If you decide to make some custom adjustments we have theexperience and know-howto make it happen. This is measured by the propeller shaft being parallel to the vessels bottom. Boaters who consider going with a higher mount can see increased speeds. Mounting the outboard a little bit lower than the standard point could avoid the possible ventilation and slip on acceleration. Mounting the motor lower on the boat transom can create excessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. The cookie is used to store the user consent for the cookies in the category "Performance". It also includes attaching the right engine. Always weigh the risks of making adjustments. One of the great things about an outboard motor is how versatile it is. Rest the yard stick or another suitable straight edge along the keel on the bottom of the boat so that it makes a straight line aft to the outboard. And the rule of thumb is that you should keep the cavitation plate level with the bottom or keel of the boat. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. What Types of Documents Can be Sent to your Kindle Library? The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". up to the bottom of the motor brackets, (as in #1). What types of boat need an extra long shaft? Proper Mounting Height for an Outboard - Gone Outdoors Height Measurement: Recommended Shaft Length: 14" - 17.25" 15" Shaft (Short) 17.25" - 19.5" Varies by application 19.5" - 22.5" But, how do you measure it? Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. not sure that it's still used. Each one has a totally different effect on the boats performance. It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. since 1986. How to Buy a Boat: Tips for a First Time Buyer, Top 10 New Fishing Boats for Under $20,000, What Type is Right for You? straight edge on the top of the transom to "extend" it out Check out the full chart of the Mercury outboard model code and its features. Is my outboard long or short shaft? We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Buying a boat can be an exciting purchase. Not to measure boat speed, but to gauge the mounting height of the outboard motor on the boat transom. 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. You dont have to be a mathematician to determine the correct boat transomangle. This will keep the prop in the water when the boat pitches in waves, or hobby-horses. s = d.createElement("script"); manufacturer will recommend the outboard height according to the bracket shape and length. Two years ago, I bought a Boston Whaler to fish off the coast. (function (d) { How To Measure Outboard Motor Shaft Length [Long v Short] - Boating Hub Will Charpentier is a writer who specializes in boating and maritime subjects. This distance is very important to the performance of you boat. You'll need a short shaft outboard if it's 15 or less than an inch shorter. Of course, its always best to go with standard practices when choosing thebest boat engine. %PDF-1.7 As you can see, the measurement is about 2 1/2". Re: Dinghy with a long shaft motor? This also means it can affect the safety of the boat. 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. 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. Or it can have an angle degree as high as 30. 2 0 obj 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. Measuring Motor Height - BassBoat Central This is a measurement that has been used for BassCats, I'm You Yamaha Outboard Motors: How To Measure Leg Length 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. I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. If you have an outboard motor, the distance from one end to another will be found on the side or on a label near its bottom. 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). The brackets can add 1 inch to the overall mounting height of the outboard. Over time, Boating Hub has grown into a resource for boating enthusiasts around world. 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. :$I>M W$h"%U_yzIb?]NHg_G|r@nX eTf."SQ In the past, though, it housed the officers and captain of 17th, 18th and 19th century sailing ships. How do you measure a transom on an outboard motor? Wherever the outboard clamping bracket is, use this as the basis for measurement. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Boats with more engine power and weight require longer shaft outboards for better balance. However, youll notice a little increase in drag and a decrease in top-end performance. bracket forward with a straight edge to where you can then measure up Raising an outboard higher on the transom can reduce drag and raise top speed. #2. This email address is being protected from spambots. In extremes, the engine can have overheating problems if the boat is raised to a point where the water inlets for the cooling system are out of the water. There are instances where a lower mount may be okay. The boat transom can be flat with zero degree angles. Allowing the propeller to pull water from underneath and push it out behind the boat. 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}'); (127 mm). You reply, "Im not sure, I think its a long". If youre looking for a bracket that can handle motors of up to 10/15 horsepower, go no further. Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. enableMoreInfoLink: true, Anything bigger than that your obviously going to need an extra long shaft. The faster your boat, the more critical it is to get the sizing just right. Oftentimes you will want to adjust the outboard shaft length in order to improve the boat performance such as speed. Then finally test your outboard, if the mount is perfect. want to measure from the transom to the flat part of this bracket, Engine Oil Mixing Ratio Fuel 50: Engine Oil 1. Place the bracket on the transom to the left of the main outboard or rudder. displayMicroOffers: false, priceSelector: ".price--withoutTax, span.price.price--withTax", Higher mounting decisions should be left to the professionals. How do you measure a transom on an outboard motor? With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. Mounting the outboard motor in accordance with the industry standards is important. With the long side (22 1/2), place a carpenters square ) in opposition to the keel. maxAmount: 6500.0, This will be the Boat Transom Heights The Beginners Guide, Buying a boat can be an exciting purchase. Cavitation plates are used on the bottom components of boats to help them operate better. These two measurements will give you the length of the shaft you need. This cookie is set by GDPR Cookie Consent plugin. maxMicroAmount: 0.0, Now that you have a better understanding of boat transom heights its time to take out the ruler and get the perfect measurements. 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". He is a This is somewhat similar to #2, in that you are again measuring with a document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML = ''; As a yacht designer and boater, I prefer longer shafts. bassboat can be a bit confusing at times; hopefully this will help sort Get the latest updates on new products and upcoming sales, 2023 Marine Parts Warehouse Incorporated 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. Most of the time, adding a hydrofoil to an outboard improves performance. mpeSelector: ".pt-mpe", Trimming in, trimming down, and trimming out are all terms that a beginning boater should learn. This allows the engine to idle without the flow of the exhaust being restricted. If the height of the boat transom is off it can cause major issues. Tightening Torque for Engine. (function () { To make the yard stick long enough to measure the length of all the clubs, tape the ruler to the top. } from the transom. Because of the increased friction, cavitation reduces efficiency. Copyright 1999-2023 Boats Group. of the motor off the transom While this is the case there is certain saltwater motors that are extra extra long at 30. To measure the transom height, measure from the center on for transom (rear of the boat). This alone can outweigh the negatives when deciding to adjust the mount upwards. There is a simple test to see if your outboard motor is set at the best height. With some boats I have a pretty good idea as to what length motor should be hung on them. Your at your local outboard dealer shopping for a new motor and the salesman hits you with the question, "short or long shaft?". Outboards designed for saltwater applications usually have longer shafts. Step 2: Three Variables to Consider motor brackets Picking the right shaft length for your outboard is an essential step in getting the best performance from your boat. However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. In the second photo, we've measure down from the top of the Detwiler Its still smart to measure it yourself though, just in case, the design changed over the years. var xmlHttp = new XMLHttpRequest(); (We wont go into name-calling here, but the actual term for the cavitation plate is an anti-ventilation plate.) So from there, I will try to help out by asking questions about your boat such as what type it is and the length. Necessary cookies are absolutely essential for the website to function properly. Other boats that need short shafts are: A: If you have a small boat with a 18 to 21 inch aft transom, youll most likely need a long shaft outboard. Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. The transom is the "back wall" of your boat, the most rearward part of your hull. Knowing how this can affect the overall operation of the boat is a factor to be considered. This is the dimension you'll need to know when deciding between a short shaft, long shaft or extra long shaft for your outboard motor. No one wants to have issues with a new transom or boat repairs. actually have the propshaft above the pad.). This, however, is not recommended for the beginning boater. minAmount: 300.0, Outboard Motor Shaft Length For Pontoon Boat - Survival Tech Shop function mpeInit() { hulls, such as Allisons, Bullets, Strokers, etc., this measurement could the aluminum plate on top of the transom), to the bottom of the motor When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. If you decide to make adjustments, please consult a marine engine dealer about the boatdesign. 3 0 obj (In the case of the faster If your boat planes, pay extra attention to getting the shaft length as close to perfect as possible. You can use a longer shaft than recommended and your boat will work fine. Picking the right shaft length is mostly a factor of the transom height or the back of the boat. When measuring the transom height, you should start from the hull's bottom at the boat's center line up to the top of the transom. mpeInit(); 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 vertical distance between the interior of the clamp and the cavitation plate is the shaft length specified by the outboard manufacturer. If it measures 15" or with in a inch of that you will need a short shaft outboard. 