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Variable Pitch Propellers

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.
Date: November 1920
Creator: Bacon, D. L.
Partner: UNT Libraries Government Documents Department
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Recent Developments in Light Alloys

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.
Date: November 1920
Creator: Woodward, R. W.
Partner: UNT Libraries Government Documents Department
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Tests of Artificial Flight at High Altitudes

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 … more
Date: November 1920
Creator: Gradenwitz, Arthur
Partner: UNT Libraries Government Documents Department
open access

On the Elementary Relation Between Pitch, Slip, and Propulsive Efficiency

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.
Date: 1920
Creator: Froude, W.
Partner: UNT Libraries Government Documents Department
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