#aerodynamic_force__aerodynamicforce  forces acting on airfoils in motion relative to the air (or other gaseous fluids)
  supertype:  force  the physical influence that produces a change in a physical quantity; "force equals mass times acceleration"
  subtype:  aerodynamic_lift__aerodynamiclift__lift  the component of the aerodynamic forces acting on an airfoil that opposes gravity
     subtype:  ground_effect  apparent increase in aerodynamic lift experienced by an aircraft flying close to the ground

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