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  Partner: UNT Libraries Government Documents Department
 Language: English
 Serial/Series Title: NACA Technical Memorandums
 Collection: Technical Report Archive and Image Library
The transformation of heat in an engine

The transformation of heat in an engine

Date: April 1929
Creator: Neumann, Kurt
Description: This report presents a thermodynamic basis for rating heat engines. The production of work by a heat engine rests on the operation of supplying heat, under favorable conditions, to a working fluid and then taking it away.
Contributing Partner: UNT Libraries Government Documents Department
The boundary layer as a means of controlling the flow of liquids and gases

The boundary layer as a means of controlling the flow of liquids and gases

Date: March 1, 1930
Creator: Schrenk, Oskar
Description: According to one of the main propositions of the boundary layer theory the scarcely noticeable boundary layer may, under certain conditions, have a decisive influence on the form of the external flow by causing it to separate from the wing surface. These phenomena are known to be caused by a kind of stagnation of the boundary layer at the point of separation. The present report deals with similar phenomena. It is important to note that usually the cause (external interference) directly affects only the layer close to the wall, while its indirect effect extends to a large portion of the external flow.
Contributing Partner: UNT Libraries Government Documents Department
Supplement to Comparison of automatic control systems

Supplement to Comparison of automatic control systems

Date: August 1941
Creator: Oppelt, W
Description: This analysis deals with the indirect regulator, wherefrom the behavior of the direct regulator is deduced as a limiting case. The prime mover is looked upon as "independent of the load": a change in the adjusting power (to be applied) for the control link (as, for example, in relation to the adjusting path (eta) with pressure valves or the rudder of vessels) does not modify the actions of the prime mover. Mass forces and friction are discounted; "clearance" also is discounted in the transmission links of the regulator.
Contributing Partner: UNT Libraries Government Documents Department
The critical velocity of a body towed by a cable from an airplane

The critical velocity of a body towed by a cable from an airplane

Date: July 1937
Creator: De Haas, T P & Koning, C
Description: It is sufficient to consider only the equations of motion of the towed body whereas those of the cable may be left out of consideration. The result obtained makes it possible to determine which factors affect the critical velocity and what modifications of the instrument are necessary for extending the upper limit of that velocity.
Contributing Partner: UNT Libraries Government Documents Department
Effect of roughness on properties of airfoils

Effect of roughness on properties of airfoils

Date: August 1926
Creator: Schrenk, O
Description: The first group of a large series of contemplated experiments on the effect of roughness was intended to show the effect of great roughness on airfoils of various sizes and attitudes.
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Lift theory of supporting surfaces : second article

Lift theory of supporting surfaces : second article

Date: September 1921
Creator: Von Mises, R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Handley Page metal construction

Handley Page metal construction

Date: October 1, 1929
Creator: unknown
Description: In this report Handley Page construction techniques are shown such as: solid-drawn tubular duralumin spars are used in the stabilizer; plain channel sections are used extensively for minor components; and the manner of assembling them into a stabilizer compression strut is shown.
Contributing Partner: UNT Libraries Government Documents Department
Experimental investigations concerning the limits of detonation in gaseous mixtures.  Part I

Experimental investigations concerning the limits of detonation in gaseous mixtures. Part I

Date: February 1, 1930
Creator: Wendlandt, Rudolf
Description: It is the purpose of this investigation to determine quantitatively the limits of detonation in gaseous mixtures for the conditions imposed and for a number of given gaseous explosive mixtures.
Contributing Partner: UNT Libraries Government Documents Department
Torsional vibration of aircraft engines

Torsional vibration of aircraft engines

Date: May 1, 1932
Creator: Lurenbaum, Karl
Description: Exhaustive torsional-vibration investigations are required to determine the reliability of aircraft engines. A general outline of the methods used for such investigations and of the theoretical and mechanical means now available for this purpose is given, illustrated by example. True vibration diagrams are usually obtained from vibration measurements on the completed engine. Two devices for this purpose and supplementing each other, the D.V.L. torsiograph and the D.V.L. torsion recorder, are described in this report.
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Rules and regulations governing the Fokker Soaring-Flight Contest over water or level land

Rules and regulations governing the Fokker Soaring-Flight Contest over water or level land

Date: June 1, 1923
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Load assumptions for calculating the strength of airplanes

Load assumptions for calculating the strength of airplanes

Date: September 1, 1930
Creator: unknown
Description: The following load assumptions shall be taken as the basis of the strength calculations. Certain definite load conditions (e.g. of flight, control, landing and transport) shall be assumed. The loads shall be assumed to be safe loads, constant or only slowly variable, and the inertia forces due to elastic deformation are accordingly disregarded. The external forces, the force of gravity and the inertia forces on the whole airplane shall produce a condition of equilibrium.
Contributing Partner: UNT Libraries Government Documents Department
Replacing the weight of materials consumed on airships

Replacing the weight of materials consumed on airships

Date: June 1, 1923
Creator: Crocco, G A
Description: Two methods to replace the weight of gas lost on long airship flights are discussed: condensing the water of combustion and thermic sustentation. In the present article we will discuss the first method, leaving the second to be examined in a subsequent article.
Contributing Partner: UNT Libraries Government Documents Department
Eleventh Rhon soaring-flight contest, 1930

