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Aerodynamic Properties of Slender Wing-Body Combinations at Subsonic, Transonic, and Supersonic Speeds

Description: From Introduction: "In an incomprehensible medium, the mutual interference of a fuselage and wing of high-aspect ratio (to which lifting-line theory is applicable) has been treated by Lennertz, Wiselsberger, Pepper, and Multhopp in reference 1, 2, 3, and 4. It is the purpose of this note to treat the effect of on the aerodynamic loading of the mutual interference between a low-aspect-ratio pointed wing and a fuselage consisting of a slender body of revolution."
Date: July 1948
Creator: Spreiter, John R.
Item Type: Refine your search to only Report
open access

Aerodynamics characteristics of 24 NACA 16-series airfoils at Mach numbers between 0.3 and 0.8

Description: Report presenting an investigation to determine the aerodynamic characteristics of a group of NACA 16-series airfoils related in camber and thickness over a range of Mach numbers. All of the currently available force-test data for NACA 16-series airfoils obtained under the same test conditions in the 24-inch high-speed tunnel are presented.
Date: September 1948
Creator: Lindsey, W. F.; Stevenson, D. B. & Daley, Bernard N.
Item Type: Refine your search to only Report
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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
open access

Analysis of Performance of a Jet Engine From Characteristics of Components 2: Interaction of Components as Determined From Engine Operation

Description: Report presenting an investigation of a method to analyze and to estimate performance of jet engines, which was applied to the study of the characteristics of a research turbojet engine built for the investigation. Results regarding the compressor performance, turbine performance, combustion chamber, and interaction of jet engine components are provided.
Date: September 1948
Creator: Goldstein, Arthur W.; Alpert, Sumner; Beede, William & Kovach, Karl
Item Type: Refine your search to only Report
open access

Analysis of planing data for use in predicting hydrodynamic impact loads

Description: From Introduction: "The magnitude of hydrodynamic loads experienced by seaplanes during a landing impact has been investigated experimentally and theoretically by the National Advisory Committee for Aeronautics. The results as reported in references 1 and 2 provide a rational means of determining loads on conventional V-bottom hulls in a step landing."
Date: August 1948
Creator: Steiner, Margaret F.
Item Type: Refine your search to only Report
open access

An analysis of the airspeed and normal accelerations of Douglas DC-2 airplanes in commercial transport operation

Description: From Introduction: "This paper summarizes the results of an analysis of V-G records taken on Douglas DC-2 airplanes during the period from June 1935 to December 1940. The operational life is compared with the operational lives of other airplanes flown on different routes during the corresponding period."
Date: November 1948
Creator: Walker, Walter G.
Item Type: Refine your search to only Report
open access

An analysis of the airspeeds and normal accelerations of Boeing B-247 and B-247D airplanes in commercial transport operation

Description: From Introduction: "The results of analyses of V-G data given in references 1 to 5 have shown that the flight loads of airplanes operated in commercial transport service are influenced by operating speeds and by forecasting and dispatching practices as reflected in differences between operations during the prewar and wartime periods. The available data are summarized and the flight results are compared with the results of analyses made in references 1 to 5."
Date: December 1948
Creator: Walker, Walter G. & Hadlock, Ivan K.
Item Type: Refine your search to only Report
open access

An analysis of the airspeeds and normal accelerations of Martin M-130 airplanes in commercial transport operation

Description: From Introduction: "Acceleration and airspeed data obtained from V-G records collected during commercial transport operations (references 1 and 2) are being analyzed in some detail to determine the flight loads and operating speeds as functions of airplane, route, season, and prewar and wartime operations."
Date: September 1948
Creator: Walker, Walter G.
Item Type: Refine your search to only Report
open access

An analysis of the airspeeds and normal accelerations of Sikorsky S-42A airplanes in commercial transport operation

Description: From Introduction: "This paper gives the results of an analysis of V-G data taken on four Sikorsky S-42A flying boats operated on Caribbean routes and along the east coast of South America during the period from 1936 to 1939. The available S-42A data are summarized and flight-load results are compared with the results of analyses made in the past."
Date: October 1948
Creator: Walker, Walter G.
Item Type: Refine your search to only Report
open access

An Analysis of the Variation With Altitude of Effective Gust Velocity in Convective-Type Clouds

Description: From Introduction: "In the present paper, the variation of effective gust velocity in convective-type clouds with altitude is investigated. Data obtained during 1941 and 1942 at altitudes up to 34,000 feet and data obtained more recently from the Thunderstorm Project (reference 5) at altitudes up to 26,000 feet are utilized for this purpose. Consideration is given in analyzing the results both to data for the range
Date: June 1948
Creator: Tolefson, H. B.
Item Type: Refine your search to only Report
open access

Analytical and experimental performance of an explosion-cycle combustion chamber for a jet-propulsion engine

