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6,736 Matching Results
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Surface area coefficients for airship envelopes
"In naval architecture, it is customary to determine the wetted surface of a ship by means of some formula which involves the principal dimensions of the design and suitable constants. These formulas of naval architecture may be extended and applied to the calculation of the surface area of airship envelopes by the use of new values of the constants determined for this purpose. Surface area coefficients were calculated from the actual dimensions, surfaces, and volumes of 52 streamline bodies, which form a series covering the entire range of shapes used in the present aeronautical practice" (p. 1).
Date:
February 1922
Creator:
Diehl, W. S.
System:
The UNT Digital Library
Speed Measurements Made by Division "A" of the Airplane Directorate (Flugzeugmeisterei), Subdivision for Flight Experiments
"The various speeds of an airplane can only be measured in horizontal flight, since there are no means for measuring the angle of ascent or descent. The measurements must be corrected for the density of the air. This is obtained by simultaneous pressure and temperature measurements during flight" (p. 1).
Date:
July 1923
Creator:
Heidelberg, V. & Hölzel, A.
System:
The UNT Digital Library
Preliminary Study of the Damping Factor in Roll
This paper constitutes a general theoretical discussion of the damping factor in roll, together with the results of wind tunnel tests on the continuous rolling of U.S.A. 30 airfoil.
Date:
October 1923
Creator:
Shoemaker, James M. & Lee, John G.
System:
The UNT Digital Library
The experimental determination of the moments of inertia of airplanes
The application of the pendulum method to the experimental determination of the moments of inertia of airplanes is discussed in this report. Particular reference is made to the effects of the air, in which the airplane is immersed, on the swinging tests and to the procedure by which these effects are taken into account. This procedure has been used for some time, and the data on several airplanes for which the moments of inertia have been found are included.
Date:
June 8, 1933
Creator:
Soulé, Hartley A. & Miller, Marvel P.
System:
The UNT Digital Library
General Theory of Aerodynamic Instability and the Mechanism of Flutter
"The aerodynamic forces on an oscillating airfoil or airfoil-aileron combination of three independent degrees of freedom were determined. The problem resolves itself into the solution of certain definite integrals, which were identified as Bessel functions of the first and second kind, and of zero and first order. The theory, based on potential flow and the Kutta condition, is fundamentally equivalent to the conventional wing section theory relating to the steady case" (p. 291).
Date:
May 2, 1934
Creator:
Theodorsen, Theodore
System:
The UNT Digital Library
Phosphate Rock Near Maxville, Philipsburg, and Avon, Montana
From abstract: This paper gives the results of a resurvey of certain areas in Montana to which renewed interest has been directed by the development recently of a market for crude phosphate rock in British Columbia, nearby.
Date:
1936
Creator:
Pardee, J. T.
System:
The UNT Digital Library
Spinning characteristics of wings 4: changes in stagger of rectangular Clark Y cellules
Report presenting testing of rectangular Clark-Y biplane cellules with zero and -0.25 stagger, the gap equal to the chord, and 0 degrees decalage were tested on the NACA spinning balance in the 5-foot vertical tunnel.
Date:
December 1937
Creator:
Bamber, M. J. & House, R. O.
System:
The UNT Digital Library
Spinning characteristics of wings 5: N.A.C.A. 0009, 23018, and 6718 monoplane wings
Three rectangular monoplane wings having rounded tips were tested on the N.A.C.A. spinning balance in the 5-foot vertical wind tunnel. The airfoil sections used were the N.A.C.A. 0009, 23018, and 6718. The aerodynamic characteristics of the models and a prediction of the angles of sideslip for steady spins are given. There is included an estimate of the yawing moment that must be furnished by parts of the airplane to balance the inertia couples and wing yawing moments for spinning equilibrium. The predicted angles of sideslip and yawing moments required for spinning equilibrium for a Clark Y wing with the same form are included for comparison.
Date:
January 1938
Creator:
Bamber, M. J. & House, R. O.
System:
The UNT Digital Library
Wind-Tunnel Investigation of Air Inlet and Outlet Openings for Aircraft, Special Report
"An investigation was made in the NACA 5-foot vertical wind tunnel of a large variety of duct inlets and outlets to obtain information relative to their design for the cooling or the ventilation systems on aircraft. Most of the tests were of openings in a flat plate but, in order to determine the best locations and the effects of interference, a few tests were made of openings in an airfoil. The best inlet location for a system not including a blower was found to be at the forward stagnation point; for one including a blower, the best location was found to be in the region of lowest total head, probably in the boundary layer near the trailing edge" (p. 1).
Date:
October 1938
Creator:
Rogallo, Francis M. & Gauvain, William E.
System:
The UNT Digital Library
Internal-Flow Systems for Aircraft
An investigation has been made to determine efficient arrangements for an internal-flow system of an aircraft when such a system operates by itself or in combination with other flow systems. The investigation included a theoretical treatment of the problem and tests in the NACA 5-foot vertical wind tunnel of inlet and outlet openings in a flat plate and in a wing.
Date:
1941
Creator:
Rogallo, F. M.
System:
The UNT Digital Library
Wind tunnel investigation of control surface characteristics 9: some analytical considerations and experimental test results for an internally balanced flap
Report presenting an analysis of the probable aerodynamic section characteristics of a plain flap with various arrangements of internal balance. The results of the calculations previously obtained were found to be in agreement with the experiment. Some possible applications of the data to balancing tabs are also provided.
Date:
July 1942
Creator:
Sears, Richard I.
System:
The UNT Digital Library
Investigation of Effects of Various Camouflage Paints and Painting Procedures on the Drag Characteristics of an NACA 65(Sub 421)-420, a = 1.0 Airfoil Section
Bulletin presenting an investigation of the effects of various camouflage paints and painting procedures on the drag characteristics of a 60-inch-chord low-drag airfoil in the NACA two-dimensional low-turbulence pressure tunnel.
Date:
July 1944
Creator:
Braslow, Albert L.
System:
The UNT Digital Library
Hanford Site annual dangerous waste report: Volume 3, Part 2, Waste Management Facility report, dangerous waste
This report contains information on hazardous wastes at the Hanford Site. Information consists of shipment date, physical state, chemical nature, waste description, handling and containment vessel, waste number, waste designation and amount of waste.
Date:
December 31, 1944
Creator:
unknown
System:
The UNT Digital Library
Recovery of Alumina From Kaolin by the Lime-Soda Sinter Process
Report issued by the U.S. Bureau of Mines on exploration of kaolin clay deposits for alumina. Properties of the kaolin clay and alumina recovered are listed. This report includes tables, graphs, and illustrations.
Date:
May 1947
Creator:
Cservenyak, Frank J.
System:
The UNT Digital Library
Geology of the southern Guadalupe Mountains, Texas
From Abstract: "This report deals with an area of 425 square miles in the western part of Texas, immediately south of the New Mexico line. The report describes the geology of the area, that is, the nature of its rocks, tectonics, and surface features, and the evidence that they give as to the evolution of the area through geologic time. Incidental reference is made to the geology of surrounding regions in order to place the area in its environment."
Date:
1948
Creator:
King, Philip B.
System:
The UNT Digital Library
Sideslip Angles and Vertical-Tail Loads Developed by Periodic Control Deflections
Note presenting a consideration of dynamic maneuvers consisting of periodic rudder and aileron control deflections with respect to the maximum sideslip angles developed and the position of the rudder at the time of maximum sideslip. A method is also given for computing the maximum sideslip angles when the forces and moments are nonlinear functions of the sideslip.
Date:
January 1948
Creator:
Lomax, Harvard
System:
The UNT Digital Library
Determination of stresses in gas-turbine disks subjected to plastic flow and creep
Report presenting an extension of a finite-difference method to include the computation of disk stresses when plastic flow and creep are considered. The results of numerical examples indicate qualitatively that plastic flow markedly alters the elastic-stress distribution and that, if the amount of creep is small, the effect on stress distribution is also small.
