The performance of these boats depends on quite a lot of factors, but getting the outboard length just right is an essential first step. Offshore vessels are often equipped with a large mounting bracket so that the transom can be left at full height. Most of the standard engined boats it takes shafts that are 15-30inches long. Your at your local outboard dealer shopping for a new motor and the salesman hits you with the question, "short or long shaft?". If your boat is newer and the manufacturer is still in business, you might also want to try to give them a call. When the boattransom is too low, the motor could end up underwater. }) } }); })(document); The dealer just hit you with the long or short shaft question and you have no clue as to what you need or even what he's talking about. https://www.bornagainboating.com/Get Your Born Again Boating Clothing! The height of the boat transom dictates the size of the outboard motor. Spark Plug 25.0nm(18.4 Ft-lb) (2.55 Kgf-m) Your email address will not be published. Because of the increased friction, cavitation reduces efficiency. A big NO. straight edge from the center of the pad, but this time you're measuring
Whether you already own a boat or looking for your first watercraft we are here to service your needs. He is a If you have a question or need additional information. mpeInit(); It moves an outboard up and down to optimize performance and enable a boat to venture into shallower water than it might otherwise. August 9/08). This also means it can affect the safety of the boat. Here we will guide you in how to get the right boat transom height. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. Picking the right shaft length for your outboard is an essential step in getting the best performance from your boat. The average transom angle is around 14 degrees. a Detwiler manual jackplate. It does not store any personal data. If it measures between 17 and 22, you'll want to go with a long shaft motor. 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. Knowing how this can affect the overall operation of the boat is a factor to be considered. Many boat transoms are modified to use a different length of outboard by using a bracket. Some fishing boats can handle the motor being underwater. 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). Mounting the outboard a little bit lower than the standard point could avoid the possible ventilation and slip on acceleration. Boats that use longer outboard shafts include: 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 cookie is used to store the user consent for the cookies in the category "Other. 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. Copyright 1999-2023 Boats Group. 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 12-14 foot boats can require either a short or long shaft outboard depending on the style of the boat and the brand. Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. Follow Westshore Marine & Leisure on Wordpress! I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. function loadScript(script) { Whether you already own a boat or looking for your first watercraft we are here to service your needs. All rights reserved. } Some outboards have a serial number that tells you which shaft length to go for. ensure that your measurement is accurate. The collapsing bubbles are loaded with extremely low-pressure water vapor, which causes damage to a variety of surfaces as they collapse. Step 3: Add another 10 cm (4'') to the previous calculation for the final ideal shaft length. <>
Say the 20 shaft is a long shaft length for gas engines, but it is a short shaft length for electric outboard motors. Some may call it a standard length while others may call it a short or a long shaft. center of the propshaft. (In the case of the faster
height (that I'm aware of); probably the most common is:
How to Measure Transom Height For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. Take a long straight edge, (long carpenter's level or long
As a result, the issue is whether my boat need a short shaft or long shaft motor. Measure from the top of the straight edge to the center of the front
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. What matters is the actual measurement in the specifications, not the name. What is Transom Height? Simply start with the engine in idle, followed bytrimming the motor out by one-half to full trim. This provides seaworthiness and offers maximum protection from large seas. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. 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). 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. However, there may be times when a boater strays away from these recommendations. When trimming your motor, they provide you a greater bow response. Always weigh the risks of making adjustments. However, youll notice a little increase in drag and a decrease in top-end performance. Measure from the top of the transom to the bottom of the hull. This will be the
The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. Beginning boaters should be aware of the boats measurements. Knowing how this can affect the overall operation of the boat is a factor to be considered. Then finally test your outboard, if the mount is perfect. Get the latest updates on new products and upcoming sales, 2023 Marine Parts Warehouse Incorporated
