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Technical Report Archive and Image Library
380
National Advisory Committee for Aeronautics Collection
318
Office of Scientific & Technical Information Technical Reports
77
TRAIL Microcard Collection
36
Boy and Girl Scout Annual Reports
9
Harris and Eliza Kempner
3
Abilene Library Consortium
2
Texas State Publications
2
National WASP WWII Museum
2
World War Two Collection
2
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NACA Wartime Reports
96
NACA Technical Notes
90
NACA Research Memorandums
67
NACA Advanced Restricted Reports
44
NACA Technical Memorandums
35
Atomic Energy Commission Reports
33
NACA Technical Reports
26
NACA Memorandum Reports
22
NACA Advanced Confidential Reports
21
United States Bureau of Mines Reports
13
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473 Matching Results
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The Surface Preparation of Uranium for X-Ray Diffraction Studies by the Spectrometer Technique
A report which describes a number of experiments conducted to compare the effects of different methods of surface preparation on x-ray diffraction patterns of uranium obtained by the spectrometer technique.
Date:
March 24, 1949
Creator:
Bach, J. H. & Burnham, J. B.
System:
The UNT Digital Library
A flight investigation to increase the safety of a light airplane
Report presenting information about a series of modifications incorporated into light airplanes to increase safety, including decreasing the wing incidence, increasing the wing washout, increasing the area and aspect ratio of the horizontal and vertical tails, moving the elevators out of propeller slipstreams, depressing the thrust axis, and limiting the rudder travel. The new inherent safety characteristics and effects on the airplane's performance are provided.
Date:
March 1947
Creator:
Hunter, P. A. & Vensel, J. R.
System:
The UNT Digital Library
Compressive Buckling of Simply Supported Plates With Longitudinal Stiffeners
"Charts are presented for the analysis of the stability under compression of simply supported rectangular plates with one, two, three, and an infinite number of identical equally spaced longitudinal stiffeners that have zero torsional stiffness" (p. 1).
Date:
March 1949
Creator:
Seide, Paul & Stein, Manuel
System:
The UNT Digital Library
Linear theory of boundary effects in open wind tunnels with finite jet lengths
Report in two parts: one examines the boundary conditions for an open wind tunnel with special references to the effects of the closed entrance and exit sections, while the other derives solutions of four types of two-dimensional open tunnels, including one in which the pressures on the two free surfaces are not equal.
Date:
March 1949
Creator:
Katzoff, Samuel; Gardner, Clifford S.; Diesendruck, Leo & Eisenstadt, Bertram J.
System:
The UNT Digital Library
Matrix Methods for Calculating Cantilever-Beam Deflections
Note presenting the method of numerical integration for calculation of beam deflection in matrix form to give it the advantages which are inherent in an influence-coefficient method. Examples are presented to show that the use of weighted matrices reduces the calculation time required to obtain a desired degree of accuracy.
Date:
March 1949
Creator:
Benscoter, Stanley U. & Gossard, Myron L.
System:
The UNT Digital Library
Data on Optimum Length, Shear Strength, and Tensile Strength of Age-Hardened 17S-T Machine-Countersunk Rivets in 75S-T Sheet
Report presenting a series of tensile-strength and shear-strength tests made on age-hardened 17S-T rivets machine-countersunk in 75S-T sheets. The results of the tests indicated that the joints can be made satisfactorily with regard to both flushness and strength if the ratio of buck to diameter is kept to a certain value.
Date:
March 1947
Creator:
Schuette, Evan H. & Niles, Donald E.
System:
The UNT Digital Library
The streamline pattern in the vicinity of an oblique airfoil
"A method for determining the streamwise flow pattern of a nonviscous incompressible fluid about an oblique airfoil from the corresponding flow pattern about the airfoil in normal position is presented and illustrated in two examples. The method can be extended to account approximately for compressibility effects by applying the Prandtl-Glauert correction factor to the flow pattern that is normal to the leading edge of the airfoil. The method is expected to be useful in determining the shape of a fuselage or nacelle having a minimum of interference with the flow over a swept-back wing" (p. 1).
