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Pitch refers to the angle of the blades on a helicopter or propeller compared to a fixed datum. The angle of attack of the blade is determined by the pitch and the speed air is flowing through the propellor/rotor.

The angle of attack of an airfoil determines the lift and drag produced. Thus the pitch of a propellor/rotor blade and the airspeed of the aircraft affects the torque required to drive it, as well as the thrust produced.

Propeller Pitch

When applied to propellers, pitch indicates the distance a propeller would move through a static medium per revolution.

Helicopter Pitch

Pitch can be applied to the main rotor of a CP heli as well as the tail rotor of a belt or shaft-driven tail. It is usually measured in degrees.