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 Collection: Technical Report Archive and Image Library
Results 15251 - 15260 of 17,147
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Identification of Aircraft Tubing by Rockwell Test

Identification of Aircraft Tubing by Rockwell Test

Date: June 1, 1930
Creator: Knerr, Horace C.
Description: Seamless steel tubing is today the principal material of construction for aircraft. The commercial grade of tubing containing about 0.10 to 0.20% carbon at first used is being superseded by two grades which are approved by the army and navy, and which are also becoming standard for commercial airplanes.
Contributing Partner: UNT Libraries Government Documents Department
The "Junkers-Junior" Light Airplane (German) : A Two-Seat All-Metal Low-Wing Cantilever Monoplane

The "Junkers-Junior" Light Airplane (German) : A Two-Seat All-Metal Low-Wing Cantilever Monoplane

Date: June 1, 1930
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Performance of a high-speed compression-ignition engine using multiple orifice fuel injection nozzles

Performance of a high-speed compression-ignition engine using multiple orifice fuel injection nozzles

Date: June 1, 1930
Creator: Spanogle, J A & Foster, H H
Description: This report presents test results obtained at the Langley Memorial Aeronautical Laboratory of the National Advisory Committee for Aeronautics during an investigation to determine the relative performance of a single-cylinder, high-speed, compression-ignition engine when using fuel injection valve nozzles with different numbers, sizes, and directions of round orifices. A spring-loaded, automatic injection valve was used, centrally located at the top of a vertical disk-type combustion chamber formed between horizontally opposed inlet and exhaust valves of a 5 inch by 7 inch engine.
Contributing Partner: UNT Libraries Government Documents Department
A possible method for preventing the autorotation of airplane wings

A possible method for preventing the autorotation of airplane wings

Date: June 1, 1930
Creator: Schrenk, Oskar
Description: At the suggestion of Professor Betz, the following device was tested with the object of reducing the autorotational speed of airplane wings. The model of a normal wing with the Gottigen profile 420, 1 meter span and 0.2 meter chord was provided with a pair of symmetrical slots on the suction side, connected with each other inside the wing. The arrangement of the testing equipment and models are given and the effect of the slots can be seen in the experimental curves that are included.
Contributing Partner: UNT Libraries Government Documents Department
Propulsion by Reaction

Propulsion by Reaction

Date: June 1, 1930
Creator: Roy, Maurice
Description: This report concerns propulsion by means of rockets. The author concerns himself mainly with efficiency of propulsion and he defines and mathematically expresses those efficiencies.
Contributing Partner: UNT Libraries Government Documents Department
Strength in shear of the thin curved sheets of Alclad

Strength in shear of the thin curved sheets of Alclad

Date: June 1, 1930
Creator: Smith, George Michael
Description: This note is on an investigation made to obtain information on the strength of thin curved sheets of Alclad in shear. Designers may utilize this material as a strength member as well as for a covering for the wings and fuselages. A reduction may then be made in the size of the internal strength members. These experiments were undertaken with the object of securing the maximum value from the metal in this respect. The point at which buckling occurs is of primary importance. The buckling shear of a curved thin plate was determined mathematically and also experimentally. The following formula was obtained mathematically: s=K E t/r in which s is the unit shear, K is a constant, E is the modulus of elasticity, t is the thickness of the material, and r is the radius of curvature. The value of K as determined by the experiments was found to be .075. This formula applies only when s is within the elastic limit of the material. The breaking point of the material was obtained in most of the tests as a matter of information and the results are included in this report. The effect of the supporting ribs was determined by ...
Contributing Partner: UNT Libraries Government Documents Department
Balanced and servo control surfaces

Balanced and servo control surfaces

Date: May 1, 1930
Creator: unknown
Description: Many reports on various control systems are available, but the results cannot be generally applied since the effect of particular changes of surface-form and mounting are subject to variations depending upon airfoil section and influences of airplane layout. This report presents a simple analysis of several control systems in more general use. Elevators, ailerons, and rudders are all discussed.
Contributing Partner: UNT Libraries Government Documents Department
The De Havilland "Moth Three" airplane (British)a high-wing commercial monoplane

The De Havilland "Moth Three" airplane (British)a high-wing commercial monoplane

Date: May 1, 1930
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Development of the Junkers-Diesel aircraft engine

Development of the Junkers-Diesel aircraft engine

Date: May 1, 1930
Creator: Gasterstadt,
Description: The working process of the Junkers engine has resulted from a series of attempts to attain high performance and to control the necessarily rapid and complete combustion at extremely high speeds. The two main problems of Diesel engines in aircraft are addressed; namely, incomplete combustion and the greater weight of Diesel engine parts compared to gasoline engines.
Contributing Partner: UNT Libraries Government Documents Department
Engineering Study of the Seminole Area, Seminole and Pottawatomie Counties, Oklahoma

Engineering Study of the Seminole Area, Seminole and Pottawatomie Counties, Oklahoma

Date: May 1930
Creator: Brandenthaler, R. R.; Morris, W. S. & Bopp, C. R.
Description: Report issued by the Bureau of Mines over engineering studies conducted on Oklahoma oil fields. The results of the studies are presented and discussed. This report includes tables, illustrations, and photographs.
Contributing Partner: UNT Libraries Government Documents Department