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Mariner Outboard Propellers: Terms Used to Describe Blades

Novice boating enthusiasts may not realize the complex nature of a propeller blade, but those who have enjoyed their motorized boats for months or years have usually come to understand that outboard boat props are quite complicated.  As such, they require precise engineering to render them into the correct shape that will have ideal characteristics for moving through water and propelling a boat.  The makers of Mariner outboard props know that each dimension must be exact, and when it comes to the complex geometry of the blades, these dimensions go far beyond simple considerations of height, length, and width.

Parts of an Outboard Propeller Blade

A knife blade is usually a completely flat surface, but propeller blades have large and sometimes subtle curves worked into them in order to provide optimal performance.  The “suction side” of a propeller blade is usually referred to as the blade back.  Another way to think of it is as the forward side; this means that the blade back will be facing towards the bow of a boat.

The opposite of the blade back is the blade face.  This can also be thought of as the pitch side or the pressure side.  This back (aft) side will be facing towards the stern of the watercraft on which it is mounted.

Blade number is a term that simply refers to the number of blades a particular propeller possesses.  Common blade numbers are three and four.

The blade root on Mariner outboard propellers is the spot where the blade is actually affixed to the hub of the propeller.

Understanding Propeller Function

It is true that boating enthusiasts do not have to understand how a propeller works in order to use one very successfully for activities as diverse as cruising a river or lake, getting to a favorite fishing spot, or pulling a water skier.  Knowing the principles involved in propeller function, however, can make a novice boater into more of an expert so that during the next shopping trip for aftermarket Mariner boat propellers, he or she will know what to look for and what to ask.

Basic Propeller Physics

Mariner boat propellers, like all propellers for outboard motors, operate on a simple physical principle known as “push – pull.” Ordinary household fans operate on the same concept, which makes sense since the blades of a fan bear a great resemblance, in fact, to the blades on Mercury props.

In a fan, the rotation of a curved blade causes air to be drawn in the back of the unit and then pushed out the front at great acceleration.  A boat motor propeller works on the same idea, only with water instead of air making its way through the system of rapidly rotating blades.

How Propellers Produce Thrust

In a boat propeller, the water exiting the system is called the water jet.  Thrust is produced because water is pulled in at one speed, but the water jet is ejected from the propeller blades at a much greater speed.  To balance this differential in force, the boat is pushed forward through the water.