Bio fuel has been considered worldwide as an alternative fuel of oil due to the earth environmental and energy dry-out problem. It has been considered that bio fuel is environmentally gentle because it has a property of carbon neutral offsetting carbon dioxide that it is produced from a bio-mass which absorbs carbon oxide during its growing and produces it during combustion. Besides bio mass is one of new energies since it is produced repeatedly. Recently application of bio fuel to aerospace fuel is making a progress due to the bio fuel properties; for example, Brazilian NEIVA Company's small airplane flight by bio fuel, Virgin Atlantic Airline' s B747 flight by coconut oil, and JAL flight by three kinds blended bio fuel. It is possible in the near future that bio fuel will be used widely as an aerospace fuel.
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