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The vertical, longitudinal, and lateral accelerations experienced by an S. E. 5a airplane while maneuvering

Description: "This investigation was carried out by the Langley Field Laboratory of the National Advisory Committee for Aeronautics for the purpose of measuring the accelerations along the three principal axes of an airplane while it was maneuvering. The airplane selected for this purpose was the fairly maneuverable SE-5A and the instruments used were the NACA three component accelerometer and the NACA recording airspeed meter. The results showed that the normal accelerations did not exceed 4.000 G. While t… more
Date: 1924
Creator: Norton, F. H. & Carroll, T.
Partner: UNT Libraries Government Documents Department
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The Inertial Coefficients of an Airship in a Frictionless Fluid

Description: This report deals with the investigation of the apparent inertia of an airship hull. The exact solution of the aerodynamical problem has been studied for hulls of various shapes and special attention has been given to the case of an ellipsoidal hull. In order that the results for this last case may be readily adapted to other cases, they are expressed in terms of the area and perimeter of the largest cross section perpendicular to the direction motion by means of a formula involving a coefficie… more
Date: 1924
Creator: Bateman, H.
Partner: UNT Libraries Government Documents Department
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The aerodynamic plane table

Description: This report gives the description and the use of a specially designed aerodynamic plane table.
Date: 1924
Creator: Zahm, A. F.
Partner: UNT Libraries Government Documents Department
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The Measurement of the Damping in Roll on a JN4h in Flight

Description: "This investigation was carried out by the National Advisory Committee for Aeronautics for the purpose of measuring the value of L sub P in flight. The method consisted in flying with heavy weights on each wing tip, suddenly releasing one of them, and allowing the airplane to roll up to 90 degrees with controls held in neutral while a record was being taken of the airspeed, and angular velocity about the X axis. The results are of interest as they show that the damping found in the wind tunnel … more
Date: 1924
Creator: Norton, F. H.
Partner: UNT Libraries Government Documents Department
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The Effect of Airfoil Thickness and Plan Form on Lateral Control

Description: This investigation was carried out for the purpose of determining the effectiveness of ailerons and tests were made on six model airfoils in the no. 1 wind tunnel of the National Advisory Committee for Aeronautics. The method consisted in measuring the rolling moments and aileron moments in the ordinary way.The results show that the thickness of the airfoil has very little effect on either the rolling moment or the hinge moment, although the resulting efficiency is somewhat higher for the taper… more
Date: 1924
Creator: Hoot, H. I.
Partner: UNT Libraries Government Documents Department
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A Study of Longitudinal Dynamic Stability in Flight

Description: "This investigation was carried out by the aerodynamic staff of the National Advisory Committee for Aeronautics for the purpose of studying experimentally the longitudinal dynamic stability of airplanes in flight. The airplanes selected for this purpose were a standard rigged VE-7 advanced-training airplane and a JN4H with special tail surfaces. The airplanes were caused to oscillate by means of the elevator, then the longitudinal control was either locked or kept free while the oscillation die… more
Date: 1924
Creator: Norton, F. H.
Partner: UNT Libraries Government Documents Department
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Engine performance and the determination of absolute ceiling

Description: From Summary: "This report contains a brief study of the variation of engine power with temperature and pressure. The variation of propeller efficiency in standard atmosphere is obtained from the general efficiency curve which is developed in NACA report no. 168. The variation of both power available and power required are then determined and curves plotted, so that the absolute ceiling may be read directly from any known sea-level value of the ratio of power available to power required."
Date: January 1924
Creator: Diehl, Walter S.
Partner: UNT Libraries Government Documents Department
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Dynamic Stability as Affected by the Longitudinal Moment of Inertia

Description: "In a recent Technical Note (NACA-TN-115, October, 1922), Norton and Carrol have reported experiments showing that a relatively large (15 per cent) increase in longitudinal moment of inertia made no noticeable difference in the stability of a standard SE-5A airplane. They point out that G. P. Thomson, "Applied Aeronautics," page 208, stated that an increase in longitudinal moment of inertia would decrease the stability. Neither he nor they make any theoretical forecast of the amount of decrease… more
Date: 1924
Creator: Wilson, Edwin B.
Partner: UNT Libraries Government Documents Department
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Reliable formulae for estimating airplane performance and the effects of changes in weight, wing area, or power

Description: This report contains the derivation and the verification of formulae for predicting the speed range ratio, the initial rate of climb, and the absolute ceiling of an airplane. Curves used in the computation are given in NACA-TR-171. Standard formulae for service ceiling, time of climb, cruising range, and endurance are also given in the conventional forms.
Date: January 1924
Creator: Diehl, Walter S.
Partner: UNT Libraries Government Documents Department
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The Small Angular Oscillations of Airplanes in Steady Flight

Description: "This investigation was carried out by the National Advisory Committee for Aeronautics at the request of the Army Air Service to provide data concerning the small angular oscillations of several types of airplanes in steady flight under various atmospheric conditions. The data are of use in the design of bomb sights and other aircraft instruments. The method used consisted in flying the airplane steadily in one direction for at least one minute, while recording the angle of the airplane with th… more
Date: 1924
Creator: Norton, F. H.
Partner: UNT Libraries Government Documents Department
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The Effect of Slipstream Obstructions on Air Propellers

Description: "The screw propeller on airplanes is usually placed near other objects, and hence its performance may be modified by them. Results of tests on propellers free from slip stream obstructions, both fore and aft, are therefore subject to correction, for the effect of such obstructions and the purpose of the investigation was to determine the effect upon the thrust and torque coefficients and efficiency, for previously tested air propellers, of obstructions placed in the slip stream, it being realiz… more
Date: 1924
Creator: Lesley, E. P. & Woods, B. M.
Partner: UNT Libraries Government Documents Department
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Relative efficiency of direct and geared drive propellers

Description: This report is an extension of NACA-TR-168 and has been prepared for the National Advisory Committee for Aeronautics to show the relative values of various direct and geared drives. It is well known that in general a geared-down propeller has higher efficiency than a direct-drive propeller, but the literature on this subject does not present the data in such form that the aeronautical engineer can readily visualize the effect of gearing. This report has been prepared to show the actual net gain… more
Date: January 1924
Creator: Diehl, Walter S.
Partner: UNT Libraries Government Documents Department
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Revision of the American Pikas (Genus Ochotona)

Description: Discusses distribution, habitat, habits, pelage, molt, specimens, history, and nomenclature of pikas. Provides descriptions, locations, and a key for species and subspecies.
Date: August 21, 1924
Creator: Howell, Arthur H.
Partner: UNT Libraries Government Documents Department
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