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Study of Open Jet Wind Tunnel Cones

Description: "Tests have been made by the National Advisory Committee for Aeronautics on the air flow in an open jet wind tunnel with various sizes, shapes, and spacings of cones, and the flow studied by means of velocity and direction surveys in conjunction with flow pictures. It was found that for all combinations of cones tested the flow is essentially the same, consisting of an inner core of decreasing diameter having uniform velocity and direction, and a boundary layer of more or less turbulent air inc… more
Date: August 1927
Creator: Weick, Fred E.
Partner: UNT Libraries Government Documents Department
open access

Wall interference in closed type wind tunnels

Description: "A series of tests has been conducted by the National Advisory Committee for Aeronautics, in the variable density wind tunnel on several airfoils of different sizes and sections to determine the effect of tunnel wall interference and to determine a correction which can be applied to reduce the error caused thereby. The use of several empirical corrections was attempted with little success. The Prandtl theoretical correction gives the best results and its use is recommended for correcting closed… more
Date: March 1927
Creator: Higgins, George J.
Partner: UNT Libraries Government Documents Department
open access

Tension experiments on diaphragm metals

Description: Strips of german silver, steel, copper, duralumin, nickel and brass were tested in tension in an apparatus in which the change in deflection with time was measured by means of an interferometer. This change in deflection with time caused by the application and removal of a load is defined as "drift" and "recovery," respectively. It was measured in the time interval from approximately 5 seconds to 5 hours after loading. The data are given in a series of graphs in which the drift and recovery are… more
Date: August 1927
Creator: Henrickson, H. B.
Partner: UNT Libraries Government Documents Department
open access

The Installation and Correction of Compasses in Airplanes

Description: "The saving of time that results from flying across country on compass headings is beginning to be widely recognized. At the same time the general use of steel tube fuselages has made a knowledge of compass correction much more necessary than was the case when wooden fuselages were the rule. This paper has been prepared primarily for the benefit of the pilot who has never studied navigation and who does not desire to go into the subject more deeply than to be able to fly compass courses with co… more
Date: August 1927
Creator: Schoeffel, M. F.
Partner: UNT Libraries Government Documents Department
open access

A load factor formula

Description: The ultimate test of a load factor formula is experience. The chief advantages of a semi rational formula over arbitrary factors are that it fairs in between points of experience and it differentiates according to variables within a type. Structural failure of an airplane apparently safe according to the formula would call for a specific change in the formula. The best class of airplanes with which to check a load factor formula seems to be those which have experienced structural failure. Table… more
Date: August 1927
Creator: Miller, Roy G.
Partner: UNT Libraries Government Documents Department
open access

Pressure distribution on wing ribs of the VE-7 and TS airplanes in flight

Description: This paper is the first of a series of notes, each of which presents the complete results of pressure distribution tests made by the National Advisory Committee for Aeronautics, on single-wing ribs of the VE-7 and TS airplanes for a particular condition of flight. The level flight results are presented here in the form of curves and show the comparison between the pressure distribution over a representative thin wing, R.A.F.-15, and a moderately thick wing, U.S.A.-27, throughout the range of an… more
Date: October 1927
Creator: Rhode, R. V.
Partner: UNT Libraries Government Documents Department
open access

Mass distribution and performance of free flight models

Description: This note deals with the mass distribution and performance of free flight models. An airplane model which is to be used in free flight tests must be balanced dynamically as well as statically, e.g., it must not only have a given weight and the proper center of gravity but also a given ellipsoid of inertia. Equations which relate the motions of an airplane and its model are given. Neglecting scale effect, these equations may be used to predict the performance of an airplane, under the action of … more
Date: October 1927
Creator: Scherberg, Max & Rhode, R. V.
Partner: UNT Libraries Government Documents Department
open access

The Distribution of Loads Between the Wings of a Biplane Having Decalage

Description: "It is known that in a biplane the load is not distributed equally between the wings. The presence of one wing will affect the lift characteristics of the other wings. A designer must know the total load that each wing carries in order that he may design an adequate structure. The purpose here is to determine the distribution of loads between the wings of a biplane at various angles of decalage, when the gap/chord ratio is one, and there is no stagger" (p. 1).
Date: November 1927
Creator: Mock, Richard M.
Partner: UNT Libraries Government Documents Department
open access

Technical Preparation of the Airplane "Spirit of St. Louis"

