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Calculations of Economy of 18-Cylinder Radial Aircraft Engine With Exhaust-Gas Turbine Geared to the Crankshaft at Cruising Speed

Description: Report presenting calculations based on dynamometer test-stand data on an 18-cylinder radial engine made to determine the improvement in fuel consumption that can be obtained by gearing an exhaust-gas turbine to the engine crankshaft in order to increase the engine shaft work.
Date: December 1945
Creator: Hannum, Richard W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Calculations of the Performance of a Compression-Ignition Engine-Compressor Turbine Combination 1: Performance of a Highly Supercharged Compression-Ignition Engine

Description: From Summary: "Small high-speed single-cylinder compression-ignition engines were tested to determine their performance characteristics under high supercharging. Calculations were made on the energy available in the exhaust gas of the compression-ignition engines. The maximum power at any given maximum cylinder pressure was obtained when the compression pressure was equal to the maximum cylinder pressure. Constant-pressure combustion was found possible at an engine speed of 2200 rpm."
Date: December 1945
Creator: Sanders, J. C. & Mendelson, Alexander
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The effect of concentrated loads on flexible rings in circular shells

Description: Report presenting a method of making strain measurements on a series of circular cylinders with reinforcing rings, subjected to concentrated loads, in which the bending stiffness of the rings was varied systematically over a wide range. Results regarding the general remarks, bending-moment coefficient, and skin shear coefficients are provided.
Date: December 1945
Creator: Kuhn, Paul; Duberg, John E. & Griffith, George E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of Propeller-Axis Angle of Attack on Thrust Distribution Over the Propeller Disk in Relation to Wake-Survey Measurement of Thrust

Description: "Tests were made to investigate the variation of thrust distribution over the propeller disk with angle of pitch of the propeller thrust axis and to determine the disposition and the minimum number of rakes necessary to measure the propeller thrust. The tests were made at a low Mach number for a low and a high blade angle with the propeller operating at three small angles of pitch, and some of the tests were repeated at a higher Mach number. The data obtained show that, for small angles of pitc… more
Date: December 1945
Creator: Pendley, Robert E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effects of Wing and Nacelle Modifications on Drag and Wake Characteristics of a Bomber-Type Airplane Model

Description: Report presenting an investigation of a model of a large four-engine bomber to determine the effects of several wing and nacelle modifications on drag characteristics and airflow characteristics at the tail. Leading-edge gloves, trailing-edge extensions, and modified nacelle afterbodies were all tested. Results regarding flow characteristics at the wing during flight and at the landing condition, flow characteristics at the tail, and longitudinal stability characteristics are provided.
Date: December 1945
Creator: Neely, Robert H.; Fairbanks, Richard W. & Conner, D. William
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Fatigue Strength of Flush-Riveted Joints for Aircraft Manufactured by Various Riveting Methods

Description: Report presenting the results of an investigation to determine the fatigue strength of flush-riveted joints manufactured by different riveting methods. Tests were made on a direct stress fatigue machine at room temperature. The results showed that the fatigue strength of the joints was directly affected by the method of riveting used.
Date: December 1945
Creator: Maney, G. A. & Wyly, L. T.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A Metallurgical Investigation of a Large Forged Disc of Low-Carbon N-155 Alloy

Description: Report presenting a research program to ascertain the properties of promising heat-resistant alloys in the form of the large forgings required. The properties of a large disc of Low-Carbon N155 alloy in the hot-forged and stress-relieved condition have been determined by means of stress-rupture and creep tests for time periods up to 2000 hours at 1200, 1350, and 1500 degrees Fahrenheit. Results regarding hardness, short-time tensile properties, Charpy impact strength, rupture test characteristi… more
Date: December 1945
Creator: Freeman, J. W. & Cross, H. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Piston Heat-Transfer Coefficients Across an Oil Film in a Smooth-Walled Piston Reciprocating-Sleeve Apparatus

