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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Some experiments on autorotation of an airfoil

Some experiments on autorotation of an airfoil

Date: September 1, 1929
Creator: Ober, Shatswell
Description: These experiments show that the rate of auto rotation of a monoplane airfoil is reduced by sweepback, ceasing entirely when the sweepback is 30 degrees. In addition a very serious increase in rate and range of auto rotation with yaw is shown.
Contributing Partner: UNT Libraries Government Documents Department
Some experiments on the flutter of sweptback cantilever wing models at Mach number 1.3

Some experiments on the flutter of sweptback cantilever wing models at Mach number 1.3

Date: March 15, 1951
Creator: Tuovila, W J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some experiments on the slipstream effect

Some experiments on the slipstream effect

Date: March 1, 1937
Creator: Ferrari, C
Description: The models designated "Torino 30, 31, 32" are horizontal tail surfaces of rectangular, triangular, and elliptical plan form and all of the same profile section. Tests were carried out with the object being to determine the effect of the propeller slipstream on the aerodynamical characteristics of the horizontal stabilizer. The results presented correspond to a first series of tests made without an interposed wing and in which the distance between the plane of the propeller disk and the tail was maintained constant.
Contributing Partner: UNT Libraries Government Documents Department
Some experiments on visualization of flow fields behind low-aspect-ratio wings by means of a tuft grid

Some experiments on visualization of flow fields behind low-aspect-ratio wings by means of a tuft grid

Date: May 1, 1952
Creator: Bird, John D & Riley, Donald R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some experiments relating to the problem of simulation of hot jet engines in studies of jet effects on adjacent surfaces at a free-stream Mach number of 1.80

Some experiments relating to the problem of simulation of hot jet engines in studies of jet effects on adjacent surfaces at a free-stream Mach number of 1.80

Date: July 11, 1956
Creator: Bressette, Walter E
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some factors affecting automatic control of airplanes

Some factors affecting automatic control of airplanes

Date: February 20, 1952
Creator: Mathews, Charles W
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some factors affecting combustion in an internal-combustion engine

Some factors affecting combustion in an internal-combustion engine

Date: January 1, 1936
Creator: Rothrock, A M & Cohn, Mildred
Description: An investigation of the combustion of gasoline, safety, and diesel fuels was made in the NACA combustion apparatus under conditions of temperature that permitted ignition by spark with direct fuel injection, in spite of the compression ratio of 12.7 employed. The influence of such variables as injection advance angle, jacket temperature, engine speed, and spark position was studied. The most pronounced effect was that an increase in the injection advance angle (beyond a certain minimum value) caused a decrease in the extent and rate of combustion. In almost all cases combustion improved with increased temperature. The results show that at low air temperatures the rates of combustion vary with the volatility of the fuel, but that at high temperatures this relationship does not exist and the rates depend to a greater extent on the chemical nature of the fuel.
Contributing Partner: UNT Libraries Government Documents Department
Some factors affecting fabrication and high-temperature strength of molybdenum disilicide

Some factors affecting fabrication and high-temperature strength of molybdenum disilicide

Date: April 17, 1952
Creator: Maxwell, W A
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Some factors affecting the reproducibility of penetration and the cut-off of oil sprays for fuel-injection engines

Some factors affecting the reproducibility of penetration and the cut-off of oil sprays for fuel-injection engines

Date: January 1, 1928
Creator: Beardsley, E G
Description: This investigation was undertaken at the Langley Memorial Aeronautical Laboratory in connection with a general research on fuel-injection for aircraft. The purpose of the investigation was to determine the factors controlling the reproducibility of spray penetration and secondary discharges after cut-off. The development of single sprays from automatic injection valves was recorded by means of special high-speed photographic apparatus capable of taking 25 consecutive pictures of the moving spray at a rate of 4,000 per second. The effect of two types of injection valves, injection-valve tube length, initial pressure in the injection-valve tube, speed of the injection control mechanism, and time of spray cut-off, on the reproducibility of spray penetration, and on secondary discharges were investigated. It was found that neither type of injection valve materially affected spray reproducibility. The initial pressure in the injection-valve tube controlled the reproducibility of spray penetrations. An increase in the initial pressure or in the length of the injection-valve tube slightly increased the spray penetration within the limits of this investigation. The speed of the injection-control mechanism did not affect the penetration. Analysis of the results indicates that secondary discharges were caused in this apparatus by pressure waves initiated by the rapid opening of ...
Contributing Partner: UNT Libraries Government Documents Department
Some factors affecting the stability and performance characteristics of canard aircraft configurations

Some factors affecting the stability and performance characteristics of canard aircraft configurations

Date: June 23, 1958
Creator: Spearman, M Leroy & Driver, Cornelius
Description: None
Contributing Partner: UNT Libraries Government Documents Department