Maximum reach of the blade from the centre of the hub. Separates the leading and trailing edges.

Defined as the maximum radius of one blade multiplied by 2. The diameter of the circle scribed by the blade tips as the propeller rotates. General rules: Diameter usually increases as engine power inc [..]

Angle of the pressure face along the pitch line with respect to the plane of rotation measured in degrees. Pitch angle decreases from the blade root to the tip in order to maintain constant pitch. Rel [..]

A line that passes through the Leading Edge and Trailing Edge of a blade used as a reference for pitch angle.

Linear reference line passing through hub centre on the axis of propeller rotation.

Linear reference line that locates the blade on the hub. Perpendicular to the Propeller Centre Line (PCL).

Linear reference line that indicates propeller rake.

Reference line that intersects each cylindrical section at the midpoint of the blade section width. Indicates propeller skew.

Propeller blade will slant forward or aft from the Blade Centre Axis (BCA). Positive rake - blade slants towards aft end of the hub. Negative rake - blade slants towards forward end of the hub. Can be [..]

Blade Centre Line is curvilinear sweeping back from the direction of rotation. Contour of the blade is not radially symmetrical about blade centre axis.