Simply start with the engine in idle, followed bytrimming the motor out by one-half to full trim. 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. parallel with the straight edge. (127 mm). var addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = 'info' + '@'; How to Measure Transom Height For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. Selecting the Correct Size Outboard Shaft, What is the Best Outboard Motor for Saltwater, Diagnosing Common Outboard Motor Problems, Best Beginner Boats Everything You Need to Know. The motor length corresponds to the transom height of the boat, measured from the keel to gunwale at the transom. Here we look at the effects of standard, lower and higher mounting. When trimming your motor, they provide you a greater bow response. Anything bigger than that your obviously going to need an extra long shaft. Read the following to get the optimal shaft length for outboard motors! steel ruler, etc. window.dataLayer = window.dataLayer || []; of the motor off the transom <> (Putting a not sure that it's still used. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. maxTerm: 36, Read the measurement on the transoms bottom. 4 0 obj You reply, "Im not sure, I think its a long". This restriction includes most fishing boats and longer sailboats. You'll need a short shaft outboard if it's 15 or less than an inch shorter. Wherever the outboard clamping bracket is, use this as the basis for measurement. Triton. An inch or two probably wont make a big difference, but any more than that will lead to trouble. up to the bottom of the motor brackets, (as in #1). You can order an outboard in lengths ranging from 15 inches to 30 inches, depending on its power output and possible uses. A1: Broadly speaking, the outboard motor shaft length for pontoon boat, bass boat, or other larger boats should be long shaft. Get the latest updates on new products and upcoming sales, 2023 Marine Parts Warehouse Incorporated To achieve this, the motor itself has to be attached at the correct height. e-mail ), and place it on the bottom of the pad in the center. The boater must also consider if the boat transom support is designed to bear the weight of a higher mount. 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 short shaft motor, the distance between the top of the transom and the bottom of the boat should be between 15 and 16 inches. }, 100); What's the best height for my boat motor? document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML = ''; disregard the downward pointing "hooks" at the front of the The transom is the rear wall of the boat where the outboard engine is mounted in the middle. As summer approaches there will be more boaters taking to the water. Now that you have a better understanding of boat transom heights its time to take out the ruler and get the perfect measurements. I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. There This will be the 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. Say the 20 shaft is a long shaft length for gas engines, but it is a short shaft length for electric outboard motors. Ten years ago I bought my first boat. Workboats, sailboats, and displacement-hulled boats fall into this category. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. It can also improve the experience of driving a faster boat. The center is the point where your outboard motor is (ideally) located. Determining Your Boat Transom Angle The transom angle - commonly measured in degrees - is the transom's vertical inclination. %PDF-1.7 As with anything, there are exceptions to the rule. A big NO. With the long side (22 1/2), place a carpenters square ) in opposition to the keel. If so, send me an The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". So how to measure outboard shaft length? Trimming in, trimming down, and trimming out are all terms that a beginning boater should learn. 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. The propellers will also have trouble reaching the water. All you need to do is measure how much to rise. Buying a boat can be an exciting purchase. What Types of Documents Can be Sent to your Kindle Library? Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. Boats with more engine power and weight require longer shaft outboards for better balance. 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. Beginning boaters should be aware of the boats measurements. When fighting waves from the stern, a 20-inch transom is considerably safer. Mounting the outboard motor in accordance with the industry standards is important. Like Westshore Marine & Leisure on Facebook! } Since the ventilation plate & foil are burried under water it is obviously too low. High powered boats usually only come in long and extra-long variants. How Transom Height Is Measured Look at the part of your motor that would be It varies between different motors and boats. Boaters who consider going with a higher mount can see increased speeds. Eq*^?6R83e+j}UY.(M7k]~4g)g ~wmS{ O7t/o(W|X? As mentioned above, the operation of the propeller relies on the transom height. Variables to consider when determining the mounting height include the size and style of the boat and the length of the outboard motor's shaft. Take the center measurement from the top to the bottom of the hull. Whats the best height for my boat motor? Whether you already own a boat or looking for your first watercraft we are here to service your needs. To measure the transom height, measure from the center on for transom (rear of the boat). Check out the full chart of the Mercury outboard model code and its features. See When St. Peters Basketball Games Are Today! Save my name, email, and website in this browser for the next time I comment. Again, make sure that you are measuring to the flat part of the brackets; ), Al Shields When the right length motor is hung on the transom of a boat, the cavitation plate (the large plate that extends out over the propeller) should be even with the very bottom of the boat. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. What the relationship to the pontoons is, I couldn't say. maxAmount: 6500.0, Although the longer outboard shaft length can lead to lower speed and more drag, the boat can push a heavier load. The boater must also consider if the boat transomsupport is designed to bear the weight of a higher mount. In the case of a dinghy or johnboat, this point may be the top of the transom. *The Factors indicates the adjustment affected by on your boat type, the outboard working environment, and the transom distance as discussed above. out the confusion. All things considered, sticking with the industry standard is best for the beginner. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. Cavitation is when the propeller is out of the water due to the boat forming a wake of "air bubbles" or "vapor cavities" around the prop. 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. The transom is the boats flat vertical part at the back. A: The short answer is Yes. Using your existing control box and gauges will save you quite a bit of money in the end. var addy_textd53b59933f6c3f2e8b59f1b4a6d41fa5 = 'info' + '@' + 'vanssports' + '.' + 'com';document.getElementById('cloakd53b59933f6c3f2e8b59f1b4a6d41fa5').innerHTML += ''+addy_textd53b59933f6c3f2e8b59f1b4a6d41fa5+'<\/a>'; It is unsafe to have the engine block too close to the water on a low transom. I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. This is a measurement that has been used for BassCats, I'm For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. A: The answer varies by boat, but here are some rules of thumb for matching a short shaft outboard to your boat. Next, measure from your centerline to where the outboard will be mounted on each side. This email address is being protected from spambots. Depending on the manufacturer, size names might change. actually have the propshaft above the pad.). maxMicroAmount: 0.0, Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. (In the case of the faster I would ask you to go back and measure the transom of your boat. This would not be a good thing. It also cuts into speed and fuel efficiency. Add yours in the comment and Ill get back to you asap. And thats usually the case since the electric outboards are designed with larger and more efficient propeller that needs longer shaft. function loadScript(script) { Other boats that need extra long shafts are: Read my other articles on outboard motors. All rights reserved. This could also effect your travelling capabilities on the boat trailer. Not to measure boat speed, but to gauge the mounting height of the outboard motor on the boat transom. 