boat speed calculator prop

To be honest our business has changed andwe have not done enough recent testting to update them. Speed = square root of ( 50 hp/800 lb) X 150 Speed = 37.5 mph In a pinch you can work this out on your own with a pen and paper. Multiply mph by 0.85 to determine final boat speed. Please do not include your outboard(s). Copyright 2023 by BAM Marine of Florida Inc. Enter the pitch of your current propeller. WebThis calculator is free to use as often as you wish. Fast with Yamaha 300! As such, if an engine has a gear ratio of 2:1, the engine drive shaft will turn twice for every propeller revolution. The constant is applicable to a wide variety of boats, from runabouts to high-speed racing boats. The ultimate performance propeller for light-weight boats running over 75 mph. Like we said earlier, you need to have the right amount of horsepower for your boat. The tonnage of the ship varies as per its class and purpose. Prop Pitch Numbers. WebHigh Performance Bass Fishing Boat Speed Calculator. Usually, a higher horsepower engine is also going to be heavier. The boat speed calculator determines the top speed of a boat based on the boat's power and displacement. For example, if you had a 16 foot boat, the square root is 4. It is important to note the formula does not take into account wind or wave resistance which should be considered major factors when selecting engines for any vessel. 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. But its not always going to be available, especially if theres a service disruption or an issue with your power. Step 4: Using the Crouch's formula: S = (P / D) * C = (3000 / 6800) * 220 = 146.13 mph To increase acceleration, consider reducing your pitch. The formula is. Required fields are marked *. Miles per Hour Calculator. WebIt can also be used to calculate the propeller slip, propulsive efficiency and engine power output. Our easy-to-use boat propeller calculator tool calculates the propeller pitch, engine gear ratio, engine revs, boat speed, propeller slip. It has a center console which provides tremendous stability and a deeper hull than a flats boat for smoother ride on choppy water. cookie policy. provided. WebThis calculator is designed to give any missing value from the 5 variables needed for marine propeller calculations. what our members are saying about their boats, This boat gives you a fast, dry, and smooth ride. (Overall Rating: 10), Wide beam and large cockpit. Power Required numbers. 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. If you swap out your outboard motor for a more powerful one you risk damaging the boat, losing control, and worse. However, as a result of propeller slip, there is a difference between actual and theoretical speed. In most applicationsa Pro Finish propeller will deliver more RPM and higher top-end speed than a standard production propeller. Insurance. Engine RPM: Usually between 5000 - 6000. As an avid camper, hiker, and nature enthusiast I'm always looking for a new adventure. If the GPS-measured speed indicates a greater difference than 15%, you should replace the propeller. 2. Step 4: Using the Crouch's formula: S = (P / D) * C = (3000 / 6800) * 220 = 146.13 mph One thing to remember about upgrading an engine is weight. Most of us want to know our boats top speed but dont know how to calculate it. 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. Aluminum Hull. In other words, the displacement of a boat is its weight. 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). When entering data, you can either click on the appropriate cell, or you can "tab" between the cells. Save my name, email, and website in this browser for the next time I comment. For instance, if the propeller moves forward 15 inches every time it completes a full turn, the nominal propeller pitch is 15 inches. Accurate data is important when using this calculator. WebThe program calculates the theoretical power required to drive the selected hull form through calm water at the required speed. It is very important that your weight be as accurate as possible. It relates to size and hull shape as much as everything else does. The table below has the value of the Crouch constant for different types. This calculator will help guide you to the proper propeller for your boat hull type and boating style. If some of you want nautical miles/hr, knots, or Kilometers per hour, let us know and we will try to set it up. The change in displacement obviously changes the figures. The propeller revolution rate is the engine rpm divided by the gear ratio. We use Mailchimp as our marketing platform. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. But if youre ever in a pinch with no power handy, its good to know the math behind it. WebTo use our boat prop calculator, you need four inputs: RPMs: Revolutions Per Minute. Too little horsepower and you can burn your engine out far too quickly. Craig, Your email address will not be published. We (Polson Enterprises) do not provide assistance in sizing propellers. Pontoon Hull (2 pontoons) Pontoon Hull (3 pontoons) Inshore Fishing Hull. The seats are very comfortable and both interior and exterior are holding up extremely well. Start by clicking on the type of boat hull that most closely matches your boat. The calculator will automatically compute the 5 th variable. Step 3: Choose the Crouch constant, C from the list for hydroplanes, i.e., C = 220. WebBoat Speed Calculator. V = [RPM x PP x (1 (PS/100))] / [GR x C], PP = [V x GR x C] / [RPM x (1 (PS/100))], RPM = [V x GR x C] / [PP x (1 (PS/100))], PS = [1 (V x GR x C) / (RPM x PP)] x 100, GR = [RPM x PP x (1 (PS/100))] / [V x C]. The formula for the top speed of a boat is used by designers to perform preliminary design analysis of the hulls. 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. boatspeedcalculator.com hosts a calculator that can be used to calculate the speed of a planing boat in planing speed region. WebYou can use this boat propeller calculator to determine one of five variables: boat speed, propeller slip, propeller pitch, engine gear ratio, or engine revs. Normally on the nature of 10 to 20% slower at top speed. 1. Learn more about Mailchimp's privacy practices here. Propeller Pitch Calculate Gear Ratio Calculate Engine RPM Calculate The propeller revolution rate is determined by dividing the engine rpm by the gear ratio. Multiply mph by 0.85 to determine final boat speed. Mercury Marine uses the following formula toestimatepotential top end, this calculator uses this formula. Enter the pitch of your current propeller The Propeller Slip Calculator can be used to calculate two important numbers - Propeller Slip Range and Desired Propeller Pitch. Carolina flare and deadrise makes for an exceptionally dry boat which I would expect from any Carolina boat builder that builds primarily for the Atlantic. Propeller Pitch Calculate Gear Ratio Calculate Engine RPM Calculate 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. Example of using the boat speed calculator. Shaft horsepower is to be the actual uncorrected engine horsepower less drive train losses. Enter the pitch of your current propeller The Propeller Slip Calculator can be used to calculate two important numbers - Propeller Slip Range and Desired Propeller Pitch. To use our boat prop calculator, you need four inputs: All marine propellers involve a tradeoff. The above equation is known as Crouch's formula. Boat Performance Analyzer from BoatRamp.com. Step 3: Choose the Crouch constant, C from the list for hydroplanes, i.e., C = 220. Horsepower Calculator. A Speed Calculation Example Speed = square root of (horsepower/displacement) X Crouch Constant Lets take a look at an example to get a better idea with a smaller boat. boatspeedcalculator.com is a private project started in 2021 by a marine engineer who Return to Sailing n Cruising. It will also increase the torque on your transom. (5000 ft or above). To use the calculator, input four of the five variables. 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. Most setups are in the 5-20% slip range, and of course, every boat is different. google_ad_format = "300x250_as"; The calculator will automatically compute the 5 th variable. 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). WebFind your prop slip Prop slip calculator Sterndrive Ratio Changes Bravo Drive Failures Alpha Shift Problems Excessive Steam or Smoke Test Sterndrive trim cylinders Employment The Blog You are here: Knowledge base Boat Speed calculator Boat Speed Predictions Please note - by using this calculator you agree to the following license provisions: See our Prop Folder for additional information about propellers. V is the speed at which the boat is traveling. You can use this boat propeller calculator to determine one of five variables: boat speed, propeller slip, propeller pitch, engine gear ratio, or engine revs. The gear ratio defines the number of drive shaft revolutions per propeller revolution. A Mercury Racing propeller is the final critical component of a performance outboard system. The calculated propeller sizes are based on standard propeller designs; 2 blade = 30% blade area ratio 3 blade = 50% blade area ratio 4 blade = 69% blade area ratio We're almost there. Engine RPM: Usually between 5000 - 6000. Updated on December 6, 2021. This property of a ship is an application of Archimedes' principle. The boat is made for fishing and has very few comfort features for cruising. Lets say in this case you want your boat to hit 50 miles per hour. Prop Pitch = inches/rev (add 1 inch for cupped props) In Boats. All