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The Military

Submission + - Air Force lab test out "aircraft surfing" technique to save fuel ( 1

coondoggie writes: "It's not a totally new concept, but the Air Force is testing the idea of flying gas-guzzling cargo aircraft inline allowing the trailing aircraft to utilize the cyclonic energy coming off the lead plane- a concept known as vortex surfing — over long distances to save large amounts of fuel. According to an Air force release, a series of recent test flights involving two aircraft at a time, let the trailing aircraft surf the vortex of the lead aircraft, positioning itself in the updraft to get additional lift without burning extra fuel."
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Air Force lab test out "aircraft surfing" technique to save fuel

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It is easier to change the specification to fit the program than vice versa.