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Propeller Scale Effect and Body Interference

Description: "This note shows that the main part of the discrepancy between full flight propeller performance and the performance of models in a wind tunnel is due to a scale effect, and that a minor part is caused by body interference. Analyses are made of propeller performances on several standard airplanes, and the actual brake horsepower compared with the power as calculated from model test data. The calculated power is based on that absorbed by a wind tunnel propeller model which is geometrically simil… more
Date: September 1925
Creator: Weick, Fred E.
Partner: UNT Libraries Government Documents Department
open access

Wind Tunnel Tests of Fuselages and Windshields

Description: "The tests described herein were made in 1918, in the old four-foot wind tunnel at the Massachusetts Institute of Technology and at the request of the Engineering Division of the U.S. Army Air Service. The results were given circulation only in official circles at that time. The interest of the work appears sufficient to justify its wider distribution even at this very late date" (p. 1).
Date: September 1925
Creator: Warner, Edward P.
Partner: UNT Libraries Government Documents Department
open access

Determination and Classification of the Aerodynamic Properties of Wing Sections

Description: The following note, prepared for the NACA, contains several remarks on the possible improvement of the experimental determination of the aerodynamic properties of wing sections. It shows how errors of observation can subsequently be partially eliminated, and how the computation of the maxima or minima of aerodynamic characteristics can be much improved.
Date: September 1925
Creator: Munk, Max M.
Partner: UNT Libraries Government Documents Department
open access

Preliminary Report on British Commercial Aeronautics

Description: This report briefly recounts the history of British commercial aviation and then goes on to look at the equipment, governmental relations, operations, and air traffic.
Date: September 1925
Creator: Van Zandt, J. Parker
Partner: UNT Libraries Government Documents Department
open access

Atomization of Liquid Fuels Part 1: Relation Between Atomization and Combustion, Methods Employed for Determining the Size of Particles and Small Drops, Choice of Experimental Method

Description: In the present treatise we will consider chiefly the problem of solid injection in comparison with air injection. On leaving the valve or nozzle through one or more small openings, the fuel is split up into innumerable fine drops, which penetrate the combustion chamber in divergent directions in the form of a conical jet. The efficiency of this jet is judged from the following three viewpoints: 1) with respect to the fineness of atomization; 2) with respect to the direction or distribution of s… more
Date: September 1925
Creator: Kuehn
Partner: UNT Libraries Government Documents Department
open access

Atomization of Liquid Fuels Part 2: Description of Apparatus, Fuels Tested, Atomization Experiments, Discharge Measurements, Atomization

Description: This report describes the design and operation of a nozzle to inject fuel into an engine. The design of the nozzle is open, without any compulsory or automatic stop-valve. The fuel injection is regulated simply by the pressure and the adjustment of the fuel pump.
Date: September 1925
Creator: Kuehn, R.
Partner: UNT Libraries Government Documents Department
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