UNT Libraries Government Documents Department - 74 Matching Results

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An Analysis of the Effects of Wing Aspect Ratio and Tail Location on Static Longitudinal Stability Below the Mach Number of Lift Divergence

Description: "An analysis is presented of the influence of wing aspect ratio and tail location on the effects of compressibility upon static longitudinal stability. The investigation showed that the use of reduced wing aspect ratios or short tail lengths leads to serious reductions in high-speed stability and the possibility of high-speed instability" (p. 1).
Date: January 9, 1948
Creator: Axelson, John A. & Crown, J. Conrad
Item Type: Refine your search to only Report
open access

Analysis of variation of piston temperature with piston dimensions and undercrown cooling

Description: From Summary: "A theoretical analysis is presented that permits estimation of the changes in piston-temperature distribution induced by variations in the crown thickness, the ring-groove-pad thickness, and the undercrown surface heat-transfer coefficient. The analysis consists of the calculation of operating temperatures at various points in the piston body on the basis of the experimentally determined surface heat-transfer coefficients and boundary-region temperatures, as well as arbitrarily s… more
Date: January 15, 1948
Creator: Sanders, J. C. & Schramm, W. B.
Item Type: Refine your search to only Report
open access

Charts for the Analysis of One-Dimensional Steady Compressible Flow

Description: Report presenting charts of dimensionless parameters to facilitate the computation involved in the solution of equations of one-dimensional steady flow of a compressible field. The charts can be used for analyses involving constant or variable specific heats in the subsonic and supersonic ranges.
Date: January 1948
Creator: Turner, L. Richard; Addie, Albert N. & Zimmerman, Richard H.
Item Type: Refine your search to only Report
open access

Comparison of computed performance of composite power plants using 18-cylinder aircraft engines with 62 degrees and 40 degrees valve overlap

Description: Report presenting calculations based on experimental data for 18-cylinder, radial aircraft engines with different nominal valve overlaps to compare the performance of two composite power plants using the engines. The composite unit included a steady-flow turbine and an auxiliary supercharger mounted on a common shaft and geared to the engine crankshaft. Results regarding the reciprocating-engine component, composite engine, effect of turbine characteristics, and performance with afterburning ar… more
Date: January 1948
Creator: Kaufman, Samuel J. & Boman, David S.
Item Type: Refine your search to only Report
open access

Cyclic Engine Test of Cast Vitallium Turbine Buckets 2

Description: Memorandum presenting an investigation conducted to provide data that may be used to correlate the engine service performance of cast Vitallium turbine buckets with metallurgical properties. Data were obtained from four turbine wheels of Timken alloy with cast Vitallium buckets. Examination of 12 broken buckets indicated that 8 of the failures were probably caused by fatigue and 4 by impact with pieces of other broken buckets.
Date: January 12, 1948
Creator: Farmer, J. Elmo; Deutsch, George C. & Sikora, Paul F.
Item Type: Refine your search to only Report
open access

Cylinder-temperature and cooling-air-pressure instrumentation for air-cooled-engine cooling investigations

Description: "A description of the types and the locations of pressure tubes and thermocouples satisfactorily used by NACA in multicylinder-engine cooling investigations is presented. The advantages and disadvantages of the various types of pressure tube and thermocouple are discussed with regard to reliability, durability, and ease of installation" (p. 1).
Date: January 1948
Creator: Valerino, Michael F. & Kaufman, Samuel J.
Item Type: Refine your search to only Report
open access

The Determination of Uranium in K-65 (Gangue Lead Cake)

Description: The major problems in this determination are the extraction of X from the sample and the isolation of the extracted X. The application of various analytical methods to these two problems indicates that the current method of analysis yields values which may be as much as 15% high. The current method of analysis is subject to positive and negative errors. The magnitude of these errors varies with techniques and with sample composition. The recommend method, although longer, is believed to be free… more
Date: January 1, 1948
Creator: Stevenson, J.W.
Item Type: Refine your search to only Report
open access

Development of cast aluminum alloys for elevated-temperature service

Description: Report presenting an experimental investigation to develop an aluminum alloy for service at elevated temperatures. The investigation was divided into three parts: (1) The effects of heat treatment and exposure to elevated temperatures on the tensile properties of alloys cooled to room temperature, (2) the effect of alloy additions on the room temperature and elevated-temperature properties of aluminum, 6-percent-magnesium alloys, and (3) the improvement in high-temperature creep properties of s… more
Date: January 1948
Creator: Hodge, Webster; Eastwood, L. W.; Lorig, C. H. & Cross, H. C.
Item Type: Refine your search to only Report
open access

Dislocation Theory of the Fatigue of Metals

Description: Note presenting a dislocation theory of fatigue failure for annealed solid solutions. An equation giving the dependence of the number of cycles for failure on the stress, the temperature, the material parameters, and the frequency is derived for uniformly stressed specimens. The equation is found to be in quantitative agreement with the data.
Date: January 1948
Creator: Machlin, E. S.
Item Type: Refine your search to only Report
open access

The Distribution of Radioactivity in the Mouse Following Administration of Dibenzanthracene Labeled in the 9 and 10 Positions with Carbon Fourteen

