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If you are looking to repower, they may be able to offer some sage advice. Most of the standard engined boats it takes shafts that are 15-30inches long. There is a simple test to see if your outboard motor is set at the best height. A yardstick will help you determine if your outboard engine is at the right height. Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. Brackets are also handy for boats that do not have flat transoms, like canoe-stern sailboats or fan-tailed motor vessels. This could also affect your travelling capabilities on the boat trailer. August 9/08). Sailboats use these sometimes, as well as some boaters who want to install a much smaller auxiliary motor to use in case of primary engine failure. The most common percent angle is probably 12, however spec sheets for O/B and I/O boats may show 10 percent, 12 percent, and 14 degrees. There are instances where a lower mount may be okay. With it comes a lot of responsibility and new things to learn includingboat maintenanceand boat basics. The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. (Putting a 5/rC,aQhsK@Q. This cookie is set by GDPR Cookie Consent plugin. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. You'll need a short shaft outboard if it's 15 or less than an inch shorter. The clamp bracket on the latest Mercury Four-Stoke-model outboards has five mounting bolt holes spaced .75 inches apart. As summer approaches there will be more boaters taking to the water. Again, make sure that you are measuring to the flat part of the brackets; resting on the transom if you had the motor all the way down on the boat It is where the outboard is mounted, and some boat owners place the name of the boat. We also use third-party cookies that help us analyze and understand how you use this website. Expectedly, when the transom angle is zero, it means it is flat. The boater must also consider if the boat transomsupport is designed to bear the weight of a higher mount. Many boat transoms are modified to use a different length of outboard by using a bracket. The distance between the ends of a transom is measured in inches. It is extremely important that the boater understands the significance of the transoms height. I hope this helps someone out in their search for a new or newer outboard this season. High powered boats usually only come in long and extra-long variants. Actual shaft length is 21.5" on those. The cavitation plate is the horizontal surface of the lower unit immediately above the propeller. storeDisplayName: "Marine Parts Warehouse", When the jet drive is on the motor, set the height so that the leading edge of the intake is flush with the boat bottom. A: The answer varies by boat, but here are some rules of thumb for matching a short shaft outboard to your boat. Over time, Boating Hub has grown into a resource for boating enthusiasts around world. When it gets to the short side (14), When the inner corner of the square comes into touch with the transom, measure the distance between the inside corner of the square and the boat bottom (see drawing below). will be to the flat part; if you measure to the bottom of the brackets The height of the boat transom dictates the size of the outboard motor. Here we will guide you in how to get the right boat transom height. https:/. Ask a friend to hold one end of a measuring tape at the extreme outer edge of the top of the transom while you pull the tape across its width to the opposite outer edge to measure the "length of the taffrail," which is the width of the boat across the top edge of the stern. This exhaust port should be about 1 inch above the water line when the boat is idling. The height of the boat transom dictates the size of the outboard motor. If it measures 15" or with in a inch of that you will need a short shaft outboard. In lower mounting, the engine is set lower than the recommended standard. Eq*^?6R83e+j}UY.(M7k]~4g)g ~wmS{ O7t/o(W|X? Offshore vessels are often equipped with a large mounting bracket so that the transom can be left at full height. The first step is to determine the height of your boat's transom. The average transom angle is around 14 degrees. The vertical distance between the interior of the clamp and the cavitation plate is the shaft length specified by the outboard manufacturer. Safely but briskly accelerate. debugMode: false, Measure from the top of the transom to the bottom of the hull. Sluggish speeds, poor handling, heavy spray, porpoising, or even water pushing up into the cowling are all signs that an outboard is set too low. var prefix = 'ma' + 'il' + 'to'; While this is the case there is certain saltwater motors that are extra extra long at 30. However, your boat will have slightly more drag which will reduce your maximum speed. Finding the right size is a matter of looking at what youve got and taking out the measuring tape. The form of a boats transom varies depending on the manufacturer and model. }, 100); s.setAttribute("rel", "stylesheet"); Any questions? measuring; you may have to "extend" the flat part of the Two years ago, I bought a Boston Whaler to fish off the coast. They operate as a planing surface, allowing your boat to climb to the top more quickly. You need