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To achieve this, the motor itself has to be attached at the correct height. Workboats, sailboats, and displacement-hulled boats fall into this category. How to Measure Transom Height For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. All things considered, sticking with the industry standard is best for the beginner. 1 0 obj
C Cheaptoon Cadet Joined Aug 4, 2010 Messages 28 Aug 24, 2010 #4 Re: Motor height on pontoon? While this is the case there is certain saltwater motors that are extra extra long at 30. function mpeInit() {
Yamaha Outboard Motors: How To Measure Leg Length In the second photo, we've measure down from the top of the Detwiler
If you have a jackplate, you may have to get a bit creative in your
Trimming in, trimming down, and trimming out are all terms that a beginning boater should learn. 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. The height of the boat transom dictates the size of the outboard motor. Smaller boats may use adjustable jack plates that can be changed to fit any outboard. But in many cases, its a little more complicated than that alone. Commonly, the transom angle ranges from 0-30 degrees, with the average transom angle set at 14 degrees. The transom is the "back wall" of your boat, the most rearward part of your hull. Generally, the anti-ventilation plate on most engines is aligned with the bottom of the vessel. What is the Virtual Sundance Film Festival? %PDF-1.7
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. It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. Next, measure from your centerline to where the outboard will be mounted on each side. A: Any boat that has a 21 to 27 inch aft transom will need an extra long shaft outboard.
Mounting kicker motor - General Discussion Forum | In-Depth Outdoors As mentioned above, the operation of the propeller relies on the transom height. The general guideline for longer shaft outboards is that the transom height should be at least 20 inches (50,8cm) above the waterline.
How-To: Pick A Great Portable Outboard Motor (2023 Guide) <>/Metadata 127 0 R/ViewerPreferences 128 0 R>>
Determining Your Boat Transom Angle The transom angle - commonly measured in degrees - is the transom's vertical inclination. Outboard shaft length plays a crucial role in the performance of your boat. 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. Save my name, email, and website in this browser for the next time I comment. This could also effect your travelling capabilities on the boat trailer. Copyright 1999-2023 Boats Group. The first step is to determine the height of your boat's transom. want to measure from the transom to the flat part of this bracket,
This measurement was approximately 4". Add yours in the comment and Ill get back to you asap. This will be the
function gtag(){dataLayer.push(arguments);} 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. The boat transom can be flat with zero degree angles. What is Transom Height? Cutting the transom down is the only legal method to utilize a short shaft engine on a tall transom. If your outboard motor height. Industry standards dictate that for short shaft engines the transom height should be 15. It was a 23-foot Crestliner Grand Cayman pontoon boat. Industry transom height standards have been evolved during the last 30 years: 15 for short shaft engines, 20 for long shaft engines, and 25 for extra-long shaft engines. Analytical cookies are used to understand how visitors interact with the website. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. endobj
While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. If the propeller fails to ventilate, the motor is mounted to low. Outboards designed for saltwater applications usually have longer shafts. 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. As with anything, there are exceptions to the rule. There are 2 steps to help get a relatively accurate figure. 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. displayMicroOffers: false, Place the clubs bottom on the ground as though it were going to be used to strike a golf ball. Check out the Westshore Marine & Leisure Youtube page! If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor.
What Is a Transom? Where Onboard a Boat is It Located? brackets. Engine Oil Mixing Ratio Fuel 50: Engine Oil 1.
Boat Transom Heights - The Beginner's Guide | My Westshore When the jet drive is on the motor, set the height so that the leading edge of the intake is flush with the boat bottom. Since the ventilation plate & foil are burried under water it is obviously too low. 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? Many boat transoms are modified to use a different length of outboard by using a bracket. Chances are the boat was designed with a specific size of outboard in mind. Remember, if you use a longer outboard shaft than you need you will be increasing your draft. The how to measure the shaft length of an outboard motor is a question that many people have asked. Outboard Motor Shaft Length: How do I measure? Step 2: Three Variables to Consider Place the bracket on the transom to the left of the main outboard or rudder. With such an important, long-term, and expensive upgrade, its never a bad idea to double-check. What Types of Documents Can be Sent to your Kindle Library? What Kind of Fuel Does Your Marine Engine Need? Some fishing boats can handle the motor being underwater. Owners of bass boats, RIBs, or offshore fishing boats need to get this right. When fighting waves from the stern, a 20-inch transom is considerably safer. Another important measurement is the transom angle. 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". d.addEventListener("DOMContentLoaded", function (e) { It can also improve the experience of driving a faster boat. High powered boats usually only come in long and extra-long variants. With it comes a lot of responsibility and new things to learn including boat maintenance and boat basics. If the height of the boat transom is off it can cause major issues. For over five years he has worked as a newspaper reporter and historic researcher. xmlHttp.setRequestHeader('Content-Type', 'application/json'); var ptScript = "https://cdn.paytomorrow.com/js/pt-mpe.min.js"; However, you will need an understanding of how the degrees will alter the boats usability. 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. However, the motor should not be raised more than 5 inches above the standard position. Save my name, email, and website in this browser for the next time I comment. s = d.createElement("link"); It does not store any personal data. A: The short answer is Yes. The transom is the flat vertical section at the rear of the boat. The propellers will also have trouble reaching the water. We also use third-party cookies that help us analyze and understand how you use this website. When trimming your motor, they provide you a greater bow response. logoColor: "original", gtag('js', new Date()); 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 height of the boat transom dictates the size of the outboard motor. See diagram below. 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. I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. Your at your local outboard dealer shopping for a new motor and the salesman hits you with the question, "short or long shaft?". Figuring out how to measure motor height on a
(127 mm). a Detwiler manual jackplate. Before we get started lets see what a boat transom is and what it does. Having the cavitation plate a bit lower than the transom is preferable to having it too high. 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. Beginning boaters should be aware of the boats measurements. To sum up, there is a simple calculator of the shaft length for outboard motors: Outboard Shaft Length = Transom Height +/- Factors. } Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. So you should just measure the height of the boat's transom from the center down to the lowest point of the hull, and compare transom height with the outboard shaft length numbers. The motor is what powers the boat so the two go hand-in-hand. } 7. If you said something smaller than that, thats where it can get tricky. Or measure from the main engine prop up to the water line? Step 3: Add another 10 cm (4'') to the previous calculation for the final ideal shaft length. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. How the outboard will sit on the back of the boat depends on how the transom is designed. Allowing the propeller to pull water from underneath and push it out behind the boat. 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. With it comes a lot of responsibility and new things to learn including, Why your boat transom needs to be the right height, The pros and cons of properly mounting the outboard motor to the transom, Standard mounting is always best for the beginner, Of course, its always best to go with standard practices when choosing the, Lower mounting is not for the beginning boater, Mounting the motor lower on the boat transom, There is a simple test to see if your outboard motor is set at the best height. Mounting the outboard motor in accordance with the industry standards is important. disregard the "hooks" at the front of the
Then test the boat and adjust the height, if necessary . Measure from the top of the transom to the bottom of the hull. would be more accurate.) ensure that your measurement is accurate. A transom saver, which can change the spacing between the lower unit and the trailer, negates some of the support. The transom angle is the vertical incline of the transom and is measured in degrees. Ill also explain the difference between short and long shafts and how they vary by type of boat. What types of boat need an extra long shaft?