Prop slip calculator

In reality since the propeller is attached to a shaft it will not actually move forward, but instead propel the ship forward. The distance the ship is propelled forward in one propeller rotation is actually less than the pitch. The difference between the nominal pitch and the actual distance traveled by the vessel in one rotation is called slip.

‎Propeller slip calculator for powerboats Plearse use this calculator to figure out all parameters in regard to pitch, gear ratio, RPM, speed and slip. Enter any four variables, and it will calculate the fifth. Pitch is the theoretical forward movement for one complete turn of the propeller. Every…Whether you’re planning a road trip or flying to a different city, it’s helpful to calculate the distance between two cities. Here are some ways to get the information you’re looking for.‎Propeller slip calculator for powerboats Plearse use this calculator to figure out all parameters in regard to pitch, gear ratio, RPM, speed and slip. Enter any four variables, and it will calculate the fifth. Pitch is the theoretical forward movement for one complete turn of the propeller. Every…What is the average amount of prop slip? I just ran some numbers on mine and am coming up at 33%! I have a 1990 wellcraft nova with a bravo drive and brand...Propeller slip is defined as the loss, expressed in percent, between theoretical boat speed and actual boat speed. The lowest slip is attained by the minimal drag on the boats surfaces (below and above water), the most efficient propellers, and the most efficient engine setup. Engine setup speaks of how the engine is mounted vertically, the ...

You can use our odds calculator above to calculate the implied odds of a given bet as long as you know the odds of the bet. Implied odds are the conversion of a sportsbooks offered odds into an implied win probability. A spread bet in football is normally offered at -110 on both sides of the bet. This gives both outcomes a win probability of 52 ...Propeller Slip is Affected: By factors related to the engine, the boat and the boat set-up: the type of the hull and its condition, the weight and the aerodynamic design of the boat, the design of the engine's lower unit, the mounting height of the engine, the loads as well as the design of the propeller itself. Large diameter propellers have less slip, just like propellers with great amount ...Here's another formula to calculate the mph (with a description of each step); 7100 rpm x 1.18 (v-drive ratio) = 8378 rpm 8378 rpm x 1.25 (prop pitch) (A 15 pitch prop screws itself forward 1.25 ft. per minute each revolution) (60 minutes in an hour) = 628,350 feet per hour 119 mph x .85 *(15% slip factor) = 101.15 mph * The slip factor obviously varies ...Scott Reichow, Mercury’s Prop Guru says “I use the slip calculator daily when assisting customers with propeller questions. It is a great tool that provides much more information than just slip. Results for each of the five fields can be derived by populating the other four.” Scott walked through an outboard example on the Mercury Racing ...A smaller prop requires more power to produce the same thrust as a larger one. For instance, a 12x8 APC E prop takes about 86 W to produce 27 oz of thrust. at 5000 RPM. To produce the same thrust, a 6x4 prop needs …It is important to evenly distribute the weight of all items on board the boat to ensure that the prop is not slipping and the engine is not being overworked. 4. Improper Propeller Sizing. If a propeller is too large or too small, it can cause a decrease in the performance of the boat.Oct 9, 2023 · The calculated value is indicated by the shaded heading in the table. This useful calculator computes the speed-of-advance of a propeller based on: propeller PITCH, in inches. The potential boat speed is then calculated from the speed-of-advance using SLIP, a percentage of lost speed, and unit conversion to boat speed in statute-miles-per-hour. Propeller Slip Calculator; Contact Us; Performance Measured. TrueProp™ Software allows us to intelligently assess damaged props, draft a repair plan and be able to prove compliance with ISO-484 criteria. Measure.Repair.Report. Shop now Performance Measured. TrueProp™ Software allows us to intelligently assess damaged props, draft a …

Prop Slip Calculator Calculate. Featured Story. Prop History. Mercury Racing has a well-earned reputation for handcrafting high-performance and racing propellers that consistently offer unrivaled performance. That reputation is based on more than 50 years of experience. In the mid-1970s, Mercury Hi-Performance (the precursor business to Mercury ...Water displacement on a boat can be calculated by multiplying the boat's length, width, and draft. Here's the formula: Displacement = Length x Width x Draft. Length: The length of the boat, typically measured from the bow (front) to the stern (back) of the boat. Width: The width of the boat, also known as the beam, measured from side to side.Find the perfect propeller for your boat with the Prop Wizard, a free online tool from Turning Point Propellers that guides you through a simple process of selecting the best performance and fuel efficiency.3 oct 2019 ... Maybe the prop slip thing is a carryover from the nautical stuff. https://www.mercuryracing.com/prop-slip-calculator/ Page 148 in the ...Propeller Slip is Affected: By factors related to the engine, the boat and the boat set-up: the type of the hull and its condition, the weight and the aerodynamic design of the boat, the design of the engine's lower unit, the mounting height of the engine, the loads as well as the design of the propeller itself. Large diameter propellers have less slip, just like propellers with great amount ...

