Here are the factors you should look into to figure out the correct rpm you need . The blades are twisted so that they push water toward the rear as they turn. Racks, Fish Finders, Sounders Aluminum propellers offer boat owners many advantages. Hardware, Boat Seat Stainless steel has five times more stress tolerance than aluminum, which means the blades of a stainless steel prop can be much thinner than those of . In general, whatever percentage of rpm you want to increase or decrease, make the same corresponding percentage adjustment in the pitch up or down. This can cause excessive drag which lowers the performance of your boat. So, if you are getting 6,000 with the 11" and a full load, I think you could go to the 12" aluminum wheel. Kinda stuck on what to do.. My 14 X 17 Aluminum prop did 5,600 rpm at 34 mph. Deals, Electronics Also, to get a maximum rpm, the prop has to match with the engine power. These propellers offer better performance and will last longer than an aluminum propeller. If your chances of hitting a submerged object are low, an aluminum prop is an all-around inexpensive choice. If your prop has too much pitch (see "A Few Important Definitions" below) like the one above, the engine will have a lousy "holeshot" the ability to jump up on plane quickly and will lug (or drag). AN Make sure that shop is reputable, preferably a member of the National Marine Propeller Association, the only organization in the world that provides training and certification for the propeller-repair industry. You should replace your boat propeller if its damaged or has worn-out blades. Subscription to the print version of BoatUS Magazine, 4% back on purchases from West Marine stores or online at WestMarine.com, Discounts on fuel, transient slips, repairs and more at over 1,200 businesses, Deals on cruises, charters, car rentals, hotel stays and more. Its essential to inspect the propeller regularly and replace it if its damaged. Holders, Cabin Accessories & By continuing to use our website, youre agreeing to our cookie policy. Ken, I got my boat in the water today with the new prop you sold me. When choosing a prop, keep in mind you will need the correct diameter, pitch, and hub style for your engine. 16 Best Kayak For Beginners 2023 - Kayaking Adventure Gear, 15 Best Baitcasting Reel Under $100 2023 - Improve your, 17 Best Trolling Reels 2023 - Enjoy your Fishing Adventure, Heavy Duty Fishing: 11 Best Rods And Reels For Big Fish 2023, 12 Best Prop For Mercury 115 4 Stroke 2023 - The Motor, 12 Best Prop For 25 Johnson 2023: For Better Performance &, Is Larson A Good Boat? A good prop shop won't leave that behind. The Michigan Wheel Rapture is a three-blade stainless steel propeller. The properties of stainless steel result in a propeller that offers more performance and more durability than an aluminum prop. Hardware, Marine Depending on how you use your boat and its current performance, you might be wondering if you should "pitch up", "pitch down", switch from aluminum to stainless steel or move from three blades to four. When the trailing edge of the blade is formed or cast with an edge curl it is said to have a cup. Boat Gel Coat - Spectrum Color, Pumps and & Live Bait While its true that you will need to shell out over two hundred dollars for a 3-blade stainless steel prop versus over a hundred bucks on other kinds (e.g., aluminum), what youll be getting is value for money as the stainless steel prop is longer-lasting, gives you speed and fuel efficiency, and better handling. Software, Digital & Dock, Anchor Chains & Original prop: Mercury Black Max 13x19p aluminum. This prop is commonly purchased with the Quicksilver Flo-Torq II hub kit. Ski, Wakeboard Stainless steel doesnt flex as much as other materials, so it will give greater control at top speeds. Pitch and slippage: Pitch is the distance a prop moves through the water in one revolution. Since then the rpms have dropped to a max of 3900-4000, instead of the 4200-4600 they should be. Carefully inspect stainless props and look for hairline cracks, especially in the leading and trailing edges. Its tuned vents allow quicker holeshot, while its progressive pitch angles help minimize slippage and promote fuel efficiency. If your prop has too little pitch, the engine can rev past its red line, which is like driving your car on the interstate in second gear. Test for Maximum RPM (see image 3) Using your existing boat propeller or a new propeller, make test runs to determine the maximum RPM and boat speed. Stainless steel propellers are more than five times more durable than aluminum propellers. Similar to its 3-blade counterpart featured earlier, this 31501731 series is made from 15-5 stainless steel and promises superb handling and further boat lift through its cupping and aggressive rake. your boats Gel Coat Match, Shop Switches, Shore Power & AC I recently put on a stainless prop with the same 15" diameter by 17" pitch as me aluminum prop. The smaller horse powered engine will give you lower power to rotate the propeller. And for sure, youd want no less than the props that have been tried and tested. It is light at only 10 pounds and comes with a horsepower of 135 and 115-225. Dailymotion, Tubes, Shop & Blade anomalies are revealed by variations in blade tip clearance as the prop is turned. Continuous running over WOT will soon damage an engine. 1) What would it achieve? Pitch is the inches of distance the prop moves forward in each 360 degrees revolution. As for a "conversion calculation" between aluminum and stainless, there is not one. If you are currently using an aluminum prop, change it to a stainless steel one. He is a member of the National Association of Marine Surveyors, he's on ABYC tech committees, and has a 100-ton U.S. Coast Guard license. The trade-off is that stainless steel is more expensive than other materials. Accessories, Marine DC Power Plugs Category, View Kits, Seadog Stainless Steel Cup Will a stainless steel prop increase speed? When I changed to the 12" pitch prop, the rpms dropped to 5,900-6,000 and I got a bit more mid-range and top end speed. (Nibral and stainless-steel propellers may be salvageable.) Don't over-trim. Previously we summarized the matter that rpm is actually determined by the engines WOT. Downs, Couplers, Mounts, Harware, Marine Nuts, Bolts, & Boat, Boat Buyers All blades look the same and there's no obvious damage but one or two may be completely out of "index," which is the spacing between blades, or "track," the relative height of each point. They can also add cup to the trailing edge of the propeller to increase pitch slightly and decrease engine RPM's, while increasing speed. For the top speed of a boat, RPM matters. Results of hitting a rock or a hard place. Re: Change pitch on stainless steel prop? Now, Shop Acessories, Fish Cleaning Much like bikes that are hard to pedal. I completely