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. Then, you can pick the right engine. Then open up the clamp bucket. The engine may be lifted one inch for every eight to ten inches of distance between the transom and the prop, according to a boat riggers rule of thumb. The outboard comes with mounting holes and brackets. maxAmount: 6500.0, 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. What the relationship to the pontoons is, I couldn't say. Boats with extended transoms, brackets that extend the mounting bracket for the outboard motor behind the back of the boat, can use a higher outboard height. hulls, such as Allisons, Bullets, Strokers, etc., this measurement could
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Two years ago, I bought a Boston Whaler to fish off the coast. You'll need a short shaft outboard if it's 15 or less than an inch shorter. We also use third-party cookies that help us analyze and understand how you use this website. However, the motor should not be raised more than 5 inches above the standard position. As with anything, there are exceptions to the rule. The cookie is used to store the user consent for the cookies in the category "Analytics". This cookie is set by GDPR Cookie Consent plugin. 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. If you decide to make adjustments, please consult a marine engine dealer about the boatdesign. If you have a jackplate, you may have to get a bit creative in your
Among them will be first-timers or those who have recently purchased their boats. Safely but briskly accelerate. 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. The propellers will also have trouble reaching the water. You need JavaScript enabled to view it. Amazon has plate extensions to allow adjustments without buying a new motor: T-H Marine Jack Plate Extension. 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. The height is approximately six inches higher than with a propeller. 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. 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. I live for the weekends when I can go out on the water and escape the stress of life on land. 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". Place the clubs bottom on the ground as though it were going to be used to strike a golf ball. s.setAttribute("type", "text/javascript"); This was the height of my 225 Yamaha on my TR21
One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. Take your time and understand your boat and your entire transom. I show you how to consistently measure your prop to pad height. For example, you can have the Mercury outboard shaft length by model code. Necessary cookies are absolutely essential for the website to function properly. Add the two measurements and you get 6 1/2". Ill also explain the difference between short and long shafts and how they vary by type of 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. In step 3, add another 10 cm (4") to the previous calculation in order to develop the ideal shaft length. relation to pad
The Effects of Standard, Lower and Higher Mounting. 2019s List of the Best Recreational Pontoon Boats for Sale. What Types of Documents Can be Sent to your Kindle Library? Be sure to measure carefully and research thoroughly before diving in. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Like Westshore Marine & Leisure on Facebook! disregard the "hooks" at the front of the
var prefix = 'ma' + 'il' + 'to'; The center is the point where your outboard motor is (ideally) located. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. Buying a boat can be an exciting purchase. 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}'); Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. This, however, is not recommended for the beginning boater. 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. Check out the full chart of the Mercury outboard model code and its features. What are Apple Podcasts Subscriptions and Channels? }, 100); Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. The pros and cons of properly . 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. Engine Oil Mixing Ratio Fuel 50: Engine Oil 1. You run the risk of possibly unsafe handling if you attempt to put a long shaft engine on a transom designed for a short shaft engine. 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. endobj
This is the dimension you'll need when selecting a width for your outboard motor's mounting bracket. clearInterval(interval); would be more accurate.) Boaters who consider going with a higher mount can see increased speeds. A2: Instead of changing to the short outboard shaft, you can try the Jack Plate first. Also, the boat will be more likely to hit bottom or submerge objects such as rocks or logs. Sailboats use these sometimes, as well as some boaters who want to install a much smaller auxiliary motor to use in case of primary engine failure. The transom is the back of the boat where the motor is hung. Next, measure from your centerline to where the outboard will be mounted on each side. ), and place it on the bottom of the pad in the center. 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. Picking the right shaft length is mostly a factor of the transom height or the back of the boat. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. To make the yard stick long enough to measure the length of all the clubs, tape the ruler to the top. I believe 20 to 21 inches is the optimum length for a lengthy shaft. :$I>M W$h"%U_yzIb?]NHg_G|r@nX eTf."SQ resting on the transom if you had the motor all the way down on the boat