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Best Answer. Copy. Slip=100%-Efficiency. Efficiency=Observed Speed or Distance / Engine Speed or Distance. Mean Apparent Slip = Distance Run by Propeller - Distance Run by Ship / Distance Run by ...Go to one of the online prop slip calculators and put your numbers in. On average, you should be see get 8 to 11% and a bass boat setup properly. Something like and STV may get down around 5%, and they definitely can't make more speed than the pitch prop you are running. A 22" prop on that motor at 6,000 rpm would probably be running 55mph.Our Merc Prop Slip Calculator is an online tool designed for ease and accuracy. It leverages a mathematical formula, combining the actual speed of the vessel, …This calculator essentially allows the user to enter their propeller's pitch, gear ratio, engine rpm, actual speed, and then calculate their boat's propeller slip. Why We Love It Calculating the ideal metrics from which a boat will be its most efficient is great the boat's engine, the boater's pocket book, and the environment.

We have the experience and knowlege and lab finishing expertise to get you boat propeller dialed in. Skip to content. Raising The Bar In Propeller Performance! 920-295-4435. Prop Slip Calculator; News; Contact Us; Top Bar - Menu 2 Micro. Facebook page opens in new window Twitter page opens in new window $ 0.00 0. View Cart Checkout. No products ...‎Propeller slip calculator for powerboats Plearse use this calculator to figure out all parameters in regard to pitch, gear ratio, RPM, speed and slip. Enter any four variables, and it will calculate the fifth. Pitch is the theoretical forward movement for one complete turn of the propeller. Every…It is important to evenly distribute the weight of all items on board the boat to ensure that the prop is not slipping and the engine is not being overworked. 4. Improper Propeller Sizing. If a propeller is too large or too small, it can cause a decrease in the performance of the boat.Mercury Racing has released a new propeller-slip calculator app for Apple or Android smartphones. The app has all the functionality of the calculator at mercuryracing.com, which makes propeller testing easier and much more accurate. It can be downloaded for free from Google Play or Apple iTunes. Mercury Racing’s propeller guru, Scott Reichow ...Prop slip calculator Sterndrive Ratio Changes Bravo Drive Failures Alpha Shift Problems Excessive Steam or Smoke Test Sterndrive trim cylinders You are here: Knowledge baseFind your prop slipProp slip calculator Find your propeller slip Use this calculator to figure out just about anything in regard to propeller, ratio, RPM and speed. Jul 8, 2020 · How to use the calculator? It is easier to explain this with a real-time example. I’m considering the same case as the previous example. Let’s consider a quadcopter with 26’’ diameter propeller and take-off weight of 20 kg. The thrust required to hover per propeller is 5 kg. Enter the Diameter and the required thrust per propeller for ... Propeller Slip Calculator Revised 20-APR-2013. Propeller Slip Calculator (PDF Preview) Propeller Slip Calculator (Excel Spreadsheet) (Index) Theoretical Speed Table. We have devloped a Theoretical Speed Table which calculates theoretical speed for various RPM, propeller pitch, reduction and overdrive ratios.Overview. The Mercury Racing Bravo I OC propeller is designed to enhance the performance of single and twin engine two stroke powered catamarans compared to legacy three blade propellers. A shortened exhaust barrel settles the stern, providing natural bow lift for reduced drag and enhanced speeds.Prop Slip Calculator; Step 1. Enter Gear Ratio. Step 2. Enter Pitch. Step 3. Enter RPM. Step 4. Enter Actual Speed. Step 5. Calculate Slip % Get the Latest News from Team Teague! Get Teague Custom Marine's Latest News Delivered to your Inbox. Subscribe. About "One Call Gets it All. We Have Everything But the Water." Information.Slip is the difference between actual and theoretical travel through the water. For example, if a 10-inch pitch prop actually advances 8-1/2 inches per revolution through water, it is said to have 15-percent slip (8-1/2 inches is 85% of 10-inches). Similar to the airplane wing, some angle of attack is needed for a propeller blade to create thrust.Vented Engine Cover - 400R V10. Price: $414.95. Large Canvas Boat Tote - Stone | Black. Price: $32.95. Camelback 20oz Chute Tumbler - Black.Example:- During 24 hrs of a period ship's propeller shaft was observed to turn 87 RPM. the pitch of the propeller was 3.8 m. the observed ships speed over ground was 10 knts. Calculate the value of the propeller slip during this …

Finding the correct propeller for you boat is easy with our Prop Guide. Step 1: Select the Type of Engine. Step 2: Select Engine Manufacturer. Step 3: Select the HP for your marine engine. Step 4: Select the year of your marine engine. If you have the existing part # that is stamped on your boat propeller, you can find all matching props here.