Description: Dibenzanthracene, labeled in the 9 and 10 positions with carbon fourteen has been administered to mice intravenously and by stomach tube as an aqueous colloid, and intraperitoneally, subcutaneously, and by stomach tube in tricaprylin solution. The distribution of radioactivity in the mice at various time intervals after administration of the carcinogen has been determined. The radioactivity is rapidly eliminated, largely through the feces, and ordinarily very little is absorbed. The distributio… more
Date: January 30, 1948
Creator: Heidelberger, Charles & Jones, Hardin, B.
Item Type: Refine your search to only Article
open access

Ditching Tests of a 1/8-Scale Model of the Chance Vought XF6U-1 Airplane, TED No. NACA DE319

Description: Tests were made with a 1/8-scale dynamically similar model of the Chance Vought XF6U-1 airplane to study its behavior when ditched. The model was ditched in calm water at the Langley tank no. 2 monorail. Various landing attitudes, speeds, and conditions of damage were simulated. The behavior of the model was determined from visual observations, by recording time histories of the accelerations, and by taking motion pictures of the ditchings. From the results of the tests it was concluded that th… more
Date: January 19, 1948
Creator: Fisher, Lloyd J., Jr. & McBride, Ellis E.
Item Type: Refine your search to only Report
open access

Effect of Inlet Air Distortion on the Steady-State and Surge Characteristics of an Axial-Flow Turbojet Compressor

Description: "An investigation was conducted in an altitude test chamber to determine the effects of inlet airflow distortion on the compressor steady-state and surge characteristics of a high-pressure ratio, axial-flow turbojet engine. Circumferential-type inlet flow distortions were investigated, which covered a range of distortion sector angles from 20 deg to 168 deg and distortion levels up to 22 percent. The presence of inlet airflow distortions at the compressor face resulted in a substantial increase… more
Date: January 2, 1948
Creator: Ciepluch, Carl C.
Item Type: Refine your search to only Report
open access

Effect of Length-Beam Ratio on the Aerodynamic Characteristics of Flying-Boat Hulls without Wing Interference

Description: Contains experimental results of an investigation of the aerodynamic characteristics of a family of flying boat hulls of length beam ratios 6, 9, 12, and 15 without wing interference. The results are compared with those taken on the same family of hulls in the presence of a wing.
Date: January 16, 1948
Creator: Lowry, John G. & Riebe, John M.
Item Type: Refine your search to only Report
open access

Evaluation of Gust and Draft Velocities from Flights of P-61C Airplanes within Thunderstorms May 13, 1947 to May 29, 1947 at Clinton County Army Air Field, Ohio

Description: The gust and draft velocities evaluated from records of NACA instruments installed in P-61C airplanes participating in thunderstorm flights at Clinton County Army Air Field, Ohio, from May 13 to May 29, 1947 are presented.
Date: January 2, 1948
Creator: Tolefson, Harold B.
Item Type: Refine your search to only Report
open access

Experimental investigation at supersonic speeds of twin-scoop duct inlets of equal area I : an inlet enclosing 61.5 percent of the maximum circumference of the forebody

Description: Report presenting tests at Mach numbers between 1.36 and 2.01 of a twin-scoop air intake enclosing 61.5 percent of the maximum circumference of a body of revolution and located five forebody diameters behind the apex, which showed that the total pressure recovered after diffusion was about 10 percent greater than that attained in previous tests with an annular entrance of the same area.
Date: January 21, 1948
Creator: Davis, Wallace F. & Goldstein, David L.
Item Type: Refine your search to only Report
open access

Flight Characteristics at Low Speed of Delta-Wing Models

Description: Report presenting an investigation to obtain a survey of the flying characteristics at low speeds of models with low-aspect-ratio delta wings. Four models with triangular plan-form sweptback wings and five models with the tips cut off to give taper ratios were tested. Results regarding the stability and control characteristics of each of the models is provided.
Date: January 13, 1948
Creator: McKinney, Marion O., Jr. & Drake, Hubert M.
Item Type: Refine your search to only Report
open access

Flight Investigation of a 20-Inch-Diameter Steady-Flow Ram Jet

Description: Memorandum presenting a flight investigation conducted on a 20-inch-diameter steady-flow ramjet at a range of altitudes and free-stream Mach numbers. Results regarding the variation of combustion efficiency with fuel-air ratio and pressure altitude, effects of combustion-chamber-inlet velocity, and altitude on the operating range of fuel-air ratio are provided. The ramjet unit operated smoothly over the entire range of velocities and altitudes with the exception of occasional rough operation at… more
Date: January 14, 1948
Creator: Disher, John H.
Item Type: Refine your search to only Report
open access

Flight Measurements of Lateral and Directional Stability and Control Characteristics of the Grumman F8F-1 Airplane

Description: "This paper presents the results of flight tests to determine the lateral and directional stability and control characteristics of the Grumman F8F-1 airplane with three vertical-tail configurations. The data presented herein have no bearing on the performance characteristics of the airplane, which were not measured but which were considered to be exceptionally good. The conclusions reached regarding the lateral and directional stability and control characteristics are summarized in this report"… more
Date: January 29, 1948
Creator: Crane, H. L. & Reeder, J. P.
Item Type: Refine your search to only Report
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