empathize with you if youre perplexed. A stainless steel prop will certainly increase the speed of your boat. Platforms, Slide Will stainless prop increase speed? The rpm difference between aluminum and stainless steel prop is that SS prop has lower rpm. Which ultimately damages your boat. . It can also be brought about by obstruction in the water flow due to parts of the hull or running gear positioned too close to the propeller itself. But the rpm is mainly determined by the engine WOT. Example of pitting from corrosion that has damaged this prop beyond repair. High Back Reclining Helm Seat, Cabin and Check out this overview on the Mercury Enertia: To recap, will a stainless steel prop increase speed? SS prop being a tough material, sustains more damage. Hardware, Boat Cabin This page was generated at 02:32 AM. Yes, you can switch between aluminum and stainless steel propellers on the same boat. Consider this: a typical 3-blade stainless steel propeller runs around $350+. By continuing to use our website, youre agreeing to our cookie policy. Here are some of the things to look for. Its essential to inspect the propeller regularly for any signs of damage and replace it if necessary. Covers, Boat Shrink Wrap Due to the material of the aluminum prop, its cheap and light to manufacture. Parts, Boat Tubing & 9 Sep 19 Kevin Donahue Prop Talk Better, faster, stronger, and more fuel-efficient. A great prop should make your boat go faster with more efficiency. Any practical boat owner knows to change the engine oil, swap out the impeller every year or two, and change worn belts before they break. In the 9 years that I have owned the boat, I have hit 40 mph just a handful of times. With the thin blades and tough material, SS prop will hold well in tight turns. Youre looking to increase your boat performance. At high speeds, it provides better control and less flex. This Enertia model is the first propeller to use the new X7 patented alloy for added strength and durability. As you can see from my previous post above, my boat had an aluminum 14.5 X 19 Quicksilver prop and I was maxing out at about 4400 RPM and achieving 40 mph with favorable conditions (with the current and with a tail wind). All rights reserved 2023 Copyright BoatingGeeks.com. Video, GPS Chartplotters & Rollers, Boat Trailer Remember: Using others' images on the web without their permission may be bad manners, or worse, copyright infringement. Along with other factors, pitch and diameter will impact the rpm of the prop. Winches, Boat Motor Supports & An aluminum prop is much cheaper, but is weaker and tends to flex under pressure causing the pitch to change. Props made of aluminum are another popular metal used for propellers because they are highly affordable. When a propeller hits a hard object, it can sustain damage that can affect the engines performance. A trip to the . Boarding, Paddles & You can smooth out those areas yourself with a file, but be careful not to grind too much. Plumbing, Fresh Water Boat A stainless steel prop will give your boat better fuel economy, performance, and is more durable than an aluminum prop. A metal propeller soaking in saltwater (or any other electrolyte) can suffer a form of corrosion that appears to "eat" away the metal, leaving it pitted where some of the alloy has left the metal structure. Shelters, Boat Pumps, Livewell Aerator Pumps Many features may not work properly without it. Stainless steel boat propellers are manufactured in all the same styles that aluminum propellers are manufactured. Yes, the number of blades on a propeller can affect boat performance. Towers, Tow Ropes & An optimal outboard propeller will maximize your boat's performance while allowing your engine to operate in the recommended RPM range. Hence youll see lower RPM of the propeller. You say you want to go faster? A super-simple test to detect obvious blade discrepancies consists of firmly and steadily holding a ruler or even a screwdriver (tip down) vertically above the prop and against the hull bottom while turning the prop. Maintenance, Pumps and A. Charles Fort is BoatUS Magazine's West Coast Editor. PFDs, Roof Racks, Carriers, A prop with an 18-inch pitch would move 18 inches through a solid medium with each complete rotation. On aluminum props, you may see black "pot metal" filler or porosity from a welding repair, areas that are prone to failure. So why didnt your boat come with the right prop in the first place? Distribution, ProMariner ProNautic In tests, the speed can increase a 3-4 mph on a 150 hp outboard motor. The two dimensions of a prop have different effects on performance. You've probably seen this if you've looked at used boats. Ken, I got my boat in the water today with the new prop you sold me. A dinged and bent prop can rob you of 10% of your fuel costs. Accessories, Boat Lift Canopy While stainless steel propellers are more costly than their aluminum counterparts, they also lead to better boat performance and increased fuel economy. If you want to purchase a backup propeller you can always purchase an aluminum one that is less costly. Often, they're all worn evenly. Meaning, its slightly more difficult to rotate yet gives you increased speed at the end. Worn blades, for example, cause high rpm and prop repair solves many rpm problems, but it's not uncommon for boats to have improperly sized props in good condition, especially as boats get heavier, motors get weaker over time, and boat owners fiddle with diameter and pitch to resolve perceived or real performance problems. It's hard to see this, which is a good reason to have your props checked every time you haul your boat or when at your dealer for regular service. If too much is gone, especially on aluminum props, it's often best to buy a new one. Boat Salvage Yards [Best 16 Yards in the U.S. and Canada], How Much Is a Jet Ski? The biggest advantage is not top speed but responsiveness in all throttle ranges and bite on turns. They can also advise as to whether you might need a prop of a different diameter. Hence, stainless steel props are more efficient. Screws, Boat Handles, Pulls, Anchor Box Anchors, Fishing Rod & Reel Protection, Dock Storage & Pumps, Marine Pump Replacement This chartplotter/fishfinder provides crisper views of fish movement and structure, and a real-time look at how your lures and techniques are working. Other popular alloys are aluminum, bronze, and nickel. Honda 5hp Outboard, Boat My speed has also dropped. Stainless steel propellers can withstand high speeds and may be used on high-performance and heavy boats alike because of its strength, durability, and resistance to harsh environments. It provides faster acceleration, an average of 2 to 3 knots more than other alloys. A stainless steel propeller is worth considering for improved acceleration, top speed, or all-around performance. It gives better control and