<> No matter what size of boat you are running, one of the most critical choices you can make when buying an outboard motor is the shaft length. 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. This is probably the worst case scenario out of the two. document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML = ''; a Detwiler manual jackplate. Here we will guide you in how to get the right boat transom height. Increased RPM and additional horsepower feed the need for speed. 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). 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 pros and cons of properly . 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. debugMode: false, When fighting waves from the stern, a 20-inch transom is considerably safer. With it comes a lot of responsibility and new things to learn includingboat maintenanceand boat basics. 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. If possible for your peace of mind and not let down that magnificent purchase opportunity, place that 08 kicker at back transom and test for yourself. want to measure from the transom to the flat part of this bracket, Doing so, will put the propeller right below the boat. For most boaters this is a no brainer, but for the novice or inexperienced boater it may be a tougher question. You may wonder how deep your prop should be in the water. Engine Oil Mixing Ratio Fuel 50: Engine Oil 1. How to Choose Between a Motor Tote and Transom Saver to Support an What types of boat need an extra long shaft? These allow the mounting of a standard length outboard behind the transom. These cookies ensure basic functionalities and security features of the website, anonymously. For example, you can have the Mercury outboard shaft length by model code. displayMicroOffers: false, xmlHttp.setRequestHeader('Content-Type', 'application/json'); An inch or two probably wont make a big difference, but any more than that will lead to trouble. No one wants to have issues with a new transom or boat repairs. Move the bracket as close to the center of the transom as possible while still maintaining clearance to allow the main outboard or rudder to reach its full range of motion without contacting the kicker motor. Outboard Motor Shaft Length & HP to Boat Calculating Top 10 Choices for Boaters, Mercury Introduces 600HP V12 Verado Outboard Engine, The Outboard Expert: Tohatsu Propane Outboard Engine. You reply, "Im not sure, I think its a long". The transom is the flat vertical section at the rear of the boat. With this in mind, how can I determine if my outboard has a short or long shaft? This placement is not only recommended but it will give you the best performance compared to something that is too long or too short. How Transom Height Is Measured This number will likely be shorter than that for a single-engine installation since you do not necessarily measure to the point of the keel. :$I>M W$h"%U_yzIb?]NHg_G|r@nX eTf."SQ Where Onboard a Boat is the Transom Located and More About Transom Heights A propeller operates based on the height of the transom. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. It also cuts into speed and fuel efficiency. 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. 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. Make sure that you are measuring straight up, at a 90 degree angle to Required fields are marked *. Many single-engine boats mount a smaller auxiliary motor for emergency use. How to Measure Outboard Shaft Length: The Only Guide You Need MPW eBay Store - Thousands of New OEM Old Stock Parts! Necessary cookies are absolutely essential for the website to function properly. What is the Virtual Sundance Film Festival? As a yacht designer and boater, I prefer longer shafts. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. They operate as a planing surface, allowing your boat to climb to the top more quickly. 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. For over five years he has worked as a newspaper reporter and historic researcher. Buying a boat can be an exciting purchase. This is somewhat similar to #2, in that you are again measuring with a C Cheaptoon Cadet Joined Aug 4, 2010 Messages 28 Aug 24, 2010 #4 Re: Motor height on pontoon? Determining Your Boat Transom Angle The transom angle - commonly measured in degrees - is the transom's vertical inclination. 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. He is a A yardstick will help you determine if your outboard engine is at the right height. Boats with more engine power and weight require longer shaft outboards for better balance. All rights reserved. Should I take the raft onto the water and measure the exact distance from the top of the transom to the water line? We also use third-party cookies that help us analyze and understand how you use this website. var ptScript = "https://cdn.paytomorrow.com/js/pt-mpe.min.js"; There are instances where a lower mount may be okay. Place the point of a yardstick at the middle of the top of the boat transom. d.addEventListener("DOMContentLoaded", function (e) { 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. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Then test the boat and adjust the height, if necessary . Usually speaking, the farther the outboard is set off the transom, the higher the propeller should be in the water (or the higher the outboard can be mounted). Chances are the boat was designed with a specific size of outboard in mind. This distance is very important to the performance of you boat. A reversetransom that sits too high can impact the propellers of the motor and motor bracket. Later in the article is an image that shows you exactly where to measure. Among them will be first-timers or those who have recently purchased their boats. Workboats, sailboats, and displacement-hulled boats fall into this category. Anything bigger than that your obviously going to need an extra long shaft. The first step is to determine the height of your boat's transom. This exhaust port should be about 1 inch above the water line when the boat is idling. Boats that use longer outboard shafts include: Its still smart to measure it yourself though, just in case, the design changed over the years. Or it can have an angle degree as high as 30. Knowing how this can affect the overall operation of the boat is a factor to be considered. steel ruler, etc. Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. If the height of the boat transom is off it can cause major issues. The standard shaft length for most outboard engines less than 125 horsepower is 20 inches. This illustration depicts four different outboard mounting height options (courtesy Mercury Marine). } xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); 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. Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. So from there, I will try to help out by asking questions about your boat such as what type it is and the length. So its easier and safer to communicate with the dealer with the exact measurement of outboard shaft length in order to get the right model. 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. 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. Proper Mounting Height for an Outboard - Gone Outdoors Smaller boats may use adjustable jack plates that can be changed to fit any outboard. The propellers will also have trouble reaching the water. Gear case sits just below or at the hull depth due to the deep v. The cookies is used to store the user consent for the cookies in the category "Necessary". Or measure from the main engine prop up to the water line? A: Any boat that has a 21 to 27 inch aft transom will need an extra long shaft outboard. Using your existing control box and gauges will save you quite a bit of money in the end. I live for the weekends when I can go out on the water and escape the stress of life on land. You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. The form of a boats transom varies depending on the manufacturer and model. To make the yard stick long enough to measure the length of all the clubs, tape the ruler to the top. The center is the point where your outboard motor is (ideally) located. maxMicroAmount: 0.0, The prop will be in cleaner, harder water as it advances farther aft, making it more efficient. clearInterval(interval); Triton. Most transom savers can support up to a 150HP motor, which is sufficient for most regular boats. Step 4. There <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Your email address will not be published. Theyre also useful if the back of your boat has a non-standard measurement. Doing this can have adverse effects. the propshaft below or above the pad. It also decreases the boats lift and increases the time it takes for the boat to reach plane. Youll also want to pay attention when youre in shallow water because your prop will be lower than normal. In lower mounting, the engine is set lower than the recommended standard. The motor length corresponds to the transom height of the boat, measured from the keel to gunwale at the transom. }) } }); })(document); ), and place it on the bottom of the pad in the center. Take the center measurement from the top to the bottom of the hull. ensure that your measurement is accurate. Boaters who consider going with a higher mount can see increased speeds. Which Navigation Lights Does Your Boat Need? Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. 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. To sum up, there is a simple calculator of the shaft length for outboard motors: Outboard Shaft Length = Transom Height +/- Factors. Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. (updated With the outboard shaft length too long, meaning the prop is too deep in the water, the engine wont be as efficient, and the fuel burn is high. 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. 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. primeApr: 12.99, 7. How high exactly do you have to raise the transom?- - Outboard Jets Extra-extra long shafts are 30-inches long. Like Westshore Marine & Leisure on Facebook! Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. They keep water out of your prop and increase water pressure in the system. Beginning boaters should be aware of the boats measurements. A big NO. See When St. Peters Basketball Games Are Today! Higher mounting decisions should be left to the professionals. The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. 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. Follow Westshore Marine & Leisure on Twitter! You If you have a question or need additional information. Beginning boaters should be aware of the boats measurements. The propellers will also have trouble reaching the water. ), Al Shields These are vertically aligned so the boater can make adjustments. If your boat planes, pay extra attention to getting the shaft length as close to perfect as possible. With a jack plate, you can mount it exactly where you want it. 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. Step 2: Three Variables to Consider This measurement would be the inches of to where the brackets were actually resting on the transom. This alone can outweigh the negatives when deciding to adjust the mount upwards. up to the bottom of the motor brackets, (as in #1). 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. How To Measure Outboard Motor Shaft Length [Long v Short] - Boating Hub
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