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. LOYALHEARTDY Outboard Motor 6 HP 2-Stroke Inflatable Fishing Boat (In the case of the faster 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. These are vertically aligned so the boater can make adjustments. Mounting the outboard motor in accordance with the industry standards is important. Having the cavitation plate a bit lower than the transom is preferable to having it too high. This alone can outweigh the negatives when deciding to adjust the mount upwards. I hope this helps someone out in their search for a new or newer outboard this season. var xmlHttp = new XMLHttpRequest(); The boater must also consider if the boat transomsupport is designed to bear the weight of a higher mount. Place the point of a yardstick at the middle of the top of the boat transom. Mounting the outboard motor in accordance with the industry standards is important. At least if its too long you can raise the motor or "build up" your transom. Add the two measurements and you get 6 1/2". A2: Instead of changing to the short outboard shaft, you can try the Jack Plate first. Boat Transom Heights The Beginners Guide, Buying a boat can be an exciting purchase. Or measure from the main engine prop up to the water line? The average transom angle is around 14 degrees. Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. This is also known as the shaft length. If it measures between 17 and 22, youll want to go with a 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. In lower mounting, the engine is set lower than the recommended standard. Charles Plueddeman is Boats.com's outboard, trailer, and PWC expert. 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. up to the bottom of the motor brackets, (as in #1). var interval = setInterval(function () { 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? Check out the Westshore Marine & Leisure google plus page! 7. Which Navigation Lights Does Your Boat Need? | Sitemap, The Marine Parts Warehouse Outboard Museum, OBR Powerhead / Shortblock Warranty Claim Form, Remanufactured vs. debugMode: false, Keith Allen, a 1979 graduate of Valley City State College, has worked at a variety of jobs including computer operator, medical clinic manager, radio talk show host and potato sorter. Increased RPM and additional horsepower feed the need for speed. Save my name, email, and website in this browser for the next time I comment. bracket forward with a straight edge to where you can then measure up enableMoreInfoLink: true, If you decide to make some custom adjustments we have theexperience and know-howto make it happen. #1: Height ), Al Shields Make sure that you are measuring straight up, at a 90 degree angle to If the propeller fails to ventilate, the motor is mounted to low. The motor length corresponds to the transom height of the boat, measured from the keel to gunwale at the transom. Also, how do you determine the length of an outboard transom? However, youll notice a little increase in drag and a decrease in top-end performance. Extra-long shafts are 25-inches long. a Detwiler manual jackplate. To achieve this, the motor itself has to be attached at the correct height. 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. The collapsing bubbles are loaded with extremely low-pressure water vapor, which causes damage to a variety of surfaces as they collapse. Now that you have a better understanding of boat transom heights its time to take out the ruler and get the perfect measurements. One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. The greater the number, the more the drive may sway (also called tuck under or negative trim). If you went too long it would still work but it may lack in performance. You dont have to be a mathematician to determine the correct boat transomangle. Here we will guide you in how to get the right boat transom height. For slower boats, its less critical to. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. This, however, is not recommended for the beginning boater. (function (d) { var addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = 'info' + '@'; Pretty easy to figure out but like I said its crucial to pairing a motor with a boat. PayTomorrow.mpeInit({ loadScript(ptScript); 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. This could also effect your travelling capabilities on the boat trailer. You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. If you have a question or need additional information. 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. The height of the transom is estimated by using the center line to measure from the bottom of the hull to the top of the transom. How to Measure Outboard Shaft Length: The Only Guide You Need mpeSelector: ".pt-mpe", With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. It is extremely important that the boater understands the significance of the transoms height. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". How Low Should a Motor Set on a Pontoon Boat? (Explained) Before we get started lets see what a boat transom is and what it does. One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. Some may call it a standard length while others may call it a short or a long shaft. Of course, its always best to go with standard practices when choosing thebest boat engine. Smaller 12-14 foot boats can require either a short or long shaft outboard depending on the style of the boat and the brand. Take your time and understand your boat and your entire transom. The transom in a boat today is a place to hang your outboard motor. Whats the best height for my boat motor? But, how do you measure it? A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. 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. In addition, motor totes will not harm the finish of the lower unit. 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. Save my name, email, and website in this browser for the next time I comment. But in many cases, its a little more complicated than that alone. You reply, "Im not sure, I think its a long". disregard the "hooks" at the front of the However, the motor should not be raised more than 5 inches above the standard position. 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. And thats usually the case since the electric outboards are designed with larger and more efficient propeller that needs longer shaft. This measurement was approximately 4". However, the motor should not be raised more than 5 inches above the standard position. Most transom savers can support up to a 150HP motor, which is sufficient for most regular boats. (127 mm). displayMicroOffers: false, manufacturer will recommend the outboard height according to the bracket shape and length. 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. your motor will be higher.) Attention: Remember to measure the outboard shaft length straight up and down instead of measuring along the transom. It is where the outboard is mounted, and some boat owners place the name of the boat. It can also improve the experience of driving a faster boat. It is where the outboard is mounted, and some boat owners place the name of the boat. One of the great things about an outboard motor is how versatile it is. h[0].appendChild(s); There resting on the transom if you had the motor all the way down on the boat 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. These cookies ensure basic functionalities and security features of the website, anonymously. MarinePartsMan.com also says that V6 bass-boat engines have a 20-inch shaft. Some fishing boats can handle the motor being underwater. Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. Outboard Motor Shaft Length - LeeRoy's Ramblings Other factors to consider when determining the mounting height of an outboard are related to performance. } These are vertically aligned so the boater can make adjustments. Boat Transom Heights - The Beginner's Guide | My Westshore The Effects of Standard, Lower and Higher Mounting. Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. #2. Each one has a totally different effect on the boats performance. Simply start with the engine in idle, followed bytrimming the motor out by one-half to full trim. (Putting a A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. You can find your Mercury outboard model code on an ID plate or sticker. x\[D~OUCO6[j](l%ay <8cylY{.L2s#]~U6A|Wj]-oo|mubqY6wbY_|!>Z8(RB:RHeTzOGO_=~t\ })(); How to Measure Shaft Length on Outboard Motor? - TrollinMotorsGuide Long Shaft vs. Short Shaft Outboard (What Are the Differences?) This provides seaworthiness and offers maximum protection from large seas. Will Charpentier is a writer who specializes in boating and maritime subjects. var h = d.getElementsByTagName("head"), The pros and cons of properly . As summer approaches there will be more boaters taking to the water. (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. I mean, who wants to purchase something as expensive as an outboard to only realize you bought the wrong one. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. The height of the boat transom dictates the size of the outboard motor. This measurement is primarily designed for single motor propulsion. What is a Transom Saver And Do I Need One? - Boat Safe The transom is the rear wall of the boat where the outboard engine is mounted in the middle. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. Its important to note that manufacturers call their models different things. Later in the article is an image that shows you exactly where to measure. 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. relation to pad I mean it is better to be safe than sorry, am I right? It varies between different motors and boats. Engine height with stepped hull at transom - before I screw things up Mounting the motor lower on the boat transomcan createexcessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. maxMicroAmount: 0.0, So how to determine the outboard shaft length? The height of the boat transom dictates the size of the outboard motor. The boat transom height is measured from the lowest point on the keel along the center line to the spot where the outboard motor's mounting holes bracket rests. Any questions? Using your existing control box and gauges will save you quite a bit of money in the end. Outboard Motor Shaft Length: How do I measure? Read the measurement on the transoms bottom. Measure the area of the transom directly where the engine will be mounted. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. If so, send me an Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. %PDF-1.7 The form of a boats transom varies depending on the manufacturer and model. Step 4. You must be still in the blue about that matter. https:/. Always weigh the risks of making adjustments. What types of boat need an extra long shaft? brackets. This number will likely be shorter than that for a single-engine installation since you do not necessarily measure to the point of the keel. Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. want to measure from the transom to the flat part of this bracket, function mpeInit() { If possible for your peace of mind and not let down that magnificent purchase opportunity, place that 08 kicker at back transom and test for yourself. His works have appeared in regional newspapers in North Dakota and in "North Dakota Horizons" and "Cowboys and Indians" magazines. When fighting waves from the stern, a 20-inch transom is considerably safer. You can order an outboard in lengths ranging from 15 inches to 30 inches, depending on its power output and possible uses. If you go too short your more than likely going to cavitate and loose power. Tilt your motor until the bullet of the gearcase is The prop will be in cleaner, harder water as it advances farther aft, making it more efficient. out the confusion. When the boattransom is too low, the motor could end up underwater. As summer approaches there will be more boaters taking to the water. Thats it. Problems with getting the ventilation plate too low include slower hole-shot and lower top-end speeds. Basically, there are three main ways to measure motor This cookie is set by GDPR Cookie Consent plugin. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Then open up the clamp bucket. The transom is the flat vertical section at the rear of the boat. When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. An inch or two probably wont make a big difference, but any more than that will lead to trouble. since 1986. He is also a certified marine technician and the author of a popular text on writing local history. Setting Height of Outboard Motor - YouTube Determining Your Boat Transom Angle The transom angle - commonly measured in degrees - is the transom's vertical inclination. Or it can have an angle degree as high as 30. How can you figure out what your transom angle is? AztH ^zv_ cT,E1K/rAB54| This is the dimension you'll need when selecting a width for your outboard motor's mounting bracket. Displacement hulled vessels like sailboats and workboats can benefit from a little more space between the hull and cavitation plate, but not much. Transom Outboard Engine Position - YouTube Whether you already own a boat or looking for your first watercraft we are here to service your needs. Cavitation plates are used on the bottom components of boats to help them operate better. Since the ventilation plate & foil are burried under water it is obviously too low. If it measures between 17 and 22, you'll want to go with a long shaft motor. minAmount: 300.0, Among them will be first-timers or those who have recently purchased their boats. This is simply a measurement taken from the top of the transom (top of actually have the propshaft above the pad.). 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. With some boats I have a pretty good idea as to what length motor should be hung on them. gtag('js', new Date()); If the height of the boat transom is off it can cause major issues. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Before we get started lets see what a boat transom is and what it does. the aluminum plate on top of the transom), to the bottom of the motor When you measure the width of the stern, mark the center with a grease pencil. Basically, there are three main ways to measure motor height (that I'm aware of); probably the most common is: # 1: Height of the motor off the transom This is simply a measurement taken from the top of the transom (top of the aluminum plate on top of the transom), to the bottom of the motor "brackets". will be to the flat part; if you measure to the bottom of the brackets % The transom is the "back wall" of your boat, the most rearward part of your hull. The point where these measurements intersect is your centerline. What is the Virtual Sundance Film Festival? height (that I'm aware of); probably the most common is: In the photo above, we've measured from the motor bracket to the top of This cookie is set by GDPR Cookie Consent plugin. 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.
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