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Calculation of Airplane Performances Without the Aid of Polar Diagrams

Description: For good profiles the profile-drag coefficient is almost constant in the whole range which comes into consideration for practical flight. This is manifest in the consideration of the Gottingen airfoil tests and is confirmed by the investigations of the writer (measurements of the profile drag during flight by the Betz method), concerning which a detailed report will soon be published. The following deductions proceed from this fact. The formulas developed on the assumptions of a constant profile-drag coefficient afford an extensive insight into the influences exerted on flight performances by the structure of the airplane.
Date: March 1928
Creator: Schrenk, Martin
Partner: UNT Libraries Government Documents Department

General Formulas and Charts for the Calculation of Airplane Performance

Description: This report presents general formulas for the determination of all major airplane performance characteristics. A rigorous analysis is used, making no assumption regarding the attitude of the airplane at which maximum rate of climb occurs, but finding the attitude at which the excess thrust horsepower is maximum. Equations and charts are developed which show the variation of performance due to a change in any of the customary design parameters.
Date: 1932
Creator: Oswald, W. Bailey
Partner: UNT Libraries Government Documents Department

Manifest Anxiety and Task as Determiners of Performance in Paired Associate Learning

Description: The purpose of the present study was to investigate the relationship between drive level, defined in terms of scores on the Taylor Manifest Anxiety Scale, and performance in a complex paired-associate learning task, in which an attempt was made to control the number and strength of the competing responses.
Date: August 1965
Creator: Brown, Bill Rondol
Partner: UNT Libraries

General Airplane Performance

Description: "Equations have been developed for the analysis of the performance of the ideal airplane, leading to an approximate physical interpretation of the performance problem. The basic sea-level airplane parameters have been generalized to altitude parameters and a new parameter has been introduced and physically interpreted. The performance analysis for actual airplanes has been obtained in terms of the equivalent ideal airplane in order that the charts developed for use in practical calculations will for the most part apply to any type of engine-propeller combination and system of control, the only additional material required consisting of the actual engine and propeller curves for propulsion unit" (p. 241).
Date: June 1, 1937
Creator: Rockfeller, W. C.
Partner: UNT Libraries Government Documents Department

An Analysis of Teacher Performance Evaluation Policies and Criteria in Texas Public Schools

Description: The purposes of this study were to identify the procedures and criteria used for conducting teacher performance evaluation in Texas public schools, to determine the degree to which teacher performance evaluation procedures and instruments reflect the stated evaluation policies of Texas public schools, and to determine the degree to which teacher performance evaluation instruments used in Texas public schools reflect presage criteria (teacher characteristics) as opposed to process criteria (teacher behavior) as opposed to product criteria (student change or gain) as opposed to general job performance requirements (job expectations). The main findings include the following. (1) Teacher performance evaluation is required in all Texas public school districts and is often performed several times a year by more than one observer. The building principal is the key person involved in this process. (2) Although all school districts stated the supervisory function of the improvement of instruction as the major purpose of their teacher performance evaluation policy, a large number of school districts utilize teacher performance evaluation for the administration functions of serving as a basis for retention or dismissal. (3) If in reality teacher performance evaluation were construed as the improvement of instruction or teaching performance, it should be predictable that process criteria (teacher behavior) would account for the majority of items in the evaluation instruments. However, these items accounted for only about one-fourth of the total number. At the same time, items relating to general job requirements accounted for over 50 percent of the items. This exhibits a maintenance rather than teaching thrust. (4) The data gathered on current teacher performance evaluation instruments appear to be highly pertinent to maintaining the school as an organization and appear to be helpful in making personnel decisions. (5) Teacher performance evaluation instruments in Texas public schools are much more heavily weighted toward assessing ...
Date: December 1986
Creator: Marlin, Thomas William
Partner: UNT Libraries

Rhapsody in Green - A Happening: An Examination of the Happening as a Rhetorical Tool

Description: In this study I outline seven characteristics of a traditional Happening (the use of games and play, an inherent intertextual element, an emphasis on place/space, an element/spirit of anarchy, an element of chance, an emphasis on the fusion of art with everyday life, and the existence of both a purpose and a meaning) and seek to determine which characteristics contribute to the Happening's current usage as a rhetorical tool. I created a traditional Happening containing a message of environmental consumption and destruction, and surveyed audience members regarding their interpretation and experience. The survey responses were coded using a top-down narrative analysis. I discovered that intertextuality, place/space, and the fusion of art with everyday life are particularly effective communicators of a message in a socially or politically conscious Happening.
Date: December 2004
Creator: Walker, Rebecca Ann
Partner: UNT Libraries

