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Airplane Crashes: Engine Troubles: A Possible Explanation

Description: The aim was to bring attention to what might be the cause of some aircraft accidents for which there was no satisfactory explanation. The author notes that in testing aircraft accidents at the Bureau of Standards, it happened frequently that the engine performance became erratic when the temperature of the air entering the carburetor was between 0 C and 20 C. Investigation revealed the trouble to have been caused by the formation and collection of snow somewhere between the entrance to the carb… more
Date: March 1921
Creator: Sparrow, Stanwood W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Airplane Performance as Influenced by the Use of a Supercharged Engine

Description: "The question of the influence of a supercharged engine on airplane performance is treated here in a first approximation, but one that gives an exact idea of the advantage of supercharging. Considered here is an airplane that climbs first with an ordinary engine, not supercharged, and afterwards climbs with a supercharged engine. The aim is to find the difference of the ceilings reached in the two cases" (p. 1).
Date: May 1920
Creator: de Bothezat, George
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Airplane Superchargers

Description: Discussed here are the principles and operation of aircraft engine superchargers used to maintain and increase engine power as aircraft encounter decreases in the density of air as altitude rises. Details are given on the design and operation of the centrifugal compressors. A method is given for calculating the amount of power needed to drive a compressor. The effects of the use of a compressor on fuel system operation and design are discussed. Several specific superchargers that were in operat… more
Date: May 1921
Creator: Noack, W. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Alterations and Tests of The "Farnboro" Engine Indicator

Description: "The 'Farnboro' electric indicator was tested as received from the manufacturers, and modifications made to the instrument to improve its operation. The original design of disk valve was altered so as to reduce the mass, travel, and seat area. Changes were made to the recording mechanism, which included a new method of locating the top center position on the record. The effect of friction on the motion of the pointer while taking motoring and power cards was eliminated by providing a means of p… more
Date: September 1930
Creator: Collins, John H., Jr.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An Altitude Chamber for the Study and Calibration of Aeronautical Instruments

Description: "The design and construction of an altitude chamber, in which both pressure and temperature can be varied independently, was carried out by the NACA at the Langley Memorial Aeronautical Laboratory for the purpose of studying the effects of temperature and pressure on aeronautical research instruments. Temperatures from +20c to -50c are obtained by the expansion of CO2from standard containers. The chamber can be used for the calibration of research instruments under altitude conditions simulatin… more
Date: November 1925
Creator: Reid, H. J. E. & Kirchner, Otto E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Ambient Pressure Determination at High Altitudes by Use of Free-Molecule Theory

Description: "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 th… more
Date: March 1949
Creator: Wiener, Bernard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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The Ames 10- by 14-Inch Supersonic Wind Tunnel

Description: "The purpose of the present report is to describe the 10- by 14-inch supersonic wind tunnel and its operational characteristics over the nominal Mach number range from 2.7 to 6.3. Rather complete calibration data on characteristics of flow in the test section are presented and briefly discussed" (p. 2).
Date: January 1954
Creator: Eggers, A. J., Jr. & Nothwang, George J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analogue-computer simulation of an autopilot servo system having nonlinear response characteristics

Description: From Introduction: "The servo system considered in this report is in the latter category, due mainly to the fact its amplifier tends to saturate. An investigation of the longitudinal dynamic response of the stabilized airplane was made and the results were reported in reference 1. In this investigation it was found that when restricted to linear methods of analysis the performance of the autopilot-aircraft combination could be predicted for only the small range of operation where the elements o… more
Date: June 1952
Creator: Jones, Arthur L. & White, John S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis and comparison with theory of flow-field measurements near a lifting rotor in the Langley full-scale tunnel

Description: From Introduction: "The time-averaged flows are considerably simpler to deal with theoretically than are the instantaneous flows, and the results of several theoretical analyses are available (refs. 2 to 6, for example). Several previous experimental investigations (see ref. 7 for a bibliography) have provided some qualitative information on the subject by the use of smoke in flight and in wind tunnels. However, quantitative measurements (refs. 8 to 10) are extremely scarce and, in general, are… more
Date: April 1956
Creator: Heyson, Harry H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis and Model Tests of Autogiro Jump Take-Off

Description: From Introduction: "The possibilities of the jump take-off have been established by some full-scale experiments. It is the purpose of this paper to study the factors that govern the jump take-off in its simplest form and to present the results of model tests in which the effect of differences in the rotor parameters was determined."
Date: October 1936
Creator: Wheatley, John B. & Bioletti, Carlton
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis and Preliminary Design of an Optical Instrument for the Measurement of Drop Size and Free-Water Content of Clouds

