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PROPELLERS 101 Where Power es Performance

It’s hard to overstate the importance of running the right propeller on your boat – whether you’re a top-notch professional angler or weekend recreation warrior. Your propeller is where it es together. Where technology meets the water. Where power es performance.

Understanding the basic science behind propeller design will help you understand their importance – and help you choose the Quicksilver prop that best suits your needs and meets your expectations on the water. For a richer, more satisfying boating experience.

How Propellers Work

The “Push/Pull” Concept

To understand this concept, let us freeze a propeller just at the point where one of the blades is projecting directly out of puter screen. This is a right-hand rotation propeller, whose projecting blade is rotating from top to bottom and is moving from left to right. As the blade in this discussion rotates or moves downward, it pushes water down and back as is done by your hand when swimming. At the same time, water must rush in behind the blade to fill the space left by the downward moving blade. This results in a pressure differential between the two sides of the blade: a positive pressure, or pushing effect, on the underside and a negative pressure, or pulling effect, on the top side. This action, of course, occurs on all the blades around the full circle of rotation as the engine rotates the propeller. So the propeller is both pushing and being pulled through the water.

Thrust/Momentum

These pressures cause water to be drawn into the propeller from in front and accelerated out the back, just as a household fan pulls air in from behind it and blows it out toward you.

The marine propeller draws or pulls water in from its front end through an imaginary cylinder a little larger than the propeller diameter. The front end of the propeller is the end that faces the boat. As the propeller spins, water accelerates through it, creating a jet stream of higher-velocity water behind the propeller. This exiting water jet is smaller in diameter than the actual diameter of the propeller.

This water jet action of pulling water in and pushing it out at a higher velocity adds momentum to the water. This change in momentum or acceleration of the water results in a force which we can call thrust.

How To Choose Pitch

Identify the make, model, year and horsepower of your engine Consult the owner’s manual to find the mended wide-open-throttle (WOT) RPM range for your engine. Using the existing propeller, make a test run to determine the current WOT RPM and speed. Vary the boat’s trim angle for maximum speed. The boat should be loaded as it would under “normal” operating conditions. A full tank of fuel is mended. If the current propeller isn’t within the manufacturers mended WOT range, select a propeller with a larger or smaller pitch using the following rules: Adding 1 inch of propeller pitch will reduce WOT RPM by 150 to 200 RPM. Subtracting 1 inch of propeller pitch will increase WOT RPM by 150 to 200 RPM If you’re upgrading from a three-blade propeller to a four-blade propeller, remember that many four-blade propellers generally turn 50 to 100 RPM less than a three-blade propeller with the same pitch.

STAINLESS STEEL PROPELLERS Quicksilver Stainless Steel Propellers

Stainless steel propellers offer outstanding durability & consistency:

Quicksilver propellers are the strongest propellers in the industry Patented aluminum alloys and stainless steel that is 30% stronger than petitors Tested under the most rigorous conditions for performance you can trust Paired with the industry-leading Flo-Torq II hub system, Quicksilver stainless stell propellers to increase the performance of almost any marine outboard or sterndrive.

ALUMINUM PROPELLERS Quicksilver Aluminum Propellers

Best performing aluminum propeller designs:

Better top speed and acceleration vs. aftermarket and even other original equipment propellers Industry-leading product development Top performance you want without sacrificing reliability Engineered and built by the world’s leading marine engine manufacturer

MANUFACTURING PROCESS Producing world-class Quicksilver propellers is no simple task

There’s nothing to producing a boat propeller right? Think again. Producing a world-renowned Quicksilver prop takes time and skill, not to mention advanced engineering and know-how.

Three dozen Quicksilver employees create some of the best props in the world. Every operation – from inception pletion – is centralized at Quicksilver’s propeller manufacturing facility in Fond du Lac, Wisconsin.

Quicksilver started producing propellers more than 70 years ago and today its propellers are revered around the world.

Manufacturing Quicksilver props starts with a 5,000-year-old process – investment casting – which requires specially engineered wax to create a prop mold.

The wax is warmed to 180 degrees and poured into a “wax press,” where a machine operator creates a pattern in the shape of the propeller.

Next, the pattern is dipped into two ceramic finishes. It’s initially dipped in a primary coating and left to air dry for two hours. Then it’s dipped four more times in a secondary finish that improves thickness and strength. In between each dipping, there is another five-hour drying period. After all five coatings are applied, the pattern is left to dry under high-powered fans for 24 hours. The entire dipping process takes more than two days.

Once there’s a strong, thick ceramic shell, the wax pattern can be removed. Each piece is placed in an autoclave where the molds are steam-heated for 18 minutes at 325 degrees Fahrenheit at 100 PSI of pressure. During the cycle, the wax melts and separates from the shell and is later collected and recycled for future patterns.

Next, the empty cavity, now free of most wax, is placed in a burnout furnace. Inside, the furnace reaches more than 2000 degrees Fahrenheit. It’s so warm, employees working near the furnace must wear aluminized clothing to deflect the heat.

The burnout furnace serves several purposes. It burns off any residual wax and strengthens the shell. It also prevents shock when melted metal is poured into the cavity in ing minutes. While the molds are in the burnout furnace, an hour-long process, 500 pounds of stainless steel is melted at 3000 degrees Fahrenheit.

After the shells are removed from the furnace, the liquid metal is poured inside the cavities from a ladle 50 pounds at a time. The process continues until all 500 pounds of melted metal are poured. Usually, that equates to 24 average propellers.

Shells are then cooled on carts for about an hour before they are transferred to the cleaning cell, where residual ceramic is removed using three types of equipment – a knockout machine (resembling a jackhammer), an abrasive saw and a sandblaster.

By pletion of the process, the prop is free and clear of residual ceramic or oxidation. It is the last step of the casting process.

Now that the prop has been cast, machinists take over. Quicksilver’s standard Delrin-sleeved props require minimal machining on the outside diameter of the hub. There is more extensive machining involved on props that counter rotate, like the Thunderbolt Bravo Three

Machinists have to work with the hub of the propeller and splines so the prop can affix to the prop shaft for these types of propellers.

Next, the propeller is transferred to the grinding department where grinders thin the leading edge of the blade and other areas of the prop that require sanding.

From there, the props go to the surface refinement area. For the next two hours, the props are placed in a drag finish machine to have their peaks and valleys sanded out of the propeller. The process creates a matte finish for some propellers; other propellers go through a second refinement stage – burnishing – which creates a high-luster finish.

Finally, the prop is transferred to the boxing area to be boxed and delivered.

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