C Cheaptoon Cadet Joined Aug 4, 2010 Messages 28 Aug 24, 2010 #4 Re: Motor height on pontoon? Another important measurement is the transom angle. The first order of business is to measure your boat for the ideal fit. Hold the tape on the top, center of the taffrail and measure straight down to the point, usually a sharp angle, where the transom joins the bottom of the boat. 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. var BCData = {"csrf_token":"d7ecb6b56891bb66aee12dbc01a80162b3ed582c1acbe30f16fc9f1b2abc362f"}; 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". function mpeInit() { In the past, though, it housed the officers and captain of 17th, 18th and 19th century sailing ships. Boaters who consider going with a higher mount can see increased speeds. The average transom angle is around 14 degrees. This measurement would be the inches of Ill also explain the difference between short and long shafts and how they vary by type of boat. What the relationship to the pontoons is, I couldn't say. This, however, is not recommended for the beginning boater. Tilt your motor until the bullet of the gearcase is ), and place it on the bottom of the pad in the center. But opting out of some of these cookies may affect your browsing experience. It is where the outboard is mounted, and some boat owners place the name of the boat. Gear case sits just below or at the hull depth due to the deep v. Read the measurement on the transoms bottom. (We wont go into name-calling here, but the actual term for the cavitation plate is an anti-ventilation plate.) Be sure to measure carefully and research thoroughly before diving in. An inch or two probably wont make a big difference, but any more than that will lead to trouble. This illustration depicts four different outboard mounting height options (courtesy Mercury Marine). 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. var interval = setInterval(function () { In lower mounting, the engine is set lower than the recommended standard. up to the bottom of the motor brackets, (as in #1). actually have the propshaft above the pad.). Cavitation plates are used on the bottom components of boats to help them operate better. Outboard Motor Shaft Length: How do I measure? I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. priceSelector: ".price--withoutTax, span.price.price--withTax", You The transom is the flat vertical section at the rear of the boat. 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. would be more accurate.) 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. If you are looking to repower, they may be able to offer some sage advice. 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. Copyright 2017 Dealer Spike All Rights Reserved. Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. Shaft lengths are available in increments of 5. If so, send me an 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). Buying a boat can be an exciting purchase. 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. 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. You also might not be able to lift the outboard out of the water entirely for storage. parallel with the straight edge. Some fishing boats can handle the motor being underwater. However, your boat will have slightly more drag which will reduce your maximum speed. 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. Most of the time, adding a hydrofoil to an outboard improves performance. This cookie is set by GDPR Cookie Consent plugin. enableMoreInfoLink: true, former editor at Boating Magazine and contributor to many national publications 3 0 obj e-mail When the boat transom is too low, the motor could end up underwater. You can order an outboard in lengths ranging from 15 inches to 30 inches, depending on its power output and possible uses. 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. bracket. Owners of bass boats, RIBs, or offshore fishing boats need to get this right. MPW eBay Store - Thousands of New OEM Old Stock Parts! Add yours in the comment and Ill get back to you asap. Also, the boat will be more likely to hit bottom or submerge objects such as rocks or logs. Finding the right size is a matter of looking at what youve got and taking out the measuring tape. Boats that use longer outboard shafts include: The motor is what powers the boat so the two go hand-in-hand. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. It is extremely important that the boater understands the significance of the transom's height. Actually there is no designated letter for short shaft. If you decide to make some custom adjustments we have theexperience and know-howto make it happen. Follow Westshore Marine & Leisure on Twitter! To do so, measure from the stern (back) of the boat to the midpoint of the hull on both sides. Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. See When St. Peters Basketball Games Are Today! "brackets". Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. Before we start measuring the outboard shaft length, lets get it clear about whats referring to when we talk about the outboard shaft length. When trimming your motor, they provide you a greater bow response. ), Al Shields Beginning boaters should be aware of the boats measurements. 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. Chances are the boat was designed with a specific size of outboard in mind. Propshaft in measuring; you may have to "extend" the flat part of the Safely but briskly accelerate. The standard installation of an outboard has the top of the transom of the boat at the same level as the bottom of the motor portion of the outboard. For most boaters this is a no brainer, but for the novice or inexperienced boater it may be a tougher question. Measuring the shaft length can be done in various ways, but the most common way is by using a tape measure. A hydrofoil will typically level off the ride by driving the stern up and the bow down, and will stop or considerably minimize porposing on a 16 footer with a mid-sized outboard and no tabs, for example. With it comes a lot of responsibility and new things to learn includingboat maintenanceand boat basics. maxAmount: 6500.0, These two measurements will give you the length of the shaft you need. What are Apple Podcasts Subscriptions and Channels? AztH ^zv_ cT,E1K/rAB54| storeDisplayName: "Marine Parts Warehouse", For slower boats, its less critical to. %PDF-1.7 The clamp bracket is designed so that the engine's mounting height on the transom can be adjusted higher than standard. 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. It varies between different motors and boats. 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. The same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. You dont have to be a mathematician to determine the correct boat transom angle. h[0].appendChild(s); There are 2 steps to help get a relatively accurate figure. All boats are different, and the motor manufacturers produce a variety of standard lengths. function loadScript(script) { Re: Dinghy with a long shaft motor? 5/rC,aQhsK@Q. August 9/08). Place the rulers end on the ground behind the club and let the club to rest on top of it. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. Oftentimes you will want to adjust the outboard shaft length in order to improve the boat performance such as speed. 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. Why wont Touch ID be under the screen in the iPhone 15 and iPhone 16? Remember, if you use a longer outboard shaft than you need you will be increasing your draft. |. On the downside, a higher mount can interfere with the boaters steering capabilities. The transom is the back of the boat where the motor is hung. In the photo above, we've measured from the motor bracket to the top of Whats the best height for my boat motor? since 1986. 4 0 obj your motor will be higher.) the aluminum plate on top of the transom), to the bottom of the motor Other factors to consider when determining the mounting height of an outboard are related to performance. How high exactly do you have to raise the transom?-. Adjusting the mounting height of an outboard on the boat transom can affect performance and every boat can be different, so actual on-water testing is best. Some outboards have a serial number that tells you which shaft length to go for. Eq*^?6R83e+j}UY.(M7k]~4g)g ~wmS{ O7t/o(W|X? Attention: Remember to measure the outboard shaft length straight up and down instead of measuring along the transom. And thats usually the case since the electric outboards are designed with larger and more efficient propeller that needs longer shaft. Amazon has plate extensions to allow adjustments without buying a new motor: T-H Marine Jack Plate Extension. The point where these measurements intersect is your centerline. If you have a jackplate, you may have to get a bit creative in your addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; The collapsing bubbles are loaded with extremely low-pressure water vapor, which causes damage to a variety of surfaces as they collapse. Anything bigger than that your obviously going to need an extra long shaft. Other boats that need long shafts are. Outboards designed for saltwater applications usually have longer shafts. var h = d.getElementsByTagName("head"), All things considered, sticking with the industry standard is best for the beginner. bassboat can be a bit confusing at times; hopefully this will help sort logoColor: "original", var xmlHttp = new XMLHttpRequest(); While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. Long shafts are 20-inches long. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. endobj With this in mind, how can I determine if my outboard has a short or long shaft? 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. 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. Increased RPM and additional horsepower feed the need for speed. The transom is the "back wall" of your boat, the most rearward part of your hull. 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.
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