One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. 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. This could also effect your travelling capabilities on the boat trailer. to where the brackets were actually resting on the transom. Rest the yard stick or another suitable straight edge along the keel on the bottom of the boat so that it makes a straight line aft to the outboard. <> 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. 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. 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. mpeSelector: ".pt-mpe", Knowing how this can affect the overall operation of the boat is a factor to be considered. Place the bracket on the transom to the left of the main outboard or rudder. Of course, its always best to go with standard practices when choosing thebest boat engine. This cookie is set by GDPR Cookie Consent plugin. If youre looking for a bracket that can handle motors of up to 10/15 horsepower, go no further. Gear Oil Quantity 195ml(6.6 Fl.oz.) The brackets can add 1 inch to the overall mounting height of the outboard. It is very versatile as it generally . This cookie is set by GDPR Cookie Consent plugin. When you measure the width of the stern, mark the center with a grease pencil. These are vertically aligned so the boater can make adjustments. Beginning boaters should be aware of the boats measurements. The cavitation plate is the horizontal surface of the lower unit immediately above the propeller. var h = d.getElementsByTagName("head"), Boat transomangles play a pivotal role in the flexibility of the boats trimming abilities. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. Height Measurement: Recommended Shaft Length: 14" - 17.25" 15" Shaft (Short) 17.25" - 19.5" Varies by application 19.5" - 22.5" The faster your boat, the more critical it is to get the sizing just right. 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. 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. Here we will guide you in how to get the right boat transom height. It is where the outboard is mounted, and some boat owners place the name of the boat. On the downside, a higher mount can interfere with the boaters steering capabilities. bassboat can be a bit confusing at times; hopefully this will help sort Place the rulers end on the ground behind the club and let the club to rest on top of it. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. The clamp bracket on the latest Mercury Four-Stoke-model outboards has five mounting bolt holes spaced .75 inches apart. 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. 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 transom is the boats flat vertical part at the back. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. With this in mind, how can I determine if my outboard has a short or long shaft? He is a In the case of a larger offshore boat, it may be to the top of a cutout on the . In the photo above, we've measured from the motor bracket to the top of As a result, the issue is whether my boat need a short shaft or long shaft motor. 12 Small Fishing Boat Accessories to Buy Today. All things considered, sticking with the industry standard is best for the beginner. 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. How To Mount An Outboard Motor Properly - Start to Finish! If the height of the boat transom is off it can cause major issues. Attention: Remember to measure the outboard shaft length straight up and down instead of measuring along the transom. <> When trimming your motor, they provide you a greater bow response. #1: Height The prop will be in cleaner, harder water as it advances farther aft, making it more efficient. The rearmost structural member of your boat, it not only distributes the stress of the hull generated by the bow's impact as it cleaves the water, it's the place you hang your outboard motor. Here we will guide you in how to get the right boat transom height. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Motor height on pontoon? | Boating Forum - iboats Boating Forums Ill also explain the difference between short and long shafts and how they vary by type of boat. Your at your local outboard dealer shopping for a new motor and the salesman hits you with the question, "short or long shaft?". 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. Although the longer outboard shaft length can lead to lower speed and more drag, the boat can push a heavier load. Check out some hot FAQs to help you get the proper outboard shaft lengths. This email address is being protected from spambots. There is a simple test to see if your outboard motor is set at the best height. Check out the full chart of the Mercury outboard model code and its features. Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. How To Measure Outboard Motor Shaft Length [Long v Short] - Boating Hub However, there may be times when a boater strays away from these recommendations. MPW eBay Store - Thousands of New OEM Old Stock Parts! To do so, take a measurement from the very top to the very bottom of the transom in the precise center. The average transom angle is around 14 degrees. This measurement is primarily designed for single motor propulsion. If your boat is newer and the manufacturer is still in business, you might also want to try to give them a call. jackplate to a point level with the top of the transom. Spark Plug 25.0nm(18.4 Ft-lb) (2.55 Kgf-m) The same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. 7. How high exactly do you have to raise the transom?