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Across
  1. 4. the study of the properties of moving air
  2. 5. the force that directly opposes the weight of an airplane
Down
  1. 1. ______'s principle that makes an airplane fly
  2. 2. used to test the aerodynamics of different inventions like planes or even trucks
  3. 3. a craft that is capable of vertical take-off due to propellers