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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
Lift theory of supporting surfaces : second article

Lift theory of supporting surfaces : second article

Date: September 1, 1921
Creator: Von Mises, R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effect of roughness on properties of airfoils

Effect of roughness on properties of airfoils

Date: August 1, 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.
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 1, 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
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
Supplement to Comparison of automatic control systems

Supplement to Comparison of automatic control systems

Date: August 1, 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 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
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.
Contributing Partner: UNT Libraries Government Documents Department
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
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