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Charts for the Determination of Supersonic Air Flow Against Inclined Planes and Axially Symmetric Cones

Description: Report presenting a set of charts for the convenient determination of flow conditions behind a shock wave and at the surface of inclined planes and axially symmetric cones located in a uniform frictionless supersonic air stream. Shock angle, static-pressure coefficient, static-pressure ratio, total-pressure ratio, Mach number ratio, and velocity ratio for two-dimensional and conical flow fields are plotted for a range of free-stream Mach numbers.
Date: July 1947
Creator: Moeckel, W. E. & Connors, J. F.
Item Type: Refine your search to only Report
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Experimental Studies of the Knock-Limited Blending Characteristics of Aviation Fuels 2: Investigation of Leaded Paraffinic Fuels in an Air-Cooled Cylinder

Description: Note presenting the relation between knock limit and blend composition of selected aviation fuel components individually blended with virgin base and with alkylate as determined in a full-scale air-cooled aircraft-engine cylinder. Results regarding mixture-response curves, relation of knock limit to blend composition, and correlation of knock ratings are provided.
Date: July 1947
Creator: Wear, Jerrold D. & Sanders, Newell D.
Item Type: Refine your search to only Report
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Limits of Precision in the Determination of Lattice Parameters and Stresses by the Debye-Scherrer Method

Description: Note an investigation regarding the limits of precision in the determination of lattice parameters. Experiments were performed with copper radiation on zinc samples. Even when the crystal-grain orientation is perfectly uniform, the recording of the intensity distribution will entail errors.
Date: October 1947
Creator: Ekstein, Hans & Siegel, Stanley
Item Type: Refine your search to only Report
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Comparisons of Theoretical and Experimental Lift and Pressure Distributions on Airfoils in Cascade

Description: Note presenting comparisons of theoretical and experimental airfoil lift coefficients and pressure distributions made for two cascades of entrance vanes and three cascades of blower blades with NACA 6-series airfoils, and for one cascade of turbine blades. Results regarding the entrance vanes, blower blades, turbine blades, and possibilities of three-dimensional effects are provided.
Date: July 1947
Creator: Katzoff, S.; Bogdonoff, Harriet E. & Boyet, Howard
Item Type: Refine your search to only Report
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The Synthesis and Purification of Aromatic Hydrocarbons 5: 1-Ethyl-3-Methylbenzene

Description: "The method used for the synthesis and purification of an 8-gallon quantity of 1-ethyl-3-methylbenzene from m-creosol consists in obtaining m-methylcyclohexanone from m-creosol by hydrogenation followed by oxidation, condensation of the ketone with ethylmagnesium bromide, dehydration of the tertiary alcohol obtained, and the dehydration of the olefins to 1-ethyl-3-methylbenzene. A yield of 28 percent of the theoretical was obtained from 98 percent commercial m-creosol. The physical properties o… more
Date: November 1946
Creator: Ebersole, Earl R.
Item Type: Refine your search to only Report
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Appreciation and determination of the hydrodynamic qualities of seaplanes

Description: Report presenting a summary of the hydrodynamic qualities of interest in the normal operation of a seaplane, established over a period of years by model testing and by some knowledge of full-size operation. Results regarding longitudinal stability and control, landing stability, seaworthiness, performances, and lateral stability and control are provided.
Date: May 1947
Creator: Parkinson, John B.
Item Type: Refine your search to only Report
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Collection and analysis of wind-tunnel data on the characteristics of isolated tail surfaces with and without end plates

Description: Report presenting the aerodynamic characteristics of 19 isolated tail surfaces, which have been determined by wind tunnel tests. Testing was also made of rectangular airfoils of various aspect ratios with and without double end plates of various shapes. The analysis indicated that the slope of the lift curve could be predicted within 10 percent for all models by use of lifting-surface-theory equations.
Date: May 1947
Creator: Bates, William R.
Item Type: Refine your search to only Report
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Tests of the NACA 64(SUB 1)A212 airfoil section with a slat, a double slotted flap, and boundary-layer control by suction

Description: Report presenting an investigation of the NACA 64(sub 1)A212 airfoil section equipped with a leading-edge slat, a double slotted flap, and a boundary-layer-control suction slot at 0.40 chord to determine the maximum lift coefficients attainable with the high-lift devices alone and in conjunction with one another. Results regarding the effect of suction-slot location on the characteristics of a plain airfoil, plain airfoil characteristics, effect of irregularities caused by slat installation, ch… more
Date: May 1947
Creator: Quinn, John H., Jr.
Item Type: Refine your search to only Report
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Variation of Hydrodynamic Impact Loads With Flight-Path Angle for a Prismatic Float at 0 and -3 Degree Trim and With a 22 1/2 Degree Angle of Dead Rise

Description: Report presenting testing on a prismatic float model to determine the relationship between the vertical landing acceleration and flight-path angle for seaplanes landing in smooth water. Results regarding the maximum load factor, maximum impact normal acceleration, pressures, and stability of landings are provided.
Date: April 1947
Creator: Batterson, Sidney A.
Item Type: Refine your search to only Report
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Structural hinge-moment increments caused by hinge-axis distortion

