The NASA X-29, built by Grumman, was an aircraft built to t…
The NASA X-29, built by Grumman, was an aircraft built to test the performance of forward swept wings and advanced composite materials. Reply with why they swept wings that way! Source https://www.nasa.gov/centers/armstrong/news/FactSheets/FS-008-DFRC.html
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Vortex control/reduction and high altitude control.
When in was a kid I remember getting a airplane book and seeing this.