Aviation Legends: X-Planes

Challenge #297 in the The sky is the limit series. Hosted by alex326.
Challenge is now open for voting (some tips)
Any X-plane or similar experimental / prototype aircraft. For non-US officially designated X-planes, a brief description is recommended so everybody could learn something on the aviation achievements.
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phase has
7 entries
voting phase ends
50 votes
Tacit Blue
Glamorous Glennis-
Bell X-1E
The magnificent YF23
Boeing 2707 SST Prototype Mock-up. All That Remains
D72_4852_DxO Smug
Rockwell-MBB X-31
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