Boat Speed Select a Hull Type 'Gear ratio' defines the number of drive shaft revolutions per propeller revolution. 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. It assumes proper hull size, weight and 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. This ratio is found by dividing the actual boat speed by the theoretical boat speed to get a ratio. Strakes make a big difference on a tritoon, there are 2 almost identical tritoons by my grandparents house with Suzuki 250's on the back. to measure speed directly is very accurate. for use in every day domestic and commercial use! Where Power goes when Brakes are Applied on an RC? Enter the following values in to the calculator Engine Revs. Boat Prop Calculator to Help Select the Right Pitch. Prop Size in (mm) This Calculator is to provide a safe conservative prop selection. Please note: It should only be used to confirm predictions. The propeller rpm multiplied by the propeller pitch indicates the distance forward a boat will move forward every minute. Sign in to BoaterInput using the username or email address and password you selected. Does an RC Motor and ESC provide Regenerative Braking. Click the "Register" button or click here to create a free account. This is especially relevant if you ARE hitting the max RPM level established by the engine manufacturer with your current prop. Predicting speed is great for picking out components for a build but using a Bushnell Radar Gun Drive Motors - Single or Twin Drive System It is important to have a lot of experience with Radio Control Brushless boats if using this type of setup. The following equations are used within this calculator: V = [RPM × PP × (1 − (PS/100))] / [GR × C], RPM = [V × GR × C] / [PP × (1 − (PS/100))], GR = [RPM × PP × (1 − (PS/100))] / [V × C], PP = [V × GR × C] / [RPM × (1 − (PS/100))], PS = [1 − (V × GR × C) / (RPM × PP)] × 100. Range for error is extremely small. Visit Radio Control Boat Motor Selection for more details. Speed in km/h and mph is calculated based on the data entered. For instance, if the propeller moves forward 15 inches every time it completes a full turn, the nominal propeller pitch is 15 inches. As such, if an engine has a gear ratio of 2:1, the engine drive shaft will turn twice for every propeller revolution. 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). Normally on the nature of 10 to 20% slower at top speed. The propeller revolution rate is determined by dividing the engine rpm by the gear ratio. They are engine RPM, prop gear ratio (normally for 1.5 to 3.0), prop pitch (the distance that a propeller would move forward in one revolution), prop slip (the efficiency of the prop, lower at high speed, but perhaps very inefficient at low speed) and the boat speed in mph. Visit Radio The true speed of the boat taken at the same throttle setting. It assumes proper hull size, weight and motor size selections with motors larger than the 540 size. KV - The KV value of the motor Is it important to know your prop’s slip? Due to prop slip the boat is actually going slower than the theoretical speed. You can then see what effect changes to weight or power will have on top speed. Of course, most boaters will want something that is in between – good hole shot with acceptable top end speed. The calculator will automatically compute the 5th variable. United States Salary Tax Calculator 2020/21, United States (US) Tax Brackets Calculator, Statistics Calculator and Graph Generator, 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. Select the Hull type to represent slippage. Does a Higher kv make your RC car faster? It is important to have a lot of experience with Radio Control Brushless boats if using this type of setup. This Calculator is to provide a safe conservative prop selection. The pitch indicates the distance that each rotation contributes to the extent to which the boat moves forward on each rotation. If it is the later, then you likely have room to improve your top speed. Knowing the theoretical speed for your boat can help you select the proper pitch. To use our boat prop calculator, you need four inputs: All marine propellers involve a tradeoff. By using known values for the weight, power and speed you can come up with a more accurate constant for your boat. SAW, is for expert boaters. Plug in your info, and click "Calculate" on the item you want to compute. Cell Count - The amount of cells in series Prop Slip Calculator. The result is the propeller slip. Prop Selections will not be calculated for Unloaded RPM's that fall in to the SAW category. 45 MPH) The Gear Ratio between the engine and the prop shaft. Therefore, the first consideration is whether to optimize top speed,  acceleration or some combination of the two. Engines that have a smaller horsepower will have a higher ratio in the region of 2.33:1. Slip is the most misunderstood of all propeller terms, probably because it sounds like something undesirable. C is the constant to convert inches-per-minute of revolution to boat speed V; A collection of really good online calculators. kph, Engine Revs 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. Range for error is extremely small. If there was an absence of slip as the propeller circulates through the water, the boat will, theoretically, move forward at a distance that matches the propeller pitch. Then, this ratio is subtracted from 1. Select the Prop to be used from the drop down menu. Not a member? PP is the blade pitch of propeller (inches). Enter motor KV and Cell Count motor size selections with motors larger than the 540 size. To see the potential impact on top speed, enter your current values for Max RPMs, Gear Ratio, Pitch and Prop Slip in the Boat Prop Calculator tool. (e.g. RPS, Propeller Pitch Conversely, to increase top speed, consider increasing your pitch. (e.g. cm 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. mm. If you prop your boat to maximize top speed, acceleration will be compromised and visa-versa. mph (e.g. Control Boat Motor Selection for more details. GR is the number of revolutions the crankshaft needs to produce one revolution of the prop shaft. 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 engine’s rev-limiter (to protect the engine). Enter any 4 variables and the 5th variable will be calculated. Typically, the slip reduces as the speed increases, generally diminishing to under 10%. 19 Pitch) First you calculate the theoretical speed of the boat by using the following formula, with your calculator: Copyright © 2020 BoaterInput. To use the calculator, input four of the five variables. However, it is not to be confused with propeller efficiency. PS is the index of propeller performance (as a percentage). 2:1) The Pitch of the propeller, measured in inches. Performance levels are determined. Enter The Loaded RPM of the engine BASIC PROP CALCULATOR : Basic Prop Calculator: Determine the correct diameter and pitch of a propeller for any given vessel and engine. Prop Size in (mm) RPM Then, decrease the pitch by an inch or two. Boat Prop Calculator. It is common for 200-HP engines to have a ratio of 1.86:1. Power class is determined by unloaded RPM's only. All Rights Reserved. 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. A propeller pitch can be understood by considering the action of a screw. Select a prop from the list Please note: It should only be used to confirm predictions. Gear Ratio: 1 Propeller Pitch. Propeller slip provides an indication of the efficiency with which a boat is traveling through the water. Boat Speed. The slip can be much higher at lower speeds, often above 50%. kts Propeller slip provides an indication of the efficiency with which a boat is traveling through the water. inch To increase acceleration, consider reducing your pitch. However, it is not to be confused with propeller efficiency. RC LiPo Battery Power & Configuration Calculator, In one of the videos on the RCexplained YouTube ch, RC Drone Max Distance and Maximum Flight time Calculator, Brushless Motor Kv – Measure a Motor’s Kv, Understanding Electricity – For RC vehicles, Measuring Electricity – Voltage, Current, Power, RC Electric Boats – Guide for Successful Electric Boating, RC Sailboat Controls – Radio Layout, Radio Setup. Re: prop slip calculators and boat speed calculators I agree, getting 40+mph out of a 150 on a toon is tough work. Only if you care about insignificant, little items like thrust. Just be sure that whatever size prop you use your engine operates within its recommended RPM range. Propeller Slip % Reference. However, as a result of propeller slip, there is a difference between actual and theoretical speed. V is the speed at which the boat is traveling. The calculator below uses the above formula. SAW, is for expert boaters. Hell, a 3000# mono hull boat won't reach much past 40mph with a 150 on the back.

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