UNT Libraries Government Documents Department - 183 Matching Results

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Cooperative Measurements of Radio Fading in 1925

Description: Scientific paper issued by the Bureau of Standards over studies conducted on radio fading. As stated in the abstract, "the series of measurements on fading were devoted to studies of fading effects during the sunset period, effects during the solar eclipse of January 24, the fading variations throughout a 24-hour day, and the effects of high transmitting power on fading" (p. 419). This paper includes tables, maps, illustrations, and photographs.
Date: August 17, 1927
Creator: Dellinger, J. H.; Jolliffe, C. B. & Parkinson, T.
Item Type: Refine your search to only Report
open access

The Corrosion of Magnesium and of the Magnesium Aluminum Alloys Containing Manganese

Description: "The extensive use of magnesium and its alloys in aircraft has been seriously handicapped by the uncertainties surrounding their resistance to corrosion. This problem has been given intense study by the American Magnesium Corporation and at the request of the Subcommittee on Materials for Aircraft of the National Advisory Committee for Aeronautics this report was prepared on the corrosion of magnesium" (p. 419).
Date: 1927
Creator: Boyer, J. A.
Item Type: Refine your search to only Report
open access

Description of the NACA Universal Test Engine and Some Test Results

Description: "This report describes the 5-inch bore by 7-inch stroke single cylinder test engine used at the Langley Field Laboratory of the National Advisory Committee for Aeronautics in laboratory research on internal-combustion engine problems and presents some results of tests made therewith. The engine is arranged for variation over wide ranges, of the compression ratio and lift and timing of both inlet and exhaust valves while the engine is in operation. Provision is also made for the connection of a … more
Date: 1927
Creator: Ware, Marsden
Item Type: Refine your search to only Report
open access

Determining the Velocity Distribution in the Boundary Layer of an Airfoil Fitted With a Rotary Cylinder

Description: In the closer investigation of the results obtained from a wing model with a rotary cylinder mounted in its leading edge (NACA TM's 307 and 354), the velocity distribution in the vicinity of the surface of the model was determined by a hot-wire anemometer. The results confirmed the belief that the rotary cylinder had considerable effect on the air flow, but demonstrated the fact that the direct influence of the cylinder is confined to a very thin layer in immediate proximity to the surface.
Date: May 1927
Creator: Van der Hegge Zijnen, B. G.
Item Type: Refine your search to only Report
open access

Development, Mining, and Handling of Ore in Folded and Faulted Areas, Red Iron Mines, Birmingham District, Alabama

Description: Technical paper issued by the Bureau of Mines over mining of red iron ores in Birmingham, Alabama. As stated in the introduction, "the present paper deals more specifically with the development and handling of ore as affected by folds and faults in the ore bed, and considers changes that may be desirable or necessary in future mining practices" (p. 2). This paper includes illustrations, and photographs.
Date: 1927
Creator: Crane, W. R.
Item Type: Refine your search to only Report
open access

The Direct Measurement of Engine Power on an Airplane in Flight With a Hub Type Dynamometer

Description: "This report describes tests made to obtain direct measurements of engine power in flight. Tests were made with a Bendemann hub dynamometer installed on a modified DH-4 Airplane, Liberty 12 Engine, to determine the suitability of this apparatus. This dynamometer unit, which was designed specially for use with a liberty 12 engine, is a special propeller hub in which is incorporated a system of pistons and cylinders interposed between the propeller and the engine crankshaft. The torque and thrust… more
Date: 1927
Creator: Gove, W. D. & Green, M. W.
Item Type: Refine your search to only Report
open access

Discussion of the results of the boundary-layer tests of an airfoil fitted with a rotary cylinder

Description: The results of the velocity measurements in the boundary layer described in NACA-TM 411 are here discussed in greater detail. The measurements made were of the velocity distribution in the vicinity of an airfoil model fitted with a rotary cylinder and were undertaken for the purpose of obtaining a closer insight into the phenomena observed in experimenting with this model.
Date: August 1927
Creator: Wolff, E. B. & Koning, C.
Item Type: Refine your search to only Report
open access

The Distribution of Loads Between the Wings of a Biplane Having Decalage

Description: "It is known that in a biplane the load is not distributed equally between the wings. The presence of one wing will affect the lift characteristics of the other wings. A designer must know the total load that each wing carries in order that he may design an adequate structure. The purpose here is to determine the distribution of loads between the wings of a biplane at various angles of decalage, when the gap/chord ratio is one, and there is no stagger" (p. 1).
Date: November 1927
Creator: Mock, Richard M.
Item Type: Refine your search to only Report
open access

Distribution of Pressure Over Model of the Upper Wing and Aileron of a Fokker D-VII Airplane

