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It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. The pressure behind your hand dropped as you slid your hand back and forth through the water. If the propeller fails to ventilate, the motor is mounted to low. 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. 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. (616) 364-0666, On all contiguous US part orders over $100. 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. 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. The boater must also consider if the boat transomsupport is designed to bear the weight of a higher mount. 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. Cutting the transom down is the only legal method to utilize a short shaft engine on a tall transom. 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. (3) Move horizontally across the chart until you hit the graph curve. The height is approximately six inches higher than with a propeller. Using your existing control box and gauges will save you quite a bit of money in the end. Each one has a totally different effect on the boats performance. Propshaft in Gear case sits just below or at the hull depth due to the deep v. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Pad to bottom of A transom saver, which can change the spacing between the lower unit and the trailer, negates some of the support. Knowing how this can affect the overall operation of the boat is a factor to be considered. This is measured by the propeller shaft being parallel to the vessels bottom. Many single-engine boats mount a smaller auxiliary motor for emergency use. The outboard comes with mounting holes and brackets. minAmount: 300.0, The propellers will also have trouble reaching the water. Thats a fairly simple list of symptoms, but if your motor is too low, youll probably notice at least one of them. Boost Speed with Outboard Engine Height Adjustments What Is the Transom of a Boat? EXPLAINED - My Cruiser Life The prop will be in cleaner, harder water as it advances farther aft, making it more efficient. Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. This is somewhat similar to #2, in that you are again measuring with a The shaft length for outboard motors has nothing to do with the water line. Measure from there down to the top of the cavitation plate, also known as the anti-ventilation plate. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. 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. of the "bullet" on your lower unit. How do you measure a transom on an outboard motor? Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Well, raising the outboard motor can be an easy task for you. You need JavaScript enabled to view it. Outboard Motor Shaft Length: How do I measure? The height of the boat transom dictates the size of the outboard motor. The transom is the flat vertical section at the rear of the boat. All rights reserved. function loadScript(script) { The engine must be linked to the transom at the proper height for a propeller to best meet specific boating demands. 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. Doing this can have adverse effects. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. }) } }); })(document); Where Onboard a Boat is the Transom Located and More About Transom Heights A propeller operates based on the height of the transom. the propshaft below or above the pad. The height of the boat transom dictates the size of the outboard motor. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. Actually there is no designated letter for short shaft. Your email address will not be published. Plus, a low transom cut is an invitation for the water to flood the boat. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. to where the brackets were actually resting on the transom. How To Measure Outboard Motor Shaft Length [Long v Short] - Boating Hub Measure from the top of the straight edge to the center of the front This email address is being protected from spambots. (In the case of the faster All things considered, sticking with the industry standard is best for the beginner. })(); You reply, "Im not sure, I think its a long". #1: Height His works have appeared in regional newspapers in North Dakota and in "North Dakota Horizons" and "Cowboys and Indians" magazines. You dont have to be a mathematician to determine the correct boat transomangle. 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. This was the height of my 225 Yamaha on my TR21 All boats are different, and the motor manufacturers produce a variety of standard lengths. 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. This is also known as the shaft length. Follow Westshore Marine & Leisure on Twitter! help with shaft length for a kicker - iboats Boating Forums Ten years ago I bought my first boat. The motor length corresponds to the transom height of the boat, measured from the keel to gunwale at the transom. However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. These allow the mounting of a standard length outboard behind the transom. brackets. Knowing the width, height and depth of your transom allows you to make several important decisions when selecting or purchasing a new outboard. A: The answer varies by boat, but here are some rules of thumb for matching a short shaft outboard to your boat. Boat Transom Heights The Beginners Guide, Buying a boat can be an exciting purchase. These cookies ensure basic functionalities and security features of the