![]() ![]() The Mercury Revolution 4 propeller also provides outstanding stern lift and is a proven performer on larger center-console boats powered my multiple Mercury Verado outboards. The result is often no loss in top speed or even a slight gain in top speed. The additional area of that fourth blade helps lift these boats efficiently on plane, will hold them on plane at lower speeds and can reduce hull drag. The four-blade Fury 4 prop was designed specifically for bass boats longer than 20 feet, especially when those boats have a “tournament load” of gear – all of the weight of tackle, back-up equipment, and full fuel tanks and livewells typically carried by tournament anglers. The three-blade Fury is suited for lighter boats with high-horsepower outboards. The two Mercury Fury propeller models offer a perfect example of the advantage of adding a fourth blade. That fourth blade also adds some drag, which might reduce top speed. Increasing blade area can improve hole-shot acceleration and increase lift at the stern. Four BladesĪdding a blade further reduces vibration, and usually adds blade area to a propeller design. It offers outstanding performance on lighter bass, bay and flats boats running high-horsepower outboards. ![]() The three-blade Mercury Fury propeller is one of the company’s most popular props and a great example of a premium three-blade model. Within that three-blade design, engineers can manipulate blade area, blade rake and cupping to build a prop that can perform well in a specific application – for instance, lifting the bow of a performance boat for more speed or lifting the stern of a heavy cruiser on plane. A propeller with three blades achieves the best balance of smooth operation and minimal drag through the water, which is why a three-blade design is the most popular for general boating. But with a single blade winging around at speed, the vibration would be intolerable. ![]() Technically, a propeller with a single blade would be the most-efficient design simply because it would produce the least drag in the water. Let’s look at how the number of blades affects propeller performance. Each design is intended to enhance overall performance in certain applications to make a boat work its best on the water. Which is one reason Mercury Marine offers a wide range of propellers, including models with three blades, four blades and even five blades. Speed is one element of that experience, but so are acceleration, economy, comfort and boat handling. It’s more important to consider how a propeller can impact the entire boating experience. They assume a prop that will make their boat go faster must be better. I also figured that since it's diameter is almost a full inch smaller than my current 4 blade that there shouldn't actually be much more drag even with the extra blade.When considering propellers, many boat owners get fixated on speed. The main reason I was considering the high five prop was the exellent reviews I have read about it especially when it comes to improved acceleration which is what I am looking for. I have read elsewhere of other people running the same prop that their prop also behaves like a higher pitch than it actually is. The lower unit ratio is 1.97, I finally came to the conclusion that despite my current prop being labeled as a 20" pitch it behaves like it has more pitch do to its design and lots of cupping. I thought the same thing last season and I am now confident that my tach is accurate and my speed has been verified using multiple GPS and is within 1MPH of the speedometer on the boat. Thanks for all your replies, in response to steelespike I agree that there is something odd going on with regards to prop slip being negative.
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