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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Acceleration of high-pressure-ratio single-spool turbojet engine as determined from component performance characteristics III : effect of turbine stator adjustment
No Description digital.library.unt.edu/ark:/67531/metadc60396/
An acceleration schedule control for accelerating a turbojet engine and its use with a speed control
No Description digital.library.unt.edu/ark:/67531/metadc63981/
An acceleration schedule control for accelerating a turbojet engine and its use with a speed control
Accelerating-limiting controls for turbojet engines. digital.library.unt.edu/ark:/67531/metadc52973/
Acceleration, stress, and deflection measurements on the XB-15 bomber in gusty air
No Description digital.library.unt.edu/ark:/67531/metadc61098/
Accelerations and bottom pressures measured on a B-24D airplane in a ditching test
No Description digital.library.unt.edu/ark:/67531/metadc61135/
Accelerations and passenger harness loads measured in full-scale light-airplane crashes
No Description digital.library.unt.edu/ark:/67531/metadc56800/
Accelerations in fighter-airplane crashes
No Description digital.library.unt.edu/ark:/67531/metadc63594/
Accelerations in flight
This report deals with the accelerations obtained in flight on various airplanes at Langley Field for the purpose of obtaining the magnitude of the load factors in flight and to procure information on the behavior of an airplane in various maneuvers. The instrument used in these tests was a recording accelerometer of a new type designed by the technical staff of the National Advisory Committee for Aeronautics. The instrument consists of a flat steel spring supported rigidly at one end so that the free end may be deflected by its own weight from its neutral position by any acceleration acting at right angles to the plane of the spring. This deflection is measured by a very light tilting mirror caused to rotate by the deflection of the spring, which reflected the beam of light onto a moving film. The motion of the spring is damped by a thin aluminum vane which rotates with the spring between the poles of an electric magnet. Records were taken on landings and takeoffs, in loops, spins, spirals, and rolls. digital.library.unt.edu/ark:/67531/metadc65749/
Accelerations in flight
This work on accelerometry was done at McCook Field for the purpose of continuing the work done by other investigators and obtaining the accelerations which occur when a high-speed pursuit airplane is subjected to the more common maneuvers. The accelerations obtained in suddenly pulling out of a dive with well-balanced elevators are shown to be within 3 or 4 per cent of the theoretically possible accelerations. The maximum acceleration which a pilot can withstand depends upon the length of time the acceleration is continued. It is shown that he experiences no difficulty under the instantaneous accelerations as high as 7.8 G., but when under accelerations in excess of 4.5 G., continued for several seconds, he quickly loses his faculties. digital.library.unt.edu/ark:/67531/metadc65854/
Accelerations in Landing with a Tricycle-Type Landing Gear
In connection with the application of stable tricycle-type landing gears to transport airplanes, the question arises as to whether certain passengers may not experience relatively great accelerations in an emergency landing. Since the main landing wheels are behind the center of gravity in this type of gear, a hard-braked landing will cause immediate nosing down of the airplane and, when this motion is stopped due to the front wheel striking the ground, there will be some tendency for the rearmost passengers to be thrown out of their seats, The provided rough calculations are designed to show the magnitudes of the various reactions experienced in a severe landing under these circumstances. digital.library.unt.edu/ark:/67531/metadc65079/
Accelerations in transport-airplane crashes
No Description digital.library.unt.edu/ark:/67531/metadc56808/
Accelerations measured at center of gravity and along span of the wing of a B-24D airplane in landing impacts
No Description digital.library.unt.edu/ark:/67531/metadc61134/
Accelerometer design
In connection with the development of an accelerometer for measuring the loads on airplanes in free flight a study of the theory of such instruments has been made, and the results of this study are summarized in this report. A portion of the analysis deals particularly with the sources of error and with the limitations placed on the location of the instrument in the airplane. The discussion of the dynamics of the accelerometer includes a study of its theoretical motions and of the way in which they are affected by the natural period of vibration and by the damping, together with a report of some experiments on the effect of forced vibrations on the record. digital.library.unt.edu/ark:/67531/metadc65750/
Accepted Limit Values of Air Pollutants
Report issued by the U.S. Bureau of Mines discussing, as stated in the introduction, the "accepted maximum permissible concentrations of air pollutants from the standpoints of health, damage to vegetation, damage to property, and requirements of industrial processes" (p. 1). This report includes tables. digital.library.unt.edu/ark:/67531/metadc67065/