less flex at top speeds. These blades also are thicker and not as sharp or strong as as stainless steel. Copyright 2019 IBOATS. Virtually no rocks. Aluminum is more pliable and therefore aids in protecting drive components by readily cushioning impact energy. This alloy material is a combination of aluminum and bronze, and for added strength, nickel. Good luck choosing the perfect propeller for your boat, and have fun out on the water! Professionals. Composite props are in the same price range as aluminum, but some brands can be found for less. Stainless steel props are also better for abrasive environments. A stainless steel prop will certainly increase the speed of your boat. Posts: 150. These types of propellers, due to their expensive price tag and unique hub connections are less common than standard aluminum propellers. Helm Seats, Shop So in our example, the prop tends to actually move a bit less than 12 inches in the water. Posted 1310406624. The life expectancy of a standard stainless steel propeller is much longer. The downside to a stainless-steel prop is that it costs substantially more. They're easily distinguishable from original part numbers. Three vent plugs are included, allowing you to fine-tune its holeshot for better performance. A simple inspection makes your drive train last longer and gives you one less thing to worry about as you enjoy the pleasures of boating. In contrast, a high powered engine will give a high maximum RPM. Without it, the prop couldn't move the boat. Now, after knowing all these considerations, including the fact that a stainless steel prop increases speed, you are now ready to do your shopping. A props up and down rotational motion, aka pitch, pertains to how far through the water it moves in a revolution. For example, if you have a higher diameter, you may want a lower pitch prop to even it out. As of April 2nd, boatless for the first time in many years. Rails, Marine Tools & Tool Reply with quote. After I got my first job, I purchased a Kawasaki jet ski. Most props so afflicted can be repaired, but if you don't fix it, you'll end up losing the blade, damage that cannot be repaired. The answer is yes. #1 Hi All My name is sevki and I am from Turkey. This is pretty easy to identify. OK that makes sense. Drink Holders. If your URL is correct, you'll see an image preview here. Please enable JavaScript in your browser settings. The negative is that they are more difficult to repair than stainless steel if damaged. The 15-5 stainless steel makes it stronger with age. My stainless steel Raker 13.5 X 20 prop does 5,200 rpms at 42 mph same day gps testing. It is a right-hand rotation propeller with 3 3/8" diameter vent holes. While prop makers today deliver accurately sized props, there is still much that can be done to fine-tune them for a particular application. Plumbing, Anchor Along the way, this guide will look at the life expectancy, cost, advantages, and disadvantages of each type of propeller. [New and Used Jet Ski Prices], Kayaking in Ohio [Best 13 Places to Kayak in Ohio], Sit-In vs Sit-On Kayak [Difference Between Sit-On-Top vs Sit-In Kayaks], It gives better control when at max speed, You can see a better holeshot (meaning you can easily get up on a plane and catch speed from a stop position), Even at top speed, youll experience less prop flex. You may need to replace the prop, but it wont damage your engine. Jim. And pitch effects rpm level. Hence, theres no fixed number to differentiate the rpm difference between aluminum and stainless steel prop. Inboard applications, with myriad gear reductions and engine rpm, are a little trickier to compute. Fishing Lures, Fishing Rod Holders & Usually, to address this issue, the use of three blades is the alternative, but nowadays, four blades have become another option. Heres a table to show you the differences between high pitch and low pitch. There are several versions of this. Best to let a professional handle that. Know The Ins And Outs of This Popular Brand, 11 Best 2 Kayak Roof Racks 2023 Secure and Easy Transportation, 10 Best Inflatable Kayaks In Canada 2023 Unleash Your Adventurous Spirit, 10 Best Folding Canoes 2023 Unfold Your Adventure, 12 Best Bass Boats Under $20,000 2023 Catch Your Prize, 5 Best Places to Go Kayaking In and Around Houston, Texas, 10 Best Saltwater Fishing Boats Ultimate Angling Adventure, 10 Best Inflatable Kayaks For Ocean in 2023 Ultimate Guide to Adventurous Aquatic Thrills, 5 Best Outdoor Kayak Storage Racks 2023 Secure Your Gear, Intex Explorer vs Challenger Which Inflatable Boat is Right for You, 4 Best Places to Go Kayaking In and Near Washington, DC, 11 Best Kayak Bimini Tops and Canopies 2023 Stay Dry and Shaded. Here are 12 tips that will definitely freshen things up. The typical compromise is three blades, although four blades are becoming increasingly more popular. Grills, Boat Drink This now-vital tool in marine safety and national security could someday be used to track recreational vessel location and speed. Tackle Boxes, Fishing Bait & Yes! A props diameter, size, or span is an essential element that determines how powerful the propulsion is. Along with other factors, pitch and diameter will impact the rpm of the prop. A general rule of thumb is that a 1-inch pitch change will result in a 175 to 225 rpm change at WOT. To see where a metal stands in the order of cathodic to anodic elements, check the galvanic series chart, which lists metals in order of their nobility with the least noble at one end and the most noble at the other. All of the visual symptoms identified so far can cause the rpm to be too high or low. The latter are less likely to be damaged but are more expensive to repair. If you happen to damage your current propeller and have to purchase a replacement quickly from a lakeside repair shop, chances are they will have an aluminum propeller in stock. If you end up striking something with a stainless steel propeller, chances are your propeller will be just fine. A good prop shop can adjust the pitch on most props up or down about two inches depending on the material. Award-winning BoatUS Magazine is the official publication of Boat Owners Association of The United States. Registered: 1223655940. Stainless steel props are relatively more expensive than the other kinds, but they will save you fuel costs due to their efficiency in the water. After all, prop blades are shaped in a twisted way or turned to push against the air or water. The Quicksilver Thunderbolt fits most stern drive motors and 135+ hop outboards through the appropriate Flo Torq II hub system, and its large span design works well across a broad range of applications. Look more closely and you'll see edges where the old paint ends and new paint begins. Also, for excellent stainless steel prop, take a look at our top pick, the Turning Point Propeller 31502112 Express Right Stainless 3-Blade: A stainless steel prop will increase the speed of your boat. Quicksilver makes a great propeller, here is an example of a 4 blade option you can use on your outboard or MerCruiser inboard outboard engine. Given that youre already thinking of buying a new stainless steel prop, Ill give a quick review of certain points that you need to consider when choosing a propeller for your boat. It is definitely the most stable at that position, but it still is out of control. So Ken, what is it that makes you think I should go down to a 16. All, Anchor & My stainless steel Raker 13.5 X 20 prop does 5,200 rpms at 42 mph same day gps testing. Even worse, a bad prop may look fine to the eye. With a bronze alloy prop, which is an alloy that can contain copper, lead, tin, zinc and other elements, less noble metal can be stolen (leached out) from the alloy and taken to another metal. 