![]() ![]() Induced flow-the downward flow of air through the rotor disk.Trailing edge-the rearmost edge of an airfoil.As an induced airflow may modify flightpath velocity, relative wind experienced by the airfoil may not be exactly opposite its direction of travel. This is rotational relative wind for rotary-wing aircraft and is covered in detail later. Relative wind-defined as the airflow relative to an airfoil and is created by movement of an airfoil through the air.The rotational velocity of the rotor blade is lowest closer to the hub and increases outward towards the tip of the blade during rotation. For helicopter rotor blades, flightpath velocity is equal to rotational velocity, plus or minus a component of directional airspeed. For airfoils on an airplane, the flightpath velocity is equal to true airspeed (TAS). Flightpath velocity-the speed and direction of the airfoil passing through the air.Leading edge-the front edge of an airfoil.The profile thickness and thickness distribution are important properties of an airfoil section. By varying the point of maximum camber, the manufacturer can tailor an airfoil for a specific purpose. The location of maximum camber and its displacement from the chord line are expressed as fractions or percentages of the basic chord length. Maximum camber (displacement of the mean camber line from the chord line) and its location help to define the shape of the mean camber line. The shape of the mean camber is important for determining aerodynamic characteristics of an airfoil section. Camber refers to curvature of the airfoil and may be considered curvature of the mean camber line. The chord line connects the ends of the mean camber line. Mean camber line-a line drawn halfway between the upper and lower surfaces of the airfoil.Chord-the length of the chord line from leading edge to trailing edge it is the characteristic longitudinal dimension of the airfoil section.
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