Accident Experience: Iron-Ore Mines, Lake Superior District, 1940-43
Report issued by the U.S. Bureau of Mines discussing the iron-ore mining accident experience in the Lake Superior District. Frequency and severity rates of accidents between 1940 and 1943 are presented. This report includes tables. digital.library.unt.edu/ark:/67531/metadc67032/
Accident-Severity Rates For Certain Metal Mines
Report issued by the U.S. Bureau of Mines on the severity of accidents in the metal-mine industry. 34 metal-mines documented the number and severity of all accidents over the course if one calendar year. This report includes tables. digital.library.unt.edu/ark:/67531/metadc38379/
Accidents from explosives at metal and nonmetallic mines
Circular produced by the U.S. Bureau of Mines to promote safety through a series of reports on accident prevention in mines. According the the scope statement, "This is the fourth section of the revised series of circulars that cover various phases of accident prevention in metal and nonmetallic mines; it give information on accidents and injuries from storing, handling, and using explosive in metal and nonmetallic mines and discusses the precautions by which they can be prevented" (p. 2). digital.library.unt.edu/ark:/67531/metadc40319/
Accounting System and Office-Management Procedure for Medium-Size Metal Mines
No Description digital.library.unt.edu/ark:/67531/metadc12541/
Accuracy of airspeed measurements and flight calibration procedures
The sources of error that may enter into the measurement of airspeed by pitot-static methods are reviewed in detail together with methods of flight calibration of airspeed installations. Special attention is given to the problem of accurate measurements of airspeed under conditions of high speed and maneuverability required of military airplanes. (author). digital.library.unt.edu/ark:/67531/metadc65478/
Accuracy of approximate methods for predicting pressures on pointed nonlifting bodies of revolution in supersonic flow
No Description digital.library.unt.edu/ark:/67531/metadc56461/
The accuracy of the substitute-stringer approach for determining the bending frequencies of multistringer box beams
No Description digital.library.unt.edu/ark:/67531/metadc57907/
An accurate and rapid method for the design of supersonic nozzles
No Description digital.library.unt.edu/ark:/67531/metadc57389/
Accurate calculation of multispar cantilever and semicantilever wings with parallel webs under direct and indirect loading
In the present report the computation is actually carried through for the case of parallel spars of equal resistance in bending without direct loading, including plotting of the influence lines; for other cases the method of calculation is explained. The development of large size airplanes can be speeded up by accurate methods of calculation such as this. digital.library.unt.edu/ark:/67531/metadc277384/
An accurate method of measuring the moments of inertia of airplanes
This note contains a description of an improved apparatus and procedure used by the NACA for determining the moments of inertia of airplanes. The method used, based on the pendulum theory, is similar to that previously used, but a recent investigation of its accuracy has resulted in the improvements described herein. The error, when using the new apparatus and procedure, has been found to be of the order of 1 per cent. digital.library.unt.edu/ark:/67531/metadc53995/
Achievement of continuous wall curvature in design of two-dimensional symmetrical supersonic nozzles
No Description digital.library.unt.edu/ark:/67531/metadc56184/
Acid-Base Behavior in Aprotic Organica Solvents
No Description digital.library.unt.edu/ark:/67531/metadc13152/
Acid-Mine-Drainage Problems: Anthracite Region of Pennsylvania
Report from the U.S. Bureau of Mines discussing the anthracite region of Pennsylvania and the efforts to prevent coal-mine drainage into nearby streams. According to the introduction, "The purpose of this report is not to develop a practicable or feasible method or process of treating acid mine water but rather to present available factual and deduced data that may be useful in showing pH range over which the treatment is to take place and the sludge products most likely to be handled" (p. 2). digital.library.unt.edu/ark:/67531/metadc12667/
Acid Processes for the Extraction of Alumina
No Description digital.library.unt.edu/ark:/67531/metadc12446/
Acoustic analysis of ram-jet buzz
No Description digital.library.unt.edu/ark:/67531/metadc57885/
Acoustic radiation from two-dimensional rectangular cutouts in aerodynamic surfaces
No Description digital.library.unt.edu/ark:/67531/metadc57843/
Acoustic, thrust, and drag characteristics of several full-scale noise suppressors for turbojet engines
No Description digital.library.unt.edu/ark:/67531/metadc57452/
Acoustical treatment for the NACA 8- by 6-foot supersonic propulsion wind tunnel
No Description digital.library.unt.edu/ark:/67531/metadc56258/
Acoustics of a nonhomogeneous moving medium.
