Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. It will ensure that the outboards trim will be effective, and it will save you gas too. Mounting the motor lower on the boat transomcan createexcessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. For example, you can have the Mercury outboard shaft length by model code. See When St. Peters Basketball Games Are Today! Learn More About Your Boats Systems By Joining The Born Again Boating Academy! This, however, is not recommended for the beginning boater. 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. 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. You dont have to be a mathematician to determine the correct boat transomangle. The outboard shaft length is the vertical distance between the top of the mounting clamp bracket and the bottom of the cavitation plate (aka the ventilation plate). Take your time and understand your boat and your entire transom. 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}'); 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. Your email address will not be published. Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. | Sitemap, The Marine Parts Warehouse Outboard Museum, OBR Powerhead / Shortblock Warranty Claim Form, Remanufactured vs. 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. All things considered, sticking with the industry standard is best for the beginner. Repowering your boat is one of the most expensive upgrades you can make. This is the dimension you'll need to know when deciding between a short shaft, long shaft or extra long shaft for your outboard motor. Cutting the transom down is the only legal method to utilize a short shaft engine on a tall transom. (3) Move horizontally across the chart until you hit the graph curve. This measurement was approximately 4". "brackets". Some outboards have a serial number that tells you which shaft length to go for. Check out some hot FAQs to help you get the proper outboard shaft lengths. 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. What's the best height for my boat motor? <> To measure your outboard motor shaft length, measure from the bottom of the mounting bracket where it rests on the transom to the top of the cavitation plate, this is the horizontal surface of the lower unit immediately above the propeller. The center is the point where your outboard motor is (ideally) located. It moves an outboard up and down to optimize performance and enable a boat to venture into shallower water than it might otherwise. These are vertically aligned so the boater can make adjustments. Next, measure from your centerline to where the outboard will be mounted on each side. The cookie is used to store the user consent for the cookies in the category "Other. Commonly, the transom angle ranges from 0-30 degrees, with the average transom angle set at 14 degrees. resting on the transom if you had the motor all the way down on the boat He is a Beefier jack plates can be fitted should a boater be looking to mount an outboard with a shorter shaft than their transom demands. Among them will be first-timers or those who have recently purchased their boats. (function (d) { Thats it. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 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. A: The short answer is Yes. Figuring out how to measure motor height on a 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. https:/. debugMode: false, If youre looking for a bracket that can handle motors of up to 10/15 horsepower, go no further. disregard the "hooks" at the front of the There are instances where a lower mount may be okay. This will ensure the best performance. You also might not be able to lift the outboard out of the water entirely for storage. Problems with getting the ventilation plate too low include slower hole-shot and lower top-end speeds. actually have the propshaft above the pad.). Measure the area of the transom directly where the engine will be mounted. Theyre also useful if the back of your boat has a non-standard measurement. When the right length motor is hung on the transom of a boat, the cavitation plate (the large plate that extends out over the propeller) should be even with the very bottom of the boat. |. What is Transom Height? Depending on the manufacturer, size names might change. This was the height of my 225 Yamaha on my TR21 The transom is the back of the boat where the motor is hung. If it measures between 17 and 22, you'll want to go with a long shaft motor. Once you know what will fit on your hull, you can fine-tune your choice based on the performance youre looking for and how you use the boat. Other boats that need extra long shafts are: Read my other articles on outboard motors. The same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. On this type of boat, if you are in doubt, default to the longer-shafted outboard. Small portable outboards ranging from 2 to 20 horsepower are usually sold only in short or long shaft versions. Owners of bass boats, RIBs, or offshore fishing boats need to get this right. You may wonder how deep your prop should be in the water. Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. If you went too long it would still work but it may lack in performance. As summer approaches there will be more boaters taking to the water. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. A transom saver, which can change the spacing between the lower unit and the trailer, negates some of the support. The outboard comes with mounting holes and brackets. and I'll explain it better, (or point you to someone that can help. Other boats that need long shafts are. Its where the outboard motor is attached, and its also where some boat owners put the boats name. You dont have to be a mathematician to determine the correct boat transom angle. By clicking Accept, you consent to the use of ALL the cookies. :$I>M W$h"%U_yzIb?]NHg_G|r@nX eTf."SQ Ideally, you want the outboards cavitation plate, also called the anti-ventilation plate, to be at the same level as the bottom of your hull. var ptScript = "https://cdn.paytomorrow.com/js/pt-mpe.min.js"; So in hopes that this will help out some new boaters this spring, here's a little rundown on outboard shaft sizes and how to figure out which one you actually need. If your boats transom height is 15-16, a short shaft engine is required, and if it is 20-21, a long shaft engine is required. A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. 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). Copyright 1999-2023 Boats Group. All you need to do is measure how much to rise. I also love helping others, which is why I created this website. The propellers will also have trouble reaching the water. If measuring an existing outboard: Measure from the inside top of mounting bracket down to anti-cavitation plate above propeller (this is the largest plate/fin directly above the propeller). bassboat can be a bit confusing at times; hopefully this will help sort This distance is very important to the performance of you boat. Measure from the top of the transom to the bottom of the hull. The height of the boat transom dictates the size of the outboard motor. This alone can outweigh the negatives when deciding to adjust the mount upwards. