The "Avro Trainer" Airplane (British): A Training Biplane (open access)

The "Avro Trainer" Airplane (British): A Training Biplane

Circular presenting a description of the Avro Trainer airplane, which is primarily intended for pilots in training and is designed to be easy to use, including large, comfortable cockpits, good view, effective windshields, and wide track. Details of the design, flight characteristics, drawings, and photographs are provided.
Date: June 1930
Creator: unknown
System: The UNT Digital Library
Calibration and lag of a Friez type cup anemometer (open access)

Calibration and lag of a Friez type cup anemometer

"Tests on a Friez type cup anemometer have been made in the variable density wind tunnel of the Langley Memorial Aeronautical Laboratory to calibrate the instrument and to determine its suitability for velocity measurements of wind gusts. The instrument was calibrated against a Pitot-static tube placed directly above the anemometer at air densities corresponding to sea level, and to an altitude of approximately 6000 feet. Air-speed acceleration tests were made to determine the lag in the instrument reading. The calibration results indicate that there should be an altitude correction. It is concluded that the cup anemometer is too sluggish for velocity measurements of wind gusts" (p. 1).
Date: June 1930
Creator: Pinkerton, Robert M.
System: The UNT Digital Library
The Cierva "Autogiro" Mark III (British): Armstrong-Siddeley "Genet Major" Engine (open access)

The Cierva "Autogiro" Mark III (British): Armstrong-Siddeley "Genet Major" Engine

Circular describing the Cierva Autogiro Mark III. Details of the constructional features, characteristics, drawings, and photographs are provided.
Date: June 1930
Creator: unknown
System: The UNT Digital Library
Contribution to the Theory of Propeller Vibrations (open access)

Contribution to the Theory of Propeller Vibrations

This report presents a calculation of the torsional frequencies of revolving bars with allowance for the air forces. Calculation of the flexural or bonding frequencies of revolving straight or tapered bars in terms of the angular velocity of revolution. Calculation on the basis of Rayleigh's principle of variation. There is also a discussion of error estimation and the accuracy of results. The author then provides an application of the theory to screw propellers for airplanes and the discusses the liability of propellers to damage through vibrations due to lack of uniform loading.
Date: June 1930
Creator: Liebers, F.
System: The UNT Digital Library
The Gaseous Explosive Reaction: The Effect of Pressure on the Rate of Propagation of the Reaction Zone and Upon the Rate of Molecular Transformation (open access)

The Gaseous Explosive Reaction: The Effect of Pressure on the Rate of Propagation of the Reaction Zone and Upon the Rate of Molecular Transformation

This study of gaseous explosive reaction has brought out a number of important fundamental characteristics of the explosive reaction indicating that the basal processes of the transformation are much simpler and corresponds more closely to the general laws and principles of ordinary transformations than is usually supposed. The report calls attention to the point that the rate of molecular transformation within the zone was found in all cases to be proportional to pressure, that the transformation within the zone is the result of binary impacts. This result is of unusual interest in the case of the reaction of heavy hydrocarbon fuels and the reaction mechanism proposed by the recent kinetic theory of chain reactions.
Date: June 14, 1930
Creator: Stevens, F. W.
System: The UNT Digital Library
"Gloster" Metal Construction (open access)

"Gloster" Metal Construction

This report details the methods of construction employed by the Gloster Company in their fabrication of metal aircraft parts. Ribs, spars, wings, and metal treatments to prevent oxidation are all discussed.
Date: June 1930
Creator: unknown
System: The UNT Digital Library
Identification of Aircraft Tubing by Rockwell Test (open access)

Identification of Aircraft Tubing by Rockwell Test

A large number of tests were made on tubes of 1025 and 4130X steel, in various diameters and wall thicknesses, and after diverse heat treatments. The Rockwell B scale was employed, as being the best suited to the ranges of hardness encountered. Only satisfactory chrome molybdenum tubes were found to show a hardness in excess of 90-B after normalizing.
Date: June 1930
Creator: Knerr, Horace
System: The UNT Digital Library
Identification of Aircraft Tubing by Rockwell Test (open access)

Identification of Aircraft Tubing by Rockwell Test

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.
Date: June 1930
Creator: Knerr, Horace
System: The UNT Digital Library
The "Junkers-Junior" Light Airplane (German): A Two-Seat All-Metal Low-Wing Cantilever Monoplane (open access)

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

Circular presenting a description of the Junkers-Junior light airplane, which is a cantilever all-metal low wing monoplane. Details of the wings, interior, fuselage, elevator, controls, landing gear, fuel, engines, characteristics, drawings, and photographs are provided.
Date: June 1930
Creator: unknown
System: The UNT Digital Library
Performance of a high-speed compression-ignition engine using multiple orifice fuel injection nozzles (open access)

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

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.
Date: June 1930
Creator: Spanogle, J. A. & Foster, H. H.
System: The UNT Digital Library
A Possible Method for Preventing the Autorotation of Airplane Wings (open access)

A Possible Method for Preventing the Autorotation of Airplane Wings

"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" (p. 1).
Date: June 1930
Creator: Schrenk, Oskar
System: The UNT Digital Library
Propulsion by Reaction (open access)

Propulsion by Reaction

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.
Date: June 1930
Creator: Roy, Maurice
System: The UNT Digital Library
Strength in Shear of the Thin Curved Sheets of Alclad (open access)

Strength in Shear of the Thin Curved Sheets of Alclad

"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" (p. 1).
Date: June 1930
Creator: Smith, George Michael
System: The UNT Digital Library