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High altitude flying

Description: This note investigates the effect of high altitude or low atmospheric pressure upon the operation of an engine and the effect of the low pressure and lack of oxygen and of the very low temperatures upon the pilot and upon the performance of the airplane itself.
Date: May 1, 1924
Creator: King, Paul B & Carroll, Thomas
Partner: UNT Libraries Government Documents Department

Interference of multiplane wings having elliptical lift distribution

Description: In calculating the self-induction of a wing surface, elliptical lift distribution is assumed, while in calculating the mutual induction or interference of two wing surfaces, a uniform distribution of the lift along the wing has hitherto been assumed. Whether the results of these calculations are substantially altered by assuming an elliptical lift distribution (which is just as probable as uniform distribution) is examined here.
Date: February 1924
Creator: von Sanden, H.
Partner: UNT Libraries Government Documents Department

The influence of the form of a wooden beam on its stiffness and strength I : deflection of beams with special reference to shear deformations

Description: The purpose of this investigation was to determine to what extent ordinary deflection formulas, which neglect shear deformations, are in error when applied to beams of various sections, and to develop reasonably accurate yet comparatively simple formulas which take into account such deformations. A great many tests were made to determine the amount of shear deformation for beams of various sections tested over many different spans. As the span over which the beam is tested is increased the error introduced by neglecting shear deformations becomes less, and the values obtained by substituting measured deflections in the ordinary formulas approach more nearly the modulus of elasticity in tension and compression. For short spans the error is considerable and increases rapidly as the span is reduced. Two formulas were developed for estimating the magnitude of shear deformations, both of which have been verified by tests. The first assumes the parabolic distribution of shear on a cross section of a beam and, starting with a differential volume, the distortion due to shear is determined by the ordinary methods of summarizing the work. The second assumes that the deflections due to shear in any two beams of the same length, height, and moment of inertia, which are similarly loaded, are proportional to the summations of the shear stresses on their respective vertical sections. Both formulas check experimental results very closely when the calculations are made with great refinement.
Date: January 1, 1924
Creator: Newlin, J A & Trayer, G W
Partner: UNT Libraries Government Documents Department

The influence of the form of a wooden beam on its stiffness and strength II : form factors of beams subjected to transverse loading only

Description: The general aim of the investigation described in this report is the achievement of efficient design in wing beams. The purpose of the tests was to determine factors to apply to the usual beam formula in order that the properties of wood based on tests of rectangular sections might be used as a basis of design for beams of any sections and if practical to develop formulas for determining such factors and to verify them by experiment. Such factors for various sections have been determined from test by comparing properties of the beam in question to similar properties of matched beams 2 by 2 inches in section. Furthermore, formulas were worked out, more or less empirical in character, which check all of these test values remarkably well.
Date: January 1, 1924
Creator: Newlin, J A & Trayer, G W
Partner: UNT Libraries Government Documents Department

A method for the instantaneous determination of the velocity and direction of the wind

Description: The laboratory instruments, which we often constructed with makeshift means, gave encouraging results and showed that they could satisfactorily meet the required conditions. By limiting ourselves to the employment of hot wires of 0.05 mm (0.002 in.) diameter, we obtained instruments which faithfully followed all the wind fluctuations of over 0.1 second and even much more rapid variations without any very great error.
Date: June 1, 1924
Creator: Huguenard, E; Magnan, A & Planiol, A
Partner: UNT Libraries Government Documents Department

Nomenclature for Aeronautics

Description: This nomenclature for aeronautics was prepared by a special conference on aeronautical nomenclature by the Executive Committee of the National Advisory Committee for Aeronautics at a meeting held August 11, 1933. This publication supersedes all previous publications of the committee on this subject. The purpose of the committee in the preparation and publication of this report is to secure uniformity in the official documents of the government and, as far as possible, in technical and other commercial publications.
Date: January 1, 1924
Partner: UNT Libraries Government Documents Department

Nomogram for correcting drag and angle of attack of an airfoil model in an air stream of finite diameter

Description: In experimenting with airfoil models in a wind tunnel, the magnitude of the forces acting on the model is affected by the fact that the air stream in which the model is suspended, has a restricted cross-section. In order to utilize the results for an airplane in an unlimited quantity of air, a correction must be made. The magnitude of this correction was determined by Prandtl by the application of his wing theory.
Date: December 1924
Partner: UNT Libraries Government Documents Department

