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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Spark ignition of flowing gases I : energies to ignite propane-air mixtures in pressure range of 2 to 4 inches mercury absolute

Spark ignition of flowing gases I : energies to ignite propane-air mixtures in pressure range of 2 to 4 inches mercury absolute

Date: August 4, 1949
Creator: Swett, Clyde C , Jr
Description: Ignition studies of flowing gases were made to obtain information applicable to ignition problems in gas-turbine and ram-jet aircraft propulsion systems operating at altitude conditions.Spark energies required for ignition of a flowing propane-air mixture were determined for pressure of 2 to 4 inches mercury absolute, gas velocities of 5.0 to 54.2 feet per second, fuel-air ratios of 0.0607 to 0.1245, and spark durations of 1.5 to 24,400 microseconds. The results showed that at a pressure of 3 inches mercury absolute the minimum energy required for ignition occurred at fuel-air ratios of 0.08 to 0.095. The energy required for ignition increased almost linearly with increasing gas velocity. Shortening the spark duration from approximately 25,000 to 125 microseconds decreased the amount of energy required for ignition. A spark produced by the discharge of a condenser directly into the spark gap and having a duration of 1.5 microseconds required ignition energies larger than most of the long-duration sparks.
Contributing Partner: UNT Libraries Government Documents Department
Spark ignition of flowing gases III : effect of turbulence promoter on energy required to ignite a propane-air mixture

Spark ignition of flowing gases III : effect of turbulence promoter on energy required to ignite a propane-air mixture

Date: January 14, 1953
Creator: Swett, Clyde C , Jr & Donlon, Richard H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Spark ignition of flowing gases V : application of fuel-air-ratio and initial-temperature data to ignition theory

Spark ignition of flowing gases V : application of fuel-air-ratio and initial-temperature data to ignition theory

Date: November 1, 1955
Creator: Swett, Clyde C , Jr
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Spark plug defects and tests

Spark plug defects and tests

Date: January 1, 1920
Creator: Silsbee, F B; Loeb, L B; Sawyer, L G; Fonseca, E L; Dickinson, H C & Agnew, P G
Description: The successful operation of the spark plug depends to a large extent on the gas tightness of the plug. Part 1 of this report describes the method used for measuring the gas tightness of aviation spark plugs. Part 2 describes the methods used in testing the electrical conductivity of the insulation material when hot. Part 3 describes the testing of the cold dielectric strength of the insulation material, the resistance to mechanical shock, and the final engine test.
Contributing Partner: UNT Libraries Government Documents Department
Spark-Source Mass Spectrometric Analysis of Common and Radiogenic Lead

Spark-Source Mass Spectrometric Analysis of Common and Radiogenic Lead

Date: June 11, 1965
Creator: Franklin, John C.
Description: Analysis that is fast and has extremely low levels of detection for more than forty elements that may be present in lead.
Contributing Partner: UNT Libraries Government Documents Department
Spark-timing control based on correlation of maximum-economy spark timing, flame-front travel, and cylinder-pressure rise

Spark-timing control based on correlation of maximum-economy spark timing, flame-front travel, and cylinder-pressure rise

Date: January 1, 1947
Creator: Cook, Harvey A; Heinicke, Orville H & Haynie, William H
Description: An investigation was conducted on a full-scale air-cooled cylinder in order to establish an effective means of maintaining maximum-economy spark timing with varying engine operating conditions. Variable fuel-air-ratio runs were conducted in which relations were determined between the spark travel, and cylinder-pressure rise. An instrument for controlling spark timing was developed that automatically maintained maximum-economy spark timing with varying engine operating conditions. The instrument also indicated the occurrence of preignition.
Contributing Partner: UNT Libraries Government Documents Department
Spark-timing control based on correlation of maximum-economy spark timing, flame-front travel, and cylinder pressure rise

Spark-timing control based on correlation of maximum-economy spark timing, flame-front travel, and cylinder pressure rise

Date: February 1, 1947
Creator: Cook, Harvey A; Heinicke, Orville H & Haynie, William H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The sparking voltage of spark plugs

The sparking voltage of spark plugs

Date: January 1, 1925
Creator: Silsbee, F B
Description: This report has been prepared in order to collect and correlate into convenient and useful form the available data on this subject. The importance of the subject lies in the fact that it forms the common meeting ground for studies of the performance of spark generators and spark plugs on the one hand and of the internal combustion engines on the other hand. While much of the data presented was obtained from various earlier publications, numerous places were found where necessary data were lacking, and these have been provided by experiments in gasoline engines at the Bureau of Standards.
Contributing Partner: UNT Libraries Government Documents Department
Spartan "Cruiser" commercial airplane (British) : a six-seat low-wing cantilever monoplane

Spartan "Cruiser" commercial airplane (British) : a six-seat low-wing cantilever monoplane

Date: August 1, 1932
Creator: unknown
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Spatial buckling of various types of airplane strut systems

Spatial buckling of various types of airplane strut systems

Date: November 1, 1931
Creator: Teichmann, Alfred
Description: Equations are presented for two and three dimensional strut systems along with tables of equations.
Contributing Partner: UNT Libraries Government Documents Department