Originally posted by jtabeb
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GTL at STP is a relatively stable liquid with boiling point properties very similar to diesel (Initial boiling point greater than 150 C vs about 170 for typical diesel, final boiling point generally greater than 350 in both cases). Typical diesel/GTL RVP is about 2 kPa compared with motor gasoline (summer) RVP about 50 kPa.
What is it about GTL that makes you think that pressurized storage in the fuselage is necessary?
Originally posted by jtabeb
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Especially if the fuel management systems and engine characteristics can be engineered to overcome the problems caused by the viscosity differential between the fuels.
Originally posted by jtabeb
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Why can't GTL, a liquid at STP and similar in characteristics to diesel and kerosene, be used in conventional wing tanks?
Originally posted by metalman
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The airlines are scrambling around trying to come up with politically correct responses. Last year Virgin Group's Richard Branson proposed using tugs to tow aircraft between ramps and runways to lower CO2 emissions (smart man...this would save him fuel and transfer the cost to the airport authorities, where they could argue forever about landing fee increases). The Shell-Qatar-Airbus GTL flight (some GTL blended into conventional jet fuel) was a nice promotion for Shell's Pearl GTL project in the State of Qatar, but not much else. Expect more PR stuff and stunts, as the airlines and manufacturers try to prevent their reputations from being trashed as environmental pariahs.
In the meantime, the search for suitable substitutes for crude based aviation fuels will be an interesting challenge that should soak up untold amounts of alternate energy government subsidies. And as cheap oil becomes scarcer, there is the possibility that flying once again becomes the exclusive purview of the financially well off gin and Jaguar set, and the business/government/UN expense account groupies (how else are they going to get to Davos and all those climate change conferences?).



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