website, anonymously. You need JavaScript enabled to view it. Step 2 requires the propeller's radius (check the user manual and then the technical drawing). Generally, short shaft outboards are 15 inches, long shaft outboards are 20 inches, and extra-long outboards are 25 inches. So if you are measuring the outboard shaft length for the powerboat, planing boat, or any boat for which the speed is the priority, take the outboard shaft length 1 to 1.5 (depending on your boat types) shorter than standard would be better. There 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. (We wont go into name-calling here, but the actual term for the cavitation plate is an anti-ventilation plate.) var h = d.getElementsByTagName("head"), would be more accurate.) Yes, if there is adequate space while the engine is tilted in the up position, a larger shaft length than what is specified may be used. Although the longer outboard shaft length can lead to lower speed and more drag, the boat can push a heavier load. The correct shaft length for your boat depends on a few factors. 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. The flat part of the bracket that rests on the transom when mounted will give you the same point of reference as the transom does on the boat. Variables to consider when determining the mounting height include the size and style of the boat and the length of the outboard motor's shaft. How can you figure out what your transom angle is? debugMode: false, This allows the engine to idle without the flow of the exhaust being restricted. Knowing how this can affect the overall operation of the boat is a factor to be considered. With the long side (22 1/2), place a carpenters square ) in opposition to the keel. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. If it measures between 17 and 22, you'll want to go with a long shaft motor. Buying a boat can be an exciting purchase. Boats with more engine power and weight require longer shaft outboards for better balance. This would not be a good thing. Most transom savers can support up to a 150HP motor, which is sufficient for most regular boats. Whether you already own a boat or looking for your first watercraft we are here to service your needs. It is extremely important that the boater understands the significance of the transom's height. If you go too short your more than likely going to cavitate and loose power. Industry standards dictate that for short shaft engines the transom height should be 15. logoColor: "original", Outboards designed for saltwater applications usually have longer shafts. The performance of these boats depends on quite a lot of factors, but getting the outboard length just right is an essential first step. The brackets can add 1 inch to the overall mounting height of the outboard. 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 Factors indicates the adjustment affected by on your boat type, the outboard working environment, and the transom distance as discussed above. :$I>M W$h"%U_yzIb?]NHg_G|r@nX eTf."SQ Higher mounting decisions should be left to the professionals. Safely but briskly accelerate. var BCData = {"csrf_token":"d7ecb6b56891bb66aee12dbc01a80162b3ed582c1acbe30f16fc9f1b2abc362f"}; 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. Before we get started lets see what a boat transom is and what it does. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. The height of the boat transom dictates the size of the outboard motor. Boaters who consider going with a higher mount can see increased speeds. xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); In lower mounting, the engine is set lower than the recommended standard. I show you how to consistently measure your prop to pad height. Smaller boats may use adjustable jack plates that can be changed to fit any outboard. What types of boat need an extra long shaft? 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 mounting height of an outboard motor can impact the speed and handling characteristics of the boat. 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. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. So its easier and safer to communicate with the dealer with the exact measurement of outboard shaft length in order to get the right model. Determining Your Boat Transom Angle The transom angle - commonly measured in degrees - is the transom's vertical inclination. A1: Broadly speaking, the outboard motor shaft length for pontoon boat, bass boat, or other larger boats should be long shaft. var h = d.getElementsByTagName("head"), Read the following to get the optimal shaft length for outboard motors! measuring; you may have to "extend" the flat part of the Transom Outboard Engine Position - YouTube 0:00 / 0:56 Transom Outboard Engine Position BOATING SCENE 763 subscribers 609 211K views 5 years ago www.boatingscene.com.au Sometimes when your. The cavitation plate is the horizontal surface of the lower unit immediately above the propeller. Shaft lengths are available in increments of 5. Triton. You can find your Mercury outboard model code on an ID plate or sticker. With it comes a lot of responsibility and new things to learn including, Why your boat transom needs to be the right height, The pros and cons of properly mounting the outboard motor to the transom, Standard mounting is always best for the beginner, Of course, its always best to go with standard practices when choosing the, Lower mounting is not for the beginning boater, Mounting the motor lower on the boat transom, There is a simple test to see if