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I would ask you to go back and measure the transom of your boat. height (that I'm aware of); probably the most common is: 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. With some boats I have a pretty good idea as to what length motor should be hung on them. The transom in a boat today is a place to hang your outboard motor. Then, you can pick the right engine. Follow Westshore Marine & Leisure on Twitter! See When St. Peters Basketball Games Are Today! Displacement hulled vessels like sailboats and workboats can benefit from a little more space between the hull and cavitation plate, but not much. When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. endobj 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. Ill also explain the difference between short and long shafts and how they vary by type of boat. Over time, Boating Hub has grown into a resource for boating enthusiasts around world. Height Measurement: Recommended Shaft Length: 14" - 17.25" 15" Shaft (Short) 17.25" - 19.5" Varies by application 19.5" - 22.5" Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. This exhaust port should be about 1 inch above the water line when the boat is idling. 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. How can you figure out what your transom angle is? When fighting waves from the stern, a 20-inch transom is considerably safer. out the confusion. Save my name, email, and website in this browser for the next time I comment. (function () { 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. One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. Measure from the top of the transom to the bottom of the hull. In step 3, add another 10 cm (4") to the previous calculation in order to develop the ideal shaft length. 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. 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). Add the two measurements and you get 6 1/2". Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. Commonly, the transom angle ranges from 0-30 degrees, with the average transom angle set at 14 degrees. https:/. What the relationship to the pontoons is, I couldn't say. Copyright 1999-2023 Boats Group. All things considered, sticking with the industry standard is best for the beginner. Other factors to consider when determining the mounting height of an outboard are related to performance. boats.com, 1221 Brickell Avenue, 23rd Floor, Miami, FL 33131, USA. Having the cavitation plate a bit lower than the transom is preferable to having it too high. However, you will need an understanding of how the degrees will alter the boats usability. Most of the time, adding a hydrofoil to an outboard improves performance. 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. Long shafts are 20-inches long. h[0].appendChild(s); Its still smart to measure it yourself though, just in case, the design changed over the years. Increased RPM and additional horsepower feed the need for speed. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. It is where the outboard is mounted, and some boat owners place the name of the boat. If it measures 15" or with in a inch of that you will need a short shaft outboard. However, you will need an understanding of how the degrees will alter the boats usability. Most of the standard engined boats it takes shafts that are 15-30inches long. would be more accurate.) We also use third-party cookies that help us analyze and understand how you use this website. 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. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; Finding the right size is a matter of looking at what youve got and taking out the measuring tape. Industry standards dictate that for short shaft engines the transom height should be 15. You'll need a short shaft outboard if it's 15 or less than an inch shorter. var h = d.getElementsByTagName("head"), The height of the boat transom dictates the size of the outboard motor. So how to measure outboard shaft length? (updated This is also known as the shaft length. To do so, you will want to measure at the exact center of the transom from the very top to the very bottom. If the propeller fails to ventilate, the motor is mounted to low. <> The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. The cookie is used to store the user consent for the cookies in the category "Performance". (function (d) { *The Factors indicates the adjustment affected by on your boat type, the outboard working environment, and the transom distance as discussed above. 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. 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. (127 mm). 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. The outboard comes with mounting holes and brackets. This is a measurement that has been used for BassCats, I'm An inch or two probably wont make a big difference, but any more than that will lead to trouble. Happy boating! gtag('js', new Date()); s.setAttribute("src", script); (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. It was a 23-foot Crestliner Grand Cayman pontoon boat. want to measure from the transom to the flat part of this bracket, 2019s List of the Best Recreational Pontoon Boats for Sale. primeApr: 12.99, Knowing how this can affect the overall operation of the boat is a factor to be considered. Gear Oil Quantity 195ml(6.6 Fl.oz.) You may wonder how deep your prop should be in the water. } Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. 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 mounting height of an outboard motor can impact the speed and handling characteristics of the boat. since 1986. These cookies track visitors across websites and collect information to provide customized ads. You need JavaScript enabled to view it. It will ensure that the outboards trim will be effective, and it will save you gas too. boats.com is part of the Boats Group Network. The pros and cons of properly . If your boat planes, pay extra attention to getting the shaft length as close to perfect as possible. If youre looking for a bracket that can handle motors of up to 10/15 horsepower, go no further. function gtag(){dataLayer.push(arguments);} To achieve 35 mph with a 6 hp engine, the total weight is 135 lbs (boat motor fuel passengers). C Cheaptoon Cadet Joined Aug 4, 2010 Messages 28 Aug 24, 2010 #4 Re: Motor height on pontoon? Next, measure from your centerline to where the outboard will be mounted on each side. If you have a fast boat, getting the outboards cavitation plate at the same level of the hull will ensure quick hole shot and fast top-end speeds. Check out the Westshore Marine & Leisure google plus page! Whether you already own a boat or looking for your first watercraft we are here to service your needs. (In the case of the faster However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. As a result, the issue is whether my boat need a short shaft or long shaft motor. Knowing how this can affect the overall operation of the boat is a factor to be considered. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. You also might not be able to lift the outboard out of the water entirely for storage. Since the ventilation plate & foil are burried under water it is obviously too low. To achieve this, the motor itself has to be attached at the correct height. hulls, such as Allisons, Bullets, Strokers, etc., this measurement could Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. 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). With the long side (22 1/2), place a carpenters square ) in opposition to the keel. Then open up the clamp bucket. This could also effect your travelling capabilities on the boat trailer. Each one has a totally different effect on the boats performance. A transom saver, which can change the spacing between the lower unit and the trailer, negates some of the support. This measurement would be the inches of 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. Place the bracket on the transom to the left of the main outboard or rudder. #2. It is where the outboard is mounted, and some boat owners place the name of the boat. However, there may be times when a boater strays away from these recommendations. 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". bracket forward with a straight edge to where you can then measure up Beginning boaters should be aware of the boats measurements.