Feel free to use this handy calculator to determine the largest outboard engine that is legal for your boat. To be more exact, one horsepower is a unit of measurement equal to 550-foot pounds of “work” per second. To do this, you need to know gasoline weighs approximately 6.1 pounds per gallon, while diesel weighs about 7.2 pounds per gallon. Experience the thrill of building your personalized Formula. Most manuals clearly state the maximum horsepower that the manufacturer deems safe and appropriate for your boat. Today we are gonna work out how to translate pounds thrust to horsepower in the easy way! This calculator is a great screening tool to play around with, but it’s not meant to be a substitute for common sense or an expert’s opinion. Each one of these factors results in an adjustment of the maximum allowed horsepower. Imagine you have a large socket wrench with a two-foot handle.
If not, you can always contact the boat’s manufacturer to inquire about their limits and recommendations for your particular boat model. To convert thrust to horsepower, there are generally two methods. The performance test method is for boats that are 13 feet or less in length, have remote wheel steering, have a maximum capacity of no more than two persons and at least a 19-inch transom height — or at least a 19-inch motorwell height and at least a 15-inch transom height. Don’t have the manual? Here are some things to consider in each of these areas to help you answer the question, “How much horsepower do I need for my boat?”. Horsepower is defined as a unit of power equal to 550 foot-pounds per second used to measure the power of an engine. I did, and I discovered they are written in lawyerly language with a lot of exceptions and footnotes.
For those who prefer exact calculations, Boating magazine has provided some calculations you can use to run some of the numbers. You can be sure horsepower options for each boat model we provide are within the limits we believe maximize your performance while maintaining safety. Through this method, there are very specific instructions for boat preparation addressing everything from motor mounting to fuel tanks to ensure consistency. Putting more horsepower behind your boat may seem like an innocent way to add some excitement to your boating experience, but it could cost you a significant amount of money in fines, lawsuits and damage to your boat. Therefore, he defined one horsepower as 33,000 foot-pounds of work per minute — or 550 foot-pounds per second. Are you using the boat just to cruise with friends and family? Create Your Own Slalom Water Ski Course | Step by Step Guide.
The good news is, these rules are in place for boat manufacturers, so assuming your boat’s manufacturer is following the federal regulations, you can consider the maximum horsepower capacity listed on your boat meets the federal regulation for its maximum horsepower. What’s the equivalent of a 30 thrust trolling motor in HP? However, Watt didn’t let that fact bother him, and it didn’t bother his customers, either. There were a few flaws with this new measurement — the biggest being the assumption that a horse could continue to work at that consistent rate instead of tiring out. I have a 55 lb. Yes, the range is wide, but that’s because boats have a variety of different designs and handle differently. Be minded that all the electric trolling motors measured by pounds of thrust (lbs) are much less powerful than the regular outboard, usually with less than 2 horsepower. Experiments determined one horsepower equals 746 watts of energy. Every time I found an outboard engine that interested me, I had to perform a tedious calculation and refer to the rules to see if it was legal or not. If you’re in an accident, the fact that your boat’s horsepower is above and beyond the manufacturer’s recommendations will be in the accident report. match it to a horsepower capacity according to the Code of Federal Regulations Table 183.53, Horsepower capacity is (raise to nearest multiple of 5). The divisor, 5,252, comes from a series of calculations that convert rpm to radians per second. Whereas the regular outboards (electric or gas) are in horsepower. If you’ve been searching for a boat to purchase, or have reached the point at which you’d like to get a new engine, chances are you’ve asked the question, “How much horsepower do I need for my boat?” While the individual concerns may be different — wanting to make sure there’s enough horsepower or not too much horsepower — it’s a question many people who are interested in purchasing a new boat ask. According to the federal government, yes. Note that personal watercraft do not have a capacity plate. If you’re thinking about installing a bigger engine on your boat, you need to know what the federal regulations say. Searching for thrust to hp in order to get a proper electric replacement for your gas outboard, right? Let’s take the 74 lbs of thrust trolling motor from Minn Kota as an example. If you’re the type of person who doesn’t need precise calculations — or just doesn’t want to be bothered with them — the Boat Trader blog offers a rule of thumb to use when determining the amount of horsepower for your boat. You’ll be calculating the gallons of fuel that are burned per hour (GPH). It means a horse could lift a 550-pound weight one foot in one second. You multiply your boat length by the transom width. The Federal Regulations governing outboard motor horsepower capacity are listed in 33 CFR § 183.53 – Horsepower capacity. It uses the federal regulations to compute the largest outboard engine you’re allowed to install. The measurement of horsepower was converted into other units of measurement. Picking the Best Small Outboard Motor. In recent years, more horsepower hasn’t always meant more weight. A 100# motor might not push a boat any better than a 48# if both use the same prop.
How to Measure Your Outboard Motor Shaft Length How many #’s of thrust equals out to 1 hp? Then you should make a guess as to the efficiency of the motor and there are always other power factors to affect the conversion rate. Here are some common confusions or misunderstandings of the lb thrust to horsepower. There are a few different ways you can define overpowering a boat. I’ve found the manufacturers to be very helpful. Picking the Best Boat for Water Skiing This website uses cookies to ensure you have the best user experience on our website. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. In fact, the amount of thrust delivered by a propeller at a given horsepower is decided by a lot of variables including: You can learn more about the thrust to horsepower calculator with John on this thread. Let’s say, for example, your boat weighs 5,000 pounds, and it has a 300-horsepower engine. So it’s hard to say how much horsepower is a pound of thrust, since there is no precise correlation between thrust and horsepower.
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