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 Serial/Series Title: NACA Technical Memorandums
 Collection: Technical Report Archive and Image Library
On the elementary relation between pitch, slip, and propulsive efficiency

On the elementary relation between pitch, slip, and propulsive efficiency

Date: July 1, 1920
Creator: Froude, W
Description: The author examines the current theory on the importance of reducing slip in airplane propellers. The author feels an exaggerated importance is attached to this supposition and feels that the increase in friction by an increase in propeller area or number of revolutions can't be discounted.
Contributing Partner: UNT Libraries Government Documents Department
Recent developments in light alloys

Recent developments in light alloys

Date: November 1, 1920
Creator: Woodward, R W
Description: This report is intended to cover the progress that has been made in both the manufacture and utility of light alloys in the United States since the first part of 1919. Duralumin is extensively discussed both as to manufacture and durability.
Contributing Partner: UNT Libraries Government Documents Department
Tests of artificial flight at high altitudes

Tests of artificial flight at high altitudes

Date: November 1, 1920
Creator: Gradenwitz, Arthur
Description: If we wish to form an accurate idea of the extraordinary progress achieved in aeronautics, a comparison must be made of the latest altitude records and the figures regarded as highest attainable limit some ten years ago. It is desirable, for two reasons, that we should be able to define the limit of the altitudes that can be reached without artificial aid. First, to know to what extent the human body can endure the inhalation of rarified air. Second, the mental capacity of the aviator must be tested at high altitudes and the limit known below which he is able to make reliable observations without being artificially supplied with oxygen. A pneumatic chamber was used for the most accurate observations.
Contributing Partner: UNT Libraries Government Documents Department
Variable pitch propellers

Variable pitch propellers

Date: November 1, 1920
Creator: unknown
Description: In this report are described four different types of propellers which appeared at widely separated dates, but which were exhibited together at the last Salon de l'Aeronautique. The four propellers are the Chaviere variable pitch propeller, the variable pitch propeller used on the Clement Bayard dirigible, the variable pitch propeller used on Italian dirigibles, and the Levasseur variable pitch propeller.
Contributing Partner: UNT Libraries Government Documents Department
Dependence of propeller efficiency on angle of attack of propeller blade

Dependence of propeller efficiency on angle of attack of propeller blade

Date: January 1, 1921
Creator: Borck, Hermann
Description: In order to determine the maximum and the most favorable pitch for a propeller, it was found desirable to investigate the dependence of propeller efficiency on the angle of attack of the propeller blade. The results of a few experiments are given to show that propeller blades conduct themselves just like airplane wings with reference to the dependence of their efficiency on their angle of attack.
Contributing Partner: UNT Libraries Government Documents Department
The Oehmichen Peugeot helicopter

The Oehmichen Peugeot helicopter

Date: January 1, 1921
Creator: unknown
Description: The first flights of the Oehmichen helicopter are detailed as well as various aspects of the construction.
Contributing Partner: UNT Libraries Government Documents Department
Study of the resistance offered by propellers rotating on an airstream

Study of the resistance offered by propellers rotating on an airstream

Date: January 1, 1921
Creator: Lame, M
Description: This report presents a series of tests conducted to verify the formula for thrust P = q(exp 2) D(exp 2) V(exp 2), where P represents thrust, V the velocity of the airstream, D the diameter of the propeller, and q the lifting quality of a comparative propeller which is called the conjugate propeller.
Contributing Partner: UNT Libraries Government Documents Department
Commercial aviation in Germany : past and future

Commercial aviation in Germany : past and future

Date: February 1, 1921
Creator: Wronsky, W
Description: This review of commercial aviation includes postal delivery, package transport, and passenger transport. Both airplanes and airships are covered in this review.
Contributing Partner: UNT Libraries Government Documents Department
Abacus giving the variation of the mean pressure of an aviation engine as a function of its speed of rotation

Abacus giving the variation of the mean pressure of an aviation engine as a function of its speed of rotation

Date: March 1, 1921
Creator: Margoulis, W
Description: Comparing the results of the calculations for computing the mean pressure of an aviation engine for any number of revolutions, with those of experiment, the writer, by numerous examples, shows the perfect agreement between them. This report will show that, by means of a special abacus, an engineer can instantly plot the characteristics of an engine.
Contributing Partner: UNT Libraries Government Documents Department
Analytical methods for computing the polar curves of airplanes

Analytical methods for computing the polar curves of airplanes

Date: March 1, 1921
Creator: LE SUEUR
Description: This report presents a method of calculating polar curves which is at least as precise as graphical methods, but it more rapid. Knowing the wind tunnel test of a wing and the performances of an airplane of the same profile, it is easy to verify the characteristic coefficients and, at the same time, the methods determining induced resistances.
Contributing Partner: UNT Libraries Government Documents Department
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