- - Outboard Jets function loadScript(script) { If you decide to make some custom adjustments we have theexperience and know-howto make it happen. (function () { Should I take the raft onto the water and measure the exact distance from the top of the transom to the water line? Higher mounting decisions should be left to the professionals. 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. To achieve 35 mph with a 6 hp engine, the total weight is 135 lbs (boat motor fuel passengers). xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); How to Measure a Boat Transom - Gone Outdoors Mounting the outboard a little bit lower than the standard point could avoid the possible ventilation and slip on acceleration. This allows the engine to idle without the flow of the exhaust being restricted. Doing so, will put the propeller right below the boat. How high exactly do you have to raise the transom?-. You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. publicId: "32bf3437d1346295e03ebcf545f9c839", 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. s.setAttribute("rel", "stylesheet"); Long shafts are 20-inches long. In lower mounting, the engine is set lower than the recommended standard. Finding the right size is a matter of looking at what youve got and taking out the measuring tape. Typical motor lengths include the following. The lowest point will likely be directly under your drain plug if youve got one. Rebuilt - What You Need to Know, Lower Unit and Sterndrive Break-In Instructions. Before we start measuring the outboard shaft length, lets get it clear about whats referring to when we talk about the outboard shaft length. You dont have to be a mathematician to determine the correct boat transomangle. Over time, Boating Hub has grown into a resource for boating enthusiasts around world. I mean it is better to be safe than sorry, am I right? from the transom. Some boats are equipped with transom-hung outboards while others have a bracket. It is unsafe to have the engine block too close to the water on a low transom. 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). 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 transom is the rear wall of the boat where the outboard engine is mounted in the middle. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. former editor at Boating Magazine and contributor to many national publications This website uses cookies to improve your experience while you navigate through the website. As you can see, the measurement is about 2 1/2". 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. Before we get started lets see what a boat transom is and what it does. LOYALHEARTDY Outboard Motor 6 HP 2-Stroke Inflatable Fishing Boat Most of the time, adding a hydrofoil to an outboard improves performance. See diagram below. Youll also want to pay attention when youre in shallow water because your prop will be lower than normal. Check out the Westshore Marine & Leisure google plus page! brackets. Owners of bass boats, RIBs, or offshore fishing boats need to get this right. want to measure from the transom to the flat part of this bracket, So you should just measure the height of the boat's transom from the center down to the lowest point of the hull, and compare transom height with the outboard shaft length numbers. disregard the "hooks" at the front of the 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. 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. These are vertically aligned so the boater can make adjustments. bracket. Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. There are 2 steps to help get a relatively accurate figure. Each one has a totally different effect on the boats performance. 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. For boats equipped with a bracket, calculate the same measurement but based on the bracket and not the transom. In the second photo, we've measure down from the top of the Detwiler Later in the article is an image that shows you exactly where to measure. document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML = ''; (127 mm). Commonly, the transom angle ranges from 0-30 degrees, with the average transom angle set at 14 degrees. This will keep the prop in the water when the boat pitches in waves, or hobby-horses. The boater must also consider if the boat transom support is designed to bear the weight of a higher mount. What Is a Transom? Where Onboard a Boat is It Located? If it measures 15" or with in a inch of that you will need a short shaft outboard. Basically, there are three main ways to measure motor Small motors built for sailboats might come in a unique configuration with an extremely long shaft since these are mounted higher off the water. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. <>/Metadata 127 0 R/ViewerPreferences 128 0 R>> Smaller 12-14 foot boats can require either a short or long shaft outboard depending on the style of the boat and the brand. Another important measurement is the transom angle. Cavitation plates are used on the bottom components of boats to help them operate better. This distance is very important to the performance of you boat. The engine must be linked to the transom at the proper height for a propeller to best meet specific boating demands. Picking the right shaft length is mostly a factor of the transom height or the back of the boat. (3) Move horizontally across the chart until you hit the graph curve. It also cuts into speed and fuel efficiency. 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. To do so, you will want to measure at the exact center of the transom from the very top to the very 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 Find Your Shaft Length | ePropulsion However, youll notice a little increase in drag and a decrease in top-end performance. There are instances where a lower mount may be okay. 3 0 obj Measuring the shaft length can be done in various ways, but the most common way is by using a tape measure. } High powered boats usually only come in long and extra-long variants. