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In less-precise days of years past, it wasn’t unheard of to see an outboard powerboat racer conjure up his inner blacksmith in a desperate – albeit ill-advised – prerace attempt to add cup to his propeller in search of more speed.
Almost all modern props have some degree of cup. Cupped blades tend to “grip” the water better than un-cupped blades – imagine trying to scoop ice cream with a butter knife instead of a spoon.
The engineering team at Mercury Propellers deploys software, knowledge and experience to optimize the cup profile on each Mercury prop model and achieve the best overall performance. Understandably, it’s definitely not recommended that you employ rudimentary tools to modify your precision-machined and perfectly balanced Mercury propeller. Instead, consult the Mercury Prop Selector Tool, a great resource that will help you narrow down prop options by answering five basic questions about your boat and engine, and how you use them. You’ll get a propeller that’s perfectly matched to your application.
But, in case you’re interested, cup provides a number of benefits. A cupped prop may slip less and thus be more efficient than a prop with no cup and may provide more lift to help get a boat on plane and hold it on plane at a lower speed. Cupping can also reduce cavitation on hole-shot acceleration. In surface-piercing applications, prop blade cup allows the outboard or sterndrive to run higher without drastically increasing slip.
In technical terms, cupping can follow either the pitch lines of the blade or the rake lines. When it intersects the pitch lines, cupping has the effect of increasing blade pitch, reducing rpm at wide-open throttle. If the cup intersects the blade’s rake lines, it has the effect of increasing rake, which can produce more bow lift. Boat owners seeking improved performance may ask a prop shop to add cup to a prop, but adding too much cup will significantly drop engine rpm and hurt performance. In short, just the right amount, in the right propeller, in the right rake/pitch configuration will bring out the best in your boat.
Because it sounds like a negative, “slip” might be the most misunderstood of all propeller terms. But slip is actually essential to propeller function. Propeller slip is the difference between the actual distance the prop travels forward through the water ...
Putting dual props on a sterndrive or outboard is like putting snow tires on a truck – it’s all about traction and transferring power to the water. Dual propellers were first introduced on a regular-production Mercury Marine® product in 1993 ...
Propellers for pleasure boats with outboard or sterndrive power are made from one of two materials: aluminum or stainless steel. Let’s look at the advantages each offers. Aluminum Props Affordability is the key advantage of an aluminum prop. The price ...
When considering propellers, many boat owners get fixated on speed. They assume a prop that will make their boat go faster must be better. It’s more important to consider how a propeller can impact the entire boating experience. Speed is ...
sOne key prop dimension is blade rake. In technical terms, rake is the angle of a propeller blade relative to its hub when viewed from the side. If the blade is perpendicular to the propeller hub, like the blades of ...
If you’ve ever shifted an outboard from neutral to forward or reverse gear, you know the sound and feel of “shift clunk.” It’s the noise created when freeplay in the drivetrain is taken up as the parts in the system ...
You’ll often be able to find these dimensions stamped right on the hub or barrel of your boat propeller. For example, a propeller marked as 14 x 19 has a diameter of 14 inches and pitch of 19 inches, always ...
Fishing pros like 2016 GEICO Bassmaster Classic champion Edwin Evers know it’s important to pull the propeller periodically to keep the propshaft splines lubricated and to check for fishing line wrapped around the shaft. It’s also important to reinstall the ...
Mercury Marine has implemented a new, industry-first dynamic balancing process for all of its mass-produced stainless-steel propellers that will result in perfect balance while preserving the engineered shape of the blades. A prop that is in perfect balance will not ...
