Camber refers to curvature of the airfoil and may be considered as 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.
Blade span-the length of the rotor blade from center of rotation to tip of the blade.Airfoils are carefully structured to accommodate a specific set of flight characteristics. In some conditions, parts of the fuselage, such as the vertical and horizontal stabilizers, can become airfoils. The main and tail rotor blades of the helicopter are airfoils, and air is forced to pass around the blades by mechanically powered rotation. Certain airfoils, such as rotor blades, combine some of these functions. Airfoils are also used for stability (fin), control (elevator), and thrust or propulsion (propeller or rotor). Airfoils are most often associated with production of lift. An airfoil is any surface producing more lift than drag when passing through the air at a suitable angle. Helicopters are able to fly due to aerodynamic forces produced when air passes around the airfoil.
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