Description: From Summary: "This paper describes a method for the determination of drop size and free water in clouds, based on the interpretation of an artificially created rainbow. Details of the design and operation of an optical instrument employing this method are presented."
Date: June 1948
Creator: Malkus, Willem V. R.; Bishop, Richard H. & Briggs, Robert O.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis for Control Application of Dynamic Characteristics of Turbojet Engine With Tail-Pipe Burning

Description: "The first basic problem that must be solved before control synthesis can proceed is that of determining the dynamic characteristics of the engine. Accordingly, an analysis of the dynamic behavior of the turbojet engine with tail-pipe burning was made at the NACA Lewis laboratory and is presented herein" (p. 1).
Date: September 1950
Creator: Feder, Melvin S. & Hood, Richard
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of a spin and recovery from time histories of attitudes and velocities as determined for a dynamic model of a contemporary fighter airplane in the free-spinning tunnel

Description: From Introduction: "In this paper are presented descriptions of the camera setups and associated equipment, the equations and methods used in determining the model attitudes and motions from the film, and time-history curves of the variables of the spin and recovery investigated. Discussions of the nature of the spin and recovery obtained and of factors ostensibly affecting these motions are included."
Date: April 1956
Creator: Scher, Stanley H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of a Strut With a Single Elastic Support in the Span, With Applications to the Design of Airplane Jury-Strut Systems

Description: Report presenting an analysis of a wing brace with a small auxiliary strut, which is attached to the wing spar at the upper end. The design is quite effective but has some difficult analysis problems. The report is broken into two parts; one is a theoretical investigation and one is an experimental investigation.
Date: May 1935
Creator: Schwartz, A. Murray & Bogert, Reid
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of acceleration, airspeed, and gust-velocity data from a four-engine transport airplane in operations on an eastern United States route

Description: Report presenting time-history data obtained by the NACA VGH recorder from a model of a four-engine civil transport airplane during operations on an eastern United States route in order to determine magnitude and frequency of occurrence of gusts, gust accelerations, and associated airspeeds. The results are compared with results from two similar operations. The gust-load history for the operation was more severe than that for the other two operations.
Date: September 1955
Creator: Coleman, Thomas L. & Fetner, Mary W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of acceleration, airspeed, and gust-velocity data from one type of four-engine transport airplane operated over two domestic routes

Description: From Introduction: "As part of a continuing study of the gust and load histories for transport airplanes (see, for example, refs. 1 and 2), samples of VGH records have been obtained from two four-engine commercial transport airplanes. The data samples represent 839 and 1,080 flight hours of operation on two transcontinental routes and cover operations up to an altitude of 25,000 feet."
Date: October 1955
Creator: Copp, Martin R. & Coleman, Thomas L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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An analysis of accelerations, airspeeds, and gust velocities from three commercial operations of one type of medium-altitude transport airplane

Description: From Introduction: "Past analyses of data from the NACA V-G and the NACA VGH recorders (see, for example, refs. 1 and 2) have yielded information on the magnitude and frequency of occurrence of gust and maneuver accelerations, and the associated airspeeds and altitudes for several types of airplanes flown by different operators on various routes."
Date: March 1955
Creator: Coleman, Thomas L.; Copp, Martin R.; Walker, Walter G. & Engel, Jerome N.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of accelerations, gust velocities, and airspeeds from operations of a twin-engine transport airplane on a transcontinental route from 1950 to 1952

Description: Report presenting time-history data obtained from one type of twin-engine transport airplane during two years of operations on a transcontinental route, which is analyzed in order to determine the magnitude and frequency of occurrence of gust accelerations, gust velocities, and associated airspeeds and altitudes. The gusts were found to be in good agreement with those previously reported for another type of twin-engine transport airplane.
Date: February 1955
Creator: Coleman, Thomas L. & Walker, Walter G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

An analysis of airspeed, altitude, and acceleration data obtained from a twin-engine transport airplane operated over a feeder-line route in the Rocky Mountains

Description: "Time-history data of airspeed, altitude, and acceleration obtained with the NACA VGH recorder from a twin-engine airplane operated by a regional feeder airline in the Rocky Mountains are evaluated to determine the magnitude and frequency of occurrence of gusts and gust accelerations and the operating airspeeds and altitudes. The results obtained are compared with the results previously obtained from a representative short-haul and long-haul operation" (p. 1).
Date: October 1956
Creator: Copp, Martin R. & Fetner, Mary W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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