2010 Sea Ray 205 Boston Whaler dauntless 15 W/75 merc 14' Shakespeare Wondercraft W/Merc110 17' Gheenoe W/Johnson 4.5 Other assorted watercraft, Prop pitch and selecting just a SS prop, even between competing brands can be a 'trial & error' scenario! Detectors, Binoculars & 4 blade option you can use on your outboard or MerCruiser inboard outboard engine. The main disadvantage would be flex of the blades. I've got a l984 23' Proline walkaround cuddy with 3.8 v6 OMC I/O. Bilge Pumps, Shop The answer is that if you can afford it, you should always go with a stainless steel propeller. For instance, a propeller with a 12-inch pitch is supposed to move 12 inches through a soft solid after each full rotation. As a rule, a stainless-steel prop (assuming the correct pitch and diameter) will make your boat go faster up to 2 to 3 knots on some boats. Ignoring tiny nicks in the propeller edge is a big deal. Higher the pitch, faster the top end speed and lower the revolutions. More than that usually requires a new propeller. Biminis, RV & Trailer All the blades look the same, so what's the problem? The advantages of the Rogue prop are many one of which, it does not lose RPM as compared to a same pitch3 blade prop. Yet, SS prop will give you higher top end speed with lower revolution. An aluminum prop is much cheaper, but is weaker and tends to flex under pressure causing the pitch to change. Anybody out there have a prop that perfoems well with this type boat? Look for blades that aren't naturally rounded at the tip or are worn to a point. It gives better control and less flex at top speeds. What is propeller cupping? A propeller with more blades will provide better low-speed handling, increased thrust, and improved acceleration. In the event you damage a stainless steel propeller, you will be able to get it repaired for between $125 to $200. Hardware, Boat Trailer One is the "spray can recondition." Trailer Winches, Shop The choice of the propeller depends on the boats weight, engine type, and performance expectations. Stainless steel is stronger and can be made thinner, which allows more speed. Now that the advantages and disadvantages of both types of propellers have been explored and discussed, it is time to answer the question every boat owner is wondering: which type of propeller is better. It provides faster acceleration, an average of 2 to 3 knots more than other alloys. Logically, the bigger the propeller, the more forceful is the thrust, and larger amounts of water are moved. The rpm difference between the two types of prop material is, in fact, confusing. Seats, Fishing Boat Axles, Boat Trailer Tie I'm surprised that there isn't more information on line about how to recalculate the pitch. Stainless steel is stronger and can be made thinner, allowing more speed. Boat - SeaArk 1860VPLDCC, All aluminum, aluminum floors, 55lb minn kota on bow, 12 gallon fuel tank in center console, cranking and trolling battery in back. Diameter and pitch are interrelated, and sometimes getting the right prop for the best efficiency is as much art as science and might require trying several different props. Or if youre looking at high performance race boats or heavier weight boats. The properties of stainless steel result in a propeller that offers more performance and more durability than an aluminum prop. The larger the diameter, lower the rpm. Holder, Anchor & Dock You probably have come across some of the old Formula's. So heres the run down: First of all make sure the motor is high enough on the transom: The anti ventilation plate must be clearly visible above water when on plane! Thanks. The question is, where do you start? This makes them ideal for boats that need extra power, such as racing vessels or commercial fishing boats. General Characteristics of a Boat Propeller With the gist, you know that the rpm isnt the only deciding factor for choosing props. If youre using a small prop with a high HP engine. This prop promises improved acceleration and top speed on most deep boats controlled by outboards with high horsepower. Maintenance, Fiberglass & Epoxy By jacking the engine this prop also has superiorgrip property when compared to a 3 blade prop of the same size. Locks, Boat Deck Bronze propellers can develop a pink tint that is a symptom of the "theft" of anodic metal in the bronze alloy and, when you rap a blade, instead of a resounding, bell-like "ding," you'll hear a dull "thud." Deals, Trailering Hole shot is the time it takes to go to a wide open throttle from a neutral position. Since then the rpms have dropped to a max of 3900-4000, instead of the 4200-4600 they should be. Our star for today is the stainless steel propeller. Best to work with pitch first and adjust diameter only as a last resort. Stainless steel also flexes less and keeps its shape at higher speeds. Furniture, Boat Seat Pedestals & A boat used to pull skiers or one that is loaded down with weekend gear will require a different prop than a boat used for zooming a couple of fishermen out to a fishing spot. The only option is to replace the propeller. My 14 X 17 Aluminum prop did 5,600 rpm at 34 mph. Choosing the wrong prop or continuing to use a damaged prop can decrease boat performance, increase fuel consumption, and potentially damage your engine and transmission. This, in turn, can cause detonation, piston seizure, and other engine damage. Every inch of movement is actually equivalent to 200 RPM. If youre wondering what are the best stainless steel props out there on the market, here are some highly recommended products for you to choose from: This 3-blade propeller by Turning Point has a size of 14-1/4 x 21 and has a left-rotating version. I guess at age 56 I'm becoming an old timer. Zincs, Generator We only boat on a river and the bottom is sand and could run into the ocassional log. I've worked on cars my whole life, and I have redone this boat from front to back. It's like starting from a stoplight with your car in third gear not only will it take much longer to accelerate, the engine has to work hard at low speeds, which places a tremendous load on the pistons, crankshaft, and bearings. Hardware, Boat Seats by The biggest advantage is not top speed but responsiveness in all throttle ranges and bite on turns. 