Читать книгу Flight Theory and Aerodynamics - Joseph R. Badick - Страница 90

 Flight path velocity: The speed and direction of a body passing through the air.

 Relative wind (RW): The speed and direction of the air impinging on a body passing through it. It is equal and opposite in direction to the flight path velocity.

 Angle of attack (AOA or α, pronounced alpha): The acute angle between the relative wind and the chord line of an airfoil.

 Aerodynamic force (AF): The net resulting static pressure multiplied by the planform area of an airfoil.

 Lift: The component L of the aerodynamic force that is perpendicular to the relative wind.

 Drag: The component D of the aerodynamic force that is parallel to the relative wind.

 Center of pressure (CP): The point on the chord line where the aerodynamic force acts.

 Laminar flow or streamlined flow: Smooth airflow with little transfer of momentum between parallel layers.

 Turbulent flow: Airflow where the streamlines break up and there is much mixing of the layers.