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. Simply start with the engine in idle, followed by trimming the motor out by one-half to full trim. The mounting height of an outboard motor can impact the speed and handling characteristics of the boat. Actual shaft length is 21.5" on those. 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. clearInterval(interval); You may wonder how deep your prop should be in the water. 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. Thats a fairly simple list of symptoms, but if your motor is too low, youll probably notice at least one of them. The correct shaft length for your boat depends on a few factors. How to Measure Shaft Length on Outboard Motor? - TrollinMotorsGuide height (that I'm aware of); probably the most common is: straight edge from the center of the pad, but this time you're measuring Measure the area of the transom directly where the engine will be mounted. It also includes attaching the right engine. Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. ), Al Shields It can also improve the experience of driving a faster boat. You 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. The transom angle is the vertical incline of the transom and is measured in degrees. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. Again, make sure that you are measuring to the flat part of the brackets; Boats with more engine power and weight require longer shaft outboards for better balance. 7. addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; As with anything, there are exceptions to the rule. Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. Transom Outboard Engine Position - YouTube maxMicroAmount: 0.0, Some may call it a standard length while others may call it a short or a long shaft. | Sitemap, The Marine Parts Warehouse Outboard Museum, OBR Powerhead / Shortblock Warranty Claim Form, Remanufactured vs. 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. Ten years ago I bought my first boat. To break it down a bit more for you: Short shafts are 15-inches long. MarinePartsMan.com also says that V6 bass-boat engines have a 20-inch shaft. (Any measurement given as "off the transom" However, the motor should not be raised more than 5 inches above the standard position. Measure from there down to the top of the cavitation plate, also known as the anti-ventilation plate. Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. The shaft length for outboard motors has nothing to do with the water line. How Transom Height Is Measured 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). There are instances where a lower mount may be okay. Step 2: After you get the transom height, add the radius of the propeller (check the user manual, and then technical drawing for the number) to calculate the minimum shaft length needed to make it work. h[0].appendChild(s); 2019s List of the Best Recreational Pontoon Boats for Sale. 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. AztH ^zv_ cT,E1K/rAB54| 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. your motor will be higher.) The cookies is used to store the user consent for the cookies in the category "Necessary". These cookies track visitors across websites and collect information to provide customized ads. boats.com is part of the Boats Group Network. Problems with getting the ventilation plate too low include slower hole-shot and lower top-end speeds. How to Measure Transom Height For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. h[0].appendChild(s); In the past, though, it housed the officers and captain of 17th, 18th and 19th century sailing ships. s.setAttribute("type", "text/javascript"); It is extremely important that the boater understands the significance of the transoms height. Outboard Motor Shaft Length For Pontoon Boat - Survival Tech Shop With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. This is measured by the propeller shaft being parallel to the vessels bottom. Knowing how this can affect the overall operation of the boat is a factor to be considered. In lower mounting, the engine is set lower than the recommended standard. Here we look at the effects of standard, lower and higher mounting. Actually there is no designated letter for short shaft. How-To: Pick A Great Portable Outboard Motor (2023 Guide) Knowing the width, height and depth of your transom allows you to make several important decisions when selecting or purchasing a new outboard. maxAmount: 6500.0, Then adjust the motor in a higher hole with a flat head screwdriver. manufacturer will recommend the outboard height according to the bracket shape and length. Since the ventilation plate & foil are burried under water it is obviously too low. It is extremely important that the boater understands the significance of the transom's height. Follow Westshore Marine & Leisure on Wordpress! x\[D~OUCO6[j](l%ay <8cylY{.L2s#]~U6A|Wj]-oo|mubqY6wbY_|!>Z8(RB:RHeTzOGO_=~t\ Save my name, email, and website in this browser for the next time I comment. An outboard motor can drive just about any sort of boat with proper mounting. A1: Broadly speaking, the outboard motor shaft length for pontoon boat, bass boat, or other larger boats should be long shaft. Engine Oil Type Genuine or Recommended 2str Engine Oil. 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.

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