Higher mounting decisions should be left to the professionals. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. Knowing the width, height and depth of your transom allows you to make several important decisions when selecting or purchasing a new outboard. If the height of the boat transom is off it can cause major issues. If so, send me an
Since the length of the shaft of your outboard is associated with the size boat, smaller engines will generally have shorter shafts. With this in mind, how can I determine if my outboard has a short or long shaft? You also have the option to opt-out of these cookies. I also love helping others, which is why I created this website. An inch or two probably wont make a big difference, but any more than that will lead to trouble. measuring; you may have to "extend" the flat part of the
But in many cases, its a little more complicated than that alone. So from there, I will try to help out by asking questions about your boat such as what type it is and the length. How Transom Height Is Measured Most of the time, adding a hydrofoil to an outboard improves performance. Outboard shaft length plays a crucial role in the performance of your boat. Doing this can have adverse effects. Small portable outboards ranging from 2 to 20 horsepower are usually sold only in short or long shaft versions. As mentioned above, the operation of the propeller relies on the transom height. MarinePartsMan.com also says that V6 bass-boat engines have a 20-inch shaft. However, with the outboard shaft length too short, meaning the prop is too close to the surface, the engine is likely to ventilate and therefore slip on acceleration or lose power. Boat Transom Heights The Beginners Guide, Buying a boat can be an exciting purchase. endobj
With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. Smaller boats may use adjustable jack plates that can be changed to fit any outboard. 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. Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. Safely but briskly accelerate. function mpeInit() { In lower mounting, the engine is set lower than the recommended standard. 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. It varies between different motors and boats. 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. logoColor: "original", So if you are measuring the outboard shaft length for the powerboat, planing boat, or any boat for which the speed is the priority, take the outboard shaft length 1 to 1.5 (depending on your boat types) shorter than standard would be better. When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. There are a series of four to six holes at the top of the bracket, and the lower bolts actually fit into slots. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. 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. In lower mounting, the engine is set lower than the recommended standard. The distance between the ends of a transom is measured in inches. *The Factors indicates the adjustment affected by on your boat type, the outboard working environment, and the transom distance as discussed above. Of course, its always best to go with standard practices when choosing thebest boat engine. Make sure that you are measuring straight up, at a 90 degree angle to
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This cookie is set by GDPR Cookie Consent plugin. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. Another important measurement is the transom angle. This is measured by the propeller shaft being parallel to the vessels bottom. Will Charpentier is a writer who specializes in boating and maritime subjects. It is extremely important that the boater understands the significance of the transom's height. (updated
However, you will need an understanding of how the degrees will alter the boats usability. Higher mounting decisions should be left to the professionals. If your boat planes, pay extra attention to getting the shaft length as close to perfect as possible. By clicking Accept, you consent to the use of ALL the cookies. Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. Among them will be first-timers or those who have recently purchased their boats. (616) 364-0666, On all contiguous US part orders over $100. It also includes attaching the right engine. | Sitemap, The Marine Parts Warehouse Outboard Museum, OBR Powerhead / Shortblock Warranty Claim Form, Remanufactured vs. var BCData = {"csrf_token":"d7ecb6b56891bb66aee12dbc01a80162b3ed582c1acbe30f16fc9f1b2abc362f"}; Learn More About Your Boats Systems By Joining The Born Again Boating Academy! No one wants to have issues with a new transom or boat repairs. Increased RPM and additional horsepower feed the need for speed. This cookie is set by GDPR Cookie Consent plugin. All things considered, sticking with the industry standard is best for the beginner. All rights reserved. Where Onboard a Boat is the Transom Located and More About Transom Heights A propeller operates based on the height of the transom. Charles Plueddeman is Boats.com's outboard, trailer, and PWC expert. Industry standards dictate that for short shaft engines the transom height should be 15. Before we get started lets see what a boat transom is and what it does. Step 2 requires the propeller's radius (check the user manual and then the technical drawing). Most transom savers can support up to a 150HP motor, which is sufficient for most regular boats. 3 0 obj
There are instances where a lower mount may be okay. Depending on the manufacturer, size names might change.
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