the one's Ive used early on don't seem to jive with downeast hulls.The hull shape options were deep vee or full displacement. However, unlike land vehicles this speed is not a ratio of distance and time. Products, Carbon Monoxide & Accommodations need to be made. Youll also need to include Crouchs constant which varies based on the kind of boat were talking about. The best way to calculate what prop is needed is to compare your boat with other boats that are very similar, but comparing 2 boats that are very similar is even hard to do, as no 2 custom boats are the same. Prop slip may be entered as either decimal or integer values (.15 or 15).Prop slip may be entered as either decimal or integer values (.15 or 15). A racing hydroplane might displace 6700 lbs, for instance. I tried it with my prop. Even water conditions and hull cleanliness can change your top speed. When it comes to HP, bigger is not always better. Step 3. To use the calculator, input four of the five variables. https://www.mercuryracing.com/references/signup-form-ty.html, /content/brunswick/mercury-racing/na/us/en/search-results.html. It can cost a lot of money for that last bit of efficiency and this is why there are so many boats that just perform adequately. Biminis, View To increase acceleration, consider reducing your pitch. You got some good data there.. The volume is then converted to weight. This was lost to a factor called Slip. Axles, Boat Trailer Tie Horsepower = (speed/ crouch) squared x displacement HP = (50/150) squared x 800 HP = 88.89 In this case, with your small boat displacing 800 lbs, if you want to reach 50 miles per hour, then you need a 90 hp engine. Jacks, Boat Trailer Brakes & Plus, what if you want to know before you get on the water? Its an expensive trial and error process on these inboards .. Well said Brian. A couple ways to estimate this: 1) use the Mercury Prop Slip Calculator, or 2) if you know the top speed of your boat, enter the RPMs, Pitch and Gear Ratio in the Boat Speed Calculator tool and vary the slip value until the estimated speed is correct. Calculate Slip % Get the Latest News from . Deals, Trailering And when you play around with boat styles, it makes a big difference in what props the calculator spits out. Step 2. If some of you want nautical miles/hr, knots, or Kilometers per hour, let us know and we will try to set it up. Mercury Marine uses the following formula toestimatepotential top end, this calculator uses this formula. google_ad_height = 250; If it is the former, then it might not make much difference after you account for the fact that each 1 increase in pitch will result in approximately a 200 decrease in RPMs. Engine RPM = rev/min The Quicksilver Black Diamond is the best all around boat prop you're going to find. SLIP, a percentage, 0.1 to 99.9; index of propeller performance. Speed = square root of ( 50 hp/800 lb) X 150. Crouch's formula is the equation to find the top speed of a boat based on its power P and tonnage D. The speed of the boat, S is given by the equation. Step 2: Insert the boat's displacement, D = 6800 lbs. Waxes, Boat Cleaning Hydro is at top speed turning 7600 rpm with 37% gears and a 11 1/4 x 17 prop. Wells, Toilet & Waste Another formula for calculating hull speed for a displacement hull you might see is fairly simple. google_color_link = "0000FF"; This helps in keeping the cost of building a boat in check (visit the boat loan calculator for more). Find your ideal Mercury Prop in 5 steps or less. This is the theoretical top speed of the vessel. Enter Pitch. Say you want a top speed of 150 miles per hour for your 6,000 lb hydroplane. 'Gear ratio' defines the number of drive shaft revolutions per propeller revolution. Shop for a list of Propeller Manufacturers and information on the boat propeller market. Boat, Boat Buyers google_ad_width = 300; Login, Boats Number of propellers [-] * Skeg thickness [m] * Skeg chord [m] * Skeg span [m] * Gear ratio [n:1] * Engine shaft speed [1/min] * Propeller blade number [3-4] * A racing catamaran can be up to 230. For example, say you have a displacement hull with a waterline length of 25 feet, then the hull speed is 5 x 1.3 = 7 knots. It is common for 200-HP engines to have a ratio of 1.86:1. Rails, Marine Tools & Tool In most applicationsa Pro Finish propeller will deliver more RPM and higher top-end speed than a standard production propeller. Combos, Fishing Tools & it can accommodate nine persons, has comfortable seating for all passengers, is easy to board for both passengers and water skiers, handles well in rough water, is easy to launch and dock, looks great on the water and drew lots of compliments from all who saw it on the water. (Overall Rating: 10), Great boat and a great price point. Hardware, Boat This weight is usually measured in tonnes or pounds. google_ad_client = "pub-1494719669027267"; A final note you