Theoretical basis of the acoustics of a moving nonhomogeneous medium is considered in this report. Experiments that illustrate or confirm some of the theoretical explanation or derivation of these acoustics are also included. digital.library.unt.edu/ark:/67531/metadc65701/
Activation of hydrocarbons and the octane number
This report presents an examination of the history of research on engine knocking and the various types of fuels used in the investigations of this phenomenon. According to this report, the spontaneous ignition of hydrocarbons doped with oxygen follows the logarithmic law within a certain temperature range, but not above 920 degrees K. Having extended the scope of investigations to prove hydrocarbons, the curves of the mixtures burned by air should then be established by progressive replacement of pure iso-octane with heptane. Pentane was also examined in this report. digital.library.unt.edu/ark:/67531/metadc63233/
An active particle diffusion theory of flame quenching for laminar flames / Dorothy M. Simon and Frank E. Belles
An equation for quenching distance based on the destruction of chain carriers by the surface is derived. The equation expresses the quenching distance in terms of the diffusion coefficients and partial pressures of the chain carriers and gas phase molecules, the efficiency of the surface as a chain breaker, the total pressure of the mixture, and a constant which depends on the geometry of the quenching surface. Quenching distances measured by flashback for propane-air flames are shown to be consistent with the mechanism. The derived equation is used with the lean inflammability limit and a rate constant calculated from burning velocity data to estimate quenching distances for propane-air (hydrocarbon lean) flames satisfactorily. digital.library.unt.edu/ark:/67531/metadc59077/
Adaptation of a Cascade Impactor to Flight Measurement of Droplet Size in Clouds
A cascade impactor, an instrument for obtaining: the size distribution of droplets borne in a low-velocity air stream, was adapted for flight cloud droplet-size studies. The air containing the droplets was slowed down from flight speed by a diffuser to the inlet-air velocity of the impactor. The droplets that enter the impactor impinge on four slides coated with magnesium oxide. Each slide catches a different size range. The relation between the size of droplet impressions and the droplet size was evaluated so that the droplet-size distributions may be found from these slides. The magnesium oxide coating provides a permanent record. of the droplet impression that is not affected by droplet evaporation after the. droplets have impinged. digital.library.unt.edu/ark:/67531/metadc53539/
Adaptation of aeronautical engines to high altitude flying
Issues and techniques relative to the adaptation of aircraft engines to high altitude flight are discussed. Covered here are the limits of engine output, modifications and characteristics of high altitude engines, the influence of air density on the proportions of fuel mixtures, methods of varying the proportions of fuel mixtures, the automatic prevention of fuel waste, and the design and application of air pressure regulators to high altitude flying. Summary: 1. Limits of engine output. 2. High altitude engines. 3. Influence of air density on proportions of mixture. 4. Methods of varying proportions of mixture. 5. Automatic prevention of fuel waste. 6. Design and application of air pressure regulators to high altitude flying. digital.library.unt.edu/ark:/67531/metadc53936/
Adaptation of Combustion Principles to Aircraft Propulsion, Volume 2, Combustion in Air-Breathing Jet Engines
This volume continues the NACA study of combustion principles for aircraft propulsion. The various aspects of combustion pertinent to jet engines are organized and interpreted with quite extensive information, particularly for basic or fundamental. subject matter. The report concerns only air-breathing engines and hydrocarbon fuels, and not rocket engines and high-energy fuels. Since the references have been selected to illustrate important points, the bibliographies, while thorough, are not complete. This volumes describes the observed performance and design problems of engine combustors of the principal types. These include combustor-inlet conditions; starting, acceleration, combustion limits, combustion efficiency, coke deposits, and smoke formation in turbojets; ram-jet performance; and afterburner performance and design. digital.library.unt.edu/ark:/67531/metadc63711/