your outboard motor is set at the best height. We also use third-party cookies that help us analyze and understand how you use this website. storeDisplayName: "Marine Parts Warehouse", Problems with getting the ventilation plate too low include slower hole-shot and lower top-end speeds. Repowering your boat is one of the most expensive upgrades you can make. (Any measurement given as "off the transom" This illustration depicts four different outboard mounting height options (courtesy Mercury Marine). Use the mounting bracket on the motor to know where it will sit on the boat. 3 0 obj I mean it is better to be safe than sorry, am I right? If your outboard motor height. Analytical cookies are used to understand how visitors interact with the website. How the outboard will sit on the back of the boat depends on how the transom is designed. 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 hope this helps someone out in their search for a new or newer outboard this season. If your boat is newer and the manufacturer is still in business, you might also want to try to give them a call. What Types of Documents Can be Sent to your Kindle Library? I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. relation to pad Expectedly, when the transom angle is zero, it means it is flat. You can use a longer shaft than recommended and your boat will work fine. My family and I used it to fish, ski (yes, you can ski behind a pontoon boat), and cruise the lakes near our home. A yardstick will help you determine if your outboard engine is at the right height. 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 propellers will also have trouble reaching the water. See When St. Peters Basketball Games Are Today! This could also affect your travelling capabilities on the boat trailer. What Is Boat Transom Height? | Gone Outdoors | Your Adventure Awaits Here we will guide you in how to get the right boat transom height. Remember, if you use a longer outboard shaft than you need you will be increasing your draft. Pretty easy to figure out but like I said its crucial to pairing a motor with a boat. Copyright 2017 Dealer Spike All Rights Reserved. This website uses cookies to improve your experience while you navigate through the website. <>/Metadata 127 0 R/ViewerPreferences 128 0 R>> Its important to note that manufacturers call their models different things. You But, how do you measure it? Eq*^?6R83e+j}UY.(M7k]~4g)g ~wmS{ O7t/o(W|X? This cookie is set by GDPR Cookie Consent plugin. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. 5/rC,aQhsK@Q. ), and place it on the bottom of the pad in the center. However, you will need an understanding of how the degrees will alter the boats usability. Doing this can have adverse effects. since 1986. Of course, its always best to go with standard practices when choosing thebest boat engine. Mounting kicker motor - General Discussion Forum | In-Depth Outdoors Doing so, will put the propeller right below the boat. Re: Dinghy with a long shaft motor? It can also improve the experience of driving a faster boat. not sure that it's still used. So how to determine the outboard shaft length? 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. The distance between the ends of a transom is measured in inches. In the second photo, we've measure down from the top of the Detwiler It also cuts into speed and fuel efficiency. 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. function gtag(){dataLayer.push(arguments);} This will keep the prop in the water when the boat pitches in waves, or hobby-horses. The Best Way to Measure Prop to Pad | How to measure Outboard Motor Height 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. However, there may be times when a boater strays away from these recommendations. publicId: "32bf3437d1346295e03ebcf545f9c839", A deep Vee hull will result in a different measurement than a flatter . Here is a picture that shows you exactly where the outboard motor shaft length stands: Usually the shaft length for outboard motors falls into the following 4 sizes: In practice, you may find the outboard motor shaft length varies among different brands and manufacturers like the Honda,Suzuki, Yamaha, Torqeedo, etc. Or measure from the main engine prop up to the water line? PayTomorrow.mpeInit({ While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. straight edge on the top of the transom to "extend" it out stream How To Mount An Outboard Motor Properly - Start to Finish! Now that you have a better understanding of boat transom heights its time to take out the ruler and get the perfect measurements. motor brackets The cookie is used to store the user consent for the cookies in the category "Performance". your motor will be higher.) Cavitation is when the propeller is out of the water due to the boat forming a wake of "air bubbles" or "vapor cavities" around the prop. If it measures 15" or with in a inch of that you will need a short shaft outboard. This could also effect your travelling capabilities on the boat trailer. It varies between different motors and boats. With some boats I have a pretty good idea as to what length motor should be hung on them. It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. Since the ventilation plate & foil are burried under water it is obviously too low. (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. xmlHttp.setRequestHeader('Content-Type', 'application/json'); Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. An inch or two probably wont make a big difference, but any more than