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Updated: 03/13/2014 02:59:30PM

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()fl-boat-thefts-photo1c---- A missing Lower unit on a mercury engine belonging to Renee Radabaugh of Delray Beach. Carline Jean, Sun Sentinel

mechanical mojo • tony towns

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There are quite a few things you need to consider when choosing the correct propeller.

First, lets cover some basic prop lingo. What do the numbers mean? Let’s say the size of the prop is 13½ x 15. The first number is the diameter of the prop in inches, meaning the distance from the center of the prop to the end of one of the blades, then doubled. The second number is referred to as pitch. Pitch is the theoretical distance in one revolution the prop would move in a forward direction. This means a 15-pitch prop would move 15 inches per revolution.

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