Date:
June 1948
Creator:
Millenson, M. B. & Manson, S. S.
System:
The UNT Digital Library
Effect of tunnel configuration and testing technique on cascade performance
"An investigation has been conducted to determine the influence of aspect ratio, boundary-layer control by means of slots and porous surfaces, Reynolds number, and tunnel end-wall condition upon the performance of airfoils in cascades. A representative compressor-blade section (the NACA 65-(12)(10) of aspect ratios of 1, 2, and 4 has been tested at low speeds in cascades with solid and with porous side walls. Two-dimensional flow was established in porous-wall cascades of each of the three aspect ratios tested; the flow was not two-dimensional in any of the solid-wall cascades" (p. 263).
Date:
November 30, 1949
Creator:
Erwin, John R. & Emery, James C.
System:
The UNT Digital Library
Magnesite Deposits of Central Ceará, Brazil
From introduction: The purpose of this study was to investigate the quantity and quality of [Central Ceara, Brazil] magnesite, and the writer concludes that this group of deposits constitutes one of the major reserves of high-grade magnesite in the Western Hemisphere. The ore could be used in the production of any commercial grade of magnesia with little or no beneficiation. Soil and alluvial overburden is thin between widespread outcrops, so all the deposits could be mined from open pits.
Date:
1950
Creator:
Bodenlos, Alfred J.
System:
The UNT Digital Library
Mines and Mineral Deposits (Except Fuels) Meagher County, Montana
Report issued by the U.S. Bureau of Mines discussing the mining procedures and minerals of Meagher County, Montana. History, geology, and mineral production of the Meagher County mines are presented. This report includes tables, and maps.
Date:
January 1950
Creator:
Roby, Robert N.
System:
The UNT Digital Library
Initial flight investigation of a twin engine supersonic ram jet
From Summary: "A flight investigation was made of a supersonic twin-ram-jet test vehicle using short-flame-length burners. The test demonstrated a maximum acceleration of 3.6g and a maximum flight Mach number of 3.02. Data were obtained over a Mach number range from about 1.9 to 3.0, an altitude range from 1,800 to 40,900 feet, and a fuel-air-ratio range from 0.012 to 0.065."
Date:
September 15, 1950
Creator:
Faget, Maxime A. & Dettwyler, H. Rudolph
System:
The UNT Digital Library
University of Chicago Spectroscopic Laboratory Annual Report: April 1, 1950 - March 31, 1951, Part 1
Report containing articles, manuscripts, and tabulations of recorded spectra created by the Spectroscopic Laboratory of the University of Chicago.
Date:
1951-03~
Creator:
University of Chicago. Laboratory of Molecular Structure and Spectra.
System:
The UNT Digital Library
General plastic behavior and approximate solutions of rotating disk in strain-hardening range
Report presenting a partly linearized solution of plastic deformation of a rotating disk based on the deformation theory of plasticity and considering finite strains. The method can be used to investigate the general plastic behavior of a rotating disk.
Date:
May 1951
Creator:
Wu, M. H. Lee
System:
The UNT Digital Library
C-431 B -- Scope document
This document describes the scope of the C-431-B Reactor Production Facility. In dealing with the broad phases of the project, it includes the Sections ``A`` (Scope Modifications) of the approved Design Criteria, modified to ensure correctness to date. Location of the facility has been set as shown on the site map in HDC-2101, designated site number one. Included in Project C-431-B are the 105-C Building, including within that building facilities previously located in the 1608 Building, a contaminated effluent crib adjacent to 105-C, and gas facilities using the 115-B Building interconnected with 105-C. Also included are an oil shed, a thimble storage cave, a badge house, and an exclusion fence. Building services and process lines will be considered part of the project to a location nominally five feet outside of 105-C.
Date:
June 1, 1951
Creator:
Hollister, H. L.
System:
The UNT Digital Library