Date:
March 1947
Creator:
Watkins, Charles E.
System:
The UNT Digital Library
Effect of forebody warp on the hydrodynamic qualities of a hypothetical flying boat having a hull length-beam ratio of 15
Report of an investigation of the effect of forebody warp on the hydrodynamic qualities of a hypothetical flying boat with a hull length-beam ratio of 15 in smooth water and in waves. Warping the forebody planing bottom was found to appreciably increase the range of stable trim between the lower and upper trim limits of stability, although the center-of-gravity limits of stability were reduced.
Date:
March 1949
Creator:
Carter, Arthur W. & Weinstein, Irving
System:
The UNT Digital Library
Data on the Compressive Strength of 75S-T6 Aluminum-Alloy Flat Panels with Longitudinal Extruded Z-Section Stiffeners
"The experimental results are presented for a 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 concerned with panels in which the ratio of the thickness of the stiffener material to the skin material varies from 0.4 to 1.0 and the ratio of stiffener spacing to skin thickness varies from 15 to 40" (p. 1).
Date:
March 1949
Creator:
Hickman, William A. & Dow, Norris F.
System:
The UNT Digital Library
Experimental Investigation of the Stress Distribution Around Reinforced Circular Cut-Outs in Skin Stringer Panels Under Axial Loads
Note presenting results of strain surveys around four reinforced circular cut-outs successively made in an axially loaded skin-stringer tension panel. Curves are presented which show the distribution of stringer and shear stresses in the panel and bending stresses in the reinforcing rings.
Date:
March 1947
Creator:
Farb, Daniel
System:
The UNT Digital Library
Frequency-Response Method for Determination of Dynamic Stability Characteristics of Airplanes With Automatic Controls
Note presenting a frequency-response method for determining the critical control-gearing and hunting oscillations of airplanes with automatic pilots. The method is graphical and has several advantages over the standard numerical procedure based on Routh's discriminant. Several examples are worked out to illustrate the application of the frequency-response method in determining the effect of automatic-pilot lag or lead on critical control gearing and in determining the amplitude and frequency of hunting.
Date:
March 1947
Creator:
Greenberg, Harry
System:
The UNT Digital Library
Effect of Automatic Stabilization on the Lateral Oscillatory Stability of a Hypothetical Airplane at Supersonic Speeds
Note presenting an investigation to determine the effect of automatic stabilization on the lateral oscillatory stability of a hypothetical supersonic airplane. The investigation included an autopilot sensitive to either the yawing or rolling angular velocity. The results of the investigation indicated that all the automatic pilots improved the stability of the original unstable short-period oscillation.
Date:
March 1949
Creator:
Sternfield, Leonard
System:
The UNT Digital Library
Notes on the Foundations of the Theory of Small Displacements of Orthotropic Shells
Note presenting a survey that has been made of the various systems of equations which have been given in the literature for the analysis of small deflections of thin elastic shell. A new system of equations has been derived for the analysis of shells, which includes the effects of transverse shear and normal stresses.
Date:
March 1949
Creator:
Hildebrand, F. B.; Reissner, E. & Thomas, G. B.
System:
The UNT Digital Library
Flutter of a uniform wing with an arbitrarily placed mass according to a differential-equation analysis and a comparison with experiment
Report presenting a method for the calculation of flutter speed of a uniform wing carrying an arbitrarily placed concentrated mass. The method involves the solution of the differential equations of motion of the wing at flutter speed and does not require the assumption of specific normal modes of vibration.
Date:
March 1949
Creator:
Runyan, Harry L. & Watkins, Charles E.
System:
The UNT Digital Library
The influence of blade-width distribution on propeller characteristics
Report presenting combined force and wake survey tests on three-blade model propellers in order to determine the effects of blade-width distribution on constant-speed efficiency characteristics. The most important result is the demonstration that blade-width distribution has a marked influence on the constant-speed efficiency characteristics of propellers.
Date:
March 1949
Creator:
Reid, Elliott G.