Loitering and range performance of turbojet-powered aircraft determined by off-design engine cycle analysis

Description: From Summary: "The loitering and range performance of airplanes equipped with several different turbojet engines was analytically investigated by applying the results of off-design cycle analyses to specific airplane characteristics. The method of off-design cycle analysis is presented herein and is verified by a check with experimental data. For all engines considered, the loitering and the range fuel flows obtained with rated tail-pipe nozzle area, variable engine speed operations were within 2 or 3 percent of the optimum fuel flow obtainable with any method of engines operation. The optimum loitering altitude generally occurred between approximately 25,000 and 35,000 feet with corresponding optimum flight Mach numbers of 0.4 to 0.65. In general, the optimum range fuel flows occurred at 3000 to 5000 feet higher altitude and at approximately 0.15 higher flight Mach numbers than the optimum loitering fuel flow."
Date: February 5, 1952
Creator: Koutz, Stanley L. & Hensley, Reece V.
Partner: UNT Libraries Government Documents Department

A Musical/Visual Performance: "A Cat on the Piano"

Description: In the visual arts, I was interested in creating patterns with clay, glass, and metal, utilizing the visual elements (line, color, shape and texture). I arranged, rearranged, and distorted the elements until I obtained a fragmented, yet, unified pattern. My visual ideas were rhythmical (gestural) in nature with or without the direct stimulus of music. Concepts originated in my mind with symbols and sounds simultaneously.
Date: May 1983
Creator: Ang, Stephen
Partner: UNT Libraries

Test Anxiety and Performance on the Wechsler Intelligence Scale for Children

Description: Although the significance of anxiety has long been recognized and explored within the framework of psychoanalysis, it was not until after World War II that it began to influence research in psychology. The manipulation of anxiety as a research variable has taken place both within and without the framework of psychoanalytic theory. The primary purpose of the present study was to determine the relationship between test anxiety, as determined by scores on the TASC, and performance on the Wechsler Intelliaence Scale for Children. TASC scores were compared to Verbal Scale, Performance Scale, Full Scale, and individual subtest scores on the WISC.
Date: January 1968
Creator: Leonard, Mary Lois
Partner: UNT Libraries

The Relationship of Expectancy of Success to Objective Probability and Consequences of Performance

Description: The work reviews a article published by N. T. Feather about five approaches which relate to the analysis of behavior in a choice situation where a decision is made between alternatives having different subjective probabilities of attainment. The relationship between choice potential and success probability is affect by the type of situation in which the choice is made.
Date: January 1968
Creator: Stephens, George Douglas
Partner: UNT Libraries

The Relationship of Anxiety, Reported Ability to Swim, and a Perceptual-Motor Skill

Description: The problems relevant to this study are concerned with the effect of specific performance criteria on the MAS. The purpose of this study is to determine if MAS scores are related to the following: (1) a subject's inability to swim, (2) a subject's performance on a pursuit rotor task, (3) the effects of an interaction of these criteria.
Date: May 1968
Creator: Sick, Robert H.
Partner: UNT Libraries

The Relationship of Anxiety to Critical Thinking

Description: Anxiety increase drive level and will at first lead to an increased level of performance and then, as drive level continues to rise, to a decrease in performance. There seems to be an optimal level condition for best performance. On either side of this point, performance is relatively impaired. However, nothing has been done to explore directly its relationship to critical thinking ability. The purpose of this study was to investigate that relationship.
Date: August 1971
Creator: Perkins, Fredda M.
Partner: UNT Libraries

Freud's Objective Anxiety and College Performance

Description: It was the position of this study that the Hullian theoretical concept of anxiety as a drive is inappropriate in relation to an understanding of the effects of anxiety on the complexities of college performance. The present study also viewed performance in the college setting as differing from most of the related variables presented in the literature to which anxiety was connected.
Date: August 1966
Creator: Sessions, Don Edwin
Partner: UNT Libraries

Effects of Nature of Cooling Surface on Radiator Performance

Description: This report discusses the effects of roughness, smoothness, and cleanness of cooling surfaces on the performance of aeronautic radiators, as shown by experimental work, with different conditions of surface, on (1) heat transfer from a single brass tube and from a radiator; (2) pressure drop in an air stream in a single brass tube and in a radiator; (3) head resistance of a radiator; and (4) flow of air through a radiator. It is shown that while smooth surfaces are better than rough, the surfaces usually found in commercial radiators do not differ enough to show marked effect on performance, provided the surfaces are kept clean.
Date: 1921
Creator: Parsons, S. R. & Kleinschmidt, R. V.
Partner: UNT Libraries Government Documents Department

