UNT Libraries Government Documents Department - 1,263 Matching Results

Search Results

prev Results: 1191 - 1214 next
open access

Flight and Test-Stand Investigation of High-Performance Fuels in Double-Row Radial Air-Cooled Engines 3: Comparison of Cooling Characteristics of Flight and Test-Stand Engines

Description: Report presenting the cooling characteristics of a 14-cylinder double-row radial air-cooled engines in a test stand and in flight. Three types of cooling tests were made for both engines: variable charge-air flow, variable cooling-air pressure drop, and variable fuel-air ratio. For the same operating conditions, the test-stand engine was found to run consistently cooler than the flight engine.
Date: February 1945
Creator: White, H. Jack; Blackman, Calvin C. & Dandois, Marcel
Item Type: Refine your search to only Report
open access

Effect of Fuel Volatility and Mixture Temperature on the Knocking Characteristics of a Liquid-Cooled Single-Cylinder Test Engine

Description: Report discussing an investigation to determine the effect of fuel volatility on the relation between mixture temperature and knock-limited performance on a liquid-cooled single-cylinder test engine. The mixture temperature at which the curve of indicated mean effective pressure plotted against mixture temperature becomes nonlinear was found to be independent of fuel volatility. The effects of vaporization on the knock-limited power output are also described.
Date: April 1945
Creator: Tauschek, Max J. & Lietzke, A. F.
Item Type: Refine your search to only Report
open access

Flight tests of NACA jet-propulsion exhaust stacks on the supermarine spitfire airplane

Description: Report presenting an investigation of the Supermarine Spitfire airplane equipped with exhaust stacks designed according to the jet-propulsion exhaust-stack system developed by the NACA. An increase in the high speed of the airplane of 6 mph was obtained as compared with the airplane equipped with the Rolls Royce exhaust system. Results regarding performance and exhaust-flame visibility are provided.
Date: December 1942
Creator: Turner, L. Richard & White, Maurice D.
Item Type: Refine your search to only Report
open access

The Preparation of 2, 2, 4, 4-Tetramethylpentane

Description: Report presenting seven distinct operations in the preparation of 2,2,4,4-tetramethylpentane, including the preparation of di-isobutylene hydrochloride, preparation of dimethylzinc, reaction of dimethylzinc in dry benzene with di-isobutylene hydrochloride, preliminary distillation of the reaction products, treatment of the first distillate with sodium and alcohol, final distillation after appropriate washing of the products, and recovery of the iodine in the zinc residues of II as methyl iodide. more
Date: May 1942
Creator: Drake, N. L.
Item Type: Refine your search to only Report
open access

Effect of Aromatics and Spark Advance on Thermal Efficiency

Description: Report presenting an analysis of experimental and theoretical data, which indicates that critical evaluation of fuel performance, especially economy, must be made in the engine. Data show that heating value is, from the aspect of fuel economy, not so important an aviation-fuel specification as believed. The knock ratings of fuels are affected by spark advance.
Date: September 1942
Creator: Gilbert, Mitchell
Item Type: Refine your search to only Report
open access

Determination of desirable lengths of Z- and channel-section columns for local-instability tests

Description: From Summary: "Local-instability tests of 24S-T aluminum-alloy formed Z- and channel-section columns were made in order to determine a length of test specimen that would avoid the increased strength associated with short lengths and also permit the occurrence of a convenient buckling pattern. The effect of column length on the critical compressive stress, on the average stress at maximum load, and on the number of half-waves of the buckling pattern is shown."
Date: October 1944
Creator: Heimerl, George J. & Roy, J. Albert
Item Type: Refine your search to only Report
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
open access

Tensile and Compressive Stress-Strain Curves and Flat-End Column Strength for Extruded Magnesium Alloy J-1