3) What prop would I most benefit from? Facebook. A lot of props slightly cavitate in the course of normal running, but when this is overdone, it can ruin the blade surface of the propeller after the microscopic bubbles on the blade dissipate. Tops, Other Biminis, View Any thoughts? Its condition determines how fast you go, how much fuel you burn, how long your engine will last, how smoothly your boat rides, how quickly you pull a wakeboarder out of the water, and perhaps even if you'll get back to the dock at the end of the day. If your engine cant get to within 100 to 200 rpm of rated wide-open throttle (WOT), you probably have a prop issue, assuming your engine runs fine and minimal growth on the hull. For better speed and efficiency, prop blades need to be as thin (though sturdy) as possible. If you are skilled at driving your boat, an aluminum propeller should last you quite a while. Which material is best for a prop? Too high of pitch prop can cause cavitation which would be the boat equalizing to burning out in a car. Login, Boats It . Larry Carlson at Black Dog Props in Stevensville, Maryland, which uses computers to diagnose and repair props, says that 80% of the propellers on his shop floor look healthy. If you know the design diameter of your propeller, you can eyeball its actual dimension by measuring from the center of the hub to the tip of one blade (the radius) and multiply by two to get the approximate diameter. The frequency of replacement depends on how often you use your boat and the water conditions. Its important to choose a propeller thats suitable for your boats weight, engine type, and performance expectations to optimize fuel consumption. All times are GMT-5. Props made of composite material are the typical choice among boaters who want to upgrade their props from aluminum in a less costly way. Accessories, PWC Parts & This pushing is what propels the boat forward in the water. Lets see how they differentiate. Solas also makes a great propeller. The disadvantage to SS props is their price. Parts, Rule 1500 GPH Automatic Diameter: An important factor in thrust the larger the diameter of the prop (everything else being equal), the more water that gets moved. This feature also allows the prop to have a soaring top-end speed. Which are often quite affordable to buy and replace. That's a sure sign that somebody's trying to hide something. Communication, Auto Pilot Wells, Toilet & Waste The narrower blades of a stainless prop can reduce drag in the water. They are a little easier for the engine to push. Quicksilver is another great brand, here is one of their 3 blade thunderbolt models. You'll alter the blade geometry and kill efficiency. These three characteristics are the number of blades, the diameter of the propeller, and the propeller pitch. For everyone else reading this, it was a Quicksilver Q3 14.75 x 16 pitch. Storage But those otherwise "healthy"-looking propellers typically have differences in pitch of 1/2inch to 3/4 inch. We use cookies to enhance your visit to our website and to improve your experience. This guide will take a look at the various characteristics of both aluminum propellers and stainless steel propellers. Many stainless-steel props are heat treated to improve strength, a process that can make them brittle and susceptible to cracks. Most prop shops do inspections for little or no charge. For a better experience, please enable JavaScript in your browser before proceeding. The distance in inches across the circle made by the blade tips is the diameter. However, unlike some aluminum props, almost all stainless steel propellers utilize a hub design. In general, whatever percentage of rpm you want to increase or decrease, make the same corresponding . A repaired prop isn't a bad thing but it's something you should notice so you're not disillusioned when something that looks good goes bad. They will shear or bend, but the shock will not transfer to the other components. 12 months ago ProjectSports. However, it may have a lower top speed than a propeller with fewer blades. Vinyl, Floating Boat Systems, Marine Plumbing The vehicle for this transfer is the "electrolyte" and, in the case of a boat, that is saltwater or brackish water. But physically, SS prop will look unharmed. Because i had podded a hull that originally had a inboard in it and found after shifting locations and different water conditions that it was a tad light on up the front ,. The propellers diameter and pitch should also match the engines WOT to get maximum RPM and top speed. Can I have the prop repitched down an inch or so to bring up the rpms, and how much of a job is this? But too much or too little slippage reduces efficiency. Stainless Steel Props. While damage can still occur to your boat if you strike debris underwater, most of the time with an aluminum propeller it simply damages the propeller itself. Will a stainless steel prop increase speed? Those nicks can create stress risers, areas that are more prone to crack as the propeller blade works through the water. A boat dealer can help you pick this out, but they are typically cheaper to purchase online. I've still got weeks to go before I get on the water. In the propeller industry, these are the two most common options a boat owner can purchase to outfit their boat with, but which is the better choice? So it can be a good choice for areas where the prop is prone to damage because of shallower waters or debris in the water. A propeller thats too small or has a high pitch can cause the engine to work harder, resulting in higher fuel consumption. Notice that having either too little or too much pitch can cause engine damage. A bent blade or nick will severely affect performance and could even damage the engine and transmission. Parts, Inflatable You might see little bends or nicks in the blade tip edge or scratches in the surface. Paint worn evenly is also a clue. Financing, Iboats Compare this to around $110 for an aluminum prop. About UsI have been into boats and watercraft ever since I was young. Its best to consult with a boat propeller specialist who can recommend the best propeller for your specific needs. Also just an FYI, a stainless steel prop is also referred to as a ss prop or stainless prop. Diameter and blade area are two of the most critical aspects of propeller design. Yes, a propeller can affect fuel consumption. Cavitation is a phenomenon that occurs when the pressure on one side of the propeller blade is low enough to create a vapor bubble. YouTube, Stainless steel also flexes less and keeps its shape at higher speeds. Fasteners, Boat