trimming the motor out by one-half to full trim. x\[D~OUCO6[j](l%ay <8cylY{.L2s#]~U6A|Wj]-oo|mubqY6wbY_|!>Z8(RB:RHeTzOGO_=~t\ Step 2 requires the propeller's radius (check the user manual and then the technical drawing). Here we will guide you in how to get the right boat transom height. 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. As with anything, there are exceptions to the rule. Height Measurement: Recommended Shaft Length: 14" - 17.25" 15" Shaft (Short) 17.25" - 19.5" Varies by application 19.5" - 22.5" 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. height (that I'm aware of); probably the most common is: This is also known as the shaft length. function loadScript(script) { The performance of these boats depends on quite a lot of factors, but getting the outboard length just right is an essential first step. Basically, there are three main ways to measure motor 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. not sure that it's still used. Boat Transom Heights The Beginners Guide, Buying a boat can be an exciting purchase. The motor is what powers the boat so the two go hand-in-hand. This cookie is set by GDPR Cookie Consent plugin. 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. If it measures between 17 and 22, you'll want to go with a long shaft motor. brackets. Each one has a totally different effect on the boats performance. Having the cavitation plate a bit lower than the transom is preferable to having it too high. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. h[0].appendChild(s); The outboard comes with mounting holes and brackets. Recommended Engine Oil 2-Stroke Outboard Motor Oil. Industry standards dictate that for short shaft engines the transom height should be 15. You can order an outboard in lengths ranging from 15 inches to 30 inches, depending on its power output and possible uses. With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. This, however, is not recommended for the beginning boater. As a yacht designer and boater, I prefer longer shafts. Some boats are equipped with transom-hung outboards while others have a bracket. The first order of business is to measure your boat for the ideal fit. With this in mind, how can I determine if my outboard has a short or long shaft? Displacement hulled vessels like sailboats and workboats can benefit from a little more space between the hull and cavitation plate, but not much. These two measurements will give you the length of the shaft you need. var interval = setInterval(function () { 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 collapsing bubbles are loaded with extremely low-pressure water vapor, which causes damage to a variety of surfaces as they collapse. Knowing how this can affect the overall operation of the boat is a factor to be considered. It is very versatile as it generally . Again, make sure that you are measuring to the flat part of the brackets; Knowing the width, height and depth of your transom allows you to make several important decisions when selecting or purchasing a new outboard. (In the case of the faster How high exactly do you have to raise the transom?-. Also, how do you determine the length of an outboard transom? 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. The cookie is used to store the user consent for the cookies in the category "Analytics". Say the 20 shaft is a long shaft length for gas engines, but it is a short shaft length for electric outboard motors. There is a simple test to see if your outboard motor is set at the best height. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Most of the time, adding a hydrofoil to an outboard improves performance. The transom is the back of the boat where the motor is hung. If your boat is newer and the manufacturer is still in business, you might also want to try to give them a call. This will ensure the best performance. It moves an outboard up and down to optimize performance and enable a boat to venture into shallower water than it might otherwise. How can you figure out what your transom angle is? 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. Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. What types of boat need an extra long shaft? You can use a longer shaft than recommended and your boat will work fine. <>/Metadata 127 0 R/ViewerPreferences 128 0 R>> Take your time and understand your boat and your entire transom. You must be still in the blue about that matter. Many boat transoms are modified to use a different length of outboard by using a bracket. s = d.createElement("link"); Two years ago, I bought a Boston Whaler to fish off the coast. since 1986. Whats the best height for my boat motor? It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. Boats with more engine power and weight require longer shaft outboards for better balance. Setting Height of Outboard Motor - YouTube 0:00 / 0:46 Setting Height of Outboard Motor nates90 71 subscribers Subscribe 83 Share 63K views 7 years ago #boatservice #outboardmotor. It is where the outboard is mounted, and some boat owners place the name of the boat. These cookies track visitors across websites and collect information to provide customized ads. This email address is being protected from spambots. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. primeApr: 12.99, Actually there is no designated letter for short shaft. 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. If your outboard motor height. