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NACA Wartime Reports
1,248
NACA Technical Notes
1,136
NACA Research Memorandums
1,037
Atomic Energy Commission Reports
721
NACA Advanced Restricted Reports
533
NACA Memorandum Reports
335
NACA Technical Reports
334
NACA Technical Memorandums
321
NACA Advanced Confidential Reports
246
United States Bureau of Mines Reports
226
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5,448 Matching Results
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Altitude performance and operational characteristics of 29-inch-diameter tail-pipe burner with several fuel systems and flame holders on J35 turbojet engine
From Summary: "An investigation of turbojet-engine thrust augmentation by means of tail-pipe burning has been conducted in the NACA Lewis altitude wind tunnel. Several fuel systems and flame holders were investigated in a 29-inch-diameter tail-pipe burner to determine the effect of fuel distribution and flame-holder design on tail-pipe-burner performance and operational characteristics over a range of simulated flight conditions. At an altitude of 5000 feet, the type of flame holder used had only a slight effect on the combustion efficiency."
Date:
November 8, 1949
Creator:
Conrad, E. William & Prince, William R.
Object Type:
Report
System:
The UNT Digital Library
An Investigation of the Characteristics of an Unswept Wing of Aspect Ratio 4.01 in the Langley 8-Foot High-Speed Tunnel
Report presenting an investigation of the characteristics of a low-aspect-ratio wing at high subsonic Mach numbers in the high-speed tunnel. The wing model had an NACA 65-108 airfoil section, an aspect ratio of 4.01, a taper ratio of 0.498, and no twist or dihedral. Results regarding normal-force characteristics, pitching-moment characteristics, and drag characteristics are provided.
Date:
November 8, 1949
Creator:
Bielat, Ralph P. & Cahn, Maurice S.
Object Type:
Report
System:
The UNT Digital Library
Model ditching investigation of the Douglas DC-4 and DC-6 airplanes
Report presenting the ditching characteristics of the Douglas DC-4 and DC-6 in a water tank. Dynamically similar models of 1/16 scale were used for the investigation, which was conducted in calm and rough water. The ditching characteristics and safest ditching procedures were determined by testing at various landing attitudes, speeds, and simulated conditions of damage.
Date:
November 8, 1949
Creator:
Fisher, Lloyd J. & Hoffman, Edward L.
Object Type:
Report
System:
The UNT Digital Library
Static longitudinal stability and control of a convertible-type airplane as affected by articulated- and rigid-propeller operation
Report presenting the results of an investigation in the full-scale tunnel of the static longitudinal stability and control of a convertible-type airplane as affected by articulated- and rigid-propeller operation. The investigation included force measurements for a large angle-of-attack range with the all-movable horizontal tail installed and removed.
Date:
November 7, 1949
Creator:
Lange, Roy H. & McLemore, Huel C.
Object Type:
Report
System:
The UNT Digital Library
Analysis and Experimental Observation of Pressure Losses in Ram-Jet Combustion Chambers
From Introduction: "Some experimental data on flame-holder pressure losses have been presented (reference 1 to 4). A theoretical analysis that assume a sudden enlargement of flow area was made at the NACA Lewis laboratory to determine the effect of flame-holder open area and combustion-chamber-inlet Mach number on the pressure losses across flame holders. The results of this analysis were then compared with experimental data obtained with several different flame-holder designs."
Date:
November 4, 1949
Creator:
Sterbentz, William H.
Object Type:
Report
System:
The UNT Digital Library
Analytical determination of effect of water injection on power output of turbine-propeller engine
From Introduction: "Water injection at the compressor inlet has been successfully used to increase the thrust of turbojet engines. References 1 and 2 indicate that the sea-level static thrust of a centrifugal-flow-type turbojet engine may be increased about 25 percent by use of liquid injection. Reference 3 indicates that greater thrust augmentation is possible at a compressor pressure ratio of 11 than of 4."
Date:
November 3, 1949
Creator:
Ross, Albert O. & Huppert, Merle C.
Object Type:
Report
System:
The UNT Digital Library
Corrosion Investigations of Redox Pilot Plant Equipment at Oak Ridge National Laboratories
The following report is based on the observations made during a visit to the Oak Ride National Laboratories of their Redox Pilot Plant equipment.
Date:
November 3, 1949
Creator:
Koenig, W. W.