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. The cavitation plate is the horizontal surface of the lower unit immediately above the propeller. 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. It is extremely important that the boater understands the significance of the transoms height. How To Mount An Outboard Motor Properly - Start to Finish! Youll need a short shaft outboard if its 15 or less than an inch shorter. var interval = setInterval(function () { 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. On the downside, a higher mount can interfere with the boaters steering capabilities. As with anything, there are exceptions to the rule. 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. It moves an outboard up and down to optimize performance and enable a boat to venture into shallower water than it might otherwise. }) } }); })(document); This cookie is set by GDPR Cookie Consent plugin. Small motors built for sailboats might come in a unique configuration with an extremely long shaft since these are mounted higher off the water. What the relationship to the pontoons is, I couldn't say. Doing so, will put the propeller right below the boat. On the downside, a higher mount can interfere with the boaters steering capabilities. Also, the boat will be more likely to hit bottom or submerge objects such as rocks or logs. Beefier jack plates can be fitted should a boater be looking to mount an outboard with a shorter shaft than their transom demands. You also have the option to opt-out of these cookies. In step 3, add another 10 cm (4") to the previous calculation in order to develop the ideal shaft length. However, you will need an understanding of how the degrees will alter the boats usability. The motor length corresponds to the transom height of the boat, measured from the keel to gunwale at the transom. The pros and cons of properly . The cookie is used to store the user consent for the cookies in the category "Other. Triton. 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. On this type of boat, if you are in doubt, default to the longer-shafted outboard. will be to the flat part; if you measure to the bottom of the brackets Read the measurement on the transoms bottom. Again, make sure that you are measuring to the flat part of the brackets; Kicker Motor Shaft Length - This Old Boat - Lake Ontario United - Lake (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. Well, raising the outboard motor can be an easy task for you. The propellers will also have trouble reaching the water. Generally, short shaft outboards are 15 inches, long shaft outboards are 20 inches, and extra-long outboards are 25 inches. function loadScript(script) { There are 2 steps to help get a relatively accurate figure. Before we get started lets see what a boat transom is and what it does. var path = 'hr' + 'ef' + '='; The cookie is used to store the user consent for the cookies in the category "Analytics". When fighting waves from the stern, a 20-inch transom is considerably safer. Set the end of the tape on the outside edge of the taffrail at the center and measure inward to the inside edge of the taffrail. If you have a jackplate, you may have to get a bit creative in your These cookies track visitors across websites and collect information to provide customized ads. Cutting the transom down is the only legal method to utilize a short shaft engine on a tall transom. So you should just measure the height of the boats transom from the center down to the lowest point of the hull, and compare transom height with the outboard shaft length numbers. What Kind of Fuel Does Your Marine Engine Need? 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. As mentioned above, the operation of the propeller relies on the transom height. Other boats that need extra long shafts are: Read my other articles on outboard motors. MPW eBay Store - Thousands of New OEM Old Stock Parts! This, however, is not recommended for the beginning boater. Follow Westshore Marine & Leisure on Wordpress! This placement is not only recommended but it will give you the best performance compared to something that is too long or too short. 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. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Or it can have an angle degree as high as 30. The transom is the back of the boat where the motor is hung. 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. What is Transom Height? One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. Like Westshore Marine & Leisure on Facebook! If the height of the boat transom is off it can cause major issues. What is the Virtual Sundance Film Festival? So how to measure outboard shaft length? The outboard comes with mounting holes and brackets. Guide to Boat Transom Heights - Marine Parts Warehouse This is handy if youre shopping for second-hand outboards or looking to sell the one that came with your boat. Why Rebounding Is A Key Skill for Fouth Players To Learn, Tips For Attacking a Zone Defense as a Youth Basketball Team, Why This is a Big Deal for the Sports Betting Industry.
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