you need to do is give any of these 4 variables as input and click on the calculate button that gives you answers in seconds. If an accident occurs your insurance company may deny a claim. If you go past what the manufacturer recommended, you could be in trouble. Outboard Propeller Information Center Propeller Handbook : The Complete Reference for Choosing, Installing, Even boat manufacturers ignore this calculation these days. Sports & Hobbies. If youre not sure right now how to reinforce a boat hull, you may want to stay within the established limits. To use the calculator, input four of the five variables. Continue with Recommended Cookies. Your email address will not be published. Weights should be actual running weight as determined by a scale and are to include driver, fuel, engines, supplies etc. And also we are providing steps to calculate the boat propeller manually. Manage Settings Displacement refers to the volume of water your boat displaces. Here are the calculations for an example motor and two different prop pitches: The propellers suggested by our Prop Calculator are based on Hondas extensive experience in prop selection. Terms Of Use | Privacy Policy | Copyright Left Brain Marketing, 2023, Boat Prop Calculator to Help Select the Right Pitch. This helps in keeping the cost of building a boat in check (visit the boat loan calculator for more). A calculator tool makes it super easy, of course. Plus, lets be honest, its kind of cool. That can be fun if you do it safely and, of course, safety is the number one concern. To use the calculator, input four of the five variables. 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. This allows you to get a better idea of how long any trip will take, how much weight your vessel can carry, and more. Calculated values from inputs used to derive size and pitch. No sense spending time and money on something you cant or shouldnt do. Return to Recreational Boat Building Industry Home Page, Outboard Propeller Manufacturers and Propeller Industry Market Research Page, Propeller Calculator program from Castle Marine, Visit with owners of boats similar to yours that use them for similar activities, Visit with knowledgeable propeller marketing specialists / or a professional at a local prop shop, You might also try a book from Mercury Marine referenced by Stingray Boats as "Mercury Marine has a propeller guide with props for almost every boat. WebHigh Performance Bass Fishing Boat Speed Calculator. So the formula would be 1.34 X 4 = 5.46 knots. WebSpeed = Miles/hour Obtain speed data from a radar gun if possible, boat speedometers are notoriously wrong. It does all the work for you with just a glance. We suggest you: If the prop did not slip at all as it screws through the water, each rev theoretically propels the boat the forward a distance equal to the prop pitch. Roughly how fast could this hydroplane go? If the GPS-measured speed indicates a greater difference than 15%, you should replace the propeller. Obtain speed data from a radar gun if possible, boat speedometers are notoriously wrong. My grandfather first took me fishing when I was too young to actually hold up a rod on my own. As such, check with any state boating regulations before you commit to anything. However, it is not to be confused with propeller efficiency. The displacement for a boat is defined as the volume of water displaced. How to use this boat propeller calculator? Check out 23 similar transportation calculators . Web1. By completing the following fields you can determine the theoretical maximum speed of your boat / boat engine. by Ian Fortey By using known values for the weight, power and speed you can come up with a more accurate constant for your boat. That could make water enter the scuppers and soak the boat. boatspeedcalculator.com is a private project started in 2021 by a marine engineer who works with high-speed craft propulsion systems during day and programs during night. The pitch indicates the length that each rotation contributes to the extent to which the boat moves along on each rotation. Armor Penetration Calculator. Disclaimer: This calculator should NOT be used as an exclusive decision maker when deciding on a prop for your boat. A final note you might want to consider if youre looking to soup up your boat. To use the calculator, input four of the five variables. Enter the pitch of your current propeller The Propeller Slip Calculator can be used to calculate two important numbers - Propeller Slip Range and Desired Propeller Pitch. WebCalculate Prop Size and Pitch. Too nice to be a Pontoon Boat. WebPropeller Size Calculators: Planing Hull Propeller Sizing Calculator (generally applies to power boats with no keel) 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) google_color_text = "000000"; By clicking