National Advisory Committee for Aeronautics (NACA) - 4,116 Matching Results

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Ambient pressure determination at high altitudes by use of free-molecule theory

Description: From Introduction: "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 theory for use in connection with this problem."
Date: March 1, 1949
Creator: Wiener, Bernard
Partner: UNT Libraries Government Documents Department

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 1, 1948
Creator: Malkus, Willem V R; Bishop, Richard H & Briggs, Robert O
Partner: UNT Libraries Government Documents Department

Airfoil in sinusoidal motion in a pulsating stream

Description: From Introduction: "In the present paper, under the same lineaeizing assumptions as are made in the derivation in reference 1 but with the explicit consideration and simplification of the form of the wake extending from the rear of the airfoil, the methods of Theodorsen (reference 2) have been extended to obtain the forces on the airfoil not only at a fixed angle of attack but also in arbitrary motion."
Date: June 1, 1947
Creator: Greenberg, J Mayo
Partner: UNT Libraries Government Documents Department

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
Partner: UNT Libraries Government Documents Department

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
Partner: UNT Libraries Government Documents Department

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
Partner: UNT Libraries Government Documents Department

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
Partner: UNT Libraries Government Documents Department

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
Partner: UNT Libraries Government Documents Department

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
Partner: UNT Libraries Government Documents Department

An analysis of the effect of lift-drag ratio and stalling speed on landing-flare characteristics

Description: From Introduction: "The flare assumed is based primarily on reference 1, in which information permitting calculation of the flare characteristics of an airplane was obtained from flight tests. The results of calculations for airplanes having constant lift-drag ratio during the flare are plotted in chart form."
Date: September 1949
Creator: Lovell, J Calvin & Lipson, Stanley
Partner: UNT Libraries Government Documents Department

Analysis of means of improving the uncontrolled lateral motions of personal airplanes

Description: From Summary: "The purpose of this investigation was to determine whether such airplanes could be made to fly uncontrolled for an indefinite period of time without getting into dangerous attitudes and for a reasonable period of time (one to three minutes) without deviating excessively from their original course. The results of this analysis indicated that the uncontrolled motions of a personal airplane could be made safe as regards spiral tendencies and could be greatly improved as regards maintenance of course without resort to an autopilot."
Date: December 1949
Creator: Mckinney, Marion O , Jr
Partner: UNT Libraries Government Documents Department

Analytical and experimental investigation of bolted joints

Description: From Introduction: "The present paper contains the development of a recurrence formula for the bolt loads for the simplified case of a symmetrical butt joint with bolts spaced evenly in line with the applied load. The method presented herein is based on the fundamental relationship which was developed in reference 1 between the loads on any two successive bolts. The present paper also gives the results of an experimental investigation conducted to substantiate further the adequacy of the elastic theory as well as to yield additional data on the critical bolt load and the behavior of long joints in the plastic range and at the ultimate load."
Date: October 1947
Creator: Rosenfeld, Samuel J
Partner: UNT Libraries Government Documents Department

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
Partner: UNT Libraries Government Documents Department

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

Description: From Introduction: "Although the aerodynamic characteristics of the components of such configurations may be well known, the mutual interference resulting from combining the wings, as well as the wings and body, may be so great that is desirable to study the aerodynamic properties of the complete configurations. Two methods of handling this problem are presented in this report. The first method is essentially an extension of the theory for slender wing-body combinations of reference 1 to determine the load distribution, forces, and moments exerted on slender cruciform-wing and body combinations inclined simultaneously at small angles in pitch and yaw. "
Date: June 1949
Creator: Spreiter, John R
Partner: UNT Libraries Government Documents Department