Description: "Two stress-strain curves are presented for both tension and compression. In addition, the results of a number of flat-end column tests are presented. The more apparent conclusions regarding extruded magnesium alloy J-1 are: it has a very low proportional limit in relation to the yield and ultimate strengths and it has a very low yield point for compression as compared with tension" (p. 1).
Date: April 1942
Creator: Rossman, Carl A.
Item Type: Refine your search to only Report
open access

Tests of 10 Inch 24S-T Aluminum-Alloy Shear Panels With 1-1/2 Inch Holes 2: Panels Having Holes With Notched Edges

Description: Report discusses the results of testing of 10-inch 24S-T aluminum alloy shear panels with 1.5 inch holes with notched edges to determine if a notch decreases the strength of the panel and if reinforcements can overcome the negative effects of the notch. The notch did appear to increase the stress concentration around the holes, but the lack of applicability to real-world scenarios is discussed.
Date: April 1944
Creator: Kuhn, Paul & Levin, L. Ross
Item Type: Refine your search to only Report
open access

The Effect of Artificial Aging on the Tensile Properties of Alclad 24S-T and 24S-T Aluminum Alloy

Description: "An experimental study was made to determine the effect of artificial aging on the tensile properties of alclad 24S-T and 24S-T aluminum-alloy sheet material. The results of the tests show that certain combinations of aging time and temperature cause a marked increase in the yield strength and a small increase in the ultimate strength; these increases are accompanied by a very large decrease in elongation. A curve is presented that shows the maximum yield strengths that can be obtained by aging… more
Date: August 1943
Creator: Kotanchik, Joseph N.; Woods, Walter & Zender, George W.
Item Type: Refine your search to only Report
open access

The Effect of Angle of Bend Between Plate Elements on the Local Instability of Formed Z-Sections

Description: "Thirty-nine Z-sections formed from 24S-T aluminum-alloy sheet with the angle of bend between the flanges and the web varying from 5 degrees to 120 degrees were tested as columns. Angles of bend from 30 degrees to 120 degrees had little or no effect on the critical stress or on the average stress at maximum load for local instability of the columns. The lengths of the columns were such that at angles of bend below 30 degrees they failed by Euler buckling" (p. 1).
Date: September 1944
Creator: Roy, J. Albert & Schuette, Evan H.
Item Type: Refine your search to only Report
open access

Progress Report on Fatigue of Spot-Welded Aluminum

Description: Report presenting a detailed account of approximately half of the work planned for a specified contract. The work called for fatigue tests on three simple but basic types of spot-welded test pieces made from 24S-T alclad. The primary purpose of the investigation was determining the mechanism of fatigue failures in the different types of test pieces.
Date: February 1943
Creator: Russell, H. W. & Jackson, L. R.
Item Type: Refine your search to only Report
open access

The Longitudinal Shear Strength Required in Double-Angle Columns of 24S-T Aluminum Alloy

Description: "Tests were made of riveted double-angle columns to determine the total rivet strength that is required to make these built-up columns develop the strength predicted by the standard column formulas. Results of the tests led to the conclusion that the required rivet strength may be calculated by the beam method of design" (p. 1).
Date: May 1943
Creator: Kuhn, Paul & Moggio, Edwin M.
Item Type: Refine your search to only Report
open access

Column and Plate Compressive Strengths of Aircraft Structural Materials: 24S-T Aluminum-Alloy Sheet

Description: "Column and plate compressive strengths of 24S-T aluminum-alloy sheet were determined both within and beyond the elastic range from tests of thin-strip columns and from local-instability tests of formed Z-end channel-section columns. These tests are the first of a series in an extensive research investigation to provide data on the structural strength of various aircraft materials. The results, which are presented in the form of curves and charts that may be used in the design and analysis of a… more
Date: June 1945
Creator: Lundquist, Eugene E.; Schuette, Evan H.; Heimerl, George J. & Roy, J. Albert
Item Type: Refine your search to only Report
open access

Column and plate compressive strengths of aircraft structural materials: extruded 24S-T aluminum alloy