might want to consider if youre looking to soup up your boat. 1. Most setups are in the 5-20% slip range, and of course, every boat is different. Therefore, the first consideration is whether to optimize top speed, acceleration or some combination of the two. Updated on December 6, 2021. Hopefully I can get it dialed. Biminis, RV & Trailer Deals, Dealer Marble, Engine GPS Chartplotter and Fish Finder Combo, Find Terms Of Use | Privacy Policy | Copyright Left Brain Marketing, 2022, Boat Prop Calculator to Help Select the Right Pitch. I also liked the shaft size calculator. What is boat speed Calculating using Crouch's formula? Transom Insurance, Boat When adding power or changing the gear ratio in a given setup, you can calculate how it will affect the pitch of the propeller needed to stay within the desired RPM range. Another thing to consider is whether or not you have a self-draining cockpit. Winches, Boat Motor Supports & The calculated boat speed is units of statute-miles-per-hour. Thats the beauty of any math formula, you can solve for any single number in the equation if you know the others. Maintenance, Pumps and Or, more likely, the calculator on your phone. Step 4: The calculator will use Crouch's formula to return the horsepower value as. 24 Pontoon boat with a 115hp and a medium load got around 25mph (38 kilometers) 18 Party Barge with a 75hp engine can get around 24mph (38 kilometers) 20 Bass Buggy with a 60hp motor only gets around 13-17 mph (18 to 27 kilometers) 20 Starcraft with a 75hp engine and with no load can get 23 mph (36 kilometers) 26 Crest III with a . Telescopes, Covers and The propeller revolution rate is determined by dividing the engine rpm by the gear ratio. This one does not require as many numbers but also doesnt give you the most accurate answer. " Use English Units (pounds, cubic feet), no commas, please! It does not take the hull length into account. Youll need to know your boats shaft horsepower as well as its displacement. For example, I have a boat with a max RPM of 5,800, my propeller pitch is 24 and the gear. You can calculate the distance per day by simply multiplying the speedin knots by 24 hours: Most sailboats cover anywhere between 100-180 NM per day. Rear twin electric recliners. (Overall Rating: 9), We had a lot of fun using this boat the past summer. The formula is. I hope you find the calculator useful. If you prop your boat to maximize top speed, acceleration will be compromised and visa-versa. Parts, Rule 1500 GPH Automatic It can also be used to calculate the propeller slip, propulsive efficiency and engine power output. It is not my favorite hull because it draws a little more water than some of the other shallow water bay boats such as Pathfinder. (Overall Rating: 9), Great boat, solid ride great bay boat for fishing. This ratio is found by dividing the actual boat speed by the theoretical boat speed to get a ratio. Too much can damage the boat and lead to accidents. This property of a ship is an application of Archimedes' principle. The best thing to do is calculate a constant from published tests oryour personal setup and go from there. Slip is not a measure of propeller efficiency. Not that I've looked extensively for one but. If the percentage is negative, you have input incorrect data, usually, this means the gear ratio is incorrect or the tachometer is not dialed in. If you are looking to purchase a boat, be sure to check out the boating reviews left by other boat owners. For example, if you had a 16 foot boat, the square root is 4. Outboards, Shop Enter Actual Speed. A number of factors affect how much horsepower is ideal for your boat. Trolling Motors, Shop This calculator is fornon-commercial useby the general public only. JavaScript is disabled. propeller line, investing in a new base casting that will be used to produce this high-performanceprop in a 15-inch diameter and pitchesof 26.0, 26.5, 27.0 and 27.5 inches. Speed - Actual Speed ) / ( Theo. Hardware, Boat Seat Accurate data is important when using this calculator. The calculator will automatically compute the 5th variable. Covers, Boat Shrink Wrap We have found manufactures published weight to be unsuitable for these calculations. Enter any 4 variables and the 5th variable will be calculated. Systems, Marine Plumbing Dollies, SportsStuff Great Big It has a center console which provides tremendous stability and a deeper hull than a flats boat for smoother ride on choppy water. Boat Gel Coat - Spectrum Color, Pumps and Specifically, the actual speed is typically 10-20% slower than the propeller than the theoretical speed when the boat is traveling at its top speed. Due to prop slip the boat is actually going slower than the theoretical speed. Bullet Skimmer, Paint and The seats are very comfortable and both interior and exterior are holding up extremely well. A boat propeller has two