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  Partner: UNT Libraries Government Documents Department
 Serial/Series Title: NACA Technical Memorandums
 Collection: National Advisory Committee for Aeronautics Collection
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
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
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
Moments of cambered round bodies

Moments of cambered round bodies

Date: August 1, 1949
Creator: Kempf, Gunther
Description: Results are presented for the moments and position of force centers of a series of cambered round bodies derived from a torpedo-like body of revolution. The effects of placing fins on the rear of the body of revolution are also included.
Contributing Partner: UNT Libraries Government Documents Department
The coupling of engines

The coupling of engines

Date: April 1, 1921
Creator: Boccaccio, Paul
Description: This report examines the idea of coupling numerous engines together to turn a single propeller, which the author feels would free aircraft design from the problems of multi-engine and propeller design.
Contributing Partner: UNT Libraries Government Documents Department
The Goebel rotary engine

The Goebel rotary engine

Date: March 1, 1921
Creator: unknown
Description: This report presents a table of specifications of the rotary engine and a very brief description of some of the notable features such as the exhaust valves controlled by means of a fixed cam gear.
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
The law relating to air currents

The law relating to air currents

Date: March 1, 1921
Creator: unknown
Description: In the subdivided wing section profile, the diagram of the current is entirely changed and the harmful formation of eddies is avoided through premature deflection. Pressure equalization does not occur between the upper and under sides. This report presents a discussion of the various laws relating to wing design with the conclusion being that lift increases with more acute angles of attack.
Contributing Partner: UNT Libraries Government Documents Department
Pressure Distribution on Joukowski Wings

Pressure Distribution on Joukowski Wings

Date: December 1, 1979
Creator: Blumenthal, O.
Description: The hydrodynamics and mathematical models as applied to the potential flow about a Joukowski wing are presented.
Contributing Partner: UNT Libraries Government Documents Department
The dynamometer hub and the flywheel of the engine

The dynamometer hub and the flywheel of the engine

Date: June 1, 1921
Creator: Everling, E
Description: None
Contributing Partner: UNT Libraries Government Documents Department