Description: Report presenting column and plate compressive strengths of extruded 24S-T aluminum alloy determined both within and beyond the elastic range from tests of thin-strip columns and local-instability tests of H-, Z-, and channel-section columns. The tests are part of a research investigation to provide data on the structural strength of various aircraft materials. Results regarding compressive stress-strain curves and column and plate compressive strengths are provided.
Date: July 1945
Creator: Heimerl, George J. & Roy, J. Albert
Item Type: Refine your search to only Report
open access

Column and plate compressive strengths of aircraft structural materials: extruded 75S-T aluminum alloy

Description: Report presenting column and plate compressive strengths of extruded 75S-T aluminum alloy both within and beyond the elastic range from tests of thin-strip columns and local-instability tests of H-, Z-, and channel-section columns. The tests are part of an extensive research investigation to provide data on the structural strength of various aircraft materials. Results regarding compressive stress-strain curves and column and plate compressive strengths are provided.
Date: July 1945
Creator: Heimerl, George J. & Roy, J. Albert
Item Type: Refine your search to only Report
open access

Fatigue Characteristics of Spot-Welded 24S-T Aluminum Alloy

Description: Report presenting the results of an investigation of the fatigue characteristics of spot-welded 24S-T aluminum alloy. The static shear strength of spot welds in lap joints of 24S-T alclad increases with increasing sheet thickness for thicknesses in the range of 0.025 inch to 0.032 inch.
Date: June 1943
Creator: Russell, H. W.; Jackson, L. R.; Grover, H. J. & Beaver, W. W.
Item Type: Refine your search to only Report
open access

Tests of 10-Inch 24S-T Aluminum-Alloy Shear Panels With 1-1/2-Inch Holes

Description: Report discusses the results of testing on "10-inch shear panels of 24S-T aluminum alloy with 1.5 inch holes to determine the stress concentration at static rupture and the deformation characteristics" (from Summary). The strength of the perforated specimens is compared to the solid specimens and the critical stresses are computed. The stress at which permanent set occurs was also measured.
Date: June 1943
Creator: Kuhn, Paul & Levin, L. Ross
Item Type: Refine your search to only Report
open access

Knock-Limited Blending Characteristics of Blends of Triptane and 28-R Aviation Fuel

Description: "F-3 and F-4 knock data are presented for blends of 0, 20, 40, 60, and 80 percent by volume of triptane in 28-R reference fuel plus approximately 4.6 ml TEL per gallon in the final blends. For comparison of knock-limited performance, 28-R reference fuel containing 2.7 percent by volume of xylidines and leaded to 6 ml TEL per gallon is included. In order to provide information on temperature sensitivities, two sets of modified conditions were used in addition to the standard F-4 engine condition… more
Date: April 1944
Creator: Evvard, John C.; Imming, Harry S. & Genco, Russell S.
Item Type: Refine your search to only Report
open access

Knock-limited performance of blends of AN-F-28 fuel containing 2 percent aromatic amines 1

Description: Report presenting tests to investigate the effect of 2-percent additions of 11 aromatic amines on the knock-limited performance of AN-F-28 fuel. A total of 48 aromatic amines are being prepared for knock tests. Results regarding the knock-limited performance data, antiknock effectiveness, and knock-limited powers are provided.
Date: April 1944
Creator: Branstetter, J. Robert
Item Type: Refine your search to only Report
open access

Knock-limited performance of blends of AN-F-28 fuel containing 2 percent aromatic amines 3

Description: Report presenting tests to investigate the effect of 2-percent additions of nine aromatic amines on the knock-limited performance of AN-N-28 (28-R) fuel. The results of the testing of antiknock effectivneess of the 27 aromatic amines obtained to date in the program are also summarized.
Date: August 1944
Creator: Alquist, Henry E. & Tower, Leonard K.
Item Type: Refine your search to only Report
Back to Top of Screen