EDWARDS AIR FORCE BASE — If you think your fuel bill has skyrocketed, pity the people who operate the eight-engine B-52 bomber.
The lumbering aircraft, built in the 1950s when jet fuel cost a quarter a gallon, guzzles 47,000 gallons in a single mission. Today, that's $100,000 a fill-up.
Tally in the gas hogs in Iraq, Afghanistan and elsewhere — fighter jets, bombers and cargo planes — and you can understand why the American taxpayer got a $5 billion fuel bill last year for the Air Force alone.
On Tuesday, the Air Force will begin test flights here that could represent a major step in the Pentagon's plan to find less costly sources of fuel. A B-52 will take off with two of its engines burning a new blend that may eventually replace the oil-based kerosene formula that has powered jet engines since they were invented.
The test flight, which will be observed by top military officials and airline executives, will mark the first time a U.S. aircraft will attempt to fly using fuel not refined from oil.
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Fuel costs have contributed to financial woes at many domestic airlines and begun to hit the pocketbooks of travelers. Fuel now accounts for about 30 percent of the industry's operating costs, compared to about 10 percent five years ago.
ATA estimates that every penny a gallon increase in oil prices adds $195 million in overhead to the industry. Many airlines are passing along the cost, up to $100 for each passenger in some cases.
A spokeswoman for the airline industry said that development of "alternatives to traditional oil-based jet fuel" was a key priority, particularly if the fuel could be derived from a stable and cheaper domestic source.
The test flights also represent what the Pentagon says is a 10-year plan to wean itself from crude oil and foreign petroleum producers who supply about half of the fuel used by the U.S. military.
The fuel being tested is a 50-50 blend of traditional crude-oil based jet fuel and a synthetic liquid, which is made from natural gas but will eventually be refined from U.S.- produced coal.
"This is an extremely important moment," said Michael A. Aimone, the Air Force assistant deputy chief of staff for logistics.
By 2016, the Pentagon hopes to have about half of its aviation fuel come from alternative sources.
"There will be a lot of people interested in what we are doing," said Col. Arnie Bunch, commander of the 412th Test Wing, whose pilots will be spearheading the test flights.
Alternative fuels have been too costly or in short supply. The makers of the synthetic jet fuel that is being tested would need to build a $1 billion plant to produce adequate supplies that would make it economical for the aviation industry. Since it doesn't make economic sense now, Wall Street is hesitant to investment in such a plant.
Gary Gamino, director of investor relations for the fuel producer Tulsa, Okla.-based Syntroleum, said the company won't know the actual cost of the fuel until a full-scale production plant is built. But he added that the business could achieve acceptable returns if crude oil prices were higher than $50 a barrel. In recent weeks, crude oil has hovered around $65 a barrel.
The company currently operates a small plant that can produce 70 barrels a day, just enough for testing. Syntroleum is one of only two companies in the U.S. that produce the synthetic fuel. The Air Force paid about $20 a gallon for the prototype fuel.
Tuesday's test flight "is very important because it will prove to the world that this synthetic fuel will work in aircraft as we have tested in other vehicles," including diesel powered buses, he said.
For its part, the Air Force wants to help create the commercial market for the fuel and envisions purchasing up to 100 million gallons of the fuel by 2008. It has bought 100,000 gallons so far for testing.
"We can expand the market for synthetic jet fuel and make it more economical to produce by increasing volume," Aimone said.
The U.S. has the world's largest proven coal reserves, or about 268 billion tons, mostly in the Midwest. Converting 5 percent of the coal reserves to synthetic would be equivalent to doubling the domestic crude oil output, Gamino said. The U.S. consumes about 7.5 billion tons of crude oil pumped from domestic sources annually while using only about 5 million tons of coal.
But refining coal is likely to face opposition from environmental groups. It is unclear how much carbon and other pollutants would be emitted from large scale synthetic fuel plants though refiners argue that emissions can be mitigated. The emission from jet engines using the fuel are not expected to pose environmental concerns since the fuel produces no sulfur and insignificant pollutants, researchers say.
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The technology to turn coal into liquid fuel was developed in the 1920s by two German scientists — Franz Fischer and Hans Tropsch — to make up for scarce oil supplies. The fuel was vital to the German military during World War II.
But the fuel remained mostly grounded because of lower cost of crude oil. South Africa used the so-called Fischer-Tropsch process for its energy needs during its Apartheid period when the country was under an oil embargo.
The process has regained attention as record oil prices prompted calls for reducing U.S. dependence on foreign oil.
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Air Force researchers have been testing the fuel in jet engines run in an Oklahoma laboratory, and so far the results have been positive, Air Force officials said. A turbofan engine powered by half synthetic and half conventional jet fuel performed just as well as when the engine was burning only traditional fuel.
"You couldn't tell which fuel they were running," Vince Zaccardi, an Air Force engineering specialist, told Aviation Week. Air Force engineers also found that the emission from the engine burning the fuel blend had half of the sulfur content, reflecting the synthetic fuel mix.
The test flight Tuesday will involve a B-52 that was loaned from Minot Air Force Base in North Dakota and fitted with instrumentation and other equipment to monitor and gather data from the flight.
