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| 1. The Puffin This amazing design is the Puffin Personal Aircraft. It is designed to go about 150 miles an hour for about 50 miles. Needless to say, it has been one of NASA's most viral images. |
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| 2. Green Supersonic Machine This concept design by Lockheed Martin is one that the company presented to NASA in April of last year and is designed for overland supersonic flight. It showed that by using the inverted V engine under the wing configuration, one can really lower the level of supersonic booms. |
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