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.

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.

Measurement of axial position of all blades with respect to each other.

Right hand propeller rotates clockwise when viewed from astern facing forward. Left hand propeller rotates counter clockwise when viewed astern facing forward. Twin screw applications utilize both LH [..]

By convention the blade located at the position of the keyway is identified as Blade 1, the next blade in rotation is Blade2 and so on.

Section length is the same as blade width. Each station is expressed as a percent of radius increment ( eg 40 radius is 40% of the blade radius) .   Aerofoil Crescent Blade Section Types Naca: Symmetr [..]