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Like Westshore Marine & Leisure on Facebook! What is Transom Height? 5/rC,aQhsK@Q. What are Apple Podcasts Subscriptions and Channels? If you go too short your more than likely going to cavitate and loose power. logoColor: "original", Tilt your motor until the bullet of the gearcase is The transom angle is the vertical incline of the transom and is measured in degrees. Trimming in, trimming down, and trimming out are all terms that a beginning boater should learn. enableMoreInfoLink: true, Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. endobj Industry standards dictate that for short shaft engines the transom height should be 15. As mentioned above, the operation of the propeller relies on the transom height. }, 100); Gear case sits just below or at the hull depth due to the deep v. parallel with the straight edge. 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. A: The short answer is Yes. Lastly, knowing the year of your motor and what style of controls you have (side mount, concealed side mount, or binnacle) is also a plus because it will tell the dealer if your current controls are compatible with the motor you are purchasing. 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). When it gets to the short side (14), When the inner corner of the square comes into touch with the transom, measure the distance between the inside corner of the square and the boat bottom (see drawing below). <> Take your time and understand your boat and your entire transom. Displacement hulled vessels like sailboats and workboats can benefit from a little more space between the hull and cavitation plate, but not much. This email address is being protected from spambots. The pros and cons of properly . Offshore vessels are often equipped with a large mounting bracket so that the transom can be left at full height. If the height of the boat transom is off it can cause major issues. The average transom angle is around 14 degrees. Triton. The vertical distance between the interior of the clamp and the cavitation plate is the shaft length specified by the outboard manufacturer. Youll also want to pay attention when youre in shallow water because your prop will be lower than normal. We also use third-party cookies that help us analyze and understand how you use this website. I live for the weekends when I can go out on the water and escape the stress of life on land. A1: Broadly speaking, the outboard motor shaft length for pontoon boat, bass boat, or other larger boats should be long shaft. 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. Add the two measurements and you get 6 1/2". The cookie is used to store the user consent for the cookies in the category "Performance". displayPrimeOffers: true, clearInterval(interval); This will ensure the best performance. 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. 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. %PDF-1.7 h[0].appendChild(s); Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. 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. Picking the right shaft length for your outboard is an essential step in getting the best performance from your boat. 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. var prefix = 'ma' + 'il' + 'to'; var h = d.getElementsByTagName("head"), There are a series of four to six holes at the top of the bracket, and the lower bolts actually fit into slots. MarinePartsMan.com also says that V6 bass-boat engines have a 20-inch shaft. In the case of a larger offshore boat, it may be to the top of a cutout on the . (We wont go into name-calling here, but the actual term for the cavitation plate is an anti-ventilation plate.) If you said you have a pontoon or a larger style boat such as a bass boat or speed boat, I would be pretty confident in saying it needs a long shaft. Later in the article is an image that shows you exactly where to measure. The greater the number, the more the drive may sway (also called tuck under or negative trim). August 9/08). (In the case of the faster Since the length of the shaft of your outboard is associated with the size boat, smaller engines will generally have shorter shafts. To achieve 35 mph with a 6 hp engine, the total weight is 135 lbs (boat motor fuel passengers). Follow Westshore Marine & Leisure on Wordpress! The boat transom can be flat with zero degree angles. 12 Small Fishing Boat Accessories to Buy Today. will be to the flat part; if you measure to the bottom of the brackets Now that you have a better understanding of boat transom heights its time to take out the ruler and get the perfect measurements. This is measured by the propeller shaft being parallel to the vessels bottom. It was a 23-foot Crestliner Grand Cayman pontoon boat. What the relationship to the pontoons is, I couldn't say. var path = 'hr' + 'ef' + '='; What types of boat need an extra long shaft? This will keep the prop in the water when the boat pitches in waves, or hobby-horses. All things considered, sticking with the industry standard is best for the beginner. He is a There are instances where a lower mount may be okay. It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. The cookie is used to store the user consent for the cookies in the category "Analytics". Over time, Boating Hub has grown into a resource for boating enthusiasts around world. Outboards designed for saltwater applications usually have longer shafts. height (that I'm aware of); probably the most common is: publicId: "32bf3437d1346295e03ebcf545f9c839", The pressure behind your hand dropped as you slid your hand back and forth through the water. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. 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. There are 2 steps to help get a relatively accurate figure. (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. 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. 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. When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. Where Onboard a Boat is the Transom Located and More About Transom Heights A propeller operates based on the height of the transom. steel ruler, etc. While this is the case there is certain saltwater motors that are extra extra long at 30. | Sitemap, The Marine Parts Warehouse Outboard Museum, OBR Powerhead / Shortblock Warranty Claim Form, Remanufactured vs. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. The clamp bracket on the latest Mercury Four-Stoke-model outboards has five mounting bolt holes spaced .75 inches apart. 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. You may wonder how deep your prop should be in the water. 1 0 obj When the boattransom is too low, the motor could end up underwater. You can use a longer shaft than recommended and your boat will work fine. measuring; you may have to "extend" the flat part of the This measurement is primarily designed for single motor propulsion. In the past, though, it housed the officers and captain of 17th, 18th and 19th century sailing ships. This cookie is set by GDPR Cookie Consent plugin. Boat transomangles play a pivotal role in the flexibility of the boats trimming abilities. s = d.createElement("script"); In addition, motor totes will not harm the finish of the lower unit. To do so, measure from the stern (back) of the boat to the midpoint of the hull on both sides. Check out the full chart of the Mercury outboard model code and its features. On this type of boat, if you are in doubt, default to the longer-shafted outboard. |. They operate as a planing surface, allowing your boat to climb to the top more quickly. This is also known as the shaft length. Learn More About Your Boats Systems By Joining The Born Again Boating Academy! The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. minAmount: 300.0, However, there may be times when a boater strays away from these recommendations. If you have already measured you transom tip to bottom to be 20", then if you place aux sdieways to central engine your available transom height will be probably 1"-1.5" " higher and work perfecty. 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. Smaller 12-14 foot boats can require either a short or long shaft outboard depending on the style of the boat and the brand. Charles Plueddeman is Boats.com's outboard, trailer, and PWC expert. However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. Spark Plug 25.0nm(18.4 Ft-lb) (2.55 Kgf-m) If you decide to make adjustments, please consult a marine engine dealer about the boatdesign. 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. Propshaft in This could also affect your travelling capabilities on the boat trailer. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. #3. The cookie is used to store the user consent for the cookies in the category "Other. For example, you can have the Mercury outboard shaft length by model code. 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. Owners of bass boats, RIBs, or offshore fishing boats need to get this right. These cookies will be stored in your browser only with your consent. Which Navigation Lights Does Your Boat Need? A reversetransom that sits too high can impact the propellers of the motor and motor bracket. Always weigh the risks of making adjustments. I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. mpeSelector: ".pt-mpe", Other boats that need extra long shafts are: Read my other articles on outboard motors. Take a long straight edge, (long carpenter's level or long These cookies ensure basic functionalities and security features of the website, anonymously. Then adjust the motor in a higher hole with a flat head screwdriver. Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. Outboard shaft length plays a crucial role in the performance of your boat. My family and I used it to fish, ski (yes, you can ski behind a pontoon boat), and cruise the lakes near our home. Mounting the outboard a little bit lower than the standard point could avoid the possible ventilation and slip on acceleration. Recommended Engine Oil 2-Stroke Outboard Motor Oil. Your email address will not be published. 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. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. center of the propshaft. This is handy if youre shopping for second-hand outboards or looking to sell the one that came with your boat. of the motor off the transom Most of the time, adding a hydrofoil to an outboard improves performance. This alone can outweigh the negatives when deciding to adjust the mount upwards. motor brackets 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}'); Take your time and understand your boat and your entire transom. 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. 