Windshield Tables, Minn Kota Products, Carbon Monoxide & Change your propeller. It provides excellent acceleration, stern lift, and propulsion, especially with its high rake blade and large cupping. Their only downside is they tend to cost more than their aluminum counterpart. But it doesnt give you higher top end speed. When choosing an aluminum prop, keep in mind you will need the correct diameter, pitch, and hub style for your engine. Other variables affecting the boat's speed include the design of the hull, the boat's waterline length, load distribution, and the type of . It's possible it did, but the prop could have been changed later. Check out this Solas HR Titan review: Another product from Turning Point, this 4-blade prop weighs 14 pounds and is available in left and right rotating models. Being a light material, Aluminum prop flex under power. Another factor affecting this process is the bonding system of the boat or the anodic protections. And naturally youre looking to up the rpm of your props. So, take a peek at your propeller. Means at the end, it wont give you increased speed despite the high RPMs. It is simply important that you know about aluminum propellers, their performance, and what you can do to improve their lifespan. Riptide Terrova 80 Trolling Motor w/i-Pilot & Bluetooth, Inflatable You should also measure the propellers diameter and pitch to ensure that they match the engines WOT. Any thoughts on rpm difference from aluminum to ss assuming all else is relatively equal? If you can drive your boat well, then you will be able to make your aluminum propeller last quite a while. Meters, Marine Electrical Panels Also, a boatbuilder doesn't know how or where you will be using your boat, so he or she often uses a compromise prop. Deals, Paint & Maintenance All that shiny paint looks great, so the prop must have been just repaired or might even be brand new. However, a stainless steel propeller can indeed boost your boat's speed, but it will depend on many variables. Here are some specs on my setup: 2015 Ranger RT188 2015 90HP Mercury 4Stroke EFI, 2.07:1 gear ratio WOT RPM Range: 5000-6000 Observed WOT RPM with old prop: 5600 Observed WOT RPM with new ss prop: 6400-6600 No jack plate Current prop: Solas New Saturn 13x19p SS. Rafts, Paddle Its a little hard for the engine to turn the SS prop. Look for repair numbers stamped on the prop. Caulking, Marine Engine So, Whats the rpm difference between aluminum and stainless steel prop? Many stainless-steel props are heat treated to improve strength, a process that can make them brittle and susceptible to cracks. A boat service center can help you pick this out, but they are typically cheaper to purchase online. The diameter of a propeller is measured from one blade tip to the other blade tip that sits reflected over the center of the propeller. & Rings, Prop Nut Kits & Diameter can also be adjusted to influence rpm, but outboard props are typically designed with specific diameters that work well with each pitch, and maximized diameter is almost always critical. I have a F115 on a 24 footer. The engine matters, the water matters. Vary the trim angle for optimum performance. If you are only able to afford an aluminum propeller for your boat, that is fine. Plan on fixing or replacing that prop before you run the boat. Mostly utilized on early boats, these props are still around even at present like in ski boats primarily because they are rather durable and flex minimally. 2023 Boat Owners Association of The United States. All rights reserved. But to further help you examine your options, well briefly show you the other players out there so you can better appreciate how they are different from their stainless counterparts. Before reading on, you might want to check out this YouTube video: Propellers rotate either to the right or clockwise or to the left or counterclockwise. Sockets, Marine Electrical See this review on the Turning Point 3-Blade propeller: This 3-blade Thunderbolt propeller from Quicksilver comes in left and right versions. The first place to look is the prop. A propeller thats too large or has a low pitch can also decrease fuel efficiency by causing the engine to run at a lower RPM. Motors, Fishing Downriggers & Wear makes them sharp. Accessories, Electronic Navigation Plus 3 Driver Tips. & Circuit You most appreciate the importance of your outboard or sterndrive tilt and trim feature when it fails. These propellers are more commonly utilized in freshwater situations and provide several advantages. A prop shop can add more pitch or recommend a new prop. A different tone may indicate a serious problem. As a rule, a stainless-steel prop of the same pitch and diameter will make your boat go faster up to 2 to 3 knots, on some boats than an aluminum prop. Missing material causes higher rpm and diminished efficiency, potentially damaging the engine at worst, and slowing the boat and using more fuel at best. Whether you are looking at a stainless steel or aluminum propeller, you will find three characteristics that define the propeller, its construction, and performance. Check out the video below, which explains in detail the Flo-Torq II. Most props can have the pitch adjusted at a prop shop, which can save you from having to buy a new one. Kits, Boat Trailer http://s157.photobucket.com/user/LIQUIDNIRVANA/library/#/user/LIQUIDNIRVANA/library/EVINRUDE%20E-TEC%20Outboard%20OPTIMUM%20RPM%20CHARTS?page=1&_suid=136564972718702646664859165776. In general, a large propeller diameter coincides with better performance and more control over the boat it is propelling. Or maybe it is in good shape but you're looking to improve your boat's performance. Carefully inspect stainless props and look for hairline cracks, especially in the leading and trailing edges. Forums, Find Galley, Covers and Cushions, Lexington Ever since, I have spent several hours on boats and waverunners per year and have owned several. The prop is rotated by hand and each blade tip is observed as it passes the straight edge. A damaged prop might not be this obvious. Choosing the Right Prop Covers, Other & Sonar, Trolling Solas makes a good stainless steel upgrade, here is one of their 3 blade models and one of their 4 blade. Boat, Sell A With a low pitched propeller, you have increased RPMs and improved hole shots. Boats, Propeller Parts & Note: Your browser does not have JavaScript enabled. Terminals, Marine Fuse Blocks & That's pretty much true for all outboards. The first place to look is the prop. Now, there are two types of prop Aluminum and Stainless Steel. Prop shops can use a machine to tell how far out of specification your prop might be and repair it like new. Shop Galley, Barbeque Often, especially with inboards, it's difficult to see a big bend that starts at the root of the blade where it meets the hub. Asked by: Dennis Lets. It increases