basic dimensions: diameter and pitch. Western House Decoy Industrial Estate Silverhills Rd Newton Abbot, TQ12 5ND United Kingdom (616) 452-6941 (616) 452-6941 ; info@miwheel.com ; mmp-i.com It does all the work for you with just a glance. In this case, with your small boat displacing 800 lbs, if you want to reach 50 miles per hour, then you need a 90 hp engine. So the formula would be 1.34 X 4 = 5.46 knots. liability, financial or otherwise, for the calculations or results provided. Step 3: Choose the Crouch constant, C from the list for hydroplanes, i.e., C = 220. One thing to remember about upgrading an engine is weight. A new engine could throw off the balance of your boat. FORMULA TO CALCULATE PROPELLER SLIP The true speed of the boat was 45 MPH. There are no products to list in this category. but i don't fully understand how to use it correctly for calculations, Jon and V boat Conversions and Modifications, 1967 Starcraft Seafarer - 1986 Evinrude 40hp, Advice and ideas on decking out our Tracker Guide v14, 1986 Evinrude 40 Tiller, How to wire fuel primer solenoid. Step 4. Cushions, Lexington Thus, for example, if you have a 35-foot boat with a waterline length of 28 feet, its hull speed works out . Horsepower works out to 550 foot-pounds per second. Storage Enter Gear Ratio. Even if you could put in accurate details, the prop calculator cannot deal with all of the unknown factors. for use in every day domestic and commercial use! Displacement and Semi-Displacement Hull Propeller Sizing Calculator (generally applies to boats with keels) Minimum Propeller Diameter Calculator (good for checking the propeller diameter against the hull size) Conversion Calculators: Liquid Volume to Weight Converter (helpful for calculating fuel and water weights in your tanks) Speed Converter Learn more about Mailchimp's privacy practices here. Save my name, email, and website in this browser for the next time I comment. Fast with Yamaha 300! The Right Fit, Shop By These blueprinted propellers feature perfectly matched blade profiles for consistent multi-engine RPM. This is especially relevant if you ARE hitting the max RPM level established by the engine manufacturer with your current prop. Typically, the slip reduces as the speed increases, generally diminishing to under 10%. Boat Repair, Boat Paint & The ultimate performance propeller for light-weight boats running over 75 mph. lvue Basic Prop Calculator. You may find it when you Google boat speeds and wonder why the different formulas exist. By using known values for the weight, power and speed you can come up with a more accurate constant for your boat. Lets say you can get a higher horsepower engine and really boost your overall speed. Please select all the ways you would like to hear from Mercury Racing: You can unsubscribe at any time by clicking the link in the footer of our emails. I'll try and figure it out. All rights reserved. In other words, the displacement of a boat is its weight. & Rings, Prop Nut Kits & In addition, if you are looking to sell your boat, you can negotiate a better price by . The speed of a boat having an engine to deliver P horsepower and displacing D pounds is written as: where S is the boat speed and C is the Crouch constant. The prop calculators I've seen give you an option to choose a boat style. Use this calculator to figure out just about anything in regard to propeller, ratio, RPM and speed. A drag of 136.3 N at 7 kts yields an EHP of 491 watts. That means when youre using your motor for propulsion, our original equation is far more useful. See the article " Do You Really Need That Much Power? For instance, a modern US navy Gerald R Ford-class aircraft carrier displaces about 100,000 tons at its full load whereas a 17th-century fishing boat displaced only about 13 tons. What Happens When a PWCs Steering Control is Turned to the Right? That said, its not always the case. Weights should be actual running weight as determined by a scale and are to include driver, fuel, engines, supplies etc. Accessories, Marine Electrical In Boats. You must log in or register to reply here. Dock, Cabin and About Boat Speed Calculator. Biminis, Paint and If the blade had no angle of attack, there would be no slip; but, of course, there would be no positive and negative pressure created on the blades and, therefore, there would be no thrust. Holders, Cabin Accessories & Many modern engines do a very good job of keeping weight down. Even a small increase in horsepower can dramatically increase the pressure on your hull. The Propeller Slip Calculator can be used to calculate two important numbers - Propeller Slip Range and Desired Propeller Pitch. Boat speed units. So, if you want to know horsepower to achieve your desired top speed, do a reverse calculation. And why a calculator tool is so much more helpful. Remember, when your boat was designed, it was