System:
The UNT Digital Library
Preliminary Analysis of NACA Measurements of Atmospheric Turbulence Within a Thunderstorm - U.S. Weather Bureau Thunderstorm Project
"A general description of the field operations of the U.S. Weather Bureau thunderstorm project conducted in the vicinity of Orlando, Florida during the summer month of 1946 is given. The participation of NACA in this project is described and measurements of atmospheric turbulence taken by NACA are presented for one of the flights. The results indicate that some regions of thunderstorms may present no great hazard to flight, while exceptionally severe conditions of atmospheric turbulence may occur in other regions, or even in the same region, at about the same time" (p. 1).
Date:
March 1947
Creator:
Tolefson, Harold B.
System:
The UNT Digital Library
Investigation at low speeds of the effect of aspect ratio and sweep on rolling stability derivatives of untapered wings
Report presenting a wind-tunnel investigation conducted in rolling flow to determine the effects of aspect ratio and sweep on the rolling stability derivatives for a series of untapered wings. The results indicated that when the aspect ratio is held constant, an increase in sweepback angle causes a significant reduction in the damping in roll at low lift coefficients for only the higher aspect ratios tested.
Date:
March 1949
Creator:
Goodman, Alex & Fisher, Lewis R.
System:
The UNT Digital Library
Strength analysis of stiffened thick beam webs
Report presenting a method for the strength analysis of stiffened beam webs as applied to beams with ratios of applied shear to buckling shear less than 2.5. Results regarding critical shear stress, forced crippling failure in uprights, and web failures are provided.
Date:
March 1949
Creator:
Levin, L. Ross & Sandlin, Charles W., Jr.
System:
The UNT Digital Library
Ambient Pressure Determination at High Altitudes by Use of Free-Molecule Theory
"Several methods (references 1 and 2) based on gas-dynamic principles are available for reducing such measurements. The results obtained by these methods are subject to the limitation of the gas-dynamic theory which is that the mean free path of the molecules between impacts, is small with respect to the measuring device. Inasmuch as no information on the subject is to present known to be available, the purpose of the present paper is to present a method based on the concept of free-molecule theory for use in connection with this problem" (p. 1).
Date:
March 1949
Creator:
Wiener, Bernard
System:
The UNT Digital Library
Dynamometer-stand investigation of a group of mufflers
Report presenting an experimental investigation of a series of exhaust mufflers installed on a typical six-cylinder light-airplane engine mounted on a ground dynamometer sound. Several conclusions regarding muffler design are drawn from this testing. Since engine and propeller noise are about equal for this power-plant installation, both engine-exhaust and propeller noises must be reduced to obtain a sizable reduction in overall sound-pressure level.
Date:
March 1949
Creator:
Davis, Don D., Jr. & Czarnecki, K. R.
System:
The UNT Digital Library
Radioactive contamination in the environs of the Hanford Works for the period July, August, September 1948
This report summarizes the radioactive contamination measured at the Hanford Works and vicinity for the quarter July, August, and September 1948. Topics discussed are: meteorology; airborne contamination and contamination of the Columbia River; vegetation; drinking water; and in Hanford Wastes.
Date:
March 10, 1949
Creator:
Singlevich, W.
System:
The UNT Digital Library
Determination of possibility of film removal by increased water flow
None
Date:
March 29, 1945
Creator:
unknown
System:
The UNT Digital Library
Review of stuck slugs
Records show that difficulty has been encountered with the discharge of two tubes in B Pile, twelve in the D Pile, and fifteen in the F Pile during the period from initial start-up until March 15, 1948. In sixteen cases the tubes have been replaced, six of the tubes which were in the fringe have been made air tubes, four did not warrant replacement, and three are to be replaced in the future. General statistics for these twenty-nine tubes are presented with additional details in this report.
Date:
March 15, 1948
Creator:
Alexander, W. K. & Woods, W. K.
System:
The UNT Digital Library
[Hanford 100 Area Technical Department monthly activity report], February 1945
This document details the activities of the Hanford 100 Area for the month of February 1945.
Date:
March 2, 1945
Creator:
Worthington, H.
System:
The UNT Digital Library