Rotation

 

 

left
This propeller is a left hand rotation
leftbIt turns counterclockwise

 

 

right
This propeller is a right hand rotation
rightb
It turns clockwise

Determining propeller rotation is by looking from the rear (AFT) of the boat forward to the front (BOW) of the boat.

The most common propeller is right hand (clockwise) rotation. The cutting or leading edge of the above propeller is on the right hand edge which is the lowest. The highest edge above is called the trailing edge. This edge may also have a rolled section which is called a Cup
 
 

counter

 

 

counter


Above: Counter rotation propeller rigs (both left and right hand propellers fitted)



dual


Above: Dual right hand propeller rig



duo

 

 

 

duo
Above: Volvo Duo Props

 



Book Suggestions

 Propeller Handbook: The Complete Reference for Choosing, Installing and Understanding Boat Propellers

How Boat Things Work: An Illustrated Guide

Speedboats (Fast!)

Drag Boats of the 1960s (Photo Archives)

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