Flight Measurements of the Lateral Control Characteristics of Narrow-Chord Ailerons on the Trailing Edge of a Full-Span Slotted Flap (open access)

Flight Measurements of the Lateral Control Characteristics of Narrow-Chord Ailerons on the Trailing Edge of a Full-Span Slotted Flap

Note presenting results of flight tests made to determine the effect of flap deflection on the lateral control characteristics of a modified Brewster F2A-2 airplane equipped with partial-span narrow-chord ailerons on the trailing edge of a full-span NACA slotted flap. The results indicated that the effectiveness of the ailerons was greatly reduced at flap deflections greater than about 20 degrees.
Date: February 1947
Creator: Sawyer, Richard H.
Object Type: Report
System: The UNT Digital Library
Charts Showing Relations Among Primary Aerodynamic Variables for Helicopter-Performance Estimation (open access)

Charts Showing Relations Among Primary Aerodynamic Variables for Helicopter-Performance Estimation

"In order to facilitate solutions of the general problem of helicopter selection, the aerodynamic performance of rotors is presented in the form of charts showing relations between primary design and performance variables. By the use of conventional helicopter theory, certain variables are plotted and other variables are considered fixed. Charts constructed in such a manner show typical results, trends, and limits of helicopter performance" (p. 1).
Date: February 1947
Creator: Talkin, Herbert W.
Object Type: Report
System: The UNT Digital Library
Two-dimensional wind-tunnel investigation of four types of high-lift flap on an NACA 65-210 airfoil section (open access)

Two-dimensional wind-tunnel investigation of four types of high-lift flap on an NACA 65-210 airfoil section

Report presenting an investigation in the two-dimensional low-turbulence tunnel to develop flap configurations for maximum lift of the NACA 65-210 airfoil section equipped with four types of high-lift flap. Lift and pitching-moment data were obtained for the optimum configurations. Results regarding the optimum configurations for maximum lift, scale effect, effect of roughness, pitching moments, and comparison of flaps are provided.
Date: February 1947
Creator: Cahill, Jones F.
Object Type: Report
System: The UNT Digital Library
Formulas for additional mass corrections to the moments of inertia of airplanes (open access)

Formulas for additional mass corrections to the moments of inertia of airplanes

"Formulas are presented for the calculation of the additional mass corrections to the moments of inertia of airplanes. These formulas are of particular value in converting the virtual moments of inertia of airplanes or models experimentally determined in air to the true moments of inertia. A correlation of additional moments of inertia calculated by these formulas with experimental additional moments of inertia obtained from vacuum chamber tests of 40 spin-tunnel models indicates that formulas give satisfactory estimations of the additional moments of inertia" (p. 1).
Date: February 1947
Creator: Malvestuto, Frank S., Jr. & Gale, Lawrence J.
Object Type: Report
System: The UNT Digital Library
Spark-Timing Control Based on Correlation of Maximum-Economy Spark Timing, Flame-Front Travel, and Cylinder Pressure Rise (open access)

Spark-Timing Control Based on Correlation of Maximum-Economy Spark Timing, Flame-Front Travel, and Cylinder Pressure Rise

Note presenting an investigation conducted on a full-scale air-cooled cylinder in order to establish an effective means of maintaining maximum-economy spark timing with varying engine operating conditions. Variable fuel-air ratio runs were conducted in which relations were determined between the spark timing and basic factors in engine operation, flame-front travel, and cylinder pressure rise. An instrument for controlling spark timing was developed that automatically maintained maximum-economy spark timing with varying engine operating conditions.
Date: February 1947
Creator: Cook, Harvey A.; Heinicke, Orville H. & Haynie, William H.
Object Type: Report
System: The UNT Digital Library
Pressure-distribution measurements on the rotating blades of a single-stage axial-flow compressor (open access)

Pressure-distribution measurements on the rotating blades of a single-stage axial-flow compressor

