Rundquist Propeller Tools, Inc.
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How a Propeller Works
Propeller Rake
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Propeller Repair

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rundquist Propeller Tools, Inc.

Propeller Rake

Propellers are all variations of helical forms, the pitch being the helix or distance that a blade would advance through a solid medium in one revolution. Thus a three bladed propeller can be thought of as three similar profiles each cut from the flight of a triple thread screw.

Rake in a propeller is the inclination of the blade forward or aft of the conventional position of 90 degrees or square with the propeller shaft.

A propeller can be thought of as an infinite number of radial sections in helical or spiral arrangement. In the basic type of propeller, one which has no rake, each of these lines on the pushing face of the propeller radiate directly outward from the shaft center and square or perpendicular to the p-propeller shaft. This is called 0 degree rake. A propeller can also have a forward (negative) rake or an aft (positive) rake.

Typical Rakes

Forward Rake - This design is used on outboard motors by various manufacturers.

 

0 degree Rake - Used on outboard, I/O's and inboards by all manufacturers.

 

15/16 degree Aft Rake - Used on outboards and I/O's by various manufacturers.

 

Parabolic Rake - Various rakes - 3 degree Forward through 35 degree Aft. Used for performance propellers by various manufacturers.

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Rundquist Propeller Tools, Inc. | Naples, FL 34104