Description: Report presenting tests conducted with a heat-transfer apparatus that simulates the piston-cylinder-wall relation by means of a stationary, electrically heated, smooth-walled aluminum piston and a reciprocating steel sleeve separated by an oil film. Results regarding heat balance, temperature distribution, heat input, speed, average sleeve temperature, side thrust, piston-clearance oil-supply rate, and specific variable correlation are provided.
Date: December 1945
Creator: Manganiello, Eugene J. & Bogart, Donald
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Langley full-scale tunnel investigation of the factors affecting the directional stability and trim characteristics of a fighter-type

Description: Report presenting testing in the full-scale tunnel of the Grumman XF6F-4 airplane to investigate the factors that affect the directional stability and trim characteristics of a typical fighter-type airplane. Eight representative flight conditions were investigated in detail.
Date: November 1945
Creator: Sweberg, Harold H.; Guryansky, Eugene R. & Lange, Roy H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

A method of analysis of V-G records from transport operations

Description: From Summary: "A method has been developed for interpreting v-g records taken during the course of commercial transport operation. This method involves the utilization of fairly simple statistical procedures to obtain "flight envelopes," which predict that, on the average, in a stated number of flight hours, one value of airspeed will exceed the envelope, and one positive and one negative acceleration increment will exceed the envelope with equal probability of being experienced at any airspeed… more
Date: November 1945
Creator: Peiser, A. M. & Wilkerson, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Numerical Evaluation of the Wake-Survey Equations for Subsonic Flow Including the Effect of Energy Addition

Description: Report presenting direct-reading tables and charts for determining the drag or thrust coefficients from wake-survey measurements in the subsonic speed range. Additionally, numerical examples are provided using information from the tables.
Date: November 1945
Creator: Baals, Donald D. & Mourhess, Mary J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Preliminary Investigation of Deep Inducers as Separate Supercharger Components

Description: Report presenting a study of a family of three single-stage deep inducers designed to impart solid-body, or wheel, rotation in the entering air at constant rates along the axial depth of the inducers. The cast inducers tested were 4-inch axial depth with 24 blades, 4-inch depth with 12 blades, and 2-inch depth with 24 blades. Results regarding the cast inducers of the constant-angular-acceleration family, inducer section from the conventional impeller, and estimate of the inducer effect are pro… more
Date: November 1945
Creator: Ritter, William K. & Johnsen, Irving A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Quantitative analysis for aromatic amines in aviation fuels by ultraviolet spectrophotometry

Description: From Summary: "A method of quantitative analysis for individual aromatic amines or mixtures of aromatic amines in hydrocarbon fuel blends by spectrophotometric measurement of ultraviolet-light absorption is presented. The effect of the precision of the spectrophotometric measurements, the purity of the aromatic amine, photochemical decomposition of the amine, and the composition of the fuel on the accuracy of the analysis is discussed and the results of tests of the precision of the procedure a… more
Date: November 1945
Creator: Tischler, Adelbert O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The Rupture Test Characteristics of Six Precision-Cast and Three Wrought Alloys at 1700 Degrees and 1800 Degrees Fahrenheit

Description: Report presents the results of rupture tests conducted on nine alloys for periods of up to 400 hours duration at 1700 and 1800 degrees Fahrenheit. The nine alloys tested were 6059, Vitallium, 422-19, 61, X-40, X-50 (all of which are precision-cast), S590, S816, and Low Carbon N155 (all of which are wrought). Information about range in rupture strength, a metallographic examination, Vickers hardness surveys, and the general properties of the alloys during testing is also included.
Date: November 1945
Creator: Freeman, J. W.; Reynolds, E. E. & White, A. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Statistical Analysis of the Characteristics of Repeated Gusts in Turbulent Air

Description: Statistical methods were applied to acceleration and airspeed data obtained with the XC-35 airplane during flights in turbulent air within convective clouds in order to determine the characteristics of repeated or closely spaced gusts pertinent to design problems. Results indicated that, in turbulent air within convective cloud, gusts tend to be contiguous and are seldom found isolated in space. Over-all average spacing between repeated gusts was in good agreement with twice the average gust-gr… more
Date: November 1945
Creator: Moskovitz, A. I. & Peiser, A. M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Ultraviolet Absorption Spectra of Aromatic Amines in Isooctane and in Water