BBLADES is offering a labor rate reduction of just $100.00/hr (regularly $125/hr). This is $25 off of the regular hourly rate. That's a 20% discount! Offer valid from January 2nd until February 28, 2023 (propellers must arrive at BBLADES between the dates January 2 - February 28, 2023 to qualify for the Winter Special offer).An easy alternative to the above slip calculations is to use the Mercury Propeller Slip Calculator (Figure 4-34). This special slide rule lets you quickly calculate propeller slip. (The other side of the slide rule is designed to calculate the performance of a given boat/engine combination when changing to higher- or lower- horsepower engines.)Download Propeller Calc for iOS to propeller slip calculator for powerboatsPlease use this calculator to figure out all parameters in regard to pitch, gear ratio, RPM, speed and...SpitFire X7, a new stainless steel propeller designed to increase speed and acceleration on all boat types with mid-range outboards. The SpitFire X7 is the first propeller for 40 hp CT – 125 hp outboards manufactured with Mercury’s proprietary X7 Stainless Steel Alloy, providing additional strength and durability. A 1.85 ratio with 12" pitch prop at 4400 can only calculate to 25mph at 10% assumed slip. The 1.85 ratio sounds off to me, just seems like a 2.0-2.3 range is more appropriate for a 50hp, but that is just me.Also what is this slip with the prop everyone keeps posting calculations of? alldodge Supreme Mariner Moderator. Staff member. Joined Mar 8, 2009 Messages 39,670. Jul 1, 2022 #2 Slip calculator Enter info you have and then the one you want to find leave it blank and elect that button. Can also do things like what would happen if this one thing ...Mercury Racing has released a propeller-slip calculator app for Apple and Android smartphones.My slip at WOT is 23.5% (5200 rpm), and cruise is around 21% (3600 rpm). Figure the 24-4x4 would get my slip to maybe 18% and if so I would reach just past the 50 mph I have changed many props many times, have a set or 3x3's in 22, 22 cupped, 24 and 26, and the 22 in 4x4Prop Slip Calculator; Used Propeller List; Contact BBLADES Today! Address BBLADES Professional Propellers N5007 Highway 73 Princeton WI 54968-8666; Phone Phone: 920-295-4435 Fax: 920-295-4436 Store Hours Monday - Thursday 8am to 4pm Friday 8am to 1pm Friday 1pm to 4pm by appointment; Find us on:

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Prop Slip Calculator Calculate. Featured Story. Prop History. Mercury Racing has a well-earned reputation for handcrafting high-performance and racing propellers that consistently offer unrivaled performance. That reputation is based on more than 50 years of experience. In the mid-1970s, Mercury Hi-Performance (the precursor business to Mercury ...Then, this ratio is subtracted from 1. The result is the propeller slip. In real life, you also have to do a number of unit conversions between hours, minutes, miles, feet, inches, etc. All of these calculations and conversions are done for you internally in the RBBI Prop Calculator. See our Prop Folder for additional information about propellers. Mercury - Prop Slip Calculator - 90-86147A1. Have Questions? $11.58. $11.03. SKU. 90-86147A1. This product could earn you Points.Prop Slip Calculator Calculate. Featured Story. Prop History. Mercury Racing has a well-earned reputation for handcrafting high-performance and racing propellers that consistently offer unrivaled performance. That reputation is based on more than 50 years of experience. In the mid-1970s, Mercury Hi-Performance (the precursor business to Mercury ...At 5,900 RPM one prop has a prop slip of 8% which means he does 49 MPH. At 6,300 RPM another prop has prop slip of 34% which means he does 43 MPH. Both are 19" pitch props but the 34% prop slip is turning 6,300 RPM. The one with the 9% prop slip is turning 5,900 RPM. The motor they are on is rated for 6,000 RPM.Prop Slip Calculator Calculate. Featured Story. Prop History. Mercury Racing has a well-earned reputation for handcrafting high-performance and racing propellers that consistently offer unrivaled performance. That reputation is based on more than 50 years of experience. In the mid-1970s, Mercury Hi-Performance (the precursor business to Mercury ...Prop Slip Calculator; Step 1. Enter Gear Ratio. Step 2. Enter Pitch. Step 3. Enter RPM. Step 4. Enter Actual Speed. Step 5. Calculate Slip % Get the Latest News from Team …May 24, 2022. #4. The gofast.com calculator is simple. 2.33 is 2.33, RPM is in HZ...5500 is 5500, prop pitch is in inches...19P is 19. Push the title block over Max Speed and you get max speed in MPH....that's a screw turning in wood, not a propeller turning in a movable volume....water. Jump over to your GPS Actual Speed and insert it in MPH. ….

