You can find your Mercury outboard model code on an ID plate or sticker. The point where these measurements intersect is your centerline. It also includes attaching the right engine. 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. There is a simple test to see if your outboard motor is set at the best height. With it comes a lot of responsibility and new things to learn includingboat maintenanceand boat basics. Check the literature about your model boat online, and you may be surprised to find that the number is published for you. Then test the boat and adjust the height, if necessary . function gtag(){dataLayer.push(arguments);} maxMicroAmount: 0.0, Wherever the outboard clamping bracket is, use this as the basis for measurement. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. You need JavaScript enabled to view it. Beginning boaters should be aware of the boats measurements. center of the propshaft. So from there, I will try to help out by asking questions about your boat such as what type it is and the length. One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. The pressure behind your hand dropped as you slid your hand back and forth through the water. The collapsing bubbles are loaded with extremely low-pressure water vapor, which causes damage to a variety of surfaces as they collapse. Gear Oil Quantity 195ml(6.6 Fl.oz.) The mounting height of an outboard motor can impact the speed and handling characteristics of the boat. 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. But opting out of some of these cookies may affect your browsing experience. Then adjust the motor in a higher hole with a flat head screwdriver. logoColor: "original", Measure the area of the transom directly where the engine will be mounted. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Typical motor lengths include the following. On the downside, a higher mount can interfere with the boaters steering capabilities. Before we get started lets see what a boat transom is and what it does. All things considered, sticking with the industry standard is best for the beginner. This could also effect your travelling capabilities on the boat trailer. the propshaft below or above the pad. The height of the boat transom dictates the size of the outboard motor. motor brackets The how to measure the shaft length of an outboard motor is a question that many people have asked. Since the length of the shaft of your outboard is associated with the size boat, smaller engines will generally have shorter shafts. Place the point of a yardstick at the middle of the top of the boat transom. How-To: Pick A Great Portable Outboard Motor (2023 Guide) Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. You also have the option to opt-out of these cookies. disregard the downward pointing "hooks" at the front of the It is extremely important that the boater understands the significance of the transoms height. Propshaft in A: The short answer is Yes. What are Apple Podcasts Subscriptions and Channels? Re: Dinghy with a long shaft motor? Where Onboard a Boat is the Transom Located and More About Transom Heights A propeller operates based on the height of the transom. The height is approximately six inches higher than with a propeller. Follow Westshore Marine & Leisure on Twitter! 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. 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. Theyre also useful if the back of your boat has a non-standard measurement. 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. You can use a longer shaft than recommended and your boat will work fine. However, the motor should not be raised more than 5 inches above the standard position. Kicker Motor Shaft Length - This Old Boat - Lake Ontario United - Lake The clamp bracket is designed so that the engine's mounting height on the transom can be adjusted higher than standard. Your email address will not be published. The outboard comes with mounting holes and brackets. 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). However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. And thats usually the case since the electric outboards are designed with larger and more efficient propeller that needs longer shaft. If youd like to see this in video format, skip to 0:44 in the below YouTube Video: Is it OK to put a long shaft outboard on a boat thats rated for a short shaft? Measure from the top of the transom to the bottom of the hull. This measurement is primarily designed for single motor propulsion. There Engine Oil Mixing Ratio Fuel 50: Engine Oil 1. Simply start with the engine in idle, followed by trimming the motor out by one-half to full trim. Here we will guide you in how to get the right boat transom height. As you can see, the measurement is about 2 1/2". Industry standards dictate that for short shaft engines the transom height should be 15. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. No one wants to have issues with a new transom or boat repairs. There are also specialty motor shaft lengths. All rights reserved. Some boats are equipped with transom-hung outboards while others have a bracket. Small motors built for sailboats might come in a unique configuration with an extremely long shaft since these are mounted higher off the water. var prefix = 'ma' + 'il' + 'to'; Boat Transom Heights - The Beginner's Guide | My Westshore Pretty easy to figure out but like I said its crucial to pairing a motor with a boat. 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. parallel with the straight edge. 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. Happy boating! If your outboard motor height. Other boats that need long shafts are. It can also improve the experience of driving a faster boat. These two measurements will give you the length of the shaft you need. (3) Move horizontally across the chart until you hit the graph curve. 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. Most of the standard engined boats it takes shafts that are 15-30inches long. Buying a boat can be an exciting purchase. Step 4. Most of the time, adding a hydrofoil to an outboard improves performance. <>/Metadata 127 0 R/ViewerPreferences 128 0 R>> Among them will be first-timers or those who have recently purchased their boats. What is Transom Height? All rights reserved. If you decide to make some custom adjustments we have theexperience and know-howto make it happen. Outboard Motor Shaft Length - LeeRoy's Ramblings Cavitation plates are used on the bottom components of boats to help them operate better. But in many cases, its a little more complicated than that alone. A reverse transom that sits too high can impact the propellers of the motor and motor bracket. 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. straight edge on the top of the transom to "extend" it out It is unsafe to have the engine block too close to the water on a low transom. For boats equipped with a bracket, calculate the same measurement but based on the bracket and not the transom. While this is the case there is certain saltwater motors that are extra extra long at 30. Safely but briskly accelerate. This distance is very important to the performance of you boat. Save my name, email, and website in this browser for the next time I comment. How to Measure Transom Height For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. mpeInit(); It also cuts into speed and fuel efficiency. and I'll explain it better, (or point you to someone that can help. var ptScript = "https://cdn.paytomorrow.com/js/pt-mpe.min.js"; My family and I used it to fish, ski (yes, you can ski behind a pontoon boat), and cruise the lakes near our home. This cookie is set by GDPR Cookie Consent plugin. How To Measure Outboard Motor Shaft Length [Long v Short] - Boating Hub 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. The motor is what powers the boat so the two go hand-in-hand. 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. No one wants to have issues with a new transom or boat repairs. Add yours in the comment and Ill get back to you asap. Anything bigger than that your obviously going to need an extra long shaft. If mounting directly to a boat transom: Measure from the top of the transom down to the bottom of the hull or keel (lowest point). Problems with getting the ventilation plate too low include slower hole-shot and lower top-end speeds. Oftentimes you will want to adjust the outboard shaft length in order to improve the boat performance such as speed. var xmlHttp = new XMLHttpRequest(); (127 mm). A: Any boat that has a 21 to 27 inch aft transom will need an extra long shaft outboard. 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. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. At least if its too long you can raise the motor or "build up" your transom. You #1: Height 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. The propellers will also have trouble reaching the water. With a jack plate, you can mount it exactly where you want it. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. To make the yard stick long enough to measure the length of all the clubs, tape the ruler to the top. If you said something smaller than that, thats where it can get tricky. Before we get started lets see what a boat transom is and what it does. s = d.createElement("link"); A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. How do you measure a transom on an outboard motor? endobj A1: Broadly speaking, the outboard motor shaft length for pontoon boat, bass boat, or other larger boats should be long shaft. bracket forward with a straight edge to where you can then measure up Why wont Touch ID be under the screen in the iPhone 15 and iPhone 16? This is also known as the shaft length. To do so, take a measurement from the very top to the very bottom of the transom in the precise center.

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