The above equation is known as Crouch's formula. WebIt can also be used to calculate the propeller slip, propulsive efficiency and engine power output. No sense spending time and money on something you cant or shouldnt do. Speed = Miles/hour Follow the steps below to calculate boat speed: Calculate the speed of a racing hydroplane having an engine that delivers 3000 hp and displaces 6800 pounds of water. Or, more likely, Arithmeticcalculator.com is the best website that offers a boat propeller calculator. Miles per Hour Calculator. Your boat manufacturer's website will usually hae the boats dry weight, if you do not know it.

Prop Calculator" from Continuous Wave. This one does not require as many numbers but also doesnt give you the most accurate answer.

And plenty of storage room, actually it could be too much room at times. (Overall Rating: 10), When I bought it , it was probably the best deal one could find for a fiberglass bass boat with absolutely no wood in it. The calculations and results are based on imperical data and formulas.

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 https://www.mercuryracing.com/references/signup-form-ty.html, /content/brunswick/mercury-racing/na/us/en/search-results.html. cookie policy. The more detailed the data you provide, the more accurate your prop recommendations will be. The table below has the value of the Crouch constant for different types. Step 2: Insert the boat's displacement, D = 6800 lbs. Too much horsepower can be dangerous. And, just as likely, we dont think we need to. Disclaimer: This calculator should NOT be used as an exclusive decision maker when deciding on a prop for your boat.

I hope you find the calculator useful. google_color_url = "008000"; 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.

Of course, most boaters will want something that is in between good hole shot with acceptable top end speed. Displacement refers to the volume of water your boat displaces. Or, more likely, the calculator on your phone. The gear ratio defines the number of drive shaft revolutions per propeller revolution. Adjustments of -5 to -10% of corrected dyno figures are typical. The general rule of thumb for horsepower is that for each horsepower you need about 5 to 40 pounds of weight.

Multiply mph by 0.85 to determine final boat speed. 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. This one here is really more something you should be aware of. GPS is a good way to figure out your boat speed with no effort. Discover product-related educational content, access to product experts, a searchable history of user-generated questions and answers, and a comprehensive FAQ on our community forum. You can then see what effect changes to weight or power will have on top speed. To be honest our business has changed andwe have not done enough recent testting to update them. Addiction calculator tells you how much shorter your life would be if you were addicted to alcohol, cigarettes, cocaine, methamphetamine, methadone, or heroin. Enter the pitch of your current propeller. In other words, the displacement of a boat is its weight. You can change one parameter and recalculate the rest. Propeller Pitch Calculate Gear Ratio Calculate Engine RPM Calculate

Be sure to take a look at the Prop Slippage for an explanation of how to find your prop slip. WebThe program calculates the theoretical power required to drive the selected hull form through calm water at the required speed.