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 Collection: National Advisory Committee for Aeronautics Collection
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
Study of chromium-frit-type coatings for high-temperature protection of molybdenum

Study of chromium-frit-type coatings for high-temperature protection of molybdenum

Date: July 1, 1951
Creator: Moore, D G
Description: The achievement of more compact and efficient power plants for aircraft is dependent, among other factors, on the perfection of heat-resisting materials that are superior to those in current use. Molybdenum is one of the high-melting metals (melting point, 4750 F). It is fairly abundant and also can be worked into many of the shapes required in modern power plants. To permit its widespread use at elevated temperatures, however, some means must first be found to prevent its rapid oxidation. The application of a protective coating is one method that might be used to achieve this goal. In the present work, a number of chromium-frit-type coatings were studied. These were bonded to molybdenum specimens by firing in controlled atmospheres to temperatures in the range of 2400 to 2700 F.
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
Experimental investigation of laminar-boundary-layer control on an airfoil section equipped with suction slots located at discontinuities in the surface pressure distribution

Experimental investigation of laminar-boundary-layer control on an airfoil section equipped with suction slots located at discontinuities in the surface pressure distribution

Date: December 15, 1953
Creator: Horton, E. A.
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Experimental investigation of effects of simulated nacelles and wing-root freedoms on supersonic flutter characteristics of a cambered, modified, swept, tapered wing

Experimental investigation of effects of simulated nacelles and wing-root freedoms on supersonic flutter characteristics of a cambered, modified, swept, tapered wing

Date: October 16, 1957
Creator: Hanson, P. W.
Description: None
Contributing Partner: UNT Libraries Government Documents Department