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The screw propeller geometry
Here we will define the geometry and vocabulary to describe a screw propeller

• he X axis represents the axis of rotation or the propeller shaft.The direction and speed of the upstream fluid is parallel to the X axis
• The y-axis Represented the axis of the blade. For variable pitch propellers is the pitch change axis.
• P represents the plane of rotation of the propeller. The disc swept by the blades of the propeller, is located on the plane of rotation.
• W is the angular velocity of rotation. This speed can be given in radians / second (rad / sec) or revolutions per minute (Rpm or rev / min)

The propeller blade is described by profiles, which divide it into elements:

Bootup screen software propellers and wings design HELICIEL

The elements of the blades are framed by profiles located at a distance R on the axis of blades:

To optimize the efficiency of the propeller blade profiles are usually aerodynamic or hydrodynamic shape. (Detailed profiles blades Description).

• The profile chord line connecting the leading edge to the trailing edge
• L = chord length
• A= leading edge(attack) of the profile
• B= trailing edge of the profile
• e= Maximum thickness profile