Investigation of the pressure distribution about the mean-radius section of the rotating blades of a single-stage axial-flow compressor at a blade Mach number of 0.35. The results indicated that the maximum suction pressure for thin low-camber rotor blades was only slightly greater than for the isolated airfoil of the same section. Results regarding the performance of the compressor, performance of the pressure-transfer device, pressure distribution, critical Mach number, and lift characteristics are provided.
Date: February 1947
Creator: Runckel, Jack F. & Davey, Richard S.
Object Type: Report
System: The UNT Digital Library
Effect of Centrifugal Force on the Elastic Curve of a Vibrating Cantilever Beam (open access)

Effect of Centrifugal Force on the Elastic Curve of a Vibrating Cantilever Beam

Report presenting the results of a study to determine the effect of rotation on the dynamic-stress distribution in vibrating cantilever beams. Both theoretical and experimental results are obtained by means of stroboscopic photographs and strain gauges. Both types of results indicated that the introduction of centrifugal force had no effect on the maximum dynamic-stress locations in a vibrating cantilever beam fixed at the center of rotation within the investigated speed range.
Date: February 1947
Creator: Simpkinson, Scott H.; Eatherton, Laurel J. & Millenson, Morton B.
Object Type: Report
System: The UNT Digital Library
An investigation of the aerodynamic characteristics of a rotating axial-flow blade grid (open access)

An investigation of the aerodynamic characteristics of a rotating axial-flow blade grid

Report presenting the results of an experimental investigation of the aerodynamic characteristics of a rotating axial-flow blade grid with pressure-increasing effect. Several techniques of measurement were used, including pressure distribution measurements, pitot tubes, and hot wire wake surveys. Results regarding the lift and pressure drag of the blade sections, aerodynamic characteristics of the blade sections, profile drag, and static pressure are provided.
Date: February 1947
Creator: Weske, John R.
Object Type: Report
System: The UNT Digital Library
Foaming Volume and Foam Stability (open access)

Foaming Volume and Foam Stability

"A method of measuring foaming volume is described and investigated to establish the critical factors in its operation. Data on foaming volumes and foam stabilities are given for a series of hydrocarbons and for a range of concentrations of aqueous ethylene-glycol solutions. It is shown that the amount of foam formed depends on the machinery of its production as well as on properties of the liquid, whereas the stability of the foam produced, within specified mechanical limitations, is primarily a function of the liquid" (p. 1).
Date: February 1947
Creator: Ross, Sydney
Object Type: Report
System: The UNT Digital Library
A Comparison of the Lateral Motion Calculated for Tailless and Conventional Airplanes (open access)

A Comparison of the Lateral Motion Calculated for Tailless and Conventional Airplanes

Theoretical analysts of lateral dynamic motion of tailless and conventional airplanes was made for fighter and heavy transport. Their reactions to a lateral gust and control power required by each for simple maneuvers were determined and compared. Both types of airplanes require almost identical aileron control power to perform a given maneuver; tailless airplane requires about 1-2 to 1-3 directional control power of conventional airplane. Tailless airplane also shows greatest displacement for a given disturbance and has least damping in oscillatory mode.
Date: February 1947
Creator: Harper, Charles W. & Jones, Arthur L.
Object Type: Report
System: The UNT Digital Library
Performance of axial-flow fan and compressor blades designed for high loadings (open access)

Performance of axial-flow fan and compressor blades designed for high loadings

Report presenting an investigation to determine the effects of loading on the performance of axial-flow fan and compressor blades in a test blower. Results regarding verification of the two-dimensional design data and effects of blade roughness are provided.
Date: February 1947
Creator: Bogdonoff, Seymour M. & Herrig, L. Joseph
Object Type: Report
System: The UNT Digital Library
In-line aircraft-engine bearing loads 3: main-bearing loads (open access)