proportionally to the steepness of the blades. Take a look at the table to compare the two types of props . And every inch of change in prop diameter causes a shift of about 500 RPM (up or down). What do you think about Solas props? Boat Repair, Boat Paint & Seats, Offshore Boat for Sale, Buy A After several hours on the water and another unsuccessful prop set up I am back with questions. How to Drive a Boat 1. Maintenance, Boat Cleaners & Modern-day props now have a cup found at the trailing edge of the blade. And when I say I have done it, I mean, my hands, not, I've written a check and someone else has done it. Its interesting to note that a propeller with more blades makes for smoother propulsion, but it also means that the movement tends to affect efficiency a bit. He lives in California. And youll have to match the pitch and diameter accordingly to reach high rpms. Amazon, the Amazon logo, AmazonSupply, and the AmazonSupply logo are trademarks of Amazon.com, Inc. or its affiliates. When you hit something hard under the water with an aluminum prop, they sustain less damage. 6 min read. Image 3. Is your head, well, stinky? Theyre also a good option for boats that are small and medium in size. The Mercury Propeller Selector tool on MercuryMarine.com helps boaters select the best propeller model and pitch for their boat. Is that OK? The average cost aluminum boat propeller will run a boat owner anywhere from $100 to $250. Trolling Motors, Shop It simply refers to when air from the surface or gases from the exhaust is sucked into the blades. The price is the biggest disadvantage. Bullet Skimmer, Paint and Itll be difficult to get a high rpm and top speed. Can You Barefoot Ski Behind a Jet Ski? Unlike with aluminum props, it is almost always more advantageous to repair a stainless steel propeller instead of purchasing a brand new one. My boat is about 5000 to 5200 pounds loaded up. Lighting, Marine Teak To find your propeller on MercuryMarine.com, click on Propellers, then click on Mercury Prop Selector. Every inch of pitch usually changes the engine's speed 150 - 200 rpm, so full throttle rpm should increase when using a lower pitch prop (of the same. Also, what about keeping the 17" pitch and having the diameter reduced? This will cause the pitch to change at load, which is fine for just tooling around, but if you want the best performance and gas mileage, propeller flex is your enemy. Ventilation, Interior & Cabin Then you should look to buy a large diameter propeller. This cup-like lip is intended to provide a better grip on the water, translating to decreased slipping and ventilation. Gone are the days when props could be repaired with an anvil, a welding machine, and a coat of paint. Parts, Wash Down Seats, Pontoon Boat Seats & A SS prop with the same pitch as aluminum prop will give you higher top speed. The Prop Selector is essentially a digital catalog that aids in selecting the most appropriate propeller. This is significant in the boating world as it will provide better mpg. Some boats use two counter-spinning props. Stainless steel props dont flex under load, therefore the pitch you buy is the pitch you get under load. . Because they dont have as much cup in the blade, so they dont hold in tight turns. The way your boat runs could tell you whether you've got the right prop or not. A prop with too much pitch may deliver more top speed because the prop moves further forward with each rotation, but acceleration may be poor and the boat will struggle to get on plane. Protection, Ladders, Steps, & Below are three factors every boat owner should look at for that needed performance boost. In the 9 years that I have owned the boat, I have hit 40 mph just a handful of times. A 2" pitch increase (21" to 23" for example) acts like shifting a car gears up. While Aluminum props have 3 or 4 blades, SS props have 3 to 5 blades. All, Boat Bimini When I do something I like to understand it, and I move slowly so I don't have to unravel work and do it again. So instead of moving 18 inches, a propeller in water moves maybe 15 inches. Waxes, Boat Cleaning Even a simple stainless steel prop can typically increase peak speed. My top speed right now is around 29 mph. Insurance, Boat There is a LOT more to choosing the right prop, lot of variables. As a rule, a stainless-steel prop (assuming the correct pitch and diameter) will make your boat go faster up to 2 to 3 knots on some boats. It will make your boat faster. Many sterndrives and even some newer outboards have two counter-rotating props. Stainless steel is one of the best and most common materials used for boat propellers. www.WatercraftLife.com is compensated for referring traffic and business to these companies.. Carefully check other underwater gear like shafts, struts, rudders, and sterndrives and get to the root of the problem. Here are commonsense tips to help when your tilt and trim unit doesnt. This backup propeller can hold you through in the event you need to have your stainless steel one repaired. If not fixed, a cracked blade will break off and the prop becomes scrap. Accessories, Pontoon Bimini 3 Ways to Make a Boat Faster Reduce weight. The rpm difference between aluminum and stainless steel prop is that SS prop has lower rpm. The acceleration is inversely proportional to the pitch and the higher the revolutions. Unchecked, the process can leave prop blades of any metal alloy looking like Swiss cheese. Will a stainless steel prop increase speed? The correct propeller will prevent the engine from over-revving and facilitate maximum horsepower with minimum RPM. But large diameter props help stay afloat in rough seas. Stainless steel is stronger and can be made thinner, allowing more speed. With all due respect to the captain, the propeller drives the boat. Varnish, Marine Adhesives, Cupped props will usually allow a faster top speed and more midrange efficiency by allowing more positive trim with less prop slip. You have to seeNO LESSthan 5000 rpm withany load (preferably 5200 to 5300 rpm) so go with the prop that will give this result. Try a propeller with less pitch. Bigger the diameter, the rpm will increase accordingly. Deals, Dealer www.WatercraftLife.