that will lead to trouble. https://www.bornagainboating.com/Get Your Born Again Boating Clothing! Mounting the outboard motor in accordance with the industry standards is important. What is a Transom Saver And Do I Need One? - Boat Safe (function () { There are instances where a lower mount may be okay. boats.com, 1221 Brickell Avenue, 23rd Floor, Miami, FL 33131, USA. Your email address will not be published. How to Measure Outboard Shaft Length: The Only Guide You Need If you have a jackplate, you may have to get a bit creative in your There is a simple test to see if your outboard motor is set at the best height. Brackets are also handy for boats that do not have flat transoms, like canoe-stern sailboats or fan-tailed motor vessels. Next, measure from your centerline to where the outboard will be mounted on each side. Other boats that need extra long shafts are: Read my other articles on outboard motors. The collapsing bubbles are loaded with extremely low-pressure water vapor, which causes damage to a variety of surfaces as they collapse. disregard the "hooks" at the front of the This will be the When the boat transom is too low, the motor could end up underwater. Place the bracket on the transom to the left of the main outboard or rudder. s = d.createElement("script"); Save my name, email, and website in this browser for the next time I comment. When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. maxMicroAmount: 0.0, I live for the weekends when I can go out on the water and escape the stress of life on land. Before we get started lets see what a boat transom is and what it does. mpeSelector: ".pt-mpe", "brackets". The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". clearInterval(interval); Wherever the outboard clamping bracket is, use this as the basis for measurement. Another important measurement is the transom angle. 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. Spark Plug 25.0nm(18.4 Ft-lb) (2.55 Kgf-m) The greater the number, the more the drive may sway (also called tuck under or negative trim). The Effects of Standard, Lower and Higher Mounting. Anything bigger than that your obviously going to need an extra long shaft. Then, you can pick the right engine. boats.com is part of the Boats Group Network. 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. When you measure the width of the stern, mark the center with a grease pencil. By clicking Accept, you consent to the use of ALL the cookies. Commonly, the transom angle ranges from 0-30 degrees, with the average transom angle set at 14 degrees. The current measurement is the ventilation plate is about 1 1/2" above the true keel line which is about 24" in front of the motor edge. In the case of a dinghy or johnboat, this point may be the top of the transom. Lubrication System Engine Oil Mixed Gasoline. Allowing the propeller to pull water from underneath and push it out behind the boat. 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. Finding the right size is a matter of looking at what youve got and taking out the measuring tape. If you are running a slower boat, the exact location of the ventilation plate is less important. LOYALHEARTDY Outboard Motor 6 HP 2-Stroke Inflatable Fishing Boat It also cuts into speed and fuel efficiency. from the transom. AztH ^zv_ cT,E1K/rAB54| The clamp bracket is designed so that the engine's mounting height on the transom can be adjusted higher than standard. Rebuilt - What You Need to Know, Lower Unit and Sterndrive Break-In Instructions. 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. Industry standards dictate that for short shaft engines the transom height should be 15. Measuring Motor Height - BassBoat Central However, you will need an understanding of how the degrees will alter the boats usability. The transom angle is the vertical incline of the transom and is measured in degrees. This distance is very important to the performance of you boat. As mentioned above, the operation of the propeller relies on the transom height. Some boats are equipped with transom-hung outboards while others have a bracket. primeApr: 12.99, The transom is the flat vertical section at the rear of the boat. bracket forward with a straight edge to where you can then measure up Or it can have an angle degree as high as 30. (function (d) { Check out the full chart of the Mercury outboard model code and its features. The average transom angle is around 14 degrees. The transom in a boat today is a place to hang your outboard motor. These cookies will be stored in your browser only with your consent. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. Simply start with the engine in idle, followed by trimming the motor out by one-half to full trim. Among them will be first-timers or those who have recently purchased their boats. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. 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What the relationship to the pontoons is, I couldn't say. When the boattransom is too low, the motor could end up underwater. straight edge from the center of the pad, but this time you're measuring displayPrimeOffers: true, They keep water out of your prop and increase water pressure in the system. h[0].appendChild(s); Take a long straight edge, (long carpenter's level or long Thats it. Higher mounting decisions should be left to the professionals. 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. It moves an outboard up and down to optimize performance and enable a boat to venture into shallower water than it might otherwise.