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 Serial/Series Title: NACA Technical Memorandums
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 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
The New Interpretation of the Laws of Air Resistance

The New Interpretation of the Laws of Air Resistance

Date: April 1, 1923
Creator: Prandtl, L
Description: A closer examination of Newton's formula for air resistance shows that it is well to consider the air as an ordinary fluid, and, indeed for most of the velocities considered, as a non-compressible fluid, so long as the dimensions of the moving body are large in comparison with the mean free path of the particles of air.
Contributing Partner: UNT Libraries Government Documents Department
Seaplanes for commerce

Seaplanes for commerce

Date: March 1, 1923
Creator: Warner, Edward P
Description: The advantages of using seaplanes for commercial purposes is discussed.
Contributing Partner: UNT Libraries Government Documents Department
Calculation of the pressures on aircraft engine bearings

Calculation of the pressures on aircraft engine bearings

Date: December 1, 1929
Creator: Steigenberger, O
Description: For aircraft engines the three principal operating conditions are idling speed, cruising speed, and diving with the engine stopped. In what follows, we will discuss a method which affords a good idea of the course of pressure for the above mentioned operating conditions. The pressures produced in the driving gear are of three kinds; namely, the pressure due to gases, the pressure due to the inertia of the rotating masses, and the pressure due to the inertia of the reciprocating masses.
Contributing Partner: UNT Libraries Government Documents Department
Turbulent flow

Turbulent flow

Date: October 1, 1927
Creator: Prandtl, L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
English airplane construction

English airplane construction

Date: December 1, 1930
Creator: Schwencke, D
Description: English airplane construction is presented with a particular emphasis on metal construction techniques. Steel rib and fuselage construction are discussed as well as the use of duralumin in construction.
Contributing Partner: UNT Libraries Government Documents Department
Application of the theory of free jets

Application of the theory of free jets

Date: April 1, 1932
Creator: Betz, A & Petersohn, E
Description: Based upon Kirchoff's theory of free jets the flow through different screen arrangements of flat plates, as chiefly encountered with turbines in the cavitation zone is defined. It is shown by experiments that these theoretical results are very well representative in most cases of the conditions of discharge from water in air and consequently by cavitation. In addition, the experiments reveal a picture of the discrepancies between the actual flow and the theory of discharge of air in air (of water in water without cavitation). These discrepancies are explained qualitatively by the mingling processes between the jets and the dead air zones.
Contributing Partner: UNT Libraries Government Documents Department
Technical Section of Aeronautics

Technical Section of Aeronautics

Date: February 1, 1923
Creator: Lesage, Andre
Description: The duties of the Technical Section are listed along with facilities for testing. Different categories of tests are discussed and some sample results included.
Contributing Partner: UNT Libraries Government Documents Department
Effect of viscosity in speed measurements with double-throat Venturi tubes

Effect of viscosity in speed measurements with double-throat Venturi tubes

Date: August 1, 1931
Creator: Peters, H
Description: In order to clarify the viscosity effect some experiments were made in the Gottigen low-pressure tunnel with the Bruhn double-throat Venturi tube. This type of tunnel makes it possible to vary the pressure and thereby the density within wide limits and consequently, to examine the viscosity effect. This, however, did not impair the results because pressure and temperature were determined at different periods.
Contributing Partner: UNT Libraries Government Documents Department
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