In-line aircraft-engine bearing loads 3: main-bearing loads

Report presenting the application of dimensional analysis to the computation of the main bearing of a V-type in-line aircraft engine. Two crankshafts have been considered, one designed for higher operating speed than the other. Two types of engines are considered: one for regular V-type engines and one for production V-type engines.
Date: February 1947
Creator: Shaw, Milton C. & Macks, E. Fred
Object Type: Report
System: The UNT Digital Library
Flight Measurements of Internal Cockpit Pressures in Several Fighter-Type Airplanes (open access)

Flight Measurements of Internal Cockpit Pressures in Several Fighter-Type Airplanes

Report presenting flight measurements of internal cockpit pressure in several fighter-type airplanes equipped with conventional or bubble canopies. Data are presented for variation in cockpit pressure with indicated airspeed and angle of sideslip for canopy-closed and canopy-open positions. A method is also included for predicting cockpit pressure in accelerated flight from measurements made in accelerated flight.
Date: February 1947
Creator: Danforth, Edward C. B., III & Reeder, John P.
Object Type: Report
System: The UNT Digital Library
Lifting-Surface-Theory Aspect-Ratio Corrections to the Lift and Hinge-Moment Parameters for Full-Span Elevators on Horizontal Tail Surfaces (open access)

Lifting-Surface-Theory Aspect-Ratio Corrections to the Lift and Hinge-Moment Parameters for Full-Span Elevators on Horizontal Tail Surfaces

Report presenting a limited number of lifting-surface-theory solutions with chordwise loading resulting from angle of attack, parabolic-arc camber, and flap deflection.
Date: February 1947
Creator: Swanson, Robert S. & Crandall, Stewart M.
Object Type: Report
System: The UNT Digital Library
Application of the Analogy Between Water Flow With a Free Surface and Two-Dimensional Compressible Gas Flow (open access)

Application of the Analogy Between Water Flow With a Free Surface and Two-Dimensional Compressible Gas Flow

From Introduction: "The development of the measuring apparatus and techniques is presented herein. The application of the analogy to flows through nozzles and about circular cylinders at subsonic velocities extending into supercritical range is also presented."
Date: February 1947
Creator: Orlin, W. James; Lindner, Norman J. & Bitterly, Jack G.
Object Type: Report
System: The UNT Digital Library
An Improved Continuous-Indicating Dew-Point Meter (open access)

An Improved Continuous-Indicating Dew-Point Meter

Note presenting the development of a continuous-indicating dew-point meter that automatically maintains a mirror surface at the dew point. The instrument was found to have an average accuracy of 1 degrees Fahrenheit over the range of 75 to -45 degrees. The accuracy of the instrument is uncertain at temperatures below 32 degrees Fahrenheit by the difference in vapor-solid and vapor-liquid equilibrium temperatures.
Date: February 1947
Creator: Friswold, Frank A.; Lewis, Ralph D. & Wheeler, R. Clyde, Jr.
Object Type: Report
System: The UNT Digital Library
Effects on Performance of Changing the Division of Work Between Increase of Angular Velocity and Increase of Radius of Rotation in an Impeller (open access)

Effects on Performance of Changing the Division of Work Between Increase of Angular Velocity and Increase of Radius of Rotation in an Impeller

Note presenting the effect on the performance of increasing the angular velocity of an impeller and consequently increasing the amount of work of compression resulting from the angular acceleration of the air in the impeller for four impellers in combination with a vaneless diffuser in a variable-component supercharger test rig of a range of tip speeds. Results regarding a comparison of performance, analysis of volume-flow limitations, and use of blade-inlet relative Mach number as a design parameter are provided.
Date: February 1947
Creator: Ginsburg, Ambrose; Ritter, William K. & Palasics, John
Object Type: Report
System: The UNT Digital Library
Reactions with steel of compounds containing chemical groups used in lubricant additives (open access)

Reactions with steel of compounds containing chemical groups used in lubricant additives

