Aerospace & Aviation

Beta lyrae - theory of photometric and spectrographic behavior with model

Nasa manned space flight program and spacecraft center facilities

Identification and control of linear dynamic systems with unknown parameters

Recent research on pneumatic tire hydroplaning has been collected and summarized with the aim of describing what is presently known about the phenomena of tire hydroplaning. A physical description of tire hydroplaning is given along with formulae for estimating the ground speed at which it occurs. Eight manifestations of tire hydroplaning which have been experimentally observed are presented and discussed. These manifestations are: detachment of tire footprint, hydrodynamic ground pressure, spin-down of wheel, suppression of tire bow wave, scouring action of escaping fluid in tire-ground footprint region, peaking of fluid displacement drag, loss in braking traction, and loss of tire directional stability. The vehicle, pavement, tire, and fluid parameters of importance to tire hydroplaning are listed and described. Finally, the hazards of tire hydroplaning to ground and air-vehicle-ground performance are listed, and procedures are given to minimize these effects.

Pressure distribution on base and afterbody of missile configuration with and without jet flow using single and multiple nozzles

Steady-state characteristics of differential pressure system for evaluating angles of attack and sideslip of ranger iv vehicle

Measurements of shock wave overpressures from airplanes at altitudes to 75,000 feet & supersonic speed

Electrolyte pulsing using carbon electrode for improved fuel cell operation

Low-subsonic flight characteristics of model supersonic aircraft configuration with parawing as a landing aid

Automatic mapping of geomagnetic field & electric current flow in ionosphere

Measurement of ion concentration and total ion density in exosphere using mass spectrometer and electrostatic probe

Supersonic air transport flight profile simulation for air traffic control development and flight planning

Effects of two nickel alloy braze coatings, heat treatments, and processing variables on rupture strength of sheet metals

Exhaust nozzle recombination of hydrogen fuel in subsonic ramjet engines at hypersonic speeds

Processes for utilization of lunar resources - reduction of silicates to produce oxygen