis is offset from the flapping hinge axis, while both hinge axes are inclined. An offset of the flapping hinge axis from the rotor axis of rotation is also considered.
Date: December 1950
Creator: Morduchow, M. & Hinchey, F. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Balsa-Dust Technique for Air-Flow Visualization and Its Application to Flow Through Model Helicopter Rotors in Static Thrust

Description: Note presenting a method of visualizing air-flow patterns by observing the motion of finely divided particles of balsa wood introduced into the air. Photographic results obtained by this method for small-scale models of several helicopter rotor configurations in the static-thrust condition are presented. The results indicate the feasibility of using the balsa-dust technique for obtaining useful qualitative information on the air-flow patterns for transient conditions as well as for steady-state… more
Date: November 1950
Creator: Taylor, Marion K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Bending and buckling of rectangular sandwich plates

Description: "Differential equations and boundary conditions are derived for the bending and buckling of sandwich plates. The buckling load is calculated for a simply supported plate subjected to edgewise compression. The formulas are evaluated numerically and the results are plotted in a diagram" (p. 1).
Date: November 1950
Creator: Hoff, N. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Boundary-Layer and Stalling Characteristics of the NACA 64A010 Airfoil Section

Description: Note presenting a wind-tunnel investigation of the NACA 64A010 airfoil section to determine the boundary-layer and stalling characteristics at low speed. The tests were made at a Reynolds number of 4.1 million and included force measurements, pressure-distribution measurements, flow studies by the liquid-film technique, and boundary-layer measurements.
Date: November 1950
Creator: Peterson, Robert F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The dynamic lateral control characteristics of airplane models having unswept wings with round-and sharp-leading-edge sections

Description: Report presenting an investigation in the free-flight tunnel for the purpose of comparing the dynamic lateral control characteristics of airplane models with round- and sharp-leading-edge wing sections. The two dynamic models used in the investigation had different mass characteristics and had different types of inertia. Results regarding the interpretation of flight-test results, high-inertia model, and normal-inertia model are provided.
Date: November 1950
Creator: Hassell, James L. & Bennett, Charles V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Effect of End Plates on Swept Wings at Low Speed

Description: Note presenting an investigation made in the 300 mph 7 - by 10-foot tunnel to determine the effects of various sizes and shapes of end plates on the aileron characteristics and on the aerodynamic characteristics in pitch and yaw of a wing of aspect ratio 2 with no taper and a sweepback of 45 degrees and of a wing of aspect ratio 4, taper ratio 0.6, and sweepback of 46.7 degrees. The addition of end plates to the swept wings increased the lift-curve slope, reduced the maximum lift-drag ratio, ge… more
Date: November 1950
Creator: Riebe, John M. & Watson, James M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effects of modifications to the leading-edge region on the stalling characteristics of the NACA 63(sub 1)-012 airfoil section

Description: Report presenting a wind-tunnel investigation of a series of modifications to the leading-edge region of the NACA 63(sub 1)-012 airfoil section to determine the possibilities of delaying the flow separation that occurs near the leading edge of the basic section and improving the stalling characteristics. Results regarding the effect of the leading-edge modifications and effect of leading-edge flap are provided.
Date: November 1950
Creator: Kelly, John A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Formulas and Tables of Coefficients for Numerical Differentiation With Function Values Given at Unequally Spaced Points and Application to Solution of Partial Differential Equations

Description: Note presenting general differentiation formulas for successive derivative of a function, which are obtained in terms of the values of the function at unequally spaced arguments and the corresponding distances between the successive arguments using Lagrangian polynominals of various degrees. A general discussion of applying the formulas to the numerical solution of partial differential equations is made.
Date: November 1950
Creator: Wu, Chung-Hua
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Graphical Method for Obtaining Flow Field in Two-Dimensional Supersonic Stream to Which Heat Is Added

Description: Report presenting a graphical method for obtaining the two-dimensional supersonic flow with moderate heat addition. The basic equations were derived for flows in which the total temperature has a continuous variation with displacement in the direction of the flow.
Date: November 1950
Creator: Pinkel, I. Irving & Serafini, John S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Investigation of 75-millimeter-bore cylindrical roller bearings at high speeds 2: lubrication studies - effect of oil-inlet location, angle, and velocity for single-jet lubrication

Description: Report presenting an experimental investigation of the effect of several oil introduction parameters on the temperature of 75-millimeter-bore cylindrical-roller, inner-race-riding cage-type bearings over a range of DN values and static radial loads with single-jet circulating oil feed. Results regarding effect of radial location of oil jet, angle of impingement, effect of jet diameter, power required for oil delivery, and velocity effect are provided.
Date: November 1950
Creator: Macks, E. Fred & Nemeth, Zolton N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Multiple-Film Back-Reflection Camera for Atomic Strain Studies

Description: Note presenting the application of a new back-reflection X-ray diffraction technique, which was developed through use of a multiple-film camera containing four parallel films separated by known distances. Diffraction angles were calculated by determining the change in radius of the diffraction ring from film to film. A multiple-film-technique analysis and a conventional-method analysis of the same X-ray strain data indicated that a more detailed analysis of atomic strain could be obtained from … more
Date: November 1950
Creator: Marmo, Anthony B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Some Effects of Nonlinear Variation in the Directional-Stability and Damping-in-Yawing Derivatives on the Lateral Stability of an Airplane

Description: Note presenting a theoretical investigation made to determine the effect of nonlinear stability derivatives on the lateral stability of the airplane. The results indicated that under certain conditions, a motion is obtained which has different rates of damping for the large and small amplitudes of motion, with very little damping at the small amplitudes.
Date: November 1950
Creator: Sternfield, Leonard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Stress and distortion analysis of a swept box beam having bulkheads perpendicular to the spars

Description: Report presenting a method for the approximate calculation of the stresses and distortions in a box beam representing the main structural component of a swept wing with a carry-through section and with bulkheads perpendicular to the spars. Results regarding determination of shear-leg effects, effect of bulkhead flexibility, and extension of the method are provided.
Date: November 1950
Creator: Heldenfels, Richard R.; Zender, George W. & Libove, Charles
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen