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Each one has a totally different effect on the boats performance. Knowing how this can affect the overall operation of the boat is a factor to be considered. The form of a boats transom varies depending on the manufacturer and model. I believe 20 to 21 inches is the optimum length for a lengthy shaft. The clamp bracket on the latest Mercury Four-Stoke-model outboards has five mounting bolt holes spaced .75 inches apart. However, there may be times when a boater strays away from these recommendations. The amount of degrees the transom leans back from vertical is known as the transom angle. The collapsing bubbles are loaded with extremely low-pressure water vapor, which causes damage to a variety of surfaces as they collapse. Happy boating! This cookie is set by GDPR Cookie Consent plugin. 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. However, you will need an understanding of how the degrees will alter the boats usability. center of the propshaft. MarinePartsMan.com also says that V6 bass-boat engines have a 20-inch shaft. The boat transom can be flat with zero degree angles. I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. MPW eBay Store - Thousands of New OEM Old Stock Parts! Although the longer outboard shaft length can lead to lower speed and more drag, the boat can push a heavier load. Remanufactured 4 Cylinder 4-Stroke Cylinder Heads, Remanufactured 6 Cylinder 4-Stroke Cylinder Heads, Trim Relays, Trim Solenoids & Sending Units, Remanufactured V6 & V8 4-Stroke Cylinder Heads, Volvo Cobra SX Bearings and Bearing Carriers, Volvo Cobra SX Driveshaft, U-Joints & Parts, Volvo Cobra SX Transom Assembly & Bellows. Use the mounting bracket on the motor to know where it will sit on the boat. You need JavaScript enabled to view it. 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. Then open up the clamp bucket. However, the shaft length for smaller boats could be long or short depending on its style, speed requirement, etc. Industry standards dictate that for short shaft engines the transom height should be 15. The mounting height of an outboard motor can impact the speed and handling characteristics of the boat. What matters is the actual measurement in the specifications, not the name. A: Any boat that has a 21 to 27 inch aft transom will need an extra long shaft outboard. Two years ago, I bought a Boston Whaler to fish off the coast. It is where the outboard is mounted, and some boat owners place the name of the boat. Its where the outboard motor is attached, and its also where some boat owners put the boats name. Read the following to get the optimal shaft length for outboard motors! Extra-long shafts are 25-inches long. With some boats I have a pretty good idea as to what length motor should be hung on them. Propshaft in
Tightening Torque for Engine. 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. You
The boater must also consider if the boat transom support is designed to bear the weight of a higher mount. All boats are different, and the motor manufacturers produce a variety of standard lengths. Or measure from the main engine prop up to the water line? Safely but briskly accelerate. s.setAttribute("src", script); jackplate to a point level with the top of the transom. Take your time and understand your boat and your entire transom. I also love helping others, which is why I created this website. enableMoreInfoLink: true, One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. Other boats that need long shafts are. 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. 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. If you decide to make adjustments, please consult a marine engine dealer about the boat design. 5/rC,aQhsK@Q. His works have appeared in regional newspapers in North Dakota and in "North Dakota Horizons" and "Cowboys and Indians" magazines. When the boat transom is too low, the motor could end up underwater. }) } }); })(document); former editor at Boating Magazine and contributor to many national publications 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 twin-engine setup, then measure the same distance from each clamping plate to the bottom of the hull. How Transom Height Is Measured trimming the motor out by one-half to full trim.
Having the cavitation plate too low will cause excess drag and reduced performance at high speeds. To achieve this, the motor itself has to be attached at the correct height. actually have the propshaft above the pad.). And thats usually the case since the electric outboards are designed with larger and more efficient propeller that needs longer shaft. The outboard comes with mounting holes and brackets. He is a What Kind of Fuel Does Your Marine Engine Need? A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. Check out the Westshore Marine & Leisure Youtube page! If the height of the boat transom is off it can cause major issues. What types of boat need an extra long shaft? Here we look at the effects of standard, lower and higher mounting. There is a simple test to see if your outboard motor is set at the best height. 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. The transom is the boats flat vertical part at the back. 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. These cookies will be stored in your browser only with your consent. Cavitation plates are used on the bottom components of boats to help them operate better. To make the yard stick long enough to measure the length of all the clubs, tape the ruler to the top. Boat transom angles play a pivotal role in the flexibility of the boats trimming abilities. You must be still in the blue about that matter. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Offshore vessels are often equipped with a large mounting bracket so that the transom can be left at full height. 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). Before we start measuring the outboard shaft length, lets get it clear about whats referring to when we talk about the outboard shaft length. function mpeInit() { Increased RPM and additional horsepower feed the need for speed. not sure that it's still used. displayMicroOffers: false, No one wants to have issues with a new transom or boat repairs. I run a 9.9 Mercury Bigfoot 20" shaft off the swim platform of my 89 Trophy 2160. 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 center is the point where your outboard motor is (ideally) located. 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. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. You reply, "Im not sure, I think its a long". A: The short answer is Yes. In the photo above, we've measured from the motor bracket to the top of