Object Type:
Report
System:
The UNT Digital Library
General Characteristics of a Airspeed System using Fuselage Static Vents on a Swept-Wing Airplane
"Studies have been made by the NACA wing-flow method of the use of fuselage static orifices between the wing and tail of a swept-wing airplane for possible application to service airspeed installations. The tests were made at zero angle of attack. The results indicate that, although the maximum errors are large, these locations are usable from the consideration that the local Mach numbers at the locations studied are sensitive to variation of the true Mach number within the test Mach number range of 0.7 to 1.2" (p. 1).
Date:
November 3, 1949
Creator:
Johnston, J. Ford & O'Bryan, Thomas C.
Object Type:
Report
System:
The UNT Digital Library
Vibration of loosely mounted turbine blades during service operation of a turbojet engine with centrifugal compressor and straight-flow combustion chambers
Report presenting an experimental investigation to determine the vibration characteristics of loosely mounted turbine blades during service operation of a turbojet engine. High-temperature strain gages were used to measure turbine-blade vibrations. Results regarding oscillograph records, critical speeds and frequencies, vibratory-stress levels, and effect of tightening the blade mount are provided.
Date:
November 3, 1949
Creator:
Morgan, W. C.; Kemp, R. H. & Manson, S. S.
Object Type:
Report
System:
The UNT Digital Library
The Determination of Uranium by Potentiometric Titration with Ferric Sulfate
Abstract: "A method for the potentiometric titration of uranium with ferric sulfate is described. This method provides a rapid and accurate way of determining the element in solutions free from interfering ions. Application of the method to analysis of pure uranium compounds and to uranium recovered from contaminated solutions by suitable procedures is briefly discussed."
Date:
November 2, 1949
Creator:
Grimes, W. R.
Object Type:
Report
System:
The UNT Digital Library
Aerodynamic Characteristics of a Wing With Quarter-Chord Line Swept Back 45 Degrees, Aspect Ratio 6, Taper Ratio 0.6, and NACA 65A006 Airfoil Section
Report discussing a wing-alone and wing-fuselage configuration with particular characteristics as part of a series of tests of wings using the transonic-bump test technique. Lift, drag, pitching moment, and root bending moment were obtained for the configurations. The effective downwash angles and dynamic-pressure characteristics in the tail region are also described.
Date:
November 1, 1949
Creator:
Goodson, Kenneth W. & Few, Albert G., Jr.
Object Type:
Report
System:
The UNT Digital Library
Annular-jet ejectors
From Summary: "Included in the report are the results of total-pressure surveys made at downstream ends of the mixing tubes."
Date:
November 1949
Creator:
Reid, Elliott G.
Object Type:
Report
System:
The UNT Digital Library
A Comparison of Wing Loads Measured in Flight on a Fighter-Type Airplane by Strain-Gage and Pressure Distribution Methods
Note presenting pressure distribution measurements made on the wing of a fighter-type airplane to determine the span loading and to compare center-of-pressure results with those obtained by strain-gage measurements on the same airplane during a previous flight investigation. Flight tests were all made at a pressure altitude of about 30,000 feet and covered a Mach number range from approximately 0.35 to 0.81. Results regarding additional air load, spanwise center of pressure of additional air load, basic air load distribution, and span loading during a stall and buffeting are provided.
Date:
November 1949
Creator:
Aiken, William S., Jr. & Howard, Donald A.
Object Type:
Report
System:
The UNT Digital Library
Corrosion Rates of Mild and Stainless Steels Exposed in Redox Stream IAW : (ANL, June 1, 1948 Flowsheet)
Introduction: In order to determine the relative corrosion resistance of welded mild and stainless steels in Redox Stream IAW neutralized to pH 0, 2, and 10 a test program, described below, has been carried out.
Date:
November 1, 1949
Creator:
Koenig, W. W.
Object Type:
Report
System:
The UNT Digital Library
Critical Stress of Ring-Stiffened Cylinders in Torsion
"A chart in terms of nondimensional parameters is presented for the theoretical critical stress in torsion of simply supported cylinders stiffened by identical equally spaced rings of zero torsional stiffness. The results are obtained by solving the equation of equilibrium by means of the Galerkin method. Comparison of the theoretical results with experimental results indicates that ring-stiffened cylinders buckle, on the average, at a buckling stress about 15 percent below the theoretical buckling stress" (p. 1).
Date:
November 1949
Creator:
Stein, Manuel; Sanders, J. Lyell, Jr. & Crate, Harold
Object Type:
Report
System:
The UNT Digital Library
Data on the Compressive Strength of 75S-T6 Aluminum-Alloy Flat Panels Having Small, Thin, Widely Spaced, Longitudinal Extruded Z-Section Stiffeners
"The experimental results are presented for the second part of an investigation of the compressive strength of 75S-T6 aluminum-alloy flat panels with longitudinal extruded Z-section stiffeners. This part of the investigation is particularly concerned with panels in which the ratio of the thickness of the stiffener material to the skin material is small and the ratio of stiffener spacing to skin thickness is large" (p. 1).
