Abstract
Abstract Advanced versions of commercial transport aircraft which are designed to begin service in the 1990 decade may well be fueled with liquid hydrogen. Conventional petroleum-base jet fuel is predicted to become economically unattractive in that time period as the world's crude oil is consumed. Synthetic jet fuel, liquid methane and liquid hydrogen are the best alternative fuels to succeed the petroleum-base product. Studies have shown liquid hydrogen offers significant advantages over jet fuel in aircraft applications. LH z -fueled aircraft are lighter, quieter, have smaller wing area, require shorter runways and minimize pollution. They also use less energy, not only in terms of the fuel required to fly the design mission, but also including the energy required to manufacture the alternate fuels from coal and water. The advantage for hydrogen increases as the aircraft fuel requirement for the design mission increases. Using hydrogen as fuel in supersonic transport aircraft is particularly advantageous. Liquid methane has not yet been evaluated on an equitable basis as a fuel for transport aircraft.
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