Measuring Motor Height - BassBoat Central (3) Move horizontally across the chart until you hit the graph curve. Mounting the outboard a little bit lower than the standard point could avoid the possible ventilation and slip on acceleration. The boater must also consider if the boat transom support is designed to bear the weight of a higher mount. The vertical distance between the interior of the clamp and the cavitation plate is the shaft length specified by the outboard manufacturer. If you are running a twin-engine setup, then measure the same distance from each clamping plate to the bottom of the hull. But in many cases, its a little more complicated than that alone. Extra-long shafts are 25-inches long. When the boat transom is too low, the motor could end up underwater. I live for the weekends when I can go out on the water and escape the stress of life on land. If you are running a slower boat, the exact location of the ventilation plate is less important. Smaller inflatables and dinghies needshort shaft motors, whilst bigger boats require long or, in some circumstances, extreme long shaft versions. s.setAttribute("href", "https://cdn.paytomorrow.com/css/pt-mpe.min.css"); function loadScript(script) { Doing so, will put the propeller right below the boat. Mounting the outboard motor in accordance with the industry standards is important. 12 Small Fishing Boat Accessories to Buy Today. These cookies will be stored in your browser only with your consent. 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. In lower mounting, the engine is set lower than the recommended standard. bracket forward with a straight edge to where you can then measure up To achieve 35 mph with a 6 hp engine, the total weight is 135 lbs (boat motor fuel passengers). Be sure to measure carefully and research thoroughly before diving in. Extra-extra long shafts are 30-inches long. Your at your local outboard dealer shopping for a new motor and the salesman hits you with the question, "short or long shaft?". xmlHttp.open('POST', 'https://bes.gcp.data.bigcommerce.com/nobot'); Engine height with stepped hull at transom - before I screw things up How to Measure Outboard Shaft Length: The Only Guide You Need You also have the option to opt-out of these cookies. Mounting the motor lower on the boat transom can create excessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. 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. You may wonder how deep your prop should be in the water. Your goal is to measure how the outboard will sit, so start from the clamping plate and follow the centerline of the hull. maxMicroAmount: 0.0, 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. Then open up the clamp bucket. Mounting the motor lower on the boat transomcan createexcessive spray, increase case drag, reduce underwater clearance, and negatively impact faster boats. 3 0 obj This will ensure the best performance. A transom saver, which can change the spacing between the lower unit and the trailer, negates some of the support. The standard shaft length for most outboard engines less than 125 horsepower is 20 inches. Doing this can have adverse effects. want to measure from the transom to the flat part of this bracket, Cavitation plates are used on the bottom components of boats to help them operate better. Any questions? of the motor off the transom Pretty easy to figure out but like I said its crucial to pairing a motor with a boat. Take your time and understand your boat and your entire transom. Depending on the manufacturer, size names might change. Place the bracket on the transom to the left of the main outboard or rudder. It is extremely important that the boater understands the significance of the transom's height. Small motors built for sailboats might come in a unique configuration with an extremely long shaft since these are mounted higher off the water. Read the following to get the optimal shaft length for outboard motors! It is very versatile as it generally . With some boats I have a pretty good idea as to what length motor should be hung on them. You dont have to be a mathematician to determine the correct boat transomangle. Because of the increased friction, cavitation reduces efficiency. The same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. The boat transom can be flat with zero degree angles. "brackets". This is the dimension you'll need to know when deciding between a short shaft, long shaft or extra long shaft for your outboard motor. The prop will be in cleaner, harder water as it advances farther aft, making it more efficient. Yamaha Outboard Motors: How To Measure Leg Length You can find your Mercury outboard model code on an ID plate or sticker. former editor at Boating Magazine and contributor to many national publications Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. Now that you have a better understanding of boat transom heights its time to take out the ruler and get the perfect measurements. Rebuilt - What You Need to Know, Lower Unit and Sterndrive Break-In Instructions. 1855 Alpine Avenue NWGrand Rapids, MI 49504This email address is being protected from spambots. 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. The height of the boat transom dictates the size of the outboard motor. Allowing the propeller to pull water from underneath and push it out behind the boat. It is where the outboard is mounted, and some boat owners place the name of the boat. bassboat can be a bit confusing at times; hopefully this will help sort 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. This is measured by the propeller shaft being parallel to the vessels bottom. If mounting directly to a boat transom: Measure from the top of the transom down to the bottom of the hull or keel (lowest point). When the boattransom is too low, the motor could end up underwater. The distance between the ends of a transom is measured in inches. Installing a Kicker Motor Bracket - Gone Outdoors #3. This, however, is not recommended for the beginning boater. Charles Plueddeman is Boats.com's outboard, trailer, and PWC expert. Simply start with the engine in idle, followed bytrimming the motor out by one-half to full trim. Measure straight down to the lowest point on the hull. Simply start with the engine in idle, followed by trimming the motor out by one-half to full trim. logoColor: "original", Spark Plug 25.0nm(18.4 Ft-lb) (2.55 Kgf-m) } If it measures anywhere from 17" to around 22", then your going to want to go with a long shaft motor. 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. Owners of bass boats, RIBs, or offshore fishing boats need to get this right. The cookie is used to store the user consent for the cookies in the category "Analytics". The cookie is used to store the user consent for the cookies in the category "Performance". out the confusion. 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. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. To do so, measure from the stern (back) of the boat to the midpoint of the hull on both sides. loadScript(ptScript); Outboard shaft length plays a crucial role in the performance of your boat. on How to Measure Outboard Shaft Length: The Only Guide You Need, ePropulsion vs Torqeedo: An All-Round Comparison, 55 lb Thrust Trolling Motors: All You Need to Know Before Purchase, Spot Lock Trolling Motor: Is It Worth It & Best Options in 2022, Wiring 24V Trolling Motors: 24 Volt Wiring Diagram (with Video), LiFePO4 Battery: Why Lithium iron Phosphate Batteries Are Your Best Options in 2022, Minn Kota vs MotorGuide: Best Option in 2022. enableMoreInfoLink: true, Then finally test your outboard, if the mount is perfect. The transom is the flat vertical section at the rear of the boat. To sum up, there is a simple calculator of the shaft length for outboard motors: Outboard Shaft Length = Transom Height +/- Factors. Shaft lengths are available in increments of 5. to where the brackets were actually resting on the transom. This cookie is set by GDPR Cookie Consent plugin. Later in the article is an image that shows you exactly where to measure. There your motor will be higher.) 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. stream Triton. Raising an outboard higher on the transom can reduce drag and raise top speed. <>/Metadata 127 0 R/ViewerPreferences 128 0 R>> The performance of these boats depends on quite a lot of factors, but getting the outboard length just right is an essential first step. This is measured by the propeller shaft being parallel to the vessels bottom. What is a Transom Saver And Do I Need One? - Boat Safe Eq*^?6R83e+j}UY.(M7k]~4g)g ~wmS{ O7t/o(W|X? Its important to note that manufacturers call their models different things. Among them will be first-timers or those who have recently purchased their boats. If you have a small boat with a 15 to 17 inch aft transom, youll most likely need a short shaft outboard. This provides seaworthiness and offers maximum protection from large seas. 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. You'll need a short shaft outboard if it's 15 or less than an inch shorter. Or it can have an angle degree as high as 30. Copyright 1999-2023 Boats Group.
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