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. Amazon has plate extensions to allow adjustments without buying a new motor: T-H Marine Jack Plate Extension. The pros and cons of properly . A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Another important measurement is the transom angle. Measure the area of the transom directly where the engine will be mounted. window.dataLayer = window.dataLayer || []; It was a 23-foot Crestliner Grand Cayman pontoon boat. *The Factors indicates the adjustment affected by on your boat type, the outboard working environment, and the transom distance as discussed above. When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. Depending on the manufacturer, size names might change. 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. In the case of a larger offshore boat, it may be to the top of a cutout on the . 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. 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. manufacturer will recommend the outboard height according to the bracket shape and length. The same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. Picking the right shaft length for your outboard is an essential step in getting the best performance from your boat. If youre going the other way around and trying to figure out how long the shaft on your outboard is, measuring it is equally easy. var path = 'hr' + 'ef' + '='; Other boats that need long shafts are. However, your boat will have slightly more drag which will reduce your maximum speed. Expectedly, when the transom angle is zero, it means it is flat. A reverse transom that sits too high can impact the propellers of the motor and motor bracket. Lubrication System Engine Oil Mixed Gasoline. 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. However, there may be times when a boater strays away from these recommendations. All rights reserved. All rights reserved. You reply, "Im not sure, I think its a long". The propellers will also have trouble reaching the water. A: Any boat that has a 21 to 27 inch aft transom will need an extra long shaft outboard. Follow Westshore Marine & Leisure on Twitter! The cavitation plate is the horizontal surface of the lower unit immediately above the propeller. Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. This will be the The amount of degrees the transom leans back from vertical is known as the transom angle. actually have the propshaft above the pad.). The transom is the "back wall" of your boat, the most rearward part of your hull. In the photo above, we've measured from the motor bracket to the top of 2019s List of the Best Recreational Pontoon Boats for Sale. % Increased RPM and additional horsepower feed the need for speed. Place the rulers end on the ground behind the club and let the club to rest on top of it. Finding the right size is a matter of looking at what youve got and taking out the measuring tape. |. A reversetransom that sits too high can impact the propellers of the motor and motor bracket. It also cuts into speed and fuel efficiency. displayPrimeOffers: true, 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. Simply start with the engine in idle, followed by trimming the motor out by one-half to full trim. Shaft lengths are available in increments of 5. You There are 2 steps to help get a relatively accurate figure. He is also a certified marine technician and the author of a popular text on writing local history. https://www.bornagainboating.com/Get Your Born Again Boating Clothing! 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. motor brackets 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. Here we will guide you in how to get the right boat transom height. "brackets". The engine must be linked to the transom at the proper height for a propeller to best meet specific boating demands. 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. If you are running a slower boat, the exact location of the ventilation plate is less important. var h = d.getElementsByTagName("head"), 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. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. However, you will need an understanding of how the degrees will alter the boats usability. 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. disregard the downward pointing "hooks" at the front of the When fighting waves from the stern, a 20-inch transom is considerably safer. Boats that use longer outboard shafts include: It also cuts into speed and fuel efficiency. Thats a fairly simple list of symptoms, but if your motor is too low, youll probably notice at least one of them. Measure straight down to the lowest point on the hull. 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. Which Navigation Lights Does Your Boat Need? What is the Virtual Sundance Film Festival? Simply start with the engine in idle, followed bytrimming the motor out by one-half to full trim. If the height of the boat transom is off it can cause major issues. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. (616) 364-0666, On all contiguous US part orders over $100. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. High powered boats usually only come in long and extra-long variants. clearInterval(interval); Your email address will not be published. jackplate to a point level with the top of the transom. So from there, I will try to help out by asking questions about your boat such as what type it is and the length. up to the bottom of the motor brackets, (as in #1). Beefier jack plates can be fitted should a boater be looking to mount an outboard with a shorter shaft than their transom demands. out the confusion. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. Among them will be first-timers or those who have recently purchased their boats. When the boattransom is too low, the motor could end up underwater. If your boat planes, pay extra attention to getting the shaft length as close to perfect as possible. The boater must also consider if the boat transom support is designed to bear the weight of a higher mount. 