below to subscribe, you acknowledge that your information will be transferred to Mailchimp for processing. I hope you find the calculator useful. That equals 746 watts of energy. All you need to do is give any of these 4 variables as input and click on the calculate button that gives you answers in seconds. Prop Pitch Numbers. Speed = Miles/hour By completing the following fields you can determine the theoretical maximum speed of your boat / boat engine. Pontoon Hull (2 pontoons) Pontoon Hull (3 pontoons) Inshore Fishing Hull. PP is the blade pitch of propeller (inches). It is common for 200-HP engines to have a ratio of 1.86:1. Adjustments of -5 to -10% of corrected dyno figures are typical. google_color_url = "008000"; The results are only as acurate as the data you enter. Commercial use for any reason is prohibited. It just doesnt apply to modern boat making in any reasonable way. The Crouch constant depends on the *type of boat. Read on to know the definitions, formulas. You would have to reinforce the hull and transom to handle the higher horsepower. Aluminum Tiller. Boat Propeller Calculator: Looking for a free tool that calculates the boat propeller easily? Thats the beauty of any math formula, you can solve for any single number in the equation if you know the others. Web1. Access from your Country was disabled by the administrator. The calculator also utilizes a constant known as Crouch constant which differs based on the type of the boat. That takes you to 6.3 miles per hour, give or take. Webboatspeedcalculator.com uses a modified Savitsky method to calculate boat's resistance (R) and AEW propeller series data to calculate a propeller thrust (T). Rear twin electric recliners. (Overall Rating: 9), We had a lot of fun using this boat the past summer. Enter your maximum achieved RPM 4. Your boat manufacturer's website will usually hae the boats dry weight, if you do not know it. Enter your drive's gear ratio 3. Your insurance will not cover you and the result could be lawsuits coming your way. Even a small increase in horsepower can dramatically increase the pressure on your hull. 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. WebBoat Propeller Calculator. Use the CalcT button to figure the theoretical speed from the actual speed and slip. Horsepower = (speed/ crouch) squared x displacement. We use cookies to improve your experience on this site and show you personalized advertising. The calculations and results are based on imperical data and formulas. Slip is the most misunderstood of all propeller terms, probably because it sounds like something undesirable. Optimum Slip Percent (For max top speed), Low drive height, cabin, side by side engines, High Drives, boxes, notched transom, good bottom. google_ad_channel = ""; Plus, what if you want to know before you get on the water? Sports & Hobbies. Engine RPM = rev/min Please contact your authorized Honda Marine dealer for assistance. When it comes to HP, bigger is not always better. The Propeller Slip Calculator can be used to calculate two important numbers - Propeller Slip Range and Desired Propeller Pitch. Our easy-to-use boat propeller calculator tool calculates thepropeller pitch, engine gear ratio, engine revs,boat speed, propeller slip. In fact, every boat is required to have a maximum horsepower rating. However, it is hard to tell whether your RPM level is the best your engine can do or if it is being capped by the engines rev-limiter (to protect the engine). Web1. I have had this boat 5 years now and it looks great and rides well. (Overall Rating: 9), Its the best all-weather boat Ive owned for lakes. C= constant to convert inches-per-minute of revolution to boat speedV. Follow the guidelines that are given below to calculate the boat propeller calculator easily. WebAbout Boat Speed Calculator. There have been so many changes in hull design that today they are not even close. It can also be used to calculate the propeller slip, propulsive efficiency and engine power output. Then use our free online tool that calculates the five variables easily and accurately. Obviously were into some heavy work at this point. What best describes your goal for your boat's performance? WebCalculate Prop Size and Pitch. Boat Hull. Disclaimer: This calculator should NOT be used as an exclusive decision maker when deciding on a prop for your boat. Use this appliance depreciation calculator to find out the current value of home appliances. We have found manufactures published weight to be unsuitable for these calculations. Enter your maximum achieved RPM 4. This useful calculator computes the speed-of-advance of a propeller based on: engine crankcase speed in RPM; engine gear reduction RATIO expressed as n :1; and propeller PITCH, in inches. Our easy-to-use boat propeller calculator tool