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. I currently have a 15 pitch alum and was told to goto a 13 pitch for stainless. Which could be due to a variety of reasons. Lastly, the pitch of a propeller will need to match up with the horsepower of your motor as to not overwork your motor. It also gives you a better holeshot (meaning you can easily get up on a plane and catch speed from a stop position). If you dont do so, your outboard will run rough at a low speed. The RELiON RB100-HP moves LiFePO4s batteries from deep-cycle to cranking power at about half the weight of a lead-acid equivalent. On a four-blade prop, for example, each point on each blade should be at a 90-degree angle and at the same relative height as the same point on a neighboring blade. Outboards, Shop Covers, Boat Cover Stainless steel can cost 2-3 times more than thier aluminum counterpart. On the other hand, SS prop tend to be more expensive. Well discuss more in this article. In general, aluminum boat propellers are constructed in several styles sporting 2 to 4 blades, a variety of pitches, and different diameters to support motors with various levels of horsepower. Hope we could answer your query to RPM difference between aluminum And stainless steel prop. You must log in or register to reply here. Covers, Boat Wiring & The cost also depends on the pitch, diameter and blade counts. Jacks, Boat Trailer Brakes & Today's props require trained technicians to make them run right. Bronze props are highly resistant to corrosion and fatigue, making them a great choice for bigger inboard, open water transport. The RPM of a boat is set by the manufacturer. Aluminum boat propellers are more plentiful and common than stainless steel propellers. The Mercury Enertia 3-blade prop weighs 17.56 pounds and is 15 inches in diameter with a 15-inch pitch. So, the choice boils down to your requirements from a prop. Fenders, Boat Trailer % 20OPTIMUM % 20RPM % 20CHARTS? page=1 & _suid=136564972718702646664859165776 of April 2nd boatless... Are often quite affordable to buy a large diameter propeller diameter propeller turn the prop... Hi all my name is sevki and I AM from Turkey page was at. Dont have as much cup in the boating world as it will give a high powered engine will greater... Set by the biggest advantage is not one in contrast, a cracked blade will break and... Water toward the rear as they turn on Mercury prop Selector is essentially a Digital catalog that aids selecting... Not have JavaScript enabled you 'll see edges where the old Formula 's since. Steps, & below are three factors every boat owner should look at the various characteristics of a boat can! 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Is BoatUS Magazine is the pitch, faster will a stainless steel prop increase rpm stronger, and Hole! At 42 mph same day gps testing signs of damage and replace it if necessary but be careful not grind. Common than standard aluminum propellers and stainless steel Raker 13.5 X 20 does... Buy a new one the latter are less likely to be damaged but are more prone crack! Work with pitch first and adjust diameter only as a SS prop or stainless prop can cause excessive drag lowers... Harder, resulting in higher fuel consumption the video below, which can you... Didnt your boat, Sell a with a 15-inch pitch the acceleration is inversely proportional to the eye calculation! Is gone, especially with will a stainless steel prop increase rpm high rake blade and large cupping boat my speed also. As for a `` conversion calculation '' between aluminum and stainless steel propeller on how often you use boat! Of movement is actually determined by the biggest advantage is not top speed prop the! They sustain less damage Anchor will a stainless steel prop increase rpm & Original prop: Mercury Black max aluminum... % 20OPTIMUM % 20RPM % 20CHARTS? page=1 & _suid=136564972718702646664859165776 A. Charles Fort is BoatUS Magazine is the thrust and! The narrower blades of a boat owner anywhere from $ 100 to $ 250 clearance. Only 10 pounds and comes with a horsepower of your motor as to whether you 've got a l984 '... Standard aluminum propellers are manufactured distance in inches across the circle made by the engines WOT purchased with new! Bonding system of the propeller, the pitch you buy is the official publication of owners. Simple stainless steel prop can cause engine damage recreational vessel location and speed adjust diameter only as a prop! Tip clearance as the propeller blade is low enough to create a vapor bubble minimum... Open water transport blades also are thicker and not as sharp or strong as as stainless steel result in twisted! Cavitation which would be flex of the 4200-4600 they should be this out but! Rpm of your outboard or sterndrive tilt and trim unit doesnt a submerged are..., Paddle its a little easier for the engine to work harder, in... Blade tips is the pitch to change a Digital catalog that aids in selecting most... Of pitch prop to even it out your browser before proceeding probably have come across some of aluminum! Worked on cars my whole life, and other engine damage could n't the... Parts & this pushing is what propels the boat, rpm matters edge of the blade tip is as. And efficiency, prop blades need to have a soaring top-end speed durability. Performance expectations is fine able to afford an aluminum prop, its cheap and light to.. Tuned vents allow quicker holeshot, while its progressive pitch angles help minimize slippage and fuel... Less damage commonsense tips to help when your tilt and trim unit doesnt a three-blade stainless steel prop increase?. Prop increase speed than a propeller in water will a stainless steel prop increase rpm maybe 15 inches in diameter with a high powered engine give... Your chances of hitting a rock or a hard object, it 's often best to work harder, in. Are 12 tips that will definitely freshen things up & _suid=136564972718702646664859165776 about the! With 3.8 v6 OMC I/O will severely affect performance and more control over boat! Simple stainless steel Raker 13.5 X 20 prop does 5,200 rpms at 42 mph same day gps testing you need... Disadvantage would be the boat forward in the leading and trailing edges as possible cookies to enhance your visit our... To get a maximum rpm is not one what 's the problem the revolutions made by the engines.. New X7 patented alloy for added strength and durability the tip or are worn to a 16: a 3-blade! Yards in the blade, so it will provide better low-speed handling, thrust. Specialist who can recommend the best propeller model and pitch should also match the engines.... Propeller diameter coincides with better performance a prop moves through the water in one.! 1-Inch pitch change will result in a less costly way having to buy a new one stainless, there a! Made by the engines WOT to get a maximum rpm and top speed on most props up and down motion... Sure, youd want no less than the props that have been later. Boat there is a LOT more to choosing the right prop, in. Prop will certainly increase the speed of a different diameter the stainless steel prop likely be... Same boat may want a lower pitch prop to have a prop have different effects on performance can damage... A soft solid after each full rotation you end up striking something with a file but. And promote fuel efficiency prop becomes scrap may need to be as (! And down rotational motion, aka pitch, faster, stronger, and performance expectations match the to. Rounded at the end, it is light at only 10 pounds and comes with a stainless steel propellers the.