designed with these calculations in mind. Anchor Box Anchors, Fishing Rod & Reel Guide, Boat Sometimes you can't hear the prop slip, however . Deals, Electronics Does this mean you can never exceed the horsepower rating of your hull? It can also be used to calculate the propeller slip, propulsive efficiency and engine power output. He has quite the analytical mind when it comes to this sort of stuff. If you have any input on what you want to see on the calculator let me know as well thanks. I kneeled on the floor, and it had a dead mans throttle. Lets say in this case you want your boat to hit 50 miles per hour. Lighting, Marine Teak This calculator should NOT be used as an exclusive decision maker when deciding on a prop for your boat. BoatSpeed= (S/L) * (LWL) 0.5 = 0.73 * 4.06 = 2.96 knots. Alternatively, you can also run this calculator backwards to know how much horsepower I need for my boat to achieve a certain speed. Here are the units it supports: Knots (nautical miles per hour) - 1 knot = 1.852 kilometers per hour, 0.514 meters per second or 0.5144 miles per hour (1 mile is equivalent to 1760 yards). In a pinch you can work this out on your own with a pen and paper. Re: Can you calculate boat speed from prop pitch and rpm? If you want to calculate boat speeds in nautical-miles-per-hour or KNOTS, a separate calculator is available. Even if you never need to write it out by hand. Plus, lets be honest, its kind of cool. You have to have a basic understanding of the limits of your parts. Tops, Bimini Top 1) 7600 x 1.37 = 10,412 rpm at the prop 2) Convert 10,412 revolutions per minute (RPM) to revolutions per hour by multiplying x 60 (60 minutes in one hour) 10412 x 60 = 624720 revolution per hour Seats, Offshore Boat High Back Reclining Helm Seat, Cabin and If the percentage shown is greater than 20, there is typically room for improvement by switching to a different propeller, adjusting drive height, etc. For instance, average runabouts have a Crouch constant of 150. The best calculators will get you in the ballpark on a prop recommendation, only if you put in the correct details, which is virtually impossible to do before sea trials. Step 5. Displacement refers to the volume of water your boat displaces. They recognize our calculator as the inspiration for theirs near the bottom of the page. Vinyl, Floating Boat Commercial use for any reason is prohibited. For example, 300gram 2000kv Motor will spin a 45mm prop just fine in most 25-30" racing hulls on 14 volts. The Propeller Slip Calculator can be used to calculate two important numbers - Propeller Slip Range and Desired Propeller Pitch. Step 3: Enter the Horsepower of your engine. Shelters, Boat I've reached out to a number of companies and come up short. However, we thinking knowing the basics behind how and why the calculator works is important, too. Multiply mph by 0.85 to determine final boat speed. Acessories, Fishing Outriggers & The MAX5 propeller is designed for single- and multiple-engine applications, including the 400R outboard and the 600 SCi sterndrive. If you swap out your outboard motor for a more powerful one you risk damaging the boat, losing control, and worse. Forums, Find If you put in 4000 lbs for our boat (mine is just over 3000, but with gear and people I assume 4000) and 320 hp, with the least efficient hull design, then we should be doing like 64 mph. This useful calculator computes an estimate of boat speed for a modern planing monohull using inputs of the power at the propeller shaft, the total boat weight, and a coefficient called the hull factor. C is the constant to convert inches-per-minute of revolution to boat speed V; A collection of really good online calculators. The calculator also utilizes a constant known as Crouch constant which differs based on the type of the boat. Acessories, Fish Cleaning It doesn't mean that it will work! Ski, Wakeboard That can be fun if you do it safely and, of course, safety is the number one concern. Varnish, Marine Adhesives, Boats, Propeller Parts & If you already own a boat, be sure to share your experiences by submitting a review so others will benefit from it. Before you start, we would like to point out that these calculators are based on empirical data.They are not intended to perform complex cavitation or efficiency calculations.The results provide "best size" propeller dimensions based on your input data.There will always be a number of propeller size combinations that will work on your vessel, finding the best one is the trick.These calculators will help guide you to determine various combinations of power, gear ratio and propeller size for your vessel.Due It puts you in the ball park and that is about it. Powerful. Great article. There are so many factors that affect boat speed that it is hard to make accurate estimates of what the real top end will be. google_color_bg = "F0F0F0"; Downs, Couplers, Mounts, A racing boat has the value of Crouch constant around 210. Ropes, Boat google_color_border = "000000"; Plus, when you add power sufficient enough to overcome hull drag, this number no longer applies. Going to raise the motor up a bit and play with trim this weekend. For a better experience, please enable JavaScript in your browser before proceeding. GPS is a good way to figure out your boat speed with no effort. If the Yanmar is a version of 4LH engine, it is rated for 3,300 rpm and 3,450 WOT. Plumbing, Anchor Determine the correct diameter and pitch of a propeller for any given vessel and engine. Tiger Woods Yacht: Everything You Want To Know. All the credit should go to James Hebert at continuouswave.com; I simply copied and pasted his work and included the link. Savers, Boat Trailer Guides & Basic Prop Calculator.Determine the correct diameter and pitch of a propeller for any given vessel and engine. Craig, Your email address will not be published. The tonnage of the ship varies as per its class and purpose. Too much horsepower can be dangerous. 1.34 x the square root of the waterline length in feet, or Covers, Other A propeller pitch can be understood by considering the action of a screw. google_color_url = "008000"; Accessories, Boat Use the CalcT button to figure the theoretical speed from the actual speed and slip. Input vessel, engine and transmission details and the program will calculate: Maximum achievable speed, estimated fuel consumption, recommended propeller diameter and pitch, a propeller pitch based on a required fixed diameter, plus . If it goes too far beyond manufacturer recommendations you could collapse the hull entirely. For instance, your waterline length can actually change as your speed increases. However, it is not to be confused with propeller efficiency. As such, check with any state boating regulations before you commit to anything. Check out 23 similar transportation calculators , Social Media Time Alternatives Calculator. To be honest our business has changed andwe have not done enough recent testting to update them. Copyright 2019 IBOATS. Parts, Sacrificial Anodes & You can change one parameter and recalculate the rest. Youll need to know a handful of factors when calculating boat speed. The boat handles great and has a very solid ride. (Overall Rating: 10), Not many people are very familiar with Bryant but they build a quality boat that is a bit more affordable than some of the other premium names. However, as a result of propeller slip, there is a difference between actual and theoretical speed. We (Polson Enterprises) do not provide assistance in sizing propellers. If you change the propeller on the boat, you change a component in the . John Loo 2017-08-13T21:34:25-07:00 Share on: Page load link Distribution, ProMariner ProNautic To use our boat prop calculator, you need four inputs: All marine propellers involve a tradeoff. Taking into accout the pitch, gear ratio, and using about 15% slip, I came up with 43 mph at 4500 rpm, which is about what my speedo says. Sport Series. SPEED, a positive number; the boat speed in various units of measurement. That said, many factors can get in your way. Adjustments of -5 to -10% of corrected dyno figures are typical. Cruisers, average runabouts, passenger vessels, Light high-speed cruisers, High-speed runabouts. It's not too expensive, but it's built to last and to perform. The formula for the top speed of a boat is used by designers to perform preliminary design analysis of the hulls. Shaft horsepower is to be the actual uncorrected engine horsepower less drive train losses. Slip is the most misunderstood of all propeller terms, probably because it sounds like something undesirable. Input vessel, engine and transmission details and the program will calculate: Maximum achievable speed, estimated fuel consumption, recommended propeller diameter and pitch, a propeller pitch based on a required fixed diameter, plus. Boat Performance Analyzer from BoatRamp.com. Prop Pitch = inches/rev (add 1 inch for cupped props) Data Input A value for RPM is typically input as a known parameter. Bilge Pump, Tires, Rims, & Hub From Propeller Calculator, Crouch's Calculator - CONTINUOUSWAVE: Propeller Calculators use the relationship between RPM, RATIO, PITCH, (BOAT) SPEED, and SLIP as described below to calculate one parameter from the other four. This makes particular sense if you are NOT hitting the max RPM level established by the engine manufacturer when running at Wide Open Throttle (WOT) with your current prop. Maximum "hull speed", in knots, is equal to about 1.3 X the square root of the waterline length of the hull in feet. Hopefully put a tach on soon as well. For example, a propeller described as 14.5 x 19 has a diameter of 14.5 inches and a pitch of 19 inches. As a very general rule the maximum speed of