Description: From Introduction: "The results of analytical and experimental investigations conducted at the NACA Cleveland laboratory to determine the performance of an explosion-cycle combustion chamber with a timed inlet valve and several fixed-area exhaust nozzles are presented herein. These values are compared with theoretical values obtained from an analysis of an ideal constant-volume cycle and an approximate constant-volume cycle, which is presented."
Date: September 1948
Creator: Zipkin, Morris A. & Lewis, George W., Jr.
Item Type: Refine your search to only Report
open access

Analytical Method of Determining Transmission of Particles and Radiation Through Great Thickness of Matter

Description: "A matrix method of determining transmission, scattering, and absorption of radiation, such as gamma rays and neutrons, in large thickness of matter is presented. Experimental data as yet unavailable are required for complete utilization of the method. Material radioactivity whose intensity may be considered to be independent of time is also treated" (p. 1).
Date: September 1948
Creator: Bobrowsky, A. R.
Item Type: Refine your search to only Report
open access

An application of Falkner's surface-loading method to predictions of hinge-moment parameters for swept-back wings

Description: Report presenting an application of the Falkner lifting-surface-theory method to predicting hinge-moment and lift parameters for sweptback plan forms in order to develop an analogue to the existing lifting-surface-theory procedure for prediction of these parameters on unswept plan forms. For two specific plan forms, the hinge-moment predictions based on the Falkner method were not in good agreement with experimental values.
Date: February 1948
Creator: Jones, Arthur L. & Sluder, Loma
Item Type: Refine your search to only Report
open access

Application of Statistical Methods to Study of Gas-Turbine Blade Failures

Description: Note presenting an investigation conducted to determine the applicability of statistical methods as an approach to the evaluation of materials for use in gas turbines by determining the frequency distribution of time until failure of gas-turbine blades. Two wheels, each incorporating 142 inserted blades of a cast cobalt-base heat-resistant alloy, were tested. The results indicated that the time for first failure may not generally be taken as an accurate indication of the performance of the aver… more
Date: June 1948
Creator: Hoffman, Charles A. & Ault, G. Mervin
Item Type: Refine your search to only Report
open access

Application of the linearized theory of supersonic flow to the estimation of control-surface characteristics

Description: Report presenting the use of known conical-flow solutions of the linearized equation for the velocity potential in supersonic flow as applied to the calculation of the characteristics of control surfaces. Solutions for the pressure distributions are obtained for control surfaces with hinge lines swept ahead or behind the Mach line when the control-surface trialing edge is swept ahead of the Mach line.
Date: March 1948
Creator: Frick, Charles W., Jr.
Item Type: Refine your search to only Report
open access

Appreciation and Prediction of Flying Qualities

Description: Note presenting a summary of some results of recent research that will aid the designers of an airplane in selecting or modifying a configuration to provide satisfactory stability and control characteristics. A discussion is given of the reasons for the requirements, of the factors involved in obtaining satisfactory flying qualities, and of the methods used in predicting the stability and control characteristics of the airplane.
Date: August 1948
Creator: Phillips, William Hewitt
Item Type: Refine your search to only Report
open access

An approximate determination of the lift of slender cylindrical bodies and wing-body combinations at very high supersonic speeds

Description: Report presenting a theory for very high supersonic flow as applied to determine a first approximation to the pressure distribution, lift, and drag due to lift for a slender cylindrical body of revolution and a wing-body combination. The method indicates that the flow effectively separates from the body before reaching the widest part of the cross section.
Date: October 1948
Creator: Ivey, H. Reese & Morrissette, Robert R.
Item Type: Refine your search to only Report
open access

Approximate Relations and Charts for Low-Speed Stability Derivatives of Swept Wings

Description: Contains derivations, based on a simplified theory, of approximate relations for low-speed stability derivatives of swept wings. Method accounts for the effects and, in most cases, taper ratio. Charts, based on the derived relations, are presented for the stability derivatives of untapered swept wings. Calculated values of the derivatives are compared with experimental results.
Date: May 1948
Creator: Toll, Thomas A. & Queijo, M. J.
Item Type: Refine your search to only Report
open access

Approximate relations for hinge-moment parameters of control surfaces on swept wings at low Mach numbers

Description: Report presenting an approximate method of accounting for the effects of sweep as applied to previously determined equations for the hinge-moment parameters of control surfaces on unswept wings. Results regarding the comparison with experiment and limitations of the method are provided.
Date: October 1948
Creator: Toll, Thomas A. & Schneiter, Leslie E.
Item Type: Refine your search to only Report
open access

Axial fatigue tests at zero mean stress of 24S-T and 75S-T aluminum-alloy strips with a central circular hole

Description: From Summary: "Axial fatigue tests at zero mean stress have been made on 0.032- and 0.064-inch 24S-T and 0.032-inch 75S-T sheet-metal specimens 1/4, 1/2, 1, and 2 inches wide without a hole and with central holes giving a range of hole diameter D to specimen width W from 0.01 to 0.95. No systematic difference was noted between the results for the 0.032-inch and the 0.064-inch specimens although the latter seemed the more consistent. In general the fatigue strength based on the minimum section d… more
Date: August 1948
Creator: Brueggeman, W. C. & Mayer, M., Jr.
Item Type: Refine your search to only Report
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