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The most efficient realistic aircraft.

21.1k tl  4 months ago

Yesterday was Aviation day.
I would like to follow in the footsteps of invention challenges.
The most efficient realistic airplane. Realistic to a point that I can make it in reality and it will be perfect. A design like no other. Not futuristic. Dimensions and materials should be added, along with math for cost.
The plane can be either military Jets, civil planes (small please, if possible) or airliners.
-Good luck, TTL