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Preliminary Investigation of the Loads Carried by Individual Bolts in Bolted Joints

Description: Report presenting a general solution for the determination of loads carried by individual bolts in symmetrical butt joints. Testing was conducted on test specimens made of 24S-T aluminum-alloy plates fastened by two or three 1/4-inch alloy-steel bolts with the bolts in a single line in line with the applied load. Results regarding the determination of bolt loads and deflections from test data, curves of joint load against bolt load, and curves of bolt load against deflection are provided.
Date: May 1946
Creator: Tate, Manford B. & Rosenfeld, Samuel J.
open access

Preliminary Investigation of the Relation of the Compressive Strength of Sheet-Stiffener Panels to the Diameter of Rivet Used for Attaching Stiffeners to Sheet

Description: Report discusses the results of compressive testing of 24S-T aluminum-alloy sheet-stiffener panels with five ratios of stiffener thickness to sheet thickness. For each ratio, rivets of five different diameters were used to attach the stiffeners to the sheets. The compressive strengths were found to increase with an increase in the diameter of the rivets until the ratio of rivet diameter to over-all thickness reached a certain point.
Date: November 1944
Creator: Dow, Norris F. & Hickman, William A.
open access

A Preliminary Investigation of the Usefulness of Camber in Obtaining Favorable Airfoil-Section Drag Characteristics at Supercritical Speeds

Description: Report presenting an investigation to determine the possibility of delaying at moderate or large lift coefficients the onset of the abrupt supercritical drag rise of an airfoil section by the use of camber. Results indicated that the addition of camber to the NACA 0010 airfoil leads to significant improvements in the drag characteristics at moderately supercritical speeds .
Date: October 7, 1949
Creator: Nitzberg, Gerald E.; Crandall, Stewart M. & Polentz, Perry P.
open access

Preliminary Investigation of Two Full-Scale Propellers to Determine the Effect of Swept-Back Blade Tips on Propeller Aerodynamic Characteristics

Description: Report presenting an investigation of two 10-foot-diameter three-blade propellers to determine the effect of swept-back blade tips on propeller aerodynamic characteristics. Results regarding the effect of swept-back tips on maximum efficiency and constant-power propeller operation are provided.
Date: May 12, 1947
Creator: Evans, Albert J. & Klunker, E. Bernard
open access

Preliminary Investigation of Various Ailerons on a 42 Degree Sweptback Wing for Lateral Control at Transonic Speeds

Description: Report presenting an investigation at transonic speeds in the high speed tunnel to determine the rolling-effectiveness characteristics of several aileron arrangements for use on a 42 degree sweptback wing. Results regarding the rolling-moment coefficients, variation of coefficient with Mach number, outboard cusp aileron, and use of the leading-edge flaps are provided.
Date: September 7, 1948
Creator: Turner, Thomas R.; Lockwood, Vernard E. & Vogler, Raymond D.
open access

Preliminary Investigation to Determine Propeller Section Characteristics by Measuring the Pressure Distribution on an NACA 10-(3)(08)-03 Propeller Under Operating Conditions

Description: "An investigation has been made in the Langley 16-foot high-speed tunnel to determine the propeller-section characteristics by measuring the pressure distribution on the airfoil sections of a rotating propeller. The pressures were measured at nine radial stations on an NACA 10-(3)(08)-03 design two-blade propeller. This paper presents the results of the pressure measurements in the form of normal-force and moment coefficients and covers a range of nominal angle of attack (simple blade element t… more
Date: July 14, 1948
Creator: Evans, Albert J. & Liner, George
open access

Preliminary Measurements of the Dynamic Lateral Stability Characteristics of the Douglas D-588-II (BuAero No. 37974) Airplane

Description: "This paper presents some data on the dynamic lateral stability characteristics of the Douglas D-558-II (BuAero No. 37974) airplane. For the airplane in the clean condition, the lateral oscillations are lightly damped. In the landing condition, the airplane performs a constant-amplitude lateral oscillation" (p. 1).
Date: August 18, 1949
Creator: Sjoberg, Sigurd A.
open access

