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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Particle concentrations and size distribution on Luster sounding rocket surfaces exposed to Leonid meteroid shower, comparing contamination and extraterrestrial origins
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Sonic boom signatures produced by diverse SST configurations during cruise, indicating aircraft length as overpressure limit factor
Modified supersonic turbine cycle provides cooling air to surrounding structures. Simplified mechanical design assures correct balance of air flow, allows direct issue of cool air to the structure, and assists in matching turbine work output to work input required by the compressor.
Test lead wire attachment quickly and securely engages screw head by expansion against the side walls of the screw head slot. Heat shrinkable tubing is used for the forward and shaft ends to insulate the device from accidental contact.
Turbine-compressor system for active cooling of hypersonic aircraft
Microparticle collection experiments during 1966 Orionid and Leonid meteor showers accomplished by Luster and ALARR /air launched-air recovered rocket/ instruments
SST configurations minimizing sonic booms obtainable for given length and weight
Economic impact of modifications to DC-8 aircraft nacelles to reduce fan-compressor noise - Part 5
Low sonic boom design for supersonic transport configurations
Wind tunnel effects on experimental sonic boom signature determinations
Noctilucent cloud particle size composition and origin from sounding rocket flight and control collecting surfaces
Photographic observation of noctilucent cloud occurrence over geographical location during sounding rocket flight
SST sonic boom minimization, discussing cross- country flight
Unique methods for analyzing individual particles ranging in size from 0.01 to 1000 micrometers have been developed for investigation of nature of cosmic dust. Methods are applicable to particulate aerosols and contaminants characteristically encountered in studies of air pollution and in experiments designed to abate pollution.
An error model is described for the Apollo 15 sun compass, a contingency navigational device. Field test data are presented along with significant results of the test. The errors reported include a random error resulting from tilt in leveling the sun compass, a random error because of observer sighting inaccuracies, a bias error because of mean tilt in compass leveling, a bias error in the sun compass itself, and a bias error because the device is leveled to the local terrain slope.
A configuration designed to produce near field signature has been tested at M = 2.71 and the results are analyzed, by taking in account three-dimensional and second order effects. The configuration has an equivalent total area distribution that corresponds to an airplane flying at 60,000 ft. having a weight of 460,000 lbs, and 300 ft. length. A maximum overpressure of 0.95 lb/square foot has been obtained experimentally. The experimental results agree well with the analysis. The investigation indicates that the three-dimensional effects are very important when the measurements in wind tunnels are taken at small distances from the airplane.
Methods for analyzing atmospheric aerosols and particulate contaminants from natural and industrial sources are briefly described. Their development was spurred by interest in cosmic dust investigations. These methods make it possible to analyze individual particles ranging in size from 0.01 to 1000 microns for elemental and mineralogical content. The described methods include transmission electron microscopy, scanning electron microscopy, electron probe microanalysis, X-ray diffraction, optical mineralogy, and density measurement.