JavaScript enabled to view it. Trimming in, trimming down, and trimming out are all terms that a beginning boater should learn. If youre going the other way around and trying to figure out how long the shaft on your outboard is, measuring it is equally easy. So you should just measure the height of the boats transom from the center down to the lowest point of the hull, and compare transom height with the outboard shaft length numbers. The mounting height of the outboard engine is the equivalent of the distance between the base of the motor and the top of the propeller. If youd like to see this in video format, skip to 0:44 in the below YouTube Video: Is it OK to put a long shaft outboard on a boat thats rated for a short shaft? But opting out of some of these cookies may affect your browsing experience. The transom is the rear wall of the boat where the outboard engine is mounted in the middle. Among them will be first-timers or those who have recently purchased their boats. Boats with more engine power and weight require longer shaft outboards for better balance. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Required fields are marked *. Necessary cookies are absolutely essential for the website to function properly. Since the length of the shaft of your outboard is associated with the size boat, smaller engines will generally have shorter shafts. 3 0 obj Having the cavitation plate a bit lower than the transom is preferable to having it too high. So if you are measuring the outboard shaft length for smaller boats, inflatables, dinghies, sailboat or other low-speed work boats, the cavitation plate is often about 2 below the bottom. The average transom angle is around 14 degrees. If you said something smaller than that, thats where it can get tricky. The transom is the back of the boat where the motor is hung. With the motor trimmed so that the propshaft is parallel to the keel, the anti-ventilation plate should be just about even with your straight edge, and thus even with the boat bottom at the keel. ensure that your measurement is accurate. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. |. window.dataLayer = window.dataLayer || []; Step 4. function loadScript(script) { I live for the weekends when I can go out on the water and escape the stress of life on land. PayTomorrow.mpeInit({ }) } }); })(document); The height of the transom is calculated by measuring from the bottom of the hull to the top of the transom, using the center line. What is the Virtual Sundance Film Festival? So how to determine the outboard shaft length? The cookie is used to store the user consent for the cookies in the category "Performance". The height of the transom is calculated by measuring from the bottom of the hull to the top of the transom, using the center line. function mpeInit() { Adjusting the mounting height of an outboard on the boat transom can affect performance and every boat can be different, so actual on-water testing is best. Thats it. The propellers will also have trouble reaching the water. Industry standards dictate that for short shaft engines the transom height should be 15. var ptScript = "https://cdn.paytomorrow.com/js/pt-mpe.min.js"; He is also a certified marine technician and the author of a popular text on writing local history. This cookie is set by GDPR Cookie Consent plugin. The shaft length for outboard motors has nothing to do with the water line. Step 2 requires the propeller's radius (check the user manual and then the technical drawing). If mounting directly to a boat transom: Measure from the top of the transom down to the bottom of the hull or keel (lowest point). The cookie is used to store the user consent for the cookies in the category "Analytics". How can you figure out what your transom angle is? on How to Measure Outboard Shaft Length: The Only Guide You Need, ePropulsion vs Torqeedo: An All-Round Comparison, 55 lb Thrust Trolling Motors: All You Need to Know Before Purchase, Spot Lock Trolling Motor: Is It Worth It & Best Options in 2022, Wiring 24V Trolling Motors: 24 Volt Wiring Diagram (with Video), LiFePO4 Battery: Why Lithium iron Phosphate Batteries Are Your Best Options in 2022, Minn Kota vs MotorGuide: Best Option in 2022. See diagram below. Plus, a low transom cut is an invitation for the water to flood the boat. Among them will be first-timers or those who have recently purchased their boats. All you need to do is measure how much to rise. For most boaters this is a no brainer, but for the novice or inexperienced boater it may be a tougher question. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. See When St. Peters Basketball Games Are Today! Doing this can have adverse effects. from the transom. No matter what size of boat you are running, one of the most critical choices you can make when buying an outboard motor is the shaft length. Ten years ago I bought my first boat. If so, send me an The anti-cavitation plate above the prop needs to be within an inch of the bottom of the transom, therefore, the prop should be well below the transom. Extra-long shafts are 25-inches long. Learn More About Your Boats Systems By Joining The Born Again Boating Academy! In step 3, add another 10 cm (4") to the previous calculation in order to develop the ideal shaft length. The lowest point will likely be directly under your drain plug if youve got one. up to the bottom of the motor brackets, (as in #1). These cookies track visitors across websites and collect information to provide customized ads. With such an important, long-term, and expensive upgrade, its never a bad idea to double-check. } The height of the transom is calculated by measuring from the bottom of the hull to the top of the transom, using the center line. The Effects of Standard, Lower and Higher Mounting. I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. If you have an outboard motor, the distance from one end to another will be found on the side or on a label near its bottom. What Types of Documents Can be Sent to your Kindle Library? want to measure from the transom to the flat part of this bracket, A deep Vee hull will result in a different measurement than a flatter . The same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. Mounting the motor lower on the boat transomcan createexcessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. I would ask you to go back and measure the transom of your boat. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. If you are running a slower boat, the exact location of the ventilation plate is less important. Or it can have an angle degree as high as 30. MarinePartsMan.com also says that V6 bass-boat engines have a 20-inch shaft. This is a measurement that has been used for BassCats, I'm Engine Oil Type Genuine or Recommended 2str Engine Oil. Typical motor lengths include the following. Top 10 Choices for Boaters, Mercury Introduces 600HP V12 Verado Outboard Engine, The Outboard Expert: Tohatsu Propane Outboard Engine. 12 Small Fishing Boat Accessories to Buy Today. This email address is being protected from spambots. Lubrication System Engine Oil Mixed Gasoline. Follow Westshore Marine & Leisure on Twitter! Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. Place the clubs bottom on the ground as though it were going to be used to strike a golf ball. The transom is the flat vertical section at the rear of the boat. Knowing how this can affect the overall operation of the boat is a factor to be considered. Usually speaking, the farther the outboard is set off the transom, the higher the propeller should be in the water (or the higher the outboard can be mounted). } Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. In the case of a larger offshore boat, it may be to the top of a cutout on the . It also decreases the boats lift and increases the time it takes for the boat to reach plane. The cookie is used to store the user consent for the cookies in the category "Other. No one wants to have issues with a new transom or boat repairs. var interval = setInterval(function () { There are 2 steps to help get a relatively accurate figure. Safely but briskly accelerate. var BCData = {"csrf_token":"d7ecb6b56891bb66aee12dbc01a80162b3ed582c1acbe30f16fc9f1b2abc362f"}; Now that you have a better understanding of boat transom heights its time to take out the ruler and get the perfect measurements. Check the literature about your model boat online, and you may be surprised to find that the number is published for you. Later in the article is an image that shows you exactly where to measure. Then, you can pick the right engine. Buying a boat can be an exciting purchase. A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. This would not be a good thing. 2 0 obj (3) Move horizontally across the chart until you hit the graph curve. Measuring the shaft length can be done in various ways, but the most common way is by using a tape measure. It is very versatile as it generally . Why wont Touch ID be under the screen in the iPhone 15 and iPhone 16? Look at the part of your motor that would be Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. To sum up, there is a simple calculator of the shaft length for outboard motors: Outboard Shaft Length = Transom Height +/- Factors. Move the bracket as close to the center of the transom as possible while still maintaining clearance to allow the main outboard or rudder to reach its full range of motion without contacting the kicker motor. Higher mounting decisions should be left to the professionals. Whether you already own a boat or looking for your first watercraft we are here to service your needs. if (PayTomorrow) { However, youll notice a little increase in drag and a decrease in top-end performance. publicId: "32bf3437d1346295e03ebcf545f9c839", For slower boats, its less critical to. The first order of business is to measure your boat for the ideal fit. However, there may be times when a boater strays away from these recommendations. I mean, who wants to purchase something as expensive as an outboard to only realize you bought the wrong one. The height of the boat transom dictates the size of the outboard motor. For over five years he has worked as a newspaper reporter and historic researcher. Increased RPM and additional horsepower feed the need for speed. If you go too short your more than likely going to cavitate and loose power. The standard installation of an outboard has the top of the transom of the boat at the same level as the bottom of the motor portion of the outboard. Measure from there down to the top of the cavitation plate, also known as the anti-ventilation plate. Most transom savers can support up to a 150HP motor, which is sufficient for most regular boats. The amount of degrees the transom leans back from vertical is known as the transom angle. Boat Transom Heights The Beginners Guide, Buying a boat can be an exciting purchase. This is probably the worst case scenario out of the two. The propellers will also have trouble reaching the water. But, how do you measure it? These cookies will be stored in your browser only with your consent. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. Here we will guide you in how to get the right boat transom height. You dont have to be a mathematician to determine the correct boat transom angle. The performance of these boats depends on quite a lot of factors, but getting the outboard length just right is an essential first step. Step 2: Three Variables to Consider On the downside, a higher mount can interfere with the boaters steering capabilities. mpeInit(); Propshaft in Knowing the width, height and depth of your transom allows you to make several important decisions when selecting or purchasing a new outboard. You can use a longer shaft than recommended and your boat will work fine. Check out the Westshore Marine & Leisure google plus page! primeApr: 12.99, These cookies ensure basic functionalities and security features of the website, anonymously. var h = d.getElementsByTagName("head"), Always weigh the risks of making adjustments. You also might not be able to lift the outboard out of the water entirely for storage. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. The boat transom can be flat with zero degree angles. Height Measurement: Recommended Shaft Length: 14" - 17.25" 15" Shaft (Short) 17.25" - 19.5" Varies by application 19.5" - 22.5" And thats usually the case since the electric outboards are designed with larger and more efficient propeller that needs longer shaft. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. This is handy if youre shopping for second-hand outboards or looking to sell the one that came with your boat. You also have the option to opt-out of these cookies. Measure from the top of the transom to the bottom of the hull. Selecting the Correct Size Outboard Shaft, What is the Best Outboard Motor for Saltwater, Diagnosing Common Outboard Motor Problems, Best Beginner Boats Everything You Need to Know. With some boats I have a pretty good idea as to what length motor should be hung on them. According to MarinePartsMan.com, the outboard can be raised 1 inch above the standard height for every 10 miles per hour of speed the boat can attain. (We wont go into name-calling here, but the actual term for the cavitation plate is an anti-ventilation plate.) % Chances are the boat was designed with a specific size of outboard in mind. Actually there is no designated letter for short shaft. This restriction includes most fishing boats and longer sailboats. What Kind of Fuel Does Your Marine Engine Need? Hold the tape on the top, center of the taffrail and measure straight down to the point, usually a sharp angle, where the transom joins the bottom of the boat. This will ensure the best performance. Some outboards have a serial number that tells you which shaft length to go for. Add the two measurements and you get 6 1/2". To do so, take a measurement from the very top to the very bottom of the transom in the precise center. And the rule of thumb is that you should keep the cavitation plate level with the bottom or keel of the boat. So how to measure outboard shaft length? With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. He is a var addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = 'info' + '@'; bracket forward with a straight edge to where you can then measure up Lastly, knowing the year of your motor and what style of controls you have (side mount, concealed side mount, or binnacle) is also a plus because it will tell the dealer if your current controls are compatible with the motor you are purchasing. It can also improve the experience of driving a faster boat. actually have the propshaft above the pad.). When the boat transom is too low, the motor could end up underwater. Analytical cookies are used to understand how visitors interact with the website. You dont have to be a mathematician to determine the correct boat transomangle. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. When measuring the transom height, you should start from the hull's bottom at the boat's center line up to the top of the transom. Mounting the outboard motor in accordance with the industry standards is important. With a motor tote, the outboard and boat move as one, independently of the trailer, so there are no concerns about the boat shifting on the trailer, he says. Pretty easy to figure out but like I said its crucial to pairing a motor with a boat. Read the following to get the optimal shaft length for outboard motors! If it measures 15" or with in a inch of that you will need a short shaft outboard. The boater must also consider if the boat transom support is designed to bear the weight of a higher mount. A reverse transom that sits too high can impact the propellers of the motor and motor bracket.