Description: Report presenting an investigation of elevators with three hinges to evaluate the structural hinge-moment increments resulting from changing the elevator angle when the hinge axis is distorted under load. The analytical results are compared to test data obtained for a full-scale semispan fighter-type horizontal tail surface in the 16-foot high-speed tunnel.
Date: April 1946
Creator: Becker, John V. & Cooper, Morton
Item Type: Refine your search to only Report
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Wind-tunnel investigation of control-surface characteristics of plain and balanced flaps with several trailing-edge angles on a NACA 0009 tapered semispan wing

Description: Report presenting force tests in the 4 by 6 foot vertical tunnel to determine the aerodynamic characteristics of an NACA 0009 tapered semispan wing equipped with a plain and a balanced flap with three different included angles on the trailing edge. Results regarding lift, hinge moment, drag, pitching moment, and a comparison of calculated values with experimental values of finite-wing characteristics are provided.
Date: April 1947
Creator: Hoggard, H. Page, Jr. & McKinney, Elizabeth G.
Item Type: Refine your search to only Report
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A comparative study of weights and sizes of flat-plate exhaust-gas-to-air heat exchangers with and without fins

Description: Note presenting analytical comparisons of weights and volumes for flat-plate heat exchangers with the same calculated thermal output and friction pressure drop for three different fin configurations, including no fins, fins in both the air and exhaust gas passages, and fins in the air passages only. Two different heat exchangers were used and compared with predicted weights and volumes.
Date: July 1947
Creator: Tendeland, Thorval & Steinmetz, Charles P.
Item Type: Refine your search to only Report
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Quantitative Treatment of the Creep of Metals by Dislocation and Rate-Process Theories

Description: Note presenting an equation for the steady-state rate of creep, which has been derived by applying the theory of dislocations to the creep of pure metals. The form of this equation is in good agreement with empirical equations describing creep rates. A discussion of the way the theory can be applied to alloys, in particular heat-resisting alloys, is also provided.
Date: April 1946
Creator: Nowick, A. S. & Machlin, E. S.
Item Type: Refine your search to only Report
open access

A Study of Piston-Ring Friction

Description: Note presenting a series of tests made with a special engine equipped with a crosshead and an elastically mounted combustion cylinder. The apparatus permitted the isolation and measurement of the friction forces existing between the piston rings and the cylinder wall during operation of the engine.
Date: April 1947
Creator: Livengood, James C. & Wallour, Chapin
Item Type: Refine your search to only Report
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An Electrical Computer for the Solution of Shear-Lag and Bolted-Joint Problems

Description: "The analogy between the distribution of stresses in flat stiffened panels and the distribution of electric current in a ladder-type resistance network is used as the theoretical basis of an electrical computer for the rapid solution of shear-lag problems. The computer, consisting of variable resistors and multiple-current sources, is described; and typical examples are given of its use. The analogy is extended to include bolted-joint problems, and an example is given also" (p. 1).
Date: May 1947
Creator: Ross, Robert D.
Item Type: Refine your search to only Report
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Critical Shear Stress of Curved Rectangular Panels

Description: "A solution based upon small-deflection theory is presented for the critical shear stress of curved rectangular panels with simply supported edges. Computed curves which cover a wide range of panel dimensions are presented; these curves are found to be in good agreement with test results. Estimated curves are also given for panels with clamped edges" (p. 1).
Date: May 1947
Creator: Batdorf, S. B.; Stein, Manuel & Schildcrout, Murry
Item Type: Refine your search to only Report
open access

Collection of Test Data for Lateral Control With Full-Span Flaps

Description: Report presenting a collection of available test data on lateral control with full-span flaps. Internal-control effectiveness and hinge-moment data were obtained from two-dimensional, three-dimensional, and flight tests. Results regarding slot-lip and flap-trailing-edge ailerons, spoiler-type ailerons other than slot-lip ailerons, ailerons with retractable-type flaps, and application of data to specific airplane design are provided.
Date: April 1948
Creator: Fischel, Jack & Ivey, Margaret F.
Item Type: Refine your search to only Report
open access

Effect of Normal Pressure on Strength of Axially Loaded Sheet-Stringer Panels

Description: Note presenting tests under combined axial load and normal pressure on 29 24S-T aluminum alloy sheet-stringer panels. Empirical formulas were derived for predicting the effect of normal pressure on the strain for buckling of sheet between stringers. Results of buckling, sheet load, strains, buckling, and failure are provided.
Date: July 1946
Creator: McPherson, A. E.; Levy, Samuel & Zibritosky, George
Item Type: Refine your search to only Report
open access

Icing Properties of Noncyclonic Winter Stratus Clouds

Description: Note presenting measurements of the vertical distribution of liquid water concentration and drop size made in winter stratus clouds in the absence of significant cyclonic or frontal activity. The observations indicate that the clouds are formed by turbulent mixing of the lower layers of the atmosphere, resulting in a region of constant specific humidity and adiabatic lapse rates.
Date: September 1947
Creator: Lewis, William
Item Type: Refine your search to only Report
open access

Flight Investigation on a Fighter-Type Airplane of Factors Which Affect the Loads and Load Distributions on the Vertical Tail Surfaces During Rudder Kicks and Fishtails

Description: Note presenting results of a flight investigation conducted on a fighter-type airplane to determine the factors which affect the loads and load distributions on the vertical tail surfaces in maneuvers. An analysis is made of the data obtained in steady flight, rudder kicks, and fishtail maneuvers.
Date: August 1947
Creator: Boshar, John
Item Type: Refine your search to only Report
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