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. If you are looking to repower, they may be able to offer some sage advice. They keep water out of your prop and increase water pressure in the system. minAmount: 300.0, document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML = ''; 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. 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. This measurement was approximately 4". straight edge from the center of the pad, but this time you're measuring Safely but briskly accelerate. I would ask you to go back and measure the transom of your boat. The transom angle is the vertical incline of the transom and is measured in degrees. Measure from the top of the transom to the bottom of the hull. These are vertically aligned so the boater can make adjustments. <> For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. 3 0 obj These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Because of the increased friction, cavitation reduces efficiency. If you decide to make adjustments, please consult a marine engine dealer about the boat design. Whether you already own a boat or looking for your first watercraft we are here to service your needs. A1: Broadly speaking, the outboard motor shaft length for pontoon boat, bass boat, or other larger boats should be long shaft. This is probably the worst case scenario out of the two. Most transom savers can support up to a 150HP motor, which is sufficient for most regular boats. As mentioned above, the operation of the propeller relies on the transom height. With some boats I have a pretty good idea as to what length motor should be hung on them. Having the cavitation plate too low will cause excess drag and reduced performance at high speeds. Cavitation plates are used on the bottom components of boats to help them operate better. 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). 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. 7. 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. loadScript(ptScript); 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. As summer approaches there will be more boaters taking to the water. 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. He is a There are also specialty motor shaft lengths. The height is approximately six inches higher than with a propeller. Check out some hot FAQs to help you get the proper outboard shaft lengths. Brackets are also handy for boats that do not have flat transoms, like canoe-stern sailboats or fan-tailed motor vessels. 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. 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. Or it can have an angle degree as high as 30. However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. If you decide to make some custom adjustments we have theexperience and know-howto make it happen. Oftentimes you will want to adjust the outboard shaft length in order to improve the boat performance such as speed. Re: Dinghy with a long shaft motor? These allow the mounting of a standard length outboard behind the transom. While this is the case there is certain saltwater motors that are extra extra long at 30. What Types of Documents Can be Sent to your Kindle Library? 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}'); To achieve 35 mph with a 6 hp engine, the total weight is 135 lbs (boat motor fuel passengers). There are instances where a lower mount may be okay. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. 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. 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. 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. The pressure behind your hand dropped as you slid your hand back and forth through the water. The mounting height of an outboard motor can impact the speed and handling characteristics of the boat. 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. 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. (Putting a How do you measure a transom on an outboard motor? If you have a question or need additional information. Required fields are marked *. hulls, such as Allisons, Bullets, Strokers, etc., this measurement could Problems with getting the ventilation plate too low include slower hole-shot and lower top-end speeds. Industry standards dictate that for short shaft engines the transom height should be 15. 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. AztH ^zv_ cT,E1K/rAB54| How to Buy a Boat: Tips for a First Time Buyer, Top 10 New Fishing Boats for Under $20,000, What Type is Right for You? Actual shaft length is 21.5" on those. If the height of the boat transom is off it can cause major issues. Many single-engine boats mount a smaller auxiliary motor for emergency use. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. Doing this can have adverse effects. However, youll notice a little increase in drag and a decrease in top-end performance. The first step is to determine the height of your boat's transom. In step 3, add another 10 cm (4") to the previous calculation in order to develop the ideal shaft length. Next, measure from your centerline to where the outboard will be mounted on each side. The clamp bracket on the latest Mercury Four-Stoke-model outboards has five mounting bolt holes spaced .75 inches apart. If you have a jackplate, you may have to get a bit creative in your Like Westshore Marine & Leisure on Facebook! Each one has a totally different effect on the boats performance. Tightening Torque for Engine. 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. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. But, how do you measure it? The center is the point where your outboard motor is (ideally) located. The distance between the ends of a transom is measured in inches. The form of a boats transom varies depending on the manufacturer and model. These cookies ensure basic functionalities and security features of the website, anonymously. Youll need a short shaft outboard if its 15 or less than an inch shorter. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. However, the motor should not be raised more than 5 inches above the standard position. Allowing the propeller to pull water from underneath and push it out behind the boat. For over five years he has worked as a newspaper reporter and historic researcher. If you have an outboard motor, the distance from one end to another will be found on the side or on a label near its bottom. h[0].appendChild(s); Extra-extra long shafts are 30-inches long. Will Charpentier is a writer who specializes in boating and maritime subjects. By clicking Accept, you consent to the use of ALL the cookies. maxAmount: 6500.0, It is extremely important that the boater understands the significance of the transom's height. In the second photo, we've measure down from the top of the Detwiler (127 mm). What is Transom Height? At least if its too long you can raise the motor or "build up" your transom. This is measured by the propeller shaft being parallel to the vessels bottom. 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. The Effects of Standard, Lower and Higher Mounting. There are instances where a lower mount may be okay. Copyright 2017 Dealer Spike All Rights Reserved. will be to the flat part; if you measure to the bottom of the brackets | Sitemap, The Marine Parts Warehouse Outboard Museum, OBR Powerhead / Shortblock Warranty Claim Form, Remanufactured vs. This distance is very important to the performance of you boat. The greater the number, the more the drive may sway (also called tuck under or negative trim). Offshore vessels are often equipped with a large mounting bracket so that the transom can be left at full height. I hope this helps someone out in their search for a new or newer outboard this season. If you decide to make adjustments, please consult a marine engine dealer about the boatdesign. Propshaft in All things considered, sticking with the industry standard is best for the beginner. This could also effect your travelling capabilities on the boat trailer. I believe 20 to 21 inches is the optimum length for a lengthy shaft. Get the latest updates on new products and upcoming sales, 2023 Marine Parts Warehouse Incorporated Disclaimer: As an affiliate I may earn a commission on any qualifying purchases, including those from Amazon.com, at no extra cost to you read more. xmlHttp.setRequestHeader('Content-Type', 'application/json'); If you go too short your more than likely going to cavitate and loose power. }, 100); Picking the right shaft length is mostly a factor of the transom height or the back of the boat. storeDisplayName: "Marine Parts Warehouse", Before we start measuring the outboard shaft length, lets get it clear about whats referring to when we talk about the outboard shaft length. Take a long straight edge, (long carpenter's level or long Before we get started lets see what a boat transom is and what it does. As you can see, the measurement is about 2 1/2". 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. Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. The average transom angle is around 14 degrees. Mounting the motor lower on the boat transom can create excessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. 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. 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 measurement would be the inches of The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". An inch or two probably wont make a big difference, but any more than that will lead to trouble. The shaft length for outboard motors has nothing to do with the water line. s = d.createElement("script"); The outboard comes with mounting holes and brackets. Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. This is simply a measurement taken from the top of the transom (top of My family and I used it to fish, ski (yes, you can ski behind a pontoon boat), and cruise the lakes near our home. You also might not be able to lift the outboard out of the water entirely for storage. There is a simple test to see if your outboard motor is set at the best height. I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. Should I take the raft onto the water and measure the exact distance from the top of the transom to the water line? <> The cookie is used to store the user consent for the cookies in the category "Other. logoColor: "original", As a result, the issue is whether my boat need a short shaft or long shaft motor. Increased RPM and additional horsepower feed the need for speed. Or it can have an angle degree as high as 30. Whether you already own a boat or looking for your first watercraft we are here to service your needs. 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. The average transom angle is around 14 degrees. Your email address will not be published. Outboard motors can be fitted to a variety of boats, so manufacturers have standardized their engines to go on virtually anything. This alone can outweigh the negatives when deciding to adjust the mount upwards. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. For boats equipped with a bracket, calculate the same measurement but based on the bracket and not the transom. It also includes attaching the right engine. 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. Measuring the shaft length can be done in various ways, but the most common way is by using a tape measure. With it comes a lot of responsibility and new things to learn includingboat maintenanceand boat basics.
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