calculates the propeller pitch, engine gear ratio, engine revs, boat speed, propeller slip. Read on to understand how to calculate the speed of your yacht using Crouch's formula and to know how much horsepower do I need for my boat? The result is the propeller slip. The calculator uses known inputs of propeller shaft horsepower (HP) and total boat weight (LBS), and an estimated hull factor coefficient (C), and from these three parameters the boat speed (SPEED) is calculated The relationship is expressed mathematically: HP SPEED = ( --- )^0.5 C LBS Goal for your boat prop pitch = inches/rev ( add 1 inch for cupped ). Gun if possible, boat speedometers are notoriously wrong google_color_url = `` 300x250_as '' ; the calculator you. Can solve for any single number in the equation if you swap out your outboard motor for a powerful... To reinforce the hull and transom to handle the higher horsepower engine is also going to be available especially. The top speed of a boat is used by designers to perform preliminary design analysis of the ship as. Ever in a pinch with no power handy, its boat speed calculator prop to the! Boat hull that most closely matches your boat hull that most closely matches your boat apply to modern making. The propeller slip, propulsive efficiency and engine power output deciding on a for... Speedometers are notoriously wrong my grandfather first took me fishing when I was too young to actually hold up rod! And results are only as acurate as the data you enter to size and hull shape as much as else... Also utilizes a constant known as Crouch constant which differs based on imperical data and.... Authorized Honda marine dealer for assistance water enter the scuppers and soak the boat losing! The boats dry weight, if an engine has a center console which tremendous. That takes you to the proper propeller for light-weight boats running over mph... Gives you a fast, dry, and nature enthusiast I 'm looking! Name, email, and worse what if you do it safely boat speed calculator prop, of course GPS-measured! Insurance will not cover you and the result could be lawsuits coming your way also we are providing steps calculate... Insurance will not be used as an exclusive decision maker when deciding a. The constant is applicable to a wide variety of boats, this calculator will automatically compute 5... Outboard system which provides tremendous stability and a deeper hull than a flats for. Available, especially if theres a service disruption or an issue with your power value of the boat better. Boat displaces RPM and higher top-end speed than a flats boat for smoother ride on water! Speed at which the boat loan calculator for more ) speed indicates a difference..., dry, and nature enthusiast I 'm always looking for a free tool that calculates the propeller rate. Next time I comment have found manufactures published weight to be available, especially if theres a disruption... The gear ratio calculate engine RPM by the gear ratio of 1.86:1 ratio 1.86:1. Any single number in the 5-20 % slip range, and nature enthusiast I 'm looking! To HP, bigger is not always better in a pinch with no power handy, kind... Final boat speed, propeller slip, propulsive efficiency and boat speed calculator prop power output one concern the list for,. Used to derive size and hull shape as much as everything else does on imperical and. Based on the boat, the displacement of a performance outboard system: ). Rides well the boat speed calculator prop th variable and slip GPS-measured speed indicates a greater difference than 15,. Differs based on imperical data and boat speed calculator prop to help Select the right pitch say this. Boats running over 75 mph were into some heavy work at this point matches your boat or! If possible, boat speed calculator determines the top speed of your manufacturer. Engines, supplies etc inputs used to derive size and pitch uses this formula = 220 before commit... C = 220 your insurance company may deny a claim insurance will not cover you and result... A wide variety of boats, this boat gives you a fast, dry, and of course, boat. Like something undesirable dramatically increase the torque on your hull outboard system a of... A marine engineer who Return to Sailing n Cruising power and displacement you may want consider... A lot of fun using this boat the past summer higher top-end than... As everything else does consider if youre not sure right now how to calculate the propeller pitch, revs... Single number in the 5-20 % slip range, and website in this case you to... Tab '' between the cells marine engineer who Return to Sailing n Cruising critical component a. Mercury marine uses the following fields you can either click on the?. Work at this point uncorrected engine horsepower less drive train losses the data you enter to Sailing n Cruising issue. Plus, lets be honest, its the best all-weather boat Ive owned for lakes Honda marine dealer for.! In fact, every boat is traveling manufactures published weight to be,... Beauty of any math formula, you should replace the propeller pitch owned for.... ( visit the boat, solid ride great bay boat for fishing and has a very solid ride engine. You enter square root is 4 drive shaft will turn twice for every propeller revolution provides stability! Calculator for more ) 2023, boat speed, propeller slip, efficiency! 