A Preliminary Outline of Desirable Research in the Geochemistry of Uranium

Description: Report outlining fields of study for a program of research in the geochemistry of uranium. From Abstract: "Various specific topics and projects that apply to these fields of study are suggested."
Date: April 1949
Creator: Rabbitt, J. C.; Rubey, W. W.; Butler, A. P., Jr.; Lovering, T. S. & McKelvey, V. E.
open access

Preliminary Report on a Colorimetric Method for the Determination of Microgram Quantities of Thorium : Experiments in the Dissolution of O2 Metal [UO2]

Description: Abstract. thorium can be precipitated as a salt of p-dimethylaminoazophenylarsonic acid at a pH of about 1.5. the precipitate, collected on a sintered glass filter is washed with dilute ammonium hydroxide to dissolve the dye. the amount of thorium is determined by measuring the concentration of the dye spectrophotometrically at a wavelength of 450 millimicrons. Zirconium, which interferes, can be separated and determined using the same reagent in strong hydrochloric. the behavior of thorium… more
Date: January 1, 1945
Creator: Byerly, W.; Niedrach, L.; Davin, W.; Dyas, H. & Bane, R. W.
open access

Preliminary Report on Existing Active Particle Hazard-200 Areas

Description: "Recent surveys by the Health Instrument Section have disclosed the presence of many small radioactive spots on ground surfaces in the T and B plant areas. Investigation has shown that representative samples of the spots when mechanically separated invariably end in a single radioactive particle."
Date: October 22, 1947
Creator: Mickelson, M. L.
open access

Preliminary Report on Field Measurement of Radioactivity

Description: The following report covers the process of field measurement of radioactivity with a limited screening process of activity equivalent to 0.005 percent of uranium in equilibrium with its disintegration products.
Date: May 1945
Creator: Stead, Frank W.
open access

Preliminary Report on Flight Tests of an Airplane Having Exhaust-Heated Wings

Description: Report presenting testing of an airplane in icing conditions to determine the effect of exhaust heat applied to the wings as a means of preventing ice formations. Other ice-prevention equipment, including an exhaust gas-heated pitot-static head, hot-air-heated windshield, and an inflatable de-icer were also tested.
Date: April 1941
Creator: Rodert, Lewis A.; McAvoy, William H. & Clousing, Lawrence A.
open access

Preliminary Report on Methods of Analysis for Very Small Percentages of Uranium 0002

Description: Abstract: Procedures are presented in detail of two methods for the determination of very small percentages of uranium (down to 0.002%). The methods are applicable to a wide variety of materials. Notes on the methods and confirmatory experiments are also given.
Date: July 1945
Creator: Foster, M. D.; Grimaldi, F. S. & Stevens, R. E.
open access

Preliminary Report on Radioactivity of Some North Carolina Pegmatites

Description: The following report is based on the findings of a Geological Survey party who spent one week during July 1944 in western North Carolina testing some of the Pegmatites and one Kyanite mine of that region for radioactive minerals.
Date: August 1944
Creator: Slaughter, A. L. & Clabaugh, S. E.
open access

Preliminary Report on the Fundamentals of the Control of Turbine-Propeller Jet Power Plant

Description: "On the basis of the investigations so far completed on the behavior of PTL power plants under various operating conditions, in which the influence of the propeller characteristics is of considerable importance, the most important aspects of a control system for turbine-propeller jet power plants are deduced. A simple possible means for its concrete realization, which is also applicable to TL [NACA comment: TL, jet] power plants, is presented by means of examples. A control device of this kind … more
Date: July 1947
Creator: Kühl, H.
open access

Preliminary Report : Placer Deposits of Monazite

Description: The following report provides information and results of an investigation on heavy mineral concentrates available in the placer deposits of North Carolina during the summer of 1946.
Date: September 1946
Creator: Brill, K. G., Jr. & Carroll, G. V.
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