REVIEW EXERCISE - 5.51

1.  Leonardo da Vinci John Stringfellow Cayley Chanute A.M. Herring Samuel Pierpont Langley Charles H. Manley built many models of ornithopters.

2. During his lifetime Leonardo da Vinci John Stringfellow Cayley Chanute A.M. Herring Samuel Pierpont Langley Charles H. Manley identified the forces of drag, and thrust as they applied to aviation.

3. Leonardo da Vinci John Stringfellow Cayley Chanute A.M. Herring Samuel Pierpont Langley Charles H. Manley was the director of the Smithsonian Institution.

4. Leonardo da Vinci John Stringfellow Cayley Chanute A.M. Herring Samuel Pierpont Langley Charles H. Manley built the first steam-driven aircraft which flew.