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. Among them will be first-timers or those who have recently purchased their boats. You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. This restriction includes most fishing boats and longer sailboats. If the propeller fails to ventilate, the motor is mounted to low. Check out some hot FAQs to help you get the proper outboard shaft lengths. Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. Although the longer outboard shaft length can lead to lower speed and more drag, the boat can push a heavier load. As a result, the issue is whether my boat need a short shaft or long shaft motor. actually have the propshaft above the pad.). Measure from the top of the transom to the bottom of the hull. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. 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. This is probably the worst case scenario out of the two. You can find your Mercury outboard model code on an ID plate or sticker. 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 could also effect your travelling capabilities on the boat trailer. Eq*^?6R83e+j}UY.(M7k]~4g)g ~wmS{ O7t/o(W|X? Or it can have an angle degree as high as 30. xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); If you decide to make adjustments, please consult a marine engine dealer about the boat design. Other factors to consider when determining the mounting height of an outboard are related to performance. 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. This, however, is not recommended for the beginning boater. Attention: Remember to measure the outboard shaft length straight up and down instead of measuring along the transom. This is measured by the propeller shaft being parallel to the vessels bottom. Step 3: Add another 10 cm (4'') to the previous calculation for the final ideal shaft length. Higher mounting decisions should be left to the professionals. This, however, is not recommended for the beginning boater. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Theyre also useful if the back of your boat has a non-standard measurement. Also, how do you determine the length of an outboard transom? The transom is the back of the boat where the motor is hung. AztH ^zv_ cT,E1K/rAB54| 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. It also decreases the boats lift and increases the time it takes for the boat to reach plane. A yardstick will help you determine if your outboard engine is at the right height. Having the cavitation plate too low will cause excess drag and reduced performance at high speeds. The transom is the rear wall of the boat where the outboard engine is mounted in the middle. In lower mounting, the engine is set lower than the recommended standard. 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. How to Measure Transom Height For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. })(); Always weigh the risks of making adjustments. Beginning boaters should be aware of the boats measurements. Having the cavitation plate a bit lower than the transom is preferable to having it too high. All you need to do is measure how much to rise. 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. To measure the transom height, measure from the center on for transom (rear of the boat). 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. As a yacht designer and boater, I prefer longer shafts. It is where the outboard is mounted, and some boat owners place the name of the boat. Any questions? up to the bottom of the motor brackets, (as in #1). What is the Virtual Sundance Film Festival? Whether you already own a boat or looking for your first watercraft we are here to service your needs. (3) Move horizontally across the chart until you hit the graph curve. Set the end of the tape on the outside edge of the taffrail at the center and measure inward to the inside edge of the taffrail. a Detwiler manual jackplate. The cookies is used to store the user consent for the cookies in the category "Necessary". Tightening Torque for Engine. Finding the right size is a matter of looking at what youve got and taking out the measuring tape. Place the bracket on the transom to the left of the main outboard or rudder. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. So how to measure outboard shaft length? 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. displayMicroOffers: false, The faster your boat, the more critical it is to get the sizing just right. Safely but briskly accelerate. 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. bracket forward with a straight edge to where you can then measure up } Boat Transom Heights The Beginners Guide, Buying a boat can be an exciting purchase. The brackets can add 1 inch to the overall mounting height of the outboard. This measurement would be the inches of Thats it. How do you measure a transom on an outboard motor? There are also specialty motor shaft lengths. 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. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. The form of a boats transom varies depending on the manufacturer and model. boats.com, 1221 Brickell Avenue, 23rd Floor, Miami, FL 33131, USA. 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. 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. Follow Westshore Marine & Leisure on Twitter! The prop will be in cleaner, harder water as it advances farther aft, making it more efficient. It is where the outboard is mounted, and some boat owners place the name of the boat. Measure from there down to the top of the cavitation plate, also known as the anti-ventilation plate. 