Leonardo DA vinci ornithopter

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Across
  1. 2. what it was meant for
  2. 4. the pilot had to use his/her
  3. 5. who improved it
  4. 8. the 3rd person associated with flying
  5. 13. the inventor of machine
  6. 14. it is now known as a
  7. 15. the pilot would ____ his/her arms to fly it
Down
  1. 1. what was the frame made of
  2. 3. who 2nd person to improve the machine
  3. 6. the machine
  4. 7. every flying machine has then
  5. 9. another base of the machine
  6. 10. what was the wings made of
  7. 11. a tiny creature it was also based on
  8. 12. the base of the machine
  9. 14. hard to lift