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Review Exercise - 5.51 (Answers)

Thank you ,

1. Leonardo da Vinci built many models of ornithopters.

2. During his lifetime Cayley identified the forces of drag, and thrust as they applied to aviation.

3. Samuel Pierpont Langley was the director of the Smithsonian Institution.

4. John Stringfellow built the first steam-driven aircraft which flew.

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