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With such an important, long-term, and expensive upgrade, its never a bad idea to double-check. On the downside, a higher mount can interfere with the boaters steering capabilities. This is the dimension you'll need when selecting a width for your outboard motor's mounting bracket. Industry standards dictate that for short shaft engines the transom height should be 15. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Boat transomangles play a pivotal role in the flexibility of the boats trimming abilities. They keep water out of your prop and increase water pressure in the system. Some fishing boats can handle the motor being underwater. 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. maxTerm: 36, to where the brackets were actually resting on the transom. With more than a decade of experience cruising the lakes in my Crestliner Grand Cayman pontoon boat and my Boston Whaler, I now want to share everything I've learned with my community here at Boating Hub. In addition, motor totes will not harm the finish of the lower unit. Place the rulers end on the ground behind the club and let the club to rest on top of it. Shaft lengths are available in increments of 5. The distance between the ends of a transom is measured in inches. } Expectedly, when the transom angle is zero, it means it is flat. This transom saver will support the weight of your outboard throughout your road travel, steadily bracing it against the trailer frame to relieve your transom of the weight and impact from consistent bouncing. What types of boat need an extra long shaft? Upstream Securitys Disruptive Telematics Technology, The challenges of scaling a cloud-based security system, OneStreams unified platform streamlines financial data management, OneStreams impact on the financial software market. Among them will be first-timers or those who have recently purchased their boats. Take the center measurement from the top to the bottom of the hull. Whats the best height for my boat motor? *The Factors indicates the adjustment affected by on your boat type, the outboard working environment, and the transom distance as discussed above. Measure from the top of the transom to the bottom of the hull. In the second photo, we've measure down from the top of the Detwiler It will ensure that the outboards trim will be effective, and it will save you gas too. This website uses cookies to improve your experience while you navigate through the website. Height Measurement: Recommended Shaft Length: 14" - 17.25" 15" Shaft (Short) 17.25" - 19.5" Varies by application 19.5" - 22.5" xmlHttp.send('{"store_id":"369079","timezone_offset":"-5","timestamp":"2023-03-04T05:39:31.71020200Z","visit_id":"e2642be3-34e5-4a48-b89d-639d139834e0","channel_id":1}'); For vee-shaped hulls, the lowest spot of the hull will come to point, while on flat-bottomed boats it will be more or less level. Then open up the clamp bucket. The pros and cons of properly . publicId: "32bf3437d1346295e03ebcf545f9c839", This is measured by the propeller shaft being parallel to the vessels bottom. These cookies will be stored in your browser only with your consent. This is measured by the propeller shaft being parallel to the vessels bottom. Rebuilt - What You Need to Know, Lower Unit and Sterndrive Break-In Instructions. If we run into that scenario, I would still show you the different options of motors and go over pricing, but I would also ask you to hold off and do one thing before you pull the trigger. The dealer just hit you with the long or short shaft question and you have no clue as to what you need or even what he's talking about. What Kind of Fuel Does Your Marine Engine Need? It is extremely important that the boater understands the significance of the transom's height. With the outboard shaft length too long, meaning the prop is too deep in the water, the engine wont be as efficient, and the fuel burn is high. All things considered, sticking with the industry standard is best for the beginner. s = d.createElement("link"); To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. And the rule of thumb is that you should keep the cavitation plate level with the bottom or keel of the boat. 2019s List of the Best Recreational Pontoon Boats for Sale. Amazon has plate extensions to allow adjustments without buying a new motor: T-H Marine Jack Plate Extension. logoColor: "original", Take your time and understand your boat and your entire transom. This alone can outweigh the negatives when deciding to adjust the mount upwards. A deep Vee hull will result in a different measurement than a flatter . resting on the transom if you had the motor all the way down on the boat ensure that your measurement is accurate. Gear case sits just below or at the hull depth due to the deep v. 