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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
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 transformation of heat in an engine

The transformation of heat in an engine

Date: April 1, 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
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 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
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
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
Engines and fuels

Engines and fuels

Date: August 1, 1923
Creator: unknown
Description: The report considers the effect on engines of the varying types of fuels now in use. Different types of fuels are examined and the influence of physical characteristics are considered.
Contributing Partner: UNT Libraries Government Documents Department
Aviation spirit - past, present, and future

Aviation spirit - past, present, and future

Date: September 1, 1923
Creator: Dunstan, A E & Thole, F B
Description: The volatile fuel of the high-speed internal combustion engine has, in the past, consisted almost exclusively of the lighter distillates from crude petroleum. Alternative and supplementary fuels are discussed such as: tetraline, dekalin, alcohol, cyclo-hexenes.
Contributing Partner: UNT Libraries Government Documents Department
Lautal as a material for airplane construction

Lautal as a material for airplane construction

Date: August 1, 1929
Creator: Brenner, Paul
Description: Lautal is a refinable aluminum alloy which, unlike duralumin, contains no magnesium. According to the statements of the Lauta Works, lautal contains: aluminum, 94%; copper, 4%; silicon, 2%. The use of lautal as a construction material is discussed in relation to specific weight, production methods, and riveting tests.
Contributing Partner: UNT Libraries Government Documents Department
Mechanical control of airplanes

Mechanical control of airplanes

Date: March 1, 1929
Creator: Boykow, H
Description: Before undertaking a detailed description of an automatic-control mechanism, I will state briefly the fundamental conditions for such devices. These are: 1) it must be sensitive at one or more reference values; 2) it must stop the angular motions of the airplane not produced by the pilot; and 3) it must be possible to switch it off and on by a simple hand lever.
Contributing Partner: UNT Libraries Government Documents Department
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