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. Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. The height of the boat transom dictates the size of the outboard motor. Gear Oil Quantity 195ml(6.6 Fl.oz.) You also have the option to opt-out of these cookies. It varies between different motors and boats. var interval = setInterval(function () { This measurement was approximately 4". It moves an outboard up and down to optimize performance and enable a boat to venture into shallower water than it might otherwise. Youll need a short shaft outboard if its 15 or less than an inch shorter. It is extremely important that the boater understands the significance of the transoms height. Simply start with the engine in idle, followed by trimming the motor out by one-half to full trim. 4 0 obj Each one has a totally different effect on the boats performance. Typical motor lengths include the following. Using your existing control box and gauges will save you quite a bit of money in the end. 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. However, youll notice a little increase in drag and a decrease in top-end performance. Or it can have an angle degree as high as 30. 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. To achieve this, the motor itself has to be attached at the correct height. Measure from the top of the straight edge to the center of the front Analytical cookies are used to understand how visitors interact with the website. function loadScript(script) { 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. If it measures between 17 and 22, youll want to go with a long shaft motor. If you said something smaller than that, thats where it can get tricky. The first order of business is to measure your boat for the ideal fit. 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. Place the clubs bottom on the ground as though it were going to be used to strike a golf ball. the propshaft below or above the pad. Most of the standard engined boats it takes shafts that are 15-30inches long. You The center is the point where your outboard motor is (ideally) located. I mean it is better to be safe than sorry, am I right? Shaft lengths are available in increments of 5. Amazon has plate extensions to allow adjustments without buying a new motor: T-H Marine Jack Plate Extension. Copyright 1999-2023 Boats Group. In the case of a dinghy or johnboat, this point may be the top of the transom. It also cuts into speed and fuel efficiency. Some boats are equipped with transom-hung outboards while others have a bracket. You need JavaScript enabled to view it. The Effects of Standard, Lower and Higher Mounting. Other boats that need long shafts are. Outboard motors can be fitted to a variety of boats, so manufacturers have standardized their engines to go on virtually anything. Well, raising the outboard motor can be an easy task for you. Cutting the transom down is the only legal method to utilize a short shaft engine on a tall transom. Then test the boat and adjust the height, if necessary . All rights reserved. straight edge from the center of the pad, but this time you're measuring Ill also explain the difference between short and long shafts and how they vary by type of boat. For most boaters this is a no brainer, but for the novice or inexperienced boater it may be a tougher question. In step 3, add another 10 cm (4") to the previous calculation in order to develop the ideal shaft length. So how to determine the outboard shaft length? Another important measurement is the transom angle. 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. 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. Check the literature about your model boat online, and you may be surprised to find that the number is published for you. Plus, a low transom cut is an invitation for the water to flood the boat. Wherever the outboard clamping bracket is, use this as the basis for measurement. If you have a question or need additional information,contact ustoday. gtag('js', new Date()); 3 0 obj What Kind of Fuel Does Your Marine Engine Need? I would ask you to go back and measure the transom of your boat. Measuring the shaft length can be done in various ways, but the most common way is by using a tape measure. It does not store any personal data. 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. Some outboards have a serial number that tells you which shaft length to go for. 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. Engine Oil Mixing Ratio Fuel 50: Engine Oil 1. How high exactly do you have to raise the transom?-. With this in mind, how can I determine if my outboard has a short or long shaft? % Small motors built for sailboats might come in a unique configuration with an extremely long shaft since these are mounted higher off the water. 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. 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. Since the ventilation plate & foil are burried under water it is obviously too low. Check out the Westshore Marine & Leisure Youtube page! Mounting the outboard motor in accordance with the industry standards is important. s.setAttribute("href", "https://cdn.paytomorrow.com/css/pt-mpe.min.css"); 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. This cookie is set by GDPR Cookie Consent plugin. The transom angle is the vertical incline of the transom and is measured in degrees.