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Home The second leg of the stool – a semi-span model (half of a configuration) undergoes flutter testing in a NASA Langley wind tunnel. (NASA Langley/Sandie Gibbs) The second leg of the stool – a semi-span model (half of a configuration) undergoes flutter testing in a NASA Langley wind tunnel. (NASA Langley/Sandie Gibbs)

The second leg of the stool – a semi-span model (half of a configuration) undergoes flutter testing in a NASA Langley wind tunnel. (NASA Langley/Sandie Gibbs)

The second leg of the stool – a semi-span model (half of a configuration) undergoes flutter testing in a NASA Langley wind tunnel. (NASA Langley/Sandie Gibbs)

The second leg of the stool – a semi-span model (half of a configuration) undergoes flutter testing in a NASA Langley wind tunnel. (NASA Langley/Sandie Gibbs)

The first leg of the stool – computational capabilities that, in this case, show sound produced by air around jet engine rotors that would turn in opposite directions. (NASA / Tim Sandstrom)
NASA plans to design, build and fly a series of X-planes to test advanced green aviation technologies. (NASA / Maria C. Werries)

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