Date:
November 1949
Creator:
Hickman, William A. & Dow, Norris F.
Object Type:
Report
System:
The UNT Digital Library
Diamond Drilling at the Boston Consolidated Copper Mine, Salt Lake County, Utah
Report issued by the Bureau of Mines over diamond-drilling projects in Salt Lake County. The geology, physical features, and history of the mines are presented. This report includes tables, maps, illustrations, and photographs.
Date:
November 1949
Creator:
Jones, Robert L. & Wilson, Stephen R.
Object Type:
Report
System:
The UNT Digital Library
Effect of Forebody Warp and Increase in Afterbody Length on the Hydrodynamic Qualities of a Flying-Boat Hull of High Length-Beam Ratio
Note presenting an investigation with the aim of achieving improved hydrodynamic qualities for flying boats, which involved determining the combined effect of a warped forebody and extended afterbody on the hydrodynamic characteristics of a full having a basic length-beam ratio of 15. Results regarding longitudinal stability, landing stability, spray characteristics, and landings in waves are provided.
Date:
November 1949
Creator:
Kapryan, Walter J.
Object Type:
Report
System:
The UNT Digital Library
Influence of wing flexibility on force-time relation in shock strut following vertical landing impact
Report presenting testing to determine the force developed in a shock strut as a function of the flexibility of the attached wing structure. Both the experiment and analysis indicated that wing flexibility had some effect on the shape and peak value of the force-time curve in a shock strut.
Date:
November 1949
Creator:
McPherson, Albert E.; Evans, J., Jr. & Levy, Samuel
Object Type:
Report
System:
The UNT Digital Library
An introduction to the physical aspects of helicopter stability
"In order to provide engineers interested in rotating-wing aircraft but with no specialized training in stability theory some understanding of the factors that influence the flying qualities of the helicopter, an explanation is made of both the static stability and the stick-fixed oscillation in hovering and forward flight in terms of fundamental physical qualities. Three significant stability factors - static stability with angle of attack, static stability with speed, and damping due to a pitching or rolling velocity - are explained in detail" (p. 1).
Date:
November 1949
Creator:
Gessow, Alfred & Amer, Kenneth B.
Object Type:
Report
System:
The UNT Digital Library
Investigation of the McCormick Chromite Mine, Tuolumne County, California
Report issued by the Bureau of Mines over investigations on the McCormick chromite mine. Descriptions of the chromite deposits are presented. Details about the development made in the mine are listed. This report includes tables, maps, and illustrations.
Date:
November 1949
Creator:
Shattuck, John R. & Ricker, Spangler
Object Type:
Report
System:
The UNT Digital Library
Investigation of the Young American Lead-Zinc Deposit, Stevens County, Washington
Report issued by the Bureau of Mines over investigations of mines in Stevens County, Washington. The history, geology, and physical features of the mines are presented. This report includes tables, maps, and illustrations.
Date:
November 1949
Creator:
Hundhausen, Robert J.
Object Type:
Report
System:
The UNT Digital Library
Longitudinal flying qualities of several single-rotor helicopters in forward flight
Report presenting flight-test measurements and corresponding pilot's opinions of the forward-flight longitudinal flying qualities characteristics of several single-rotor helicopters. The most important consideration for satisfactory characteristics appears to be the prevention of prolonged stick-fixed divergent tendencies. Results regarding the characteristics appreciated, theoretical analysis of pull-up characteristics, and practical requirements are provided.
Date:
November 1949
Creator:
Gustafson, F. B.; Amer, Kenneth B.; Haig, C. R. & Reeder, J. P.
Object Type:
Report
System:
The UNT Digital Library
Measurement of Oil-Film Pressures in Journal Bearings under Constant and Variable Loads
"In a study of journal bearings, the measurement of the oil-film strength produces some significant information. A new instrument is described by means of which the pressure of the oil film in bearings (under constant or alternating load) can be measured and recorded. With this device, the pressure distribution in the lubricating film of a bearing bushing was measured (under different operating conditions on a journal bearing) in the pulsator-bearing-testing machine" (p. 1).
Date:
November 1949
Creator:
Buske, A. & Rolli, W.
Object Type:
Report
System:
The UNT Digital Library