Description: Report discusses the results of a study of the ultraviolet absorption spectra in the 3200 A to 2500 A region of 27 aromatic amines in iscoctane and and in water solutions. Factors that affect the absorption spectra of aromatic amines were investigated, and the spectra in the two different solvents were compared. The main variables affecting the absorption are the nature of the solvent, the purity of the aromatic amines, and photochemical decomposition of the aromatic amines.
Date: November 1945
Creator: Tischler, Adelbert O. & Howard, J. Nelson
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

The application of data on strength under repeated stresses to the design of aircraft

Description: From Summary: "This report suggests a method whereby information on the strength under repeated stresses of aircraft materials or structural parts can be used in conjunction with information on service loadings as a means of comparing alternative designs."
Date: October 1945
Creator: Jackson, L. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Column and Plate Compressive Strengths of Aircraft Structural Materials: Extruded R303-T Aluminum Alloy

Description: "Column and plate compressive strengths of extruded R303-T aluminum alloy were determined both within and beyond the elastic range form tests of thin-strip columns and local-instability tests of H-, Z-, and channel-section columns. These tests are part of an extensive research investigation to provide data on the structural strength of various aircraft materials. The results are presented in the form of curves and charts that are suitable for use in the design and analysis of aircraft structure… more
Date: October 1945
Creator: Heimerl, George J. & Fay, Douglas P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Comparison between calculated and measured loads on wing and horizontal tail in pull-up maneuvers

Description: Report presenting comparisons of measured and calculated loads on the wing and horizontal tail in pull-up maneuvers for six airplanes over a range of weights. Good agreement was obtained between calculated and measured loads under certain circumstances, but the agreement in some cases was only fair, which may be attributed to poor quantitative knowledge of the aerodynamic parameters or to violation of the assumptions on which the method is based.
Date: October 1945
Creator: Matheny, Cloyce E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Correlation of exhaust-valve temperatures with engine operating conditions and valve design

Description: Report presenting a theory regarding engine-cooling variables from a previous report, which was used as a basis for the development of a semi-empirical equation to correlate exhaust-valve temperature with engine conditions. Results regarding the determination of constants, influences of operating variables on mean effective gas temperatures, thermal-resistance factor, and accuracy of correlating equation are provided.
Date: October 1945
Creator: Zipkin, M. A. & Sanders, J. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Cylinder Temperatures of Two Liquid-Cooled Aircraft Cylinders for Various Engine and Coolant Conditions

Description: Report presenting tests conducted with two liquid-cooled cylinders in order to isolate the effects of the various engine and coolant variables on cylinder temperatures and to obtain engine-cooling data required for a fundamental study of the heat-transfer processes in liquid-cooled engines. Cylinder temperatures were obtained for a large range of engine speeds, manifold pressures, carburetor-air temperatures, fuel-air ratios, spark advances, coolant-flow rates, average coolant temperatures, and… more
Date: October 1945
Creator: Manganiello, Eugene J. & Bernardo, Everett
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Flight Investigation of Boundary-Layer and Profile-Drag Characteristics of Smooth Wing Sections of a P-47D Airplane

Description: "In Mach range of 0.25 - 0.69, boundary-layer measurements were made on upper wing surface at 25% semi-span, pressure-distribution measurements made on upper surface at 63% semi-span, and wake surveys made at 63% semi-span. The minimum profile-drag coefficient of 0.0062 was indicated for smooth section at 63% semi-span. Critical mach number was exceeded by 0.04, but no compressibility shocks appeared. In slipstream, boundary layer transition occurred as far back as 20% chord on upper surface at… more
Date: October 1945
Creator: Zalovcik, John A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

In-Line Aircraft-Engine Bearing Loads 1: Crankpin-Bearing Loads

Description: Report presenting an investigation to develop a general method of determining bearing loads for crankpins. Results regarding the idea design of the bearing, bearing operating temperature, and the calculations for determining ideal operating conditions for V-type engines and production V-type engines are provided.
Date: October 1945
Creator: Shaw, Milton C. & Macks, E. Fred
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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