Report presenting an investigation of the chemical reactions between steel of a type used in aircraft-engine cylinder barrels and compounds containing reactive groups commonly found in lubricant additives. The products formed by reaction at temperatures from 400 to 650 degrees F were analyzed by reflection electron diffraction. Results regarding the diffraction patterns, a description of the products found, and correlation of the results with results form other investigations are provided.
Date: February 1947
Creator: Powell, Allen S.
Object Type: Report
System: The UNT Digital Library
Exhaust-valve temperatures in a liquid-cooled aircraft-engine cylinder as affected by engine operating variables (open access)

Exhaust-valve temperatures in a liquid-cooled aircraft-engine cylinder as affected by engine operating variables

Report presenting an investigation of the operating temperatures of sodium-cooled exhaust valves in a liquid-cooled cylinder for a large variety of engine conditions by means of a thermocouple embedded in the valve head. The engine operating variables that affected the valve temperature most for a given percentage change in the operating variable included fuel-air ratio, indicated mean effective pressure, compression ratio, and spark advance. Results regarding temperature variations in constant engine conditions, effect of engine operating variables on exhaust-valve temperatures, and exhaust-valve temperatures at which preignition was encountered are provided.
Date: February 1947
Creator: Sutor, Alois T.; Corrington, Lester C. & Dudugjian, Carl
Object Type: Report
System: The UNT Digital Library
Marine Exposure Tests on Stainless Steel Sheet (open access)

Marine Exposure Tests on Stainless Steel Sheet

Note presenting tidewater and weather-exposure tests on metals used in aircraft. Three distinct research projects were included: aluminum-rich alloys, magnesium-rich alloys, and stainless steels. This paper is a final report on the corrosion tests of stainless steel sheets included in the marine exposure program from 1938 to 1945.
Date: February 1947
Creator: Mutchler, Willard
Object Type: Report
System: The UNT Digital Library
Observations on the behavior of some noncircular aluminum alloy sections loaded to failure in torsion (open access)

Observations on the behavior of some noncircular aluminum alloy sections loaded to failure in torsion

Report presenting an investigation of the strength and stiffness characteristics of noncircular aluminum alloy sections loaded to failure in torsion. Results regarding torque-twist and torque-stress curves and stress-distribution diagrams are provided.
Date: February 1947
Creator: Moore, R. L.
Object Type: Report
System: The UNT Digital Library
Static and Dynamic Creep Properties of Laminated Plastics for Various Types of Stress (open access)

Static and Dynamic Creep Properties of Laminated Plastics for Various Types of Stress

Note presenting creep tests of five laminated plastics to determine the relative creep properties of these materials when subjected to various types of static and dynamic stresses. Results regarding the static tests, repeated stress tests, and creep tests are provided. The results indicated that the relative values of the mechanical properties of the laminates in tension, compression, bending, and torsion are not in the same order for all types of tests.
Date: February 1947
Creator: Marin, Joseph
Object Type: Report
System: The UNT Digital Library
Bearing strength of some sand-cast magnesium alloys (open access)

Bearing strength of some sand-cast magnesium alloys

Report presenting testing to determine the bearing strength characteristics of some magnesium-alloy sand castings and the relation between those and more commonly determined tensile properties. The primary sand-cast magnesium alloys of interest for aircraft design are AM403, AM260, and AM265. Results of all of the tension, compression, and shear tests are provided in tables.
Date: February 1947
Creator: Moore, R. L.
Object Type: Report
System: The UNT Digital Library
Device for Measuring Principal Curvature and Principal Strains on a Nearly Plane Surface (open access)

Device for Measuring Principal Curvature and Principal Strains on a Nearly Plane Surface

Note presenting a device which makes possible the measurement of principal extreme fiber bending strains over a circular area with a radius of 0.94 inch with a systematic error on 0.1-inch sheet of the order of 0.00003. Equations are presented for computing median fiber strains from the measured curvatures and strains at the surface and from the thickness of the sheet.
Date: February 1947
Creator: McPherson, A. E.
Object Type: Report
System: The UNT Digital Library