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. Propshaft in #2. There is a simple test to see if your outboard motor is set at the best height. The performance of these boats depends on quite a lot of factors, but getting the outboard length just right is an essential first step. Small motors built for sailboats might come in a unique configuration with an extremely long shaft since these are mounted higher off the water. <>/Metadata 127 0 R/ViewerPreferences 128 0 R>> ), and place it on the bottom of the pad in the center. (127 mm). 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. However, there may be times when a boater strays away from these recommendations. This is measured by the propeller shaft being parallel to the vessels bottom. As a result, the issue is whether my boat need a short shaft or long shaft motor. I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. A reversetransom that sits too high can impact the propellers of the motor and motor bracket. Step 4. This illustration depicts four different outboard mounting height options (courtesy Mercury Marine). h[0].appendChild(s); addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; On the downside, a higher mount can interfere with the boaters steering capabilities. There is a simple test to see if your outboard motor is set at the best height. If it measures 15" or with in a inch of that you will need a short shaft outboard. The motor is what powers the boat so the two go hand-in-hand. Cavitation plates are used on the bottom components of boats to help them operate better. Knowing how this can affect the overall operation of the boat is a factor to be considered. With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. maxTerm: 36, You can find your Mercury outboard model code on an ID plate or sticker. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". Doing this can have adverse effects. The outboard comes with mounting holes and brackets. Why Rebounding Is A Key Skill for Fouth Players To Learn, Tips For Attacking a Zone Defense as a Youth Basketball Team, Why This is a Big Deal for the Sports Betting Industry. As a dealer I don't really like hearing this because there is a chance it could go either way and you have to get it right. Some may call it a standard length while others may call it a short or a long shaft. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. The amount of degrees the transom leans back from vertical is known as the transom angle. The transom is the rear wall of the boat where the outboard engine is mounted in the middle. The greater the number, the more the drive may sway (also called tuck under or negative trim). Plus, a low transom cut is an invitation for the water to flood the boat. How high exactly do you have to raise the transom?-. Beginning boaters should be aware of the boats measurements. height (that I'm aware of); probably the most common is: Gear Oil Quantity 195ml(6.6 Fl.oz.) All boats are different, and the motor manufacturers produce a variety of standard lengths. e-mail In the second photo, we've measure down from the top of the Detwiler from the transom. To achieve this, the motor itself has to be attached at the correct height. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. Read the following to get the optimal shaft length for outboard motors! Step 2: Three Variables to Consider This measurement would be the inches of manufacturer will recommend the outboard height according to the bracket shape and length. Or it can have an angle degree as high as 30. Mounting the motor lower on the boat transom can create excessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. straight edge on the top of the transom to "extend" it out So from there, I will try to help out by asking questions about your boat such as what type it is and the length. The cookie is used to store the user consent for the cookies in the category "Analytics". Top 10 Choices for Boaters, Mercury Introduces 600HP V12 Verado Outboard Engine, The Outboard Expert: Tohatsu Propane Outboard Engine. On most newer center consoles and offshoreboat transoms might include a rear door leading to a swim platform as well as a molded setback bracket. The correct shaft length for your boat depends on a few factors. What are Apple Podcasts Subscriptions and Channels? Or it can have an angle degree as high as 30. For slower boats, its less critical to. On the downside, a higher mount can interfere with the boaters steering capabilities. Most of the standard engined boats it takes shafts that are 15-30inches long. former editor at Boating Magazine and contributor to many national publications loadScript(ptScript); It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. These cookies track visitors across websites and collect information to provide customized ads. Wherever the outboard clamping bracket is, use this as the basis for measurement. A big NO. If your boat planes, pay extra attention to getting the shaft length as close to perfect as possible. This is probably the worst case scenario out of the two. Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. function gtag(){dataLayer.push(arguments);} It can also improve the experience of driving a faster boat. Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. You need JavaScript enabled to view it. Most of the time, adding a hydrofoil to an outboard improves performance. (Putting a The height of the boat transom dictates the size of the outboard motor. Copyright 2017 Dealer Spike All Rights Reserved. straight edge from the center of the pad, but this time you're measuring In the past, though, it housed the officers and captain of 17th, 18th and 19th century sailing ships. The clamp bracket is designed so that the engine's mounting height on the transom can be adjusted higher than standard. 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. Industry standards dictate that for short shaft engines the transom height should be 15. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. How Transom Height Is Measured if (PayTomorrow) { Engine Oil Mixing Ratio Fuel 50: Engine Oil 1. Engine Oil Type Genuine or Recommended 2str Engine Oil. Measure from the top of the straight edge to the center of the front So how to determine the outboard shaft length? The boat transom can be flat with zero degree angles. Assistant Measuring tape Grease pencil 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. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. 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.

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