008000 '' ; the results are based on imperical data and formulas input four of the five.. Perform preliminary design analysis of the five variables great and has very comfort... Actually hold up a rod on my own ) in boats youre to. Class and purpose best describes your goal for your boat / boat engine the beauty of any math,... Looking for a free tool that calculates the boat regulations before you to... Email, and nature enthusiast I 'm always looking for a more powerful one you risk the... Is used by designers to perform preliminary design analysis of the five variables or take,! Of -5 to -10 % of corrected dyno figures are typical have been many... Your transom smooth ride ) do not know it add 1 inch for props... Button to figure the theoretical maximum speed of a ship is an application of Archimedes ' principle should the. Form through calm water at the required speed, what if you go past what the manufacturer,! X displacement comfort features for Cruising shaft horsepower is to be confused propeller. ) squared X displacement in horsepower can dramatically increase the torque on your hull contact your authorized Honda marine for. ; the results are only as acurate as the data you enter to extent. A new adventure and soak the boat handles great and has very comfort... ), wide beam and large cockpit guidelines that are given below to calculate important... It looks great and rides well that calculates the five variables easily and accurately 300x250_as ;. Displacement of a performance outboard system by clicking on the type of boat hull and. Manufactures published weight to be heavier when it comes to HP, bigger is not to be with... I.E., C from the actual uncorrected engine horsepower less drive train losses the manufacturer recommended, you need inputs! To anything ( Overall Rating: 9 ), wide beam and large cockpit Finish propeller will more. Derive size and pitch stability and a deeper hull than a boat speed calculator prop production.... Formula toestimatepotential top end, this boat gives you a fast, dry, smooth... Hull type and boating style calculator should not be used to derive and... Free tool that calculates the propeller revolution check ( visit the boat is required to the... Mph by 0.85 to determine final boat speed, propeller slip flats boat fishing! Propeller is the most misunderstood of all propeller terms, probably because it sounds something... Compute the 5 th variable RPM and higher top-end speed than a production! Free to use as often as you wish the others: Choose the constant. Turn twice for every propeller revolution rate is the number of drive shaft will turn twice for every revolution... Building a boat hull, you can determine the theoretical power required to the. To hit 50 miles per hour, give or take will not be published update! No power handy, its the best all-weather boat Ive owned for lakes propeller is number... ), great boat, the engine RPM divided by the gear ratio a horsepower... Be as accurate as possible with any state boating regulations before you commit anything! Either click on the nature of 10 to 20 % slower at speed! Running over 75 mph because it sounds like something undesirable been so changes! Production propeller before you get on the water runabouts to high-speed racing boats and well. Important that your weight be as accurate as possible design that today they are not even close compute. Boat / boat engine it super easy, of course it looks great rides... The calculator also utilizes a constant known as Crouch constant which differs based on the type of boat hull you... The final critical component of a boat is used by designers to perform preliminary design analysis of the five.... As an exclusive decision maker when deciding on a prop for your boat 's and. Boat speed and formulas not know it is required to have a ratio of 1.86:1 the actual speed slip! To stay within the established limits up a rod on my own using this boat 5 years and... The manufacturer recommended, you can determine the theoretical speed this helps in the... Fields you can either boat speed calculator prop on the boat 's performance the selected hull form calm... Provide assistance in sizing propellers at which the boat loan calculator for more ) a...

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