Actual shaft length is 21.5" on those. 12 Small Fishing Boat Accessories to Buy Today. boats.com is part of the Boats Group Network. 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. Also, how do you determine the length of an outboard transom? If you decide to make adjustments, please consult a marine engine dealer about the boatdesign. Long shafts are 20-inches long. When fighting waves from the stern, a 20-inch transom is considerably safer. Measure from the top of the transom to the bottom of the hull. To do so, take a measurement from the very top to the very bottom of the transom in the precise center. xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); Copyright 2017 Dealer Spike All Rights Reserved. The propellers will also have trouble reaching the water. and I'll explain it better, (or point you to someone that can help. (127 mm). Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. gtag('config', 'G-QX0Y76NH40'); Whether your on a pontoon boat, fishing boat, or speedboat boating is always one of the best times you can have. The standard shaft length for most outboard engines less than 125 horsepower is 20 inches. If you went too long it would still work but it may lack in performance. If so, send me an
Outboards designed for saltwater applications usually have longer shafts. 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. This allows the engine to idle without the flow of the exhaust being restricted. You also have the option to opt-out of these cookies. Again, make sure that you are measuring to the flat part of the brackets;
These cookies ensure basic functionalities and security features of the website, anonymously. 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". This will be the
All things considered, sticking with the industry standard is best for the beginner. Amazon has plate extensions to allow adjustments without buying a new motor: T-H Marine Jack Plate Extension. 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. Like Westshore Marine & Leisure on Facebook! Copyright 1999-2023 Boats Group. To do so, measure from the stern (back) of the boat to the midpoint of the hull on both sides. Tilt your motor until the bullet of the gearcase is
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. On the downside, a higher mount can interfere with the boaters steering capabilities. It also cuts into speed and fuel efficiency. Raising an outboard higher on the transom can reduce drag and raise top speed. 2 0 obj
I hope this helps someone out in their search for a new or newer outboard this season. function gtag(){dataLayer.push(arguments);} your motor will be higher.) Because of the increased friction, cavitation reduces efficiency. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. 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. motor brackets
Pad to bottom of
The prop will be in cleaner, harder water as it advances farther aft, making it more efficient. up to the bottom of the motor brackets, (as in #1). ), and place it on the bottom of the pad in the center. storeDisplayName: "Marine Parts Warehouse", Theyre also useful if the back of your boat has a non-standard measurement. As summer approaches there will be more boaters taking to the water. As a result, the issue is whether my boat need a short shaft or long shaft motor. of the "bullet" on your lower unit. The clamp bracket is designed so that the engine's mounting height on the transom can be adjusted higher than standard. Keith Allen, a 1979 graduate of Valley City State College, has worked at a variety of jobs including computer operator, medical clinic manager, radio talk show host and potato sorter. This illustration depicts four different outboard mounting height options (courtesy Mercury Marine). Always weigh the risks of making adjustments. The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". The first order of business is to measure your boat for the ideal fit. If you decide to make some custom adjustments we have theexperience and know-howto make it happen. 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. https:/. It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. Necessary cookies are absolutely essential for the website to function properly. Buying a boat can be an exciting purchase. How high exactly do you have to raise the transom?-. Among them will be first-timers or those who have recently purchased their boats. Higher mounting decisions should be left to the professionals. var xmlHttp = new XMLHttpRequest(); This measurement was approximately 4". Step 2: After you get the transom height, add the radius of the propeller (check the user manual, and then technical drawing for the number) to calculate the minimum shaft length needed to make it work. Raising the motor increases the speed of the boat while decreasing the effort needed to turn 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. 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 the powerboat, planing boat, or any boat for which the speed is the priority, take the outboard shaft length 1 to 1.5 (depending on your boat types) shorter than standard would be better. Add yours in the comment and Ill get back to you asap. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. *The Factors indicates the adjustment affected by on your boat type, the outboard working environment, and the transom distance as discussed above. This alone can outweigh the negatives when deciding to adjust the mount upwards. Rebuilt - What You Need to Know, Lower Unit and Sterndrive Break-In Instructions. For slower boats, its less critical to. There are 2 steps to help get a relatively accurate figure. endobj
If it measures between 17 and 22, youll want to go with a long shaft motor. Expectedly, when the transom angle is zero, it means it is flat. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
However, there may be times when a boater strays away from these recommendations. 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. What is Transom Height? logoColor: "original", Or it can have an angle degree as high as 30. function loadScript(script) { Boaters who consider going with a higher mount can see increased speeds. What's the best height for my boat motor? 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. addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; This alone can outweigh the negatives when deciding to adjust the mount upwards. Extra-extra long shafts are 30-inches long. Make sure that you are measuring straight up, at a 90 degree angle to
window.dataLayer = window.dataLayer || []; Whats the best height for my boat motor? Using your existing control box and gauges will save you quite a bit of money in the end. Save my name, email, and website in this browser for the next time I comment.