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. Engine Oil Type Genuine or Recommended 2str Engine Oil. (1) Multiply the overall length of your boat (in feet) by it's widest beam at the stern (excluding any Fins and or Shear) (2) Locate that value on the left hand vertical column of the chart below. Its still smart to measure it yourself though, just in case, the design changed over the years. This measurement is primarily designed for single motor propulsion. Gear Oil Quantity 195ml(6.6 Fl.oz.) displayPrimeOffers: true, Attention: Remember to measure the outboard shaft length straight up and down instead of measuring along the transom. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. His works have appeared in regional newspapers in North Dakota and in "North Dakota Horizons" and "Cowboys and Indians" magazines. The center is the point where your outboard motor is (ideally) located. Check out the Westshore Marine & Leisure Youtube page! Some may call it a standard length while others may call it a short or a long shaft. Some fishing boats can handle the motor being underwater. How high exactly do you have to raise the transom?-. 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. If you have a short shaft motor, the distance between the top of the transom and the bottom of the boat should be between 15 and 16 inches. (We wont go into name-calling here, but the actual term for the cavitation plate is an anti-ventilation plate.) As a dealer I run into this situation from time to time, which is fine but getting the right length outboard for your boat is crucial. :$I>M W$h"%U_yzIb?]NHg_G|r@nX eTf."SQ 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. steel ruler, etc. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. Setting Height of Outboard Motor - YouTube 0:00 / 0:46 Setting Height of Outboard Motor nates90 71 subscribers Subscribe 83 Share 63K views 7 years ago #boatservice #outboardmotor. Finding the right size is a matter of looking at what youve got and taking out the measuring tape. To make the yard stick long enough to measure the length of all the clubs, tape the ruler to the top. Your at your local outboard dealer shopping for a new motor and the salesman hits you with the question, "short or long shaft?". When fighting waves from the stern, a 20-inch transom is considerably safer. Whether you already own a boat or looking for your first watercraft we are here to service your needs. Measure from the top of the transom to the bottom of the hull. You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. 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. bracket. What is the Virtual Sundance Film Festival? The lowest point will likely be directly under your drain plug if youve got one. In lower mounting, the engine is set lower than the recommended standard. The cookie is used to store the user consent for the cookies in the category "Analytics". On this type of boat, if you are in doubt, default to the longer-shafted outboard. Industry transom height standards have been evolved during the last 30 years: 15 for short shaft engines, 20 for long shaft engines, and 25 for extra-long shaft engines. Safely but briskly accelerate. If it measures 15" or with in a inch of that you will need a short shaft outboard. https://www.bornagainboating.com/Get Your Born Again Boating Clothing! d.addEventListener("DOMContentLoaded", function (e) { endobj This cookie is set by GDPR Cookie Consent plugin. minAmount: 300.0, AztH ^zv_ cT,E1K/rAB54| The vertical distance between the interior of the clamp and the cavitation plate is the shaft length specified by the outboard manufacturer. As a yacht designer and boater, I prefer longer shafts. Your email address will not be published. Two years ago, I bought a Boston Whaler to fish off the coast. maxAmount: 6500.0, relation to pad Remanufactured 4 Cylinder 4-Stroke Cylinder Heads, Remanufactured 6 Cylinder 4-Stroke Cylinder Heads, Trim Relays, Trim Solenoids & Sending Units, Remanufactured V6 & V8 4-Stroke Cylinder Heads, Volvo Cobra SX Bearings and Bearing Carriers, Volvo Cobra SX Driveshaft, U-Joints & Parts, Volvo Cobra SX Transom Assembly & Bellows. This is somewhat similar to #2, in that you are again measuring with a Here are several situations on how you should adjust the outboard shaft length: Mounting the outboard a little bit higher than the standard point could reduce drag, improve RPM at full throttle, and therefore improve speed and make it easier for the boat to get on plane. measuring; you may have to "extend" the flat part of the Learn More About Your Boats Systems By Joining The Born Again Boating Academy! Knowing how this can affect the overall operation of the boat is a factor to be considered. (Putting a All rights reserved. Boats with extended transoms, brackets that extend the mounting bracket for the outboard motor behind the back of the boat, can use a higher outboard height. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. 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. Youll need a short shaft outboard if its 15 or less than an inch shorter. It can also improve the experience of driving a faster boat. This placement is not only recommended but it will give you the best performance compared to something that is too long or too short. It also cuts into speed and fuel efficiency. hulls, such as Allisons, Bullets, Strokers, etc., this measurement could 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. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. 3 0 obj This measurement was approximately 4". If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. The clamp bracket on the latest Mercury Four-Stoke-model outboards has five mounting bolt holes spaced .75 inches apart. However, youll notice a little increase in drag and a decrease in top-end performance. At least if its too long you can raise the motor or "build up" your transom. 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. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. When the boattransom is too low, the motor could end up underwater. (function () { It also includes attaching the right engine. 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). Commonly, the transom angle ranges from 0-30 degrees, with the average transom angle set at 14 degrees. straight edge from the center of the pad, but this time you're measuring These cookies ensure basic functionalities and security features of the website, anonymously. A reversetransom that sits too high can impact the propellers of the motor and motor bracket. It is where the outboard is mounted, and some boat owners place the name of the boat. There is a simple test to see if your outboard motor is set at the best height. parallel with the straight edge. Increased RPM and additional horsepower feed the need for speed. The transom is the "back wall" of your boat, the most rearward part of your hull. This alone can outweigh the negatives when deciding to adjust the mount upwards. Determining Your Boat Transom Angle The transom angle - commonly measured in degrees - is the transom's vertical inclination. My family and I used it to fish, ski (yes, you can ski behind a pontoon boat), and cruise the lakes near our home. Will Charpentier is a writer who specializes in boating and maritime subjects. Mounting the motor lower on the boat transom can create excessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. disregard the "hooks" at the front of the Buying a boat can be an exciting purchase. You A hydrofoil will typically level off the ride by driving the stern up and the bow down, and will stop or considerably minimize porposing on a 16 footer with a mid-sized outboard and no tabs, for example. If you said something smaller than that, thats where it can get tricky. Required fields are marked *. To achieve this, the motor itself has to be attached at the correct height. Increased RPM and additional horsepower feed the need for speed. Pad to bottom of No one wants to have issues with a new transom or boat repairs. The clamp bracket is designed so that the engine's mounting height on the transom can be adjusted higher than standard. document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML = ''; MarinePartsMan.com also says that V6 bass-boat engines have a 20-inch shaft. It is unsafe to have the engine block too close to the water on a low transom. The height is approximately six inches higher than with a propeller. ), Al Shields To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. function loadScript(script) { As a result, the issue is whether my boat need a short shaft or long shaft motor. PayTomorrow.mpeInit({ I mean, who wants to purchase something as expensive as an outboard to only realize you bought the wrong one. The cavitation plate is the horizontal surface of the lower unit immediately above the propeller. Knowing the width, height and depth of your transom allows you to make several important decisions when selecting or purchasing a new outboard. In the case of a dinghy or johnboat, this point may be the top of the transom. If you have a question or need additional information. Measure straight down to the lowest point on the hull. For example, you can have the Mercury outboard shaft length by model code. You need JavaScript enabled to view it. MPW eBay Store - Thousands of New OEM Old Stock Parts! 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. function gtag(){dataLayer.push(arguments);} Raising an outboard higher on the transom can reduce drag and raise top speed. Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. Most of the time, adding a hydrofoil to an outboard improves performance. If youre looking for a bracket that can handle motors of up to 10/15 horsepower, go no further. If you have a fast boat, getting the outboards cavitation plate at the same level of the hull will ensure quick hole shot and fast top-end speeds. Figuring out how to measure motor height on a A reverse transom that sits too high can impact the propellers of the motor and motor bracket. In extremes, the engine can have overheating problems if the boat is raised to a point where the water inlets for the cooling system are out of the water. debugMode: false, Measure from the top of the straight edge to the center of the front })(); This illustration depicts four different outboard mounting height options (courtesy Mercury Marine). Outboard shaft length plays a crucial role in the performance of your boat. <> The greater the number, the more the drive may sway (also called tuck under or negative trim). The motor is what powers the boat so the two go hand-in-hand. Well, raising the outboard motor can be an easy task for you. The motor length corresponds to the transom height of the boat, measured from the keel to gunwale at the transom. However, the motor should not be raised more than 5 inches above the standard position. Generally, short shaft outboards are 15 inches, long shaft outboards are 20 inches, and extra-long outboards are 25 inches. But opting out of some of these cookies may affect your browsing experience. Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. 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. However, there may be times when a boater strays away from these recommendations. The first order of business is to measure your boat for the ideal fit. If your boat planes, pay extra attention to getting the shaft length as close to perfect as possible. The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. Extra-extra long shafts are 30-inches long. Small portable outboards ranging from 2 to 20 horsepower are usually sold only in short or long shaft versions. The transom is the rear wall of the boat where the outboard engine is mounted in the middle. You dont have to be a mathematician to determine the correct boat transomangle. Workboats, sailboats, and displacement-hulled boats fall into this category. Tightening Torque for Engine. How can you figure out what your transom angle is? Check out some hot FAQs to help you get the proper outboard shaft lengths. This distance is very important to the performance of you boat. These allow the mounting of a standard length outboard behind the transom. Like Westshore Marine & Leisure on Facebook! Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. This is handy if youre shopping for second-hand outboards or looking to sell the one that came with your boat. They operate as a planing surface, allowing your boat to climb to the top more quickly. xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); Ill also explain the difference between short and long shafts and how they vary by type of boat. Propshaft in The Effects of Standard, Lower and Higher Mounting. One of the factors in determining the height of the outboard is the placement of the exhaust port on the lower unit of the outboard engine. Cutting the transom down is the only legal method to utilize a short shaft engine on a tall transom. your motor will be higher.) Boats that use longer outboard shafts include: brackets. We also use third-party cookies that help us analyze and understand how you use this website. It does not store any personal data. var prefix = 'ma' + 'il' + 'to'; var interval = setInterval(function () { These are vertically aligned so the boater can make adjustments. #2. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. What's the best height for my boat motor? In lower mounting, the engine is set lower than the recommended standard. What Types of Documents Can be Sent to your Kindle Library? A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. want to measure from the transom to the flat part of this bracket, addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; This allows the engine to idle without the flow of the exhaust being restricted. Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. The propellers will also have trouble reaching the water. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. The performance of these boats depends on quite a lot of factors, but getting the outboard length just right is an essential first step. This would not be a good thing. It is extremely important that the boater understands the significance of the transoms height. However, with the outboard shaft length too short, meaning the prop is too close to the surface, the engine is likely to ventilate and therefore slip on acceleration or lose power. If it measures between 17 and 22, youll want to go with a long shaft motor. Picking the right shaft length for your outboard is an essential step in getting the best performance from your boat. While this is the case there is certain saltwater motors that are extra extra long at 30. var addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = 'info' + '@'; gtag('config', 'G-QX0Y76NH40'); Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. What are Apple Podcasts Subscriptions and Channels? It also cuts into speed and fuel efficiency. The mounting height of an outboard motor can impact the speed and handling characteristics of the boat. The pressure behind your hand dropped as you slid your hand back and forth through the water. Here we look at the effects of standard, lower and higher mounting. With some boats I have a pretty good idea as to what length motor should be hung on them. Beginning boaters should be aware of the boats measurements. Make sure that you are measuring straight up, at a 90 degree angle to Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls.