It varies between different motors and boats. Mounting the motor lower on the boat transom can create excessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. These cookies will be stored in your browser only with your consent. maxAmount: 6500.0, Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Step 2: Three Variables to Consider Take your time and understand your boat and your entire transom. 7. The cookie is used to store the user consent for the cookies in the category "Analytics". As mentioned above, the operation of the propeller relies on the transom height. Many boat transoms are modified to use a different length of outboard by using a bracket. If the propeller fails to ventilate, the motor is mounted to low. storeDisplayName: "Marine Parts Warehouse", All boats are different, and the motor manufacturers produce a variety of standard lengths. since 1986. Lastly, knowing the year of your motor and what style of controls you have (side mount, concealed side mount, or binnacle) is also a plus because it will tell the dealer if your current controls are compatible with the motor you are purchasing. All you need to do is measure how much to rise. Yes, if there is adequate space while the engine is tilted in the up position, a larger shaft length than what is specified may be used. motor brackets Buying a boat can be an exciting purchase. The motor is what powers the boat so the two go hand-in-hand. (Any measurement given as "off the transom" Then open up the clamp bucket. How to Find Your Shaft Length | ePropulsion Outboard shaft length plays a crucial role in the performance of your boat. Offshore vessels are often equipped with a large mounting bracket so that the transom can be left at full height. A: The answer varies by boat, but here are some rules of thumb for matching a short shaft outboard to your boat. If you are running a slower boat, the exact location of the ventilation plate is less important. 3 0 obj When you measure the width of the stern, mark the center with a grease pencil. This email address is being protected from spambots. By clicking Accept, you consent to the use of ALL the cookies. primeApr: 12.99, If you went too long it would still work but it may lack in performance. window.dataLayer = window.dataLayer || []; This placement is not only recommended but it will give you the best performance compared to something that is too long or too short. Tilt your motor until the bullet of the gearcase is Safely but briskly accelerate. debugMode: false, Repowering your boat is one of the most expensive upgrades you can make. It can also improve the experience of driving a faster boat. This illustration depicts four different outboard mounting height options (courtesy Mercury Marine). If you decide to make adjustments, please consult a marine engine dealer about the boatdesign. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. Place the bracket on the transom to the left of the main outboard or rudder. 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. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. The current measurement is the ventilation plate is about 1 1/2" above the true keel line which is about 24" in front of the motor edge. % Sailboats use these sometimes, as well as some boaters who want to install a much smaller auxiliary motor to use in case of primary engine failure. This is handy if youre shopping for second-hand outboards or looking to sell the one that came with your boat. An inch or two probably wont make a big difference, but any more than that will lead to trouble. 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. How to Choose Between a Motor Tote and Transom Saver to Support an However, you will need an understanding of how the degrees will alter the boats usability. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. 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. %PDF-1.7 Transom Outboard Engine Position - YouTube Beginning boaters should be aware of the boats measurements. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. Measure from the top of the transom to the bottom of the hull. What the relationship to the pontoons is, I couldn't say. | Sitemap, The Marine Parts Warehouse Outboard Museum, OBR Powerhead / Shortblock Warranty Claim Form, Remanufactured vs. For really big boats, the biggest and baddest six- or eight-cylinder outboards can have extra-extra long shafts up to 30 inches. There are instances where a lower mount may be okay. Increased RPM and additional horsepower feed the need for speed. Boaters who consider going with a higher mount can see increased speeds. If you are running a twin-engine setup, then measure the same distance from each clamping plate to the bottom of the hull. Commonly, the transom angle ranges from 0-30 degrees, with the average transom angle set at 14 degrees. (3) Move horizontally across the chart until you hit the graph curve. 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. 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). I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. Depending on the manufacturer, size names might change. 2 0 obj Among them will be first-timers or those who have recently purchased their boats. Raising an outboard higher on the transom can reduce drag and raise top speed. straight edge on the top of the transom to "extend" it out The point where these measurements intersect is your centerline. Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. With some boats I have a pretty good idea as to what length motor should be hung on them. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. The cavitation plate is the horizontal surface of the lower unit immediately above the propeller. maxTerm: 36, Two years ago, I bought a Boston Whaler to fish off the coast. You also might not be able to lift the outboard out of the water entirely for storage. 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. Assistant Measuring tape Grease pencil Ask a friend to hold one end of a measuring tape at the extreme outer edge of the top of the transom while you pull the tape across its width to the opposite outer edge to measure the "length of the taffrail," which is the width of the boat across the top edge of the stern. Whether you already own a boat or looking for your first watercraft we are here to service your needs. If the propeller fails to ventilate, the motor is mounted to low. 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. Which Navigation Lights Does Your Boat Need? It also decreases the boats lift and increases the time it takes for the boat to reach plane. trimming the motor out by one-half to full trim. Lubrication System Engine Oil Mixed Gasoline. Or it can have an angle degree as high as 30. It does not store any personal data. displayPrimeOffers: true, Necessary cookies are absolutely essential for the website to function properly. There are also specialty motor shaft lengths. Measuring Motor Height - BassBoat Central The first step is to determine the height of your boat's transom. 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. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Measure from the top of the transom to the bottom of the hull. var prefix = 'ma' + 'il' + 'to'; Then, you can pick the right engine. See When St. Peters Basketball Games Are Today! Youll also want to pay attention when youre in shallow water because your prop will be lower than normal. Always weigh the risks of making adjustments. This, however, is not recommended for the beginning boater. This cookie is set by GDPR Cookie Consent plugin. Keep these numbers in mind if you ever have a need for a new outboard motor for your boat. The transom is the flat vertical section at the rear of the boat. 1 0 obj 7. How high exactly do you have to raise the transom?- - Outboard Jets To measure your outboard motor shaft length, measure from the bottom of the mounting bracket where it rests on the transom to the top of the cavitation plate, this is the horizontal surface of the lower unit immediately above the propeller. not sure that it's still used. With this in mind, how can I determine if my outboard has a short or long shaft? The height is approximately six inches higher than with a propeller. 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. Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. How to Measure a Boat Transom - Gone Outdoors Its where the outboard motor is attached, and its also where some boat owners put the boats name. var h = d.getElementsByTagName("head"), I hope this helps someone out in their search for a new or newer outboard this season. The distance between the ends of a transom is measured in inches. Before we start measuring the outboard shaft length, lets get it clear about whats referring to when we talk about the outboard shaft length. In the case of a larger offshore boat, it may be to the top of a cutout on the . #2. 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. }, 100); 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. PDF Outboard shaft lengths and transoms - Boat Builder Central It is extremely important that the boater understands the significance of the transom's height. 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. There are instances where a lower mount may be okay. If you have a question or need additional information. The motor is what powers the boat so the two go hand-in-hand.
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