The Effect of Weight and Drag on the Sinking Speed and Lift/Drag Ratio of Gliders

Description: The most important factors in evaluating performance of gliders are minimum sinking speed and minimum gliding angle. To assure their optimum value the energy necessary for flight, that is, the energy of lift and friction must be kept very low, or in other words, weight and total drag which have a decisive effect on the sinking speed and on the gliding angle, must be kept to a minimum. How great the effect of a reduction of these two quantities will be shown in the following.
Date: December 1934
Creator: Kosin, R.
Partner: UNT Libraries Government Documents Department

Summary of the Availability and Performance Problems of High Octane Number Fuels

Description: Memorandum presenting a study to determine the possible blending agents or additives that may be used to supplement current high performance number, rich rating components in future aviation fuels. The study indicated that such high rich rating blending agents as toluene and xylene cannot be made available in sufficient quantities to maintain the rich rating performance of the fuels when reducing the lead content from 4.6 to 3.0 ml per gallon.
Date: April 15, 1949
Creator: NACA Committee on Aircraft Fuels
Partner: UNT Libraries Government Documents Department

Performance and Ranges of Application of Various Types of Aircraft-Propulsion System

Description: Note presenting a discussion of the performance characteristics of the compound engine, the turbine-propeller engine, the turbojet engine, the turbo ramjet engine, the ramjet engine, and the rocket engine. Insight is provided into the proper position of each of these engine types in the speed-range spectrum of aircraft operation. It is shown that the compound engine, which has the greatest weight per unit thrust and also the lowest specific fuel consumption, gives the longest range.
Date: August 1947
Creator: Cleveland Laboratory Staff
Partner: UNT Libraries Government Documents Department

Performance Characteristics of a Normal-Shock Side Inlet Located Downstream of a Canard Control Surface at Mach Numbers of 1.5 and 1.8

Description: The performance characteristics of a downward canted normal-shock side (scoop) inlet located downstream of a triangular control surface are presented for free-stream Mach numbers of 1.5 and 1.8 in terms of total pressure recovery and mass flow ratio for various boundary-layer removal systems, angles of attack, control surface deflections and adverse yaw. An engine operating condition for a hypothetical turbojet engine is established, and the match point characteristics of the engine-inlet configuration are summarized. It is shown that the diffuser performance increases with increased boundary-layer removal and decreases because of the presence of the wake from the forward control surface.
Date: July 29, 1952
Creator: Dryer, Murray & Beke, Andrew
Partner: UNT Libraries Government Documents Department

Performance Characteristics of a Double-Cylindrical-Shroud Ejector Nozzle

Description: Memorandum presenting an investigation of the performance characteristics of a double-shroud ejector for the purpose of evaluating its effectiveness as an exit nozzle. Calculations based on ejector performance data, taken with the ejector discharging into quiescent air, indicate that thrust performance on the order of ideal nozzle thrust may be obtained over a Mach number range of 0.8 to 2.3 from a double-shroud ejector. The results of a simplified theoretical analysis are in fair agreement with those experimentally obtained.
Date: November 24, 1953
Creator: Reshotko, Eli
Partner: UNT Libraries Government Documents Department

An Investigation of Aircraft Heaters 21: Measured and Predicted Performance of a Flattened-Tube Type Crossflow Exhaust Gas and Air Heat Exchanger

Description: Report presenting data on the thermal performance and the static pressure drop characteristics of a flattened-tube type crossflow exhaust gas and air heat exchanger. The measured thermal outputs and static pressure drops are compared with predicted magnitudes.
Date: April 1945
Creator: Boelter, L. M. K.; Guibert, A. G.; Rademacher, J. M.; Romie, F. E.; Sanders, V. D. & Sloggy, L. J. B.
Partner: UNT Libraries Government Documents Department

Flight Investigation of the Effect of Atmospheric Turbulence on the Climb Performance of an Airplane

Description: Note presenting the results of an investigation consisting of a series of one-engine climb tests with a twin-engine transport airplane, which indicate that light turbulence of the type generally present in clear air over flat terrain has no significant effect on the average rate of climb for a series of runs. Turbulence does, however, increase the variation in the rate of climb from run to run. Results regarding mean rate of climb, standard deviation of the rate of climb, effects of climb duration, and implications of these results are provided.
Date: October 1951
Creator: Press, Harry & McClanahan, Herbert C., Jr.
Partner: UNT Libraries Government Documents Department