I think the prop slip calculator could possibly "show" a 0% or negative slip in the math, if the advertised pitch is low, or has a ton of cup maybe? But yeah, realistically, I am curious too if a true lower than 1% slip is attainable? Probably too many variables in prop design to definitively say yes? May 17, 2019 #10Prop slip is prop slip but 39% does sound a lot high for a bravo three they tend to run in the 10% or a litle less range. as far as the hole shot s concerned you are at the bottom of the rpm range for those engines and reducing prop pitch will increase rpm and also improve holeshot. Reply. 11-21-2007, 02:14 PM. # 3.The slip of a prop changes with operating conditions. You might find a simple calculator that will give you a rough guide but if you really want to understand how propellers work and do realistic calculations then I recommend you learn about JavaProp:Then, this ratio is subtracted from 1. The result is the propeller slip. In real life, you also have to do a number of unit conversions between hours, minutes, miles, feet, inches, etc. All of these calculations and conversions are done for you internally in the RBBI Prop Calculator. See our Prop Folder for additional information about propellers. The new BBLADES 5-Speed is the latest in the BBLADES family propellers being developed to offer the broadest flexibility in matching purpose-designed propellers that are easily customizable within their performance parameters. The BBLADES 5-SPEED can be demoed through the BBLADES Propeller Test Program and test fee does go towards purchase of ...Propeller Power Curve Computing the load of a propeller by James W. Hebert This article will examine three areas of boat propulsion. ... (RATIO X 1056)) x (1 - (SLIP/100)) The middle term (PITCH/(RATIO X 1056)) is a constant for a particular propeller and engine gear reduction ratio, so we can rewrite as (6) MPH = RPM X (some constant) X (1 ...Prop Slip Calculator; News; Contact Us; Top Bar - Menu 2 Micro. Facebook page opens in new window Twitter page opens in new window $ 0.00 0. View Cart Checkout. ... All Certified Reconditioned propellers and Used propeller sales are final and void of warranty. Click the buttons below to see props by blade count. 3 Blade. 4 Blade. 5 Blade. 6 Blade.The Propeller Slip Calculator can be used to calculate two important numbers - Propeller Slip Range and Desired Propeller Pitch. To calculate your slip percentage: Enter your GPS verified top speed; Enter your drive’s gear ratio; Enter your maximum achieved RPM; Enter the pitch of your current propeller. Divide by 5280 = Miles per minute, multiply x 60 = miles per hour. This can be shortened to (Pitch x RPM) / (Reduction x 1056) = MPH. Slip is figured by comparing this theoretical speed to the actual measured speed. By the way, for these calculations, add 1" to the pitch if your prop is cupped. (Just about all hi-performance props are) Prop slip calculator, Sterndrive. 20". 300-600. 55-80. 15". Right Hand. 8M0125738. Optimize your ride quality and handling with the Bravo Three XR propeller. Take advantage of improved handling and a dryer, more comfortable boating experience., The Mercury Racing Prop Slip Calculator (below) lets you quickly determine propeller slip. Watch the Prop Slip Video CALCULATOR PROPELLER PITCH CALCULATE GEAR RATIO CALCULATE ENGINE RPM CALCULATE ACTUAL SPEED (MPH) CALCULATE PROPELLER SLIP CALCULATE Find My Propeller The Art of Speed, Running through a prop calculator, and ASSUMING a 20% slip at WOT, it works out that it is a 21 pitch prop. I suspect it is a rebuilt propeller of some sort. This prop came on the boat but was not the original, but swapped on as part of the deal with the marina, so I know it is not what came from Crownline, but what achieved RPM that the marina ..., Prop Slip Calculator; News; Contact Us; Top Bar - Menu 2 