endobj Any questions? }, 100); Having the cavitation plate a bit lower than the transom is preferable to having it too high. Youll need a short shaft outboard if its 15 or less than an inch shorter. Another important measurement is the transom angle. What is Transom Height? Plus, a low transom cut is an invitation for the water to flood the boat. Before we get started lets see what a boat transom is and what it does. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. 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. Also, how do you determine the length of an outboard transom? The point where these measurements intersect is your centerline. Engine height with stepped hull at transom - before I screw things up 1 0 obj Not to measure boat speed, but to gauge the mounting height of the outboard motor on the boat transom. (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. These cookies will be stored in your browser only with your consent. 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. Increased RPM and additional horsepower feed the need for speed. As summer approaches there will be more boaters taking to the water. It can also improve the experience of driving a faster boat. He is also a certified marine technician and the author of a popular text on writing local history. I show you how to consistently measure your prop to pad height. center of the propshaft. Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. Increased RPM and additional horsepower feed the need for speed. A: The short answer is Yes. There are also specialty motor shaft lengths. 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. Higher mounting decisions should be left to the professionals. However, youll notice a little increase in drag and a decrease in top-end performance. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. 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. Beefier jack plates can be fitted should a boater be looking to mount an outboard with a shorter shaft than their transom demands. s.setAttribute("rel", "stylesheet"); For slower boats, its less critical to. Step 2: Three Variables to Consider Like Westshore Marine & Leisure on Facebook! maxAmount: 6500.0, disregard the "hooks" at the front of the Some fishing boats can handle the motor being underwater. 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. Safely but briskly accelerate. The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. Picking the right shaft length is mostly a factor of the transom height or the back of the boat. Some outboards have a serial number that tells you which shaft length to go for. var h = d.getElementsByTagName("head"), 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. of the "bullet" on your lower unit. Tilt your motor until the bullet of the gearcase is I would ask you to go back and measure the transom of your boat. |. would be more accurate.) Measure from the top of the transom to the bottom of the hull. 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. If you said something smaller than that, thats where it can get tricky. How the outboard will sit on the back of the boat depends on how the transom is designed. However, your boat will have slightly more drag which will reduce your maximum speed. How To Measure Outboard Motor Shaft Length [Long v Short] - Boating Hub Once you know what will fit on your hull, you can fine-tune your choice based on the performance youre looking for and how you use the boat. What types of boat need an extra long shaft? With it comes a lot of responsibility and new things to learn includingboat maintenanceand boat basics. 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. You also might not be able to lift the outboard out of the water entirely for storage. PDF Outboard shaft lengths and transoms - Boat Builder Central endobj 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 same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. enableMoreInfoLink: true, When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. 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. Mounting kicker motor - General Discussion Forum | In-Depth Outdoors The amount of degrees the transom leans back from vertical is known as the transom angle. <> Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. measuring; you may have to "extend" the flat part of the If you are running a slower boat, the exact location of the ventilation plate is less important. This will be the Raising an outboard higher on the transom can reduce drag and raise top speed. Anything bigger than that your obviously going to need an extra long shaft. 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. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. If it measures 15" or with in a inch of that you will need a short shaft outboard. var h = d.getElementsByTagName("head"), How Low Should a Motor Set on a Pontoon Boat? (Explained) So how to determine the outboard shaft length? 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. This email address is being protected from spambots. displayPrimeOffers: true, Industry standards dictate that for short shaft engines the transom height should be 15. Is my outboard long or short shaft? var interval = setInterval(function () { No one wants to have issues with a new transom or boat repairs. 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. Your email address will not be published. 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. Boat transomangles play a pivotal role in the flexibility of the boats trimming abilities. Some fishing boats can handle the motor being underwater. It is extremely important that the boater understands the significance of the transom's height. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Beginning boaters should be aware of the boats measurements. So in hopes that this will help out some new boaters this spring, here's a little rundown on outboard shaft sizes and how to figure out which one you actually need. steel ruler, etc. The boat transom can be flat with zero degree angles. LOYALHEARTDY Outboard Motor 6 HP 2-Stroke Inflatable Fishing Boat 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. These two measurements will give you the length of the shaft you need. My family and I used it to fish, ski (yes, you can ski behind a pontoon boat), and cruise the lakes near our home. Check out the full chart of the Mercury outboard model code and its features. Simply start with the engine in idle, followed bytrimming the motor out by one-half to full trim. <>/Metadata 127 0 R/ViewerPreferences 128 0 R>>
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