Description: "This report describes tests made for the purpose of determining the distribution of pressure over a model of the tapered portion of the upper wing and the aileron of a Fokker D-VII Airplane. Normal pressures were measured simultaneously at 74 points distributed over the wing and aileron. Tests were made throughout the useful range of angles of attack with aileron setting ranging from -20 degrees to +20 degrees. The results are presented graphically" (p. 541).
Date: 1927
Creator: Fairbanks, A. J.
Item Type: Refine your search to only Report
open access

Drag measurements of two thin wing sections at different index values

Description: It is stated that the index value 6000, as found in normal tests of wing sections with a 20 cm chord, falls in the same region where the transition of laminar to turbulent flow takes place on thin flat plates. It is to be expected that slightly cambered, thin wing sections will behave similarly. The following test of two such wing sections were made for the purpose of verifying this supposition.
Date: June 1927
Creator: Ackeret, J.
Item Type: Refine your search to only Report
open access

Drag Measurements on a Junkers Wing Section: Application of the Betz Method to the Results of Comparative Tests Made on a Model and on an Airplane in Flight

Description: The comparison of model tests in flight can be based on the result of such measurements. They are very important from the aerodynamical point of view, as they lead to useful conclusions regarding the behavior of the wing, its best shape and the conformity of theoretical and actual flow. Although there still remains a certain prejudice against such measurements, I have still attempted to make these comparative tests in order to inspire confidence in their reliability.
Date: September 1927
Creator: Weidinger, Hanns
Item Type: Refine your search to only Report
open access

Drag of Wings With End Plates

Description: "In this report a formula for calculating the induced drag of multiplanes with end plates is derived. The frictional drag of the end plates are used, is sufficiently large to increase the efficiency of the wing. Curves showing the reduction of drag for monoplanes and biplanes are constructed; the influence of gap-chord ratio, aspect ratio, and height of end plate are determined for typical cases. The method of obtaining the reduction of drag for a multiplane is described" (p. 253).
Date: January 20, 1927
Creator: Hemke, Paul E.
Item Type: Refine your search to only Report
open access

Drilling and Blasting in Open-Cut Copper Mines

Description: From Introduction: "The drilling and blasting practices described in this bulletin are chiefly those in use at the time of these visits. Information, obtained by correspondence, on recent changes at certain mines is also included. The bulletin is confined to descriptions and comparisons of drilling and blasting methods at the six open-cut mines."
Date: 1927
Creator: Gardner, E. D.
Item Type: Refine your search to only Report
open access

Duralumin and Its Corrosion

Description: The types of corrosion and factors of corrosion of duralumin are investigated. Salt water is the most common of the corroding media with which designers have to contend in using duralumin in aircraft and ships.
Date: April 1927
Creator: Nelson, Wm.
Item Type: Refine your search to only Report
open access

Duralumin - Defects and Failures

Description: It is proposed in this paper to identify some of the defects and failures in duralumin most frequently encountered by the aircraft industry with a view to indicate their importance. The defects and failures in duralumin may be classified into the following groups: 1) defects produced during manufacture; 2) defects produced during fabrication; 3) corrosion and erosion; and 4) fatigue failures. Only the first two will be covered in this report.
Date: December 1927
Creator: Nelson, Wm.
Item Type: Refine your search to only Report
open access

Duralumin Welding

Description: Gas and electric welding of duralumin are discussed. Some of the elements that go into determining a successful weld and inspecting for faults are also described.
Date: February 1927
Creator: Nelson, Wm.
Item Type: Refine your search to only Report
open access

The effect of flight path inclination on airplane velocity

Description: This report was prepared at the request of the National Advisory Committee for Aeronautics in order to supply a systematic study of the relations between the flight velocity V and its horizontal component V subscript H, in power glides. Curves of V and V subscript H plotted against the inclination of the flight path 0 are given, together with curves which show the maximum values of V subscript H and the corresponding values of 0. Curves are also given showing the effect of small departures from… more
Date: January 1927
Creator: Diehl, Walter S.
Item Type: Refine your search to only Report
open access

The effects of fuel and cylinder gas densities on the characteristics of fuel sprays for oil engines

Description: "This investigation was conducted as a part of a general research on fuel-injection engines for aircraft. The purpose of the investigation was to determine the effects of fuel and cylinder gas densities with several characteristics of fuel sprays for oil engines. The start, growth, and cut-off of single fuel sprays produced by automatic injection valves were recorded on photographic film by means of special high-speed motion-picture apparatus" (p. 491).
Date: June 14, 1927
Creator: Joachim, W. F. & Beardsley, Edward G.
Item Type: Refine your search to only Report
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