File:Probing the Sky.pdf
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English: In the decades since the Wright brothers' first flights, a body of knowledge and tools, created in an evolutionary process of small steps, had been built up to guide engineers and researchers in developing new aircraft. The early wood-and-fabric biplanes had given way to all-metal monoplanes. Aircraft size, range, and payload had also grown, until the oceans could be spanned in a fraction of the time a ship would take. Speed became the critical factor in both commercial and military operations. |
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| Source | http://www.nasa.gov/connect/ebooks/probing_the_sky_detail.html |
| Author | Curtis Peebles |
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This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.) |  |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 21:37, 11 October 2015 |  | 937 × 1,433, 344 pages (17.57 MB) | EC-CAD (talk | contribs) | {{Information |Description ={{en|1=In the decades since the Wright brothers' first flights, a body of knowledge and tools, created in an evolutionary process of small steps, had been built up to guide engineers and researchers in developing new airc... |
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