Micro. Facebook page opens in new window Twitter page opens in new window $ 0.00 0. View Cart Checkout. No ..., Apr 28, 2020 · It makes perfect sense. More weight = more drag = more prop slip. Prop slip IS the variable in boat performance. It accounts for weight, drag, aerodynamics, etc. complied into one variable. That’s why if you’re testing props, to compare performance accurately it needs to be done on the same day, same body of water, same weight etc. , The angle of the propellers aerofoil shape to the propellers axel changes as you move from the Center to the tip. The more pronounced the blade rotation the higher the intended tip speed. From memory having the tip speed running at 1-3 times the the air flow speed is not efficient, but at least the propeller works over a wide range of air speeds., A chart that included the make, model & size boat, twin or tri-toon, strakes or TAP, motor brand, HP and 2 or 4 stroke, size and type prop along with RPM and GPS speed would be invaluable. Re: Propping Chart and information. Got a 18' pontoon with a Suzuki DF70 on it. Just got the motor and have a 13.75x15 on it., ‎Propeller slip calculator for powerboats Plearse use this calculator to figure out all parameters in regard to pitch, gear ratio, RPM, speed and slip. Enter any four variables, and it will calculate the fifth. Pitch is the theoretical forward movement for one complete turn of the propeller. Every…, Raising The Bar In Propeller Performance! 920-295-4435. Prop Slip Calculator. News. Contact Us. No products in the cart. Search. Home. All Props. , ‎Propeller slip calculator for powerboats Plearse use this calculator to figure out all parameters in regard to pitch, gear ratio, RPM, speed and slip. Enter any four variables, and it will calculate the fifth. Pitch is the theoretical forward movement for one complete turn of the propeller. Every…, BBLADES now carries a line of spacer plates for Bravo and Bravo SportMaster drives offered in 1-, 1.5-, and 2- inch varieties that can be tested for 15-days at a cost of $100 per plate. A deposit of $500 is required, but both the deposit and test fee are applied to the purchase price if the spacer plate delivers the desired results., A 1.85 ratio with 12" pitch prop at 4400 can only calculate to 25mph at 10% assumed slip. The 1.85 ratio sounds off to me, just seems like a 2.0-2.3 range is more appropriate for a 50hp, but that is just me., BAM's online boating mega-catalog. All the parts and accessories you need to get on the water FAST! Great prices on great products shipped to you quickly from distribution centers all over the country. Go-Fast.com was our first web site that went online back in 1998. Our propeller slip calculator, boat speed calculator and technical articles ..., Here's another formula to calculate the mph (with a description of each step); 7100 rpm x 1.18 (v-drive ratio) = 8378 rpm 8378 rpm x 1.25 (prop pitch) (A 15 pitch prop screws itself forward 1.25 ft. per minute each revolution) (60 minutes in an hour) = 628,350 feet per hour 119 mph x .85 *(15% slip factor) = 101.15 mph * The slip factor obviously varies ..., Unlike other systems, the BLADES 4-SPEED tunable 7/8″ CAPS is a full 1/4 of an inch larger and the three variable size plugs are made of a pliable rubberized material, meaning they are reusable and can be swapped out while the propeller is still on the drive. The new BBLADES 4-Speed is the latest in the BBLADES family propellers being ..., Prop Slip Calculator Calculate. Featured Story. Prop History. Mercury Racing has a well-earned reputation for handcrafting high-performance and racing propellers that consistently offer unrivaled performance. That reputation is based on more than 50 years of experience. In the mid-1970s, Mercury Hi-Performance (the precursor business to Mercury ..., with an example is given afterwards. This corresponds to chapter 5.1 in Minsaas "Propeller Theory", but be aware that the example in chapter 5.1 have several numerical errors, and the different lines in the example table don't necessarily come in order of calculation. The propeller design calculation consists of three steps: 1., Betting Calculator. Before making any bet, it helps to know what you're risking for the expected payout. Enter Your 'Bet Amount' - that's what you're risking, along with the