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6.1 Helicopter Aerodynamics

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Aerofoil

Is a part or surface, such as a wing, propeller blade, or rudder, whose shape and orientation control stability, direction, lift, thrust, or propulsion.

Span

The linear distance between the extremities of an aerofoil e.g. Blade span is the length of the blade from tip to root in a straight line; Rotor span is the distance from tip to tip of the blades in a straight line;

Wingspan of an aircraft is always measured in a straight line, from wingtip to wingtip, independently of wing shape or sweep. (A to B)

Camber Line

Is a line joining the leading and trailing edges of an aerofoil equidistant from the upper and lower surfaces. Also known as mean camber line.

A cross section of an aerofoil.

Chord Line

The distance, along an imaginary straight line, from the stagnation point of an aerofoil to the rear, or trailing edge.