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. Its important to note that manufacturers call their models different things. When the boattransom is too low, the motor could end up underwater. Smaller boats may use adjustable jack plates that can be changed to fit any outboard. Place the bracket on the transom to the left of the main outboard or rudder. To break it down a bit more for you: Short shafts are 15-inches long. Raising an outboard higher on the transom can reduce drag and raise top speed. 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. If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. ensure that your measurement is accurate. The transom is the flat vertical section at the rear of the boat. Here we will guide you in how to get the right boat transom height. Here we will guide you in how to get the right boat transom height. 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. 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. 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. Measure from the top of the transom to the bottom of the hull. He is also a certified marine technician and the author of a popular text on writing local history. I mean it is better to be safe than sorry, am I right? If you have a question or need additional information,contact ustoday. MPW eBay Store - Thousands of New OEM Old Stock Parts! With some boats I have a pretty good idea as to what length motor should be hung on them. As a result, the issue is whether my boat need a short shaft or long shaft motor. What is Transom Height? If the height of the boat transom is off it can cause major issues. (function (d) { Always weigh the risks of making adjustments. Some fishing boats can handle the motor being underwater. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. Smaller 12-14 foot boats can require either a short or long shaft outboard depending on the style of the boat and the brand. 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. At least if its too long you can raise the motor or "build up" your transom. 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). For most boaters this is a no brainer, but for the novice or inexperienced boater it may be a tougher question. It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. Beginning boaters should be aware of the boats measurements. The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline. Spark Plug 25.0nm(18.4 Ft-lb) (2.55 Kgf-m) There is a simple test to see if your outboard motor is set at the best height. This placement is not only recommended but it will give you the best performance compared to something that is too long or too short. Always weigh the risks of making adjustments. The cookies is used to store the user consent for the cookies in the category "Necessary". Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. Measure from the top of the straight edge to the center of the front Oftentimes you will want to adjust the outboard shaft length in order to improve the boat performance such as speed. boats.com, 1221 Brickell Avenue, 23rd Floor, Miami, FL 33131, USA. As with anything, there are exceptions to the rule. The transom angle is the vertical incline of the transom and is measured in degrees. But in many cases, its a little more complicated than that alone. However, the motor should not be raised more than 5 inches above the standard position. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. (3) Move horizontally across the chart until you hit the graph curve. Recommended Engine Oil 2-Stroke Outboard Motor Oil. 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. height (that I'm aware of); probably the most common is: Extra-extra long shafts are 30-inches long. The mounting height of the outboard engine is the equivalent of the distance between the base of the motor and the top of the propeller. minAmount: 300.0, If you decide to make some custom adjustments we have theexperience and know-howto make it happen. This allows the engine to idle without the flow of the exhaust being restricted. Remember, if you use a longer outboard shaft than you need you will be increasing your draft. In the photo above, we've measured from the motor bracket to the top of Youll need a short shaft outboard if its 15 or less than an inch shorter. These cookies track visitors across websites and collect information to provide customized ads. Repowering your boat is one of the most expensive upgrades you can make. As mentioned above, the operation of the propeller relies on the transom height. Theyre also useful if the back of your boat has a non-standard measurement. Gear Oil Quantity 195ml(6.6 Fl.oz.) You run the risk of possibly unsafe handling if you attempt to put a long shaft engine on a transom designed for a short shaft engine. 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. For boats equipped with a bracket, calculate the same measurement but based on the bracket and not the transom. This alone can outweigh the negatives when deciding to adjust the mount upwards. Also, how do you determine the length of an outboard transom? xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Each one has a totally different effect on the boats performance. addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; Raising the motor increases the speed of the boat while decreasing the effort needed to turn the boat. loadScript(ptScript); You also have the option to opt-out of these cookies. Disclaimer: As an affiliate I may earn a commission on any qualifying purchases, including those from Amazon.com, at no extra cost to you read more. Pretty easy to figure out but like I said its crucial to pairing a motor with a boat. Higher mounting decisions should be left to the professionals. You may wonder how deep your prop should be in the water. If you have a question or need additional information. Then finally test your outboard, if the mount is perfect. <> 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? Bass boats, ski boats, or center cockpit vessels will want to double-check their measurements to get it just right. Re: Dinghy with a long shaft motor? storeDisplayName: "Marine Parts Warehouse", <>/Metadata 127 0 R/ViewerPreferences 128 0 R>> 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. One of the great things about an outboard motor is how versatile it is. 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? When the boat transom is too low, the motor could end up underwater. 1 0 obj The cookie is used to store the user consent for the cookies in the category "Analytics". debugMode: false, The Effects of Standard, Lower and Higher Mounting. I live for the weekends when I can go out on the water and escape the stress of life on land. var path = 'hr' + 'ef' + '='; Picking the right shaft length for your outboard is an essential step in getting the best performance from your boat. A deep Vee hull will result in a different measurement than a flatter . However, you will need an understanding of how the degrees will alter the boats usability.

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