Adaptation of Combustion Principles to Aircraft Propulsion, Volume I, Basic Considerations in the Combustion of Hydrocarbon Fuels with Air
The report summarizes source material on combustion for flight-propulsion engineers. First, several chapters review fundamental processes such as fuel-air mixture preparation, gas flow and mixing, flammability and ignition, flame propagation in both homogenous and heterogenous media, flame stabilization, combustion oscillations, and smoke and carbon formation. The practical significance and the relation of these processes to theory are presented. A second series of chapters describes the observed performance and design problems of engine combustors of the principal types. An attempt is made to interpret performance in terms of the fundamental processes and theories previously reviewed. Third, the design of high-speed combustion systems is discussed. Combustor design principles that can be established from basic considerations and from experience with actual combustors are described. Finally, future requirements for aircraft engine combustion systems are examined. digital.library.unt.edu/ark:/67531/metadc61037/
Adaptor for measuring principal strains with Tuckerman strain gage
An adapter is described which uses three Tuckerman optical strain gages to measure the displacement of the three vortices of an equilateral triangle along lines 120 degrees apart. These displacements are substituted in well-known equations in order to compute the magnitude and direction of the principal strains. Tests of the adaptor indicate that principal strains over a gage length of 1.42 inch may be measured with a systematic error not exceeding 4 percent and a mean observational error of the order of + or minus 0.000006. The maximum observed error in strain was of the order of 0.00006. The directions of principal strains for unidirectional stress were measured with the adaptor with an average error of the order of 1 degree. digital.library.unt.edu/ark:/67531/metadc56629/
Addendum to Hazard Summary Report Experimental Breeder Reactor-II (EBR-II)
Report containing hazard and safety information regarding the Experimental Breeder Reactor-II in Idaho. digital.library.unt.edu/ark:/67531/metadc11522/
Addition of heat to a compressible fluid in motion
No Description digital.library.unt.edu/ark:/67531/metadc62512/
Additional abstracts pertaining to seaplanes
No Description digital.library.unt.edu/ark:/67531/metadc53128/
Additional comparisons between computed and measured transonic drag-rise coefficients at zero lift for wing-body-tail configurations
No Description digital.library.unt.edu/ark:/67531/metadc61416/
Additional design charts relating to the stalling of tapered wings
No Description digital.library.unt.edu/ark:/67531/metadc61269/
Additional experimental heat-transfer and durability data on several forced-convection, air-cooled, strut-supported turbine blades of improved design
No Description digital.library.unt.edu/ark:/67531/metadc60906/
Additional experiments with flat-top wing- body combinations at high supersonic speeds
Flat top wing body configuration effects on aerodynamic characteristics of supersonic aircraft. digital.library.unt.edu/ark:/67531/metadc53065/
Additional fatigue tests on effects of design details in 355-T6 sand-cast aluminum alloy
No Description digital.library.unt.edu/ark:/67531/metadc59956/
Additional free-flight tests of the rolling effectiveness of several wing-spoiler arrangements at high subsonic, transonic, and supersonic speeds
No Description digital.library.unt.edu/ark:/67531/metadc58001/
An additional investigation of the high-speed lateral-control characteristics of spoilers
No Description digital.library.unt.edu/ark:/67531/metadc60955/