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Congressional Research Service Reports
115
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99
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23
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264 Matching Results
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Characteristics of six propellers including the high-speed range
This investigation is part of an extensive experimental study that has been carried out at full scale in the NACA 20-foot tunnel, the purpose of which has been to furnish information in regard to the functioning of the propeller-cowling-nacelle unit under all conditions of take-off, climbing, and normal flight. This report presents the results of tests of six propellers in the normal and high-speed flight range and also includes a study of the take-off characteristics.
Date:
June 4, 1936
Creator:
Theodorsen, Theodore; Stickle, George W. & Brevoort, M. J.
System:
The UNT Digital Library
Tank Tests of the Effect of Rivet Heads, etc., on the Water Performance of a Seaplane Float, Special Report
"A 1/3.5 full-size model of the Mark V float of the Bureau of Aeronautics, Navy Department, was tested in the NACA tank both with smooth painted bottom surfaces and with roundhead rivets, plate laps, and keel plates fitted to simulate the actual bottom of a metal float. The augmentation in water resistance due to the added roughness was found to be from 10-12% at the hum speed and from 12-14% at high speeds. The effect of the roughness of the afterbody was found to be negligible except at high trims" (p. 1).
Date:
June 4, 1936
Creator:
Parkinson, J. B. & Robertson, J. B., Jr.
System:
The UNT Digital Library
Experimental Investigation of Wind-Tunnel Interference on the Downwash Behind an Airfoil
"The interference of the wind-tunnel boundaries on the downwash behind an airfoil has been experimentally investigated and the results have been compared with the available theoretical results for open-throat wind tunnels. As in previous studies, the simplified theoretical treatment that assumes the test section to be an infinite free jet has been shown to be satisfactory at the lifting line. The experimental results, however, show that this assumption may lead to erroneous conclusions regarding the corrections to be applied to the downwash in the region behind the airfoil where the tail surfaces are normally located" (p. 689).
Date:
June 4, 1937
Creator:
Silverstein, Abe & Katzoff, S.
System:
The UNT Digital Library
Effects of Combinations of Aspect Ratio and Sweepback at High Subsonic Mach Numbers
Report discussing an investigation to determine the effects of sweepback and low aspect ratio on the aerodynamic characteristics of a wing at high subsonic Mach numbers. Tests were performed at aspect ratios of 2, 3, and 5 and sweepback angles of 0, 30, and 45 degrees. Generally, sweepback and low aspect ratio were found to both delay and lessen the effects of compressibility.
Date:
June 4, 1947
Creator:
Adler, Alfred A.
System:
The UNT Digital Library
Theoretical study of air forces on an oscillating or steady thin wing in a supersonic main stream
From Summary: "A theoretical study, based on the linearized equations of motion for small disturbance, is made of the air forces on wings of general plan forms moving forward at a constant supersonic speed. The boundary problem is set up for both the harmonically oscillating and the steady conditions. Two types of boundary conditions are distinguished, which are designated "purely supersonic" and "mixed supersonic." the method is illustrated by applications to a number of examples for both the steady and the oscillating conditions."
Date:
June 4, 1947
Creator:
Garrick, I. E. & Rubinow, S. I.
System:
The UNT Digital Library
Recommendations: Recovery of product from 234-5 Building miscellaneous liquid wastes
None
Date:
June 4, 1951
Creator:
Cooper, V.R.
System:
The UNT Digital Library
The Synthetic Liquid Fuel Potential of Iowa
Report documenting the suitability of Iowa for plant locations to produce synthetic liquid fuels, based on raw materials. In this study, the only raw material considered in this survey was coal.
Date:
June 4, 1951
Creator:
Ford, Bacon, and Davis
System:
The UNT Digital Library
Neutron Streaming in a Cylindrical Cavity
The free streaming of neutrons in a cylindrical cavity is investigated. Using experimental data for the flux distribution along the walls, the direct beam hole loss and leakage into the target from the lattice is estimated for the MTA system.
Date:
June 4, 1952
Creator:
LeLevier, R.
System:
The UNT Digital Library
Single Bend Tests on Welded Zirconium and Zirconium-Tin Alloys
Introduction: "Since it has been found that zirconium and zirconium-tin alloys may be embrittled by certain heat treatments, it was decided to determine if welding of these materials affects their ductility in any way. A single bend test in both the longitudinal and transverse directions was used for evaluation of the variables considered."
Date:
June 4, 1952
Creator:
Hoge, H. R.
System:
The UNT Digital Library
A Brief Hydrodynamic Investigation of a 1/24-Scale Model of the DR-77 Seaplane
From Summary: "A limited investigation of a 1/24-scale dynamically similar model of the Navy Bureau of Aeronautics DR-77 design was conducted in Langley tank no. 2 to determine the calm-water take-off and the rough-water landing characteristics of the design with particular regard to the take-off resistance and the landing accelerations. During the take-off tests, resistance, trim, and rise were measured and photographs were taken to study spray. During the landing tests, motion-picture records and normal-acceleration records were obtained."
Date:
June 4, 1953
Creator:
Fisher, Lloyd J. & Hoffman, Edward L.
System:
The UNT Digital Library
Non-Destructive Testing of Uranium Slugs. Summary Report through May 1953
None
Date:
June 4, 1953
Creator:
Hochschild, Richard
System:
The UNT Digital Library
Process Test MR-105-13, Determination of the value of zinc insert extensions in preventing sticking front nozzle inserts
None
Date:
June 4, 1953
Creator:
Hardin, A. K.