American, fractional or decimal odds. See what your total payout and winnings will be. Betting Calculator Parlay Calculator., Divide this difference by the actual speed. The number you get is your slip percentage. Slip is never a negative number, and will range from 5% on a light cat to 25% on a heavy workboat. Most hi performance applications will be between 7 and 12 percent. Use this calculator to figure out just about anything in regard to propeller, ratio, RPM and ..., In Israel, the country's central bank said Monday it will sell up to $30 billion in foreign exchange to prop up the shekel, whose value tumbled after the violence began. It also said it will provide up to $15 billion to support market liquidity. The shekel was down 2.3% against the U.S. dollar and back to where it was in 2016., Prop Slip Calculator; News; Contact Us; Top Bar - Menu 2 Micro. Facebook page opens in new window Twitter page opens in new window $ 0.00 0. View Cart Checkout. No products in the cart. $ Search: Search. BBlades Propellers Home; All Props ..., Scott Reichow, Mercury’s Prop Guru says “I use the slip calculator daily when assisting customers with propeller questions. It is a great tool that provides much more information than just slip. Results for each of the five fields can be derived by populating the other four.” Scott walked through an outboard example on the Mercury Racing ..., We have the experience and knowlege and lab finishing expertise to get you boat propeller dialed in. Skip to content. Raising The Bar In Propeller Performance! 920-295-4435. Prop Slip Calculator; News; Contact Us; Top Bar - Menu 2 Micro. Facebook page opens in new window Twitter page opens in new window $ 0.00 0. View Cart Checkout. No products ..., 1. Enter your GPS verified top speed 2. Enter your drive's gear ratio 3. Enter your maximum achieved RPM 4. 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. Propeller Pitch Calculate Gear Ratio Calculate Engine RPM Calculate , A withdrawal slip is a bank document on which a person writes the date, account number and amount of money to withdraw from a bank. It is called a withdrawal slip because it is used to make a withdrawal from a person’s account., kmclemore Site Admin Posts: 5907 Joined: Sun Feb 08, 2004 6:24 pm Sailboat: MacGregor 26X Location: Ambler, PA -- MACX2018A898 w/ Tohatsu 50D -- 78 BW Harpoon 4.6 -- 2018 Tahoe 550TF w/ 150 Merc, Address BBLADES Professional Propellers N5007 Highway 73 Princeton WI 54968-8666; Phone Phone: 920-295-4435 Fax: 920-295-4436 Store Hours Monday - Thursday 8am to 4pm Friday 8am to 1pm, Clutch slipping and clutch drag are two problems that can occur as clutches wear out. They are opposite problems that can occur with any clutch on any type of vehicle and require some type of repair to remedy the problem lest the clutch sys..., We have the experience and knowlege and lab finishing expertise to get you boat propeller dialed in. Skip to content. Raising The Bar In Propeller Performance! 920-295-4435. Prop Slip Calculator; News; Contact Us; Top Bar - Menu 2 Micro. Facebook page opens in new window Twitter page opens in new window $ 0.00 0. View Cart Checkout. No products ..., Unlike other systems, the BLADES 4-SPEED tunable 7/8″ CAPS is a full 1/4 of an inch larger and the three variable size plugs are made of a pliable rubberized material, meaning they are reusable and can be swapped out while the propeller is still on the drive. The new BBLADES 4-Speed is the latest in the BBLADES family propellers being ... , Betting slips are kept locally after a sale. The service benefits buyers because they can get better odds on a wager than they could currently get at a casino. The service collects a 10 percent fee on sale prices. A quick look at the PropSwap marketplace provides a glimpse of numerous bets listed for sale from several sports., Re: Prop Slip Calculator (Largemouthlou) Sorry to invade your space, but I have a question about prop slip. I have a 202 Champion with a 250XB, 27 trophy, I think it is a 1.87 gear, at 5800 rpm I run 82 mph and that comes up to a -4% slip., This calculator is free to use as often as you wish. The calculations and results are based on imperical data and formulas. The results are only as acurate as the data you enter. 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.