The High Speed, Low Drag Northrop X-21
The prototype’s wing lift was artificially boosted by an extensive pattern of razor-thin slots in the upper wing surface to reduce drag.
The prototype’s wing lift was artificially boosted by an extensive pattern of razor-thin slots in the upper wing surface to reduce drag.
Engineers working on NASA’s X-57 Maxwell are closing in on the all-electric experimental airplane’s first flight test, expected as early as September 20.