System:
The UNT Digital Library
Studies of the speed stability of a tandem helicopter in forward flight
Flight-test measurements, related analytical studies, and corresponding pilots' opinions of the speed stability of tandem-rotor helicopter are presented. An undesirable instability, evidenced by rearward stick motion with increasing forward speed at constant power, is indicated to be caused by variations with speed of the front-rotor downwash at the rear rotor. An analytical expression for predicting changes in speed stability caused by changes in rotor geometry is derived and constants for use with the analytical expression are presented in chart form. Means for improving stability with speed are studied both analytically and experimentally. The test results also give some information as to the flow conditions at the rear rotor.
Date:
June 4, 1953
Creator:
Tapscott, Robert J. & Amer, Kenneth B.
System:
The UNT Digital Library
Technical activities report for May 1953: Physics Unit, Applied Research Sub-Section
In this report, a brief discussion is given for each of the following activities under study during this period: xenon generator; C{sup 12} cross sections; critical mass problems (for process vessels in Bldg. 231); neutron beam catcher design; neutron diffraction spectrometer; beta spectrometer; hollow slug program; instrumentation; blackness corrections; exponential pile measurements with small slug size; critical lattice experiments; lattice theory; and radiation damage.
Date:
June 4, 1953
Creator:
Faulkner, J. E.; Davenport, D. E. & Duvall, G. E.
System:
The UNT Digital Library
Experiments on Nucleon-Nucleon Scattering with 280 MEV PolarizedProtons
None
Date:
June 4, 1954
Creator:
Chamberlain, Owen; Donaldson, Robert; Segre, Emilio; Tripp,Robert; Wiegand, Clyde & Ypsilantis, Thomas
System:
The UNT Digital Library
[Imperial Sugar Company Estimated Daily Cash Balance: June 4, 1954]
Daily cash report for Imperial Sugar Company including a list of large withdrawals for the months surrounding the date showing the daily expenses and estimated balance for each entry. It also lists scheduled payments for bank loans.
Date:
June 4, 1954
Creator:
Imperial Sugar Company
System:
The Portal to Texas History
The Rf System of the Bevatron
Report discussing details of the design for the Bevatron at the University of California Radiation Laboratory. The Bevatron is a "6-billion-electron-volt (Bev) proton synchotron. This device will receive a 10-million-electron-volt (Mev) proton beam from a linear accelerator, and further accelerate a reasonable percentage of these protons, at a nominally constant radius of 600 inches, to a final energy greater than 6 Bev."
Date:
June 4, 1954
Creator:
Winningstad, C. Norman
System:
The UNT Digital Library
Temporary storage of B25 and COS solutions in vault 225
None
Date:
June 4, 1954
Creator:
Smith, A. E. & Muller, G. M.
System:
The UNT Digital Library
Closed-Loop Level Indicator for Corrosive Liquids Operating at High Temperatures
Report issued by the Oak Ridge National Laboratory discussing the development of a closed-loop control system. As stated in the statement, "the purpose of this thesis was to design and build a closed-loop control system to be used as an indicator of the level of high temperature liquids contained in a tank" (p. 1). This report includes tables, illustrations, and photographs.
Date:
June 4, 1956
Creator:
Southern, A. L.
System:
The UNT Digital Library
An experimental investigation of sting-support effects on drag and a comparison with jet effects at transonic speeds
Various dummy stings were tested on the rear of a related series of afterbody shapes for Mach numbers from 0.80 to 1.10 and Reynolds numbers based on body length from 15.0 x 16 to the 6th power to 17.4 x 10 to the 6th power. A method is presented whereby approximate sting interference corrections can be made to models having afterbody shapes and sting supports similar to those of these tests if the Reynolds numbers are of the same order of magnitude and a turbulent boundary layer exists at the model base. Also presented is an analysis of jet duplication by use of a sting.
Date:
June 4, 1956
Creator:
Cahn, Maurice S.
System:
The UNT Digital Library
Observed Net Heat Loss from the HRT High-Pressure System
An estimate has been obtained of the heat that should be generated in the HRT core in order to hold the system at operating temperature under no-load conditions. This estimate was made by measuring the feed-water rate to the package boiler during an oxygenated water rung. Results are summarized.
Date:
June 4, 1957
Creator:
Van Winkle, R. & Wiethaup, R. R.
System:
The UNT Digital Library
Performance of HRT Charcoal Beds
The expected performance of the HRT carbon beds was calculated for various reactor operating conditions. the calculations indicated that the flow rate of sweep gas will have to be limited to prevent excessive activity discharge. Data on activity discharge are included.
Date:
June 4, 1957
Creator:
Weeren, Herman O. & Lee, John (W. John)
System:
The UNT Digital Library
Testing of Adsorptive Capacity of Charcoal Beds : HRT Test No II-A 10 b
During the pre-startup phase of the HRT operations, moisture was accidentally introduced into the charcoal bed adsorbers in the off-gas system. Tests have been made to determine the effect of wetting upon the adsorptive properties of the charcoal. The work was divided into two phases, testing of fresh charcoal in the laboratory and testing of the HRT charcoal beds in situ. It is recommended that the beds be dried by heating them to about 40 C and purging each with one to two liters/min of dry instrument air.
Date:
June 4, 1957
Creator:
Van Winkle, R. & Wiethaup, R.R.
System:
The UNT Digital Library