New application of principle of variable-camber airfoil : Lachassagne system

Description: In studying the application of his system of varying the camber of airfoil sections, Mr. Lachassagne has just obtained a series of airfoil sections whose polar envelope presents truly remarkable aerodynamic properties.
Date: April 1, 1924
Creator: Toussaint, A
Partner: UNT Libraries Government Documents Department

The problem of liquid fuels (for aircraft engines)

Description: The crisis which troubles the world market for liquid fuel in general and for carburants in particular is doubtless one of the most serious ever experienced by modern industry. It is a national crisis of economic and political independence for countries like Italy and France. The solutions suggested for meeting the lack of liquid fuel may be summed up under two general headings: the economical use of the petroleum now available; creation of petroleum substitutes from natural sources within the country. The process of cracking is described at length.
Date: July 1, 1924
Creator: Gallo, Gino
Partner: UNT Libraries Government Documents Department

Loss of the Dixmude

Description: The causes of the destruction of the Dixmude are discussed and some conclusions are drawn. The author believes a gasoline fire instead of a lightning strike was probably responsible, but the public believes otherwise.
Date: April 1, 1924
Creator: Eckener, Hugo
Partner: UNT Libraries Government Documents Department

Longitudinal oscillation of an airplane Part 1: problem and method

Description: Report presenting some theoretical calculations for determining the problems of accelerated and disturbed motion, phenomena in an accidental or intentional disturbance through the deflection of the rudder or elevator, or any other change in the conditions of flight.
Date: April 1924
Creator: Fuchs, R. & Hopf, L.
Partner: UNT Libraries Government Documents Department

The logarithmic polar curve-it's theory and application to the predetermination of airplane performance

Description: The logarithmic polar curve has for several years been used by the most prominent aerodynamical laboratories as well as by airplane manufacturers in Europe. To show more clearly the practical application of the polar curve, a series of examples are given with suggestions for solution. After a discussion of the theory and the practical application of the polar curve, the following problems are discussed: climbing flight, speed at various altitudes, and the characteristics of two seater observation airplanes of recent design.
Date: October 1, 1924
Creator: Cronstedt, Val
Partner: UNT Libraries Government Documents Department

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 by the method of small oscillations is in general 40 per cent higher than the damping in flight. At 50 M. P. H. The flight curve of L sub P has a high peak, which is not indicated in the model results. It is also shown that at this speed the lateral maneuverability is low.
Date: January 1, 1924
Creator: Norton, F. H.
Partner: UNT Libraries Government Documents Department

Note on the relative effect of the dihedral and the sweep back of airplane wings

Description: Dihedral and sweep back can properly be compared only to the extent to which their action is similar in a side slip. In general the rolling moments due to side slip are about three to six times greater for a given dihedral angle than for an equal angle of sweep back.
Date: January 1, 1924
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department

Note on vortices on their relation to the lift of airfoils

Description: This note, prepared for the NACA, contains a discussion of the meaning of vortices, so often mentioned in connection with the creation of lift by wings. The action of wings can be more easily understood without the use of vortices.
Date: March 1, 1924
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department

Effect of changing the mean camber of an airfoil section

Description: Methodical experiments with the series of airfoil sections of the same relative thickness and of variable relative cambers can be utilized for determining the effect of the camber on the aerodynamic properties of airfoil sections.
Date: March 1, 1924
Creator: Toussaint, A.
Partner: UNT Libraries Government Documents Department

Duralumin, its properties and uses

Description: A historical sketch of duralumin is presented, especially in regards to its manufacture by various countries. The properties of duralumin are discussed and strength characteristics listed. Increasing the hardness of duralumin by tempering is discussed as well as the uses of the metal.
Date: October 1, 1924
Creator: Beck, R
Partner: UNT Libraries Government Documents Department

Airplanes in horizontal curvilinear flight

Description: The report discussing single and two-seater airplanes as well as larger airplanes.
Date: January 1924
Creator: Kann, Heinrich
Partner: UNT Libraries Government Documents Department

Air transport

Description: I purpose (sic) in this paper to deal with the development in air transport which has taken place since civil aviation between England and the Continent first started at the end of August 1919. A great deal of attention has been paid in the press to air services of the future, to the detriment of the consideration of results obtained up to the present.
Date: January 1, 1924
Creator: Page, F Handley
Partner: UNT Libraries Government Documents Department

Air-flow experiments

Description: This report describes the apparatus used to take air-flow photographs. The photographs show chiefly the spiral course of the lines of flow near the tip of the wing. They constitute therefore a visual presentation of the phenomena covered by airfoil theory.
Date: May 1924
Creator: Wieselsberger, C
Partner: UNT Libraries Government Documents Department