any displacement hull--commonly called its hull speed--is governed by a simple formula: hull speed in knots equals 1.34 times the square root of the waterline length in feet (HS = 1.34 x LWL). ! (Overall Rating: 10), Excellent high-end Pontoon Boat with a 400hp R Mercury outboard Racing motor. Step up in performance with a prop thats hand finished and fine tuned from a raw stainless steel casting with perfectly matching cup heights and a custom blade thickness profile. If you have a contact or are capable of producing the formulas please let me know. If youre not sure right now how to reinforce a boat hull, you may want to stay within the established limits. Optimum Slip Percent (For max top speed), Low drive height, cabin, side by side engines, High Drives, boxes, notched transom, good bottom. Deals, Pumps & Plumbing PS is the index of propeller performance (as a percentage). Oars, Wakeboard, Wakesurf & That is too bad. Speed = Miles/hour Obtain speed data from a radar gun if possible, boat speedometers are notoriously wrong. Calculator; Documentation; FAQ . If you hear a slight change in pitch in the sound coming from behind the boat, the prop could be starting to slip, and your speed may drop by 1 or 2 MPH. That could make water enter the scuppers and soak the boat. PITCH, a positive number; blade pitch of propeller in inches. Of course, most boaters will want something that is in between good hole shot with acceptable top end speed. He also stated that "The driving power is 1kW and the rotational speed is 360 rpm." and asked for "the formula for calculating the boat speed".In order to determine the formula for speed as a function of power, either EHP/pn or SHP/pd . Maintenance, Boat Cleaners & How much horsepower you have, propeller slip, the condition of your boat and more alter this. RATIO, a positive number; lower unit gear reduction ratio; the number of revolutions of the crankshaft to produce one revolution of the prop shaft. Manufacturer, Boat Tables & And, just as likely, we dont think we need to. United States Salary Tax Calculator 2022/23, United States (US) Tax Brackets Calculator, Statistics Calculator and Graph Generator, Grouped Frequency Distribution Calculator, UK Employer National Insurance Calculator, DSCR (Debt Service Coverage Ratio) Calculator, Arithmetic & Geometric Sequences Calculator, Volume of a Rectanglular Prism Calculator, Geometric Average Return (GAR) Calculator, Scientific Notation Calculator & Converter, Probability and Odds Conversion Calculator, Estimated Time of Arrival (ETA) Calculator. For a better experience, please enable JavaScript in your browser before proceeding. Surfbaud Freeware Propeller Calculator is an Excel spreadsheet program. For instance, if the propeller moves forward 15 inches every time it completes a full turn, the nominal propeller pitch is 15 inches. It's right hand and comes in a large range of pitch sizes. If you wonder how fast a boat can go, this calculator will help you answer that. Its pretty simple to use the formulas. Trying to propel the boat faster than this will result in enormous increasing power requirements. Deals, Paint & Maintenance ACCOUNT, Find The best thing to do is calculate a constant from published tests or your personal setup and go from there. Deals, Boat Seats for Sale, Buy A See our Prop Folder for additional information about propellers. Meters, Marine Electrical Panels Mercury Racinghas expanded the pitch range of its popularRevolution4 XPpropeller line, investing in a new base casting that will be used to produce this high-performanceprop in a 15-inch diameter and pitchesof 26.0, 26.5, 27.0 and 27.5 inches. I appreciate that . To use the calculator, input four of the five variables. Your insurance will not cover you and the result could be lawsuits coming your way. Required fields are marked *. Lets take a look at an example to get a better idea with a smaller boat. Plug in your info, and click "Calculate" on the item you want to compute. Systems, Lowrance Hook2-4 GPS & Circuit Insurance. (a 15 inch pitch prop theoretically propels the boat 15 inches in one revolution). Here are a boat speed and prop slip calculator if anyone is interested: Thanks man. Prop Calculator Clear Defaults. Why does this formula exist and the other formula as well? However, as you do this, you should increase your RPMs by approximately 200 for each 1 reduction in pitch (until the maximum RPM rating is reached). Even boat manufacturers ignore this calculation these days. Cast from proprietary stainless-steel alloys, hand-finished and zero-balanced by artisan technicians in our prop shop, Mercury Racing propellers offer the ultimate in performance and durability. boatspeedcalculator.com hosts a calculator that can be used to calculate the speed of a planing boat in planing speed region.
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