Description: Given here is a brief history of the design and construction of the "Spirit of St. Lewis", the airplane that Charles Lindbergh flew solo across the Atlantic. Although the plan was to modify a standard model Ryan M-2, it was quickly determined that modification was less practical than redesign. Given here are the general dimensions, specifications, weight characteristics, and man hours required to build the aircraft.
Date: July 1927
Creator: Hall, Donald A.
Partner: UNT Libraries Government Documents Department
open access

A warning concerning the take-off with heavy load

Description: "A successful take-off can be made with an airplane so heavily loaded that it cannot climb to a height greater than the span of its wings. The explanation is that the power required to maintain level flight at an altitude of the order of the wing span may be as much as 50 per cent greater than that necessary when the airplane is just clear of the ground. The failure of heavily loaded airplanes to continue climbing at the rate attained immediately after the actual take-off is a grave hazard and … more
Date: July 1927
Creator: Reid, Elliott G. & Carroll, Thomas
Partner: UNT Libraries Government Documents Department
open access

"A L C L A D": A New Corrosion Resistant Aluminum Product

Description: Described here is a new corrosion resistant aluminum product which is markedly superior to the present strong alloys. Alclad is a heat-treated aluminum, copper, manganese, magnesium alloy that has the corrosion resistance of pure metal at the surface and the strength of the strong alloy underneath. Of particular importance is the thorough character of the union between the alloy and the pure aluminum.
Date: August 1927
Creator: Dix, E. H., Jr.
Partner: UNT Libraries Government Documents Department
open access

Airfoil lift with changing angle of attack

Description: From Summary: "Tests have been made in the atmospheric wind tunnel of the National Advisory Committee for Aeronautics to determine the effects of pitching oscillations upon the lift of an airfoil. It has been found that the lift of an airfoil, while pitching, is usually less than that which would exist at the same angle of attack in the stationary condition, although exceptions may occur when the lift is small or if the angle of attack is being rapidly reduced. It is also shown that the behavio… more
Date: September 1927
Creator: Reid, Elliott G.
Partner: UNT Libraries Government Documents Department
open access

Method of correcting wind tunnel data for omitted parts of airplane models

Description: Wind tunnel models do not have complete similarity to the full scale airplane. Part of the dissimilarity is due to the difference between the stationary model in the artificial wind stream of the tunnel and the moving airplane in still air. There are a number of other reasons for departing from exact geometrical similitude. For reasons of accuracy and economy, all minor parts of the full scale airplane, such as struts, wires, fittings, control horns and other parts whose scale corrections are l… more
Date: January 1927
Creator: Smith, R. H.
Partner: UNT Libraries Government Documents Department
open access

Measurement of the Moments of Inertia of Full Scale Airplanes

Description: "This paper contains a description of the method of measuring the moments of inertia of full scale airplanes as practiced by the National Advisory Committee for Aeronautics at the Langley Memorial Aeronautical Laboratory. The method, while not at all new, is published for the information and guidance of others who may desire to make similar measurements. The paper includes as an appendix the computations for the moments of inertia of 0-2 airplane" (p. 1).
Date: September 1927
Creator: Green, M. W.
Partner: UNT Libraries Government Documents Department
open access

Precision of Wing Sections and Consequent Aerodynamic Effects

Description: Note presenting an investigation to determine the precision of wing sections of wood fabric construction used on a number of airplanes. All of the wing sections were found to deviate more or less from their respective prototypes. The aerodynamic effects resulting from consideration of thickness variation are then estimated from existing empirical information.
Date: January 1927
Creator: Rizzo, Frank
Partner: UNT Libraries Government Documents Department
open access

The Characteristics of the N.A.C.A 97, Clark Y, and N.A.C.A. M6 Airfoils with Particular Reference to the Angle of Attack

Description: Report examining the aerodynamic characteristics of three airfoil sections as determined in the variable density wind tunnel. Particular attention is given to the relation of the characteristics to the angle of attack and their use in airplane design.
Date: December 1927
Creator: Higgins, George J.
Partner: UNT Libraries Government Documents Department
open access

Tests of the N.P.L. airship models in the variable density wind tunnel

Description: Report presenting testing in the variable density wind tunnel on two airship models known as the NPL Standardization Models, long and short. The resistance or shape coefficients were determined for each model through a range of Reynolds numbers. Further work is found to be necessary in the standardization of wind tunnels.
Date: September 1927
Creator: Higgins, George J.
Partner: UNT Libraries Government Documents Department
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