Eleventh Rhon soaring-flight contest, 1930

Date: June 1, 1931
Creator: Georgii, Walter
Description: This report presents the results and a recounting of the new technological developments that were developed for the 11th Rhon Soaring Contest.
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Development of tailless and all-wing gliders and airplanes

Development of tailless and all-wing gliders and airplanes

Date: April 1, 1932
Creator: Lademann, Robert W E
Description: Tailless airplanes are characterized by having all their control surfaces, especially the elevator, incorporated in the wings. This paper provides a discussion of the history of their development and current state of development.
Contributing Partner: UNT Libraries Government Documents Department
Building a full-size glider

Building a full-size glider

Date: September 1, 1927
Creator: Camm, F J
Description: The building and flying of a glider is possible for anyone who can use a few basic tools. This report presents some plans and techniques for building your own glider.
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The vector ruling protractor

The vector ruling protractor

Date: March 1, 1924
Creator: Zahm, A F
Description: The theory, structure and working of a vector slide rule is presented in this report. This instrument is used for determining a vector in magnitude and position when given its components and its moment about a point in their plane.
Contributing Partner: UNT Libraries Government Documents Department
Unsymmetrical forces in an airplane cell

Unsymmetrical forces in an airplane cell

Date: November 1, 1929
Creator: Vogt, R
Description: This paper calls attention to the desirability of expanding airplane building regulations to include proof of safety for cases of unsymmetrical loading, at least in the structural members which are thereby specially stressed.
Contributing Partner: UNT Libraries Government Documents Department
Effects of streamline curvature on lift of biplanes

Effects of streamline curvature on lift of biplanes

Date: June 1, 1927
Creator: Prandtl, L
Description: This report concerns, first, the determination of the lift of a wing which is situated in a curvilinear flow; and second, to calculate the curvature which one wing of a biplane produces in the vicinity of the other.
Contributing Partner: UNT Libraries Government Documents Department
Ultra-light alloys and their utilization on aircraft

Ultra-light alloys and their utilization on aircraft

Date: May 1, 1924
Creator: Defleury, R & Portevin, A M
Description: We will arbitrarily call alloys having a specific gravity of less than 2 "ultra-light", in order to distinguish them from "light" alloys with a specific gravity of 2 to 3. Thus far it has been possible to make ultra-light alloys only by employing a large proportion of magnesium.
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A study of curvilinear flight

A study of curvilinear flight

Date: April 1, 1931
Creator: Kruse, Helmuth
Description: When an airplane describes a curve it takes a certain time for it to turn from level to inclined position and then back to level again. In the following, we express the motion about the horizontal axis as "roll" or "bank" and the motion perpendicular to the vertical axis, i.e., the actual curve, as "turn." Equations and tables provide results on various aspects of turns, control settings, acceleration, inertia moments, and angular velocity.
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Force measurements on airplanes

Force measurements on airplanes

Date: June 1, 1929
Creator: Seewald, F
Description: The most essential phenomena of aircraft should be classified according to their origin and then measured. Information can thus be obtained in a quicker, cheaper, and more reliable way than otherwise would be possible.
Contributing Partner: UNT Libraries Government Documents Department
Contribution to the study of normal burning in gaseous carbureted mixtures. Part I

Contribution to the study of normal burning in gaseous carbureted mixtures. Part I

Date: January 1, 1930
Creator: Duchene, M R
Description: In the present study it is proposed to provide an equipment permitting the study of the propagation of the region of reaction in mixtures of air and carbureted gases enclosed within a cylinder. Ignition is produced at the end of compression by an electric spark. With this apparatus it is proposed to determine: 1) the influence of the richness of the explosive mixture on the rate of flame propagation; 2) the influence of the degree of volumetric compression on one of the hydrocarbons; 3) the influence of the variation of initial temperature of the mixture before compression; 4) the influence of tetraethyl-lead on the propagation - notably on the formation of the explosive wave.
Contributing Partner: UNT Libraries Government Documents Department
Spatial buckling of various types of airplane strut systems

Spatial buckling of various types of airplane strut systems

Date: November 1, 1931
Creator: Teichmann, Alfred
Description: Equations are presented for two and three dimensional strut systems along with tables of equations.
Contributing Partner: UNT Libraries Government Documents Department
Correction of downwash in wind tunnels of circular and elliptic sections

Correction of downwash in wind tunnels of circular and elliptic sections

Date: July 1, 1936
Creator: Lotz, Irmgard
Description: The downwash velocity distribution behind the wing was determined for the free jet and for the closed tunnel of both circular and elliptic cross sections. The wing was placed at the center of the tunnel. The theory makes it possible to determine the downwash at any point in the jet. The computations were performed for points in the plane determined by the jet axis and the center-of-pressure line of the wing. The downwash proved to be proportional to the wing lift and inversely proportional to the cross-sectional area of the tunnel.
Contributing Partner: UNT Libraries Government Documents Department
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