Aerodynamics

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Across
  1. 2. heaviness.
  2. 6. a fake real-world thingy.
  3. 8. what is this crossword about again?
  4. 11. last name of the people who made the first airplane.
  5. 12. plane go zoom.
  6. 13. a brick doesn't fly well because of this, but not weight.
  7. 14. greek for air, + aluminum ____.
  8. 15. a thing that flies.
  9. 16. war Russians bad, nuke good.
  10. 20. a calculator does a couple ____________ to find out what 1+1 is.
Down
  1. 1. name of speed of sound
  2. 3. powers a plane
  3. 4. what wing do?
  4. 5. a calculator is good at ____.
  5. 7. basically trees and stuff.
  6. 9. what you should do to make a plane or car, you ______ a vehicle.
  7. 10. the name for faster than sound speeds.
  8. 17. how does a liquid move?
  9. 18. Lilienthal the guy who made the first manned glider.
  10. 19. a swirl of air caused by a wingtip.