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. 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. While this is the case there is certain saltwater motors that are extra extra long at 30 and 35 shaft. x\[D~OUCO6[j](l%ay <8cylY{.L2s#]~U6A|Wj]-oo|mubqY6wbY_|!>Z8(RB:RHeTzOGO_=~t\ Say the 20 shaft is a long shaft length for gas engines, but it is a short shaft length for electric outboard motors. The greater the number, the more the drive may sway (also called tuck under or negative trim). Also, how do you determine the length of an outboard transom? Read the measurement on the transoms bottom. enableMoreInfoLink: true, Actual shaft length is 21.5" on those. 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. Measure from the top of the transom to the bottom of the hull.
The Best Way to Measure Prop to Pad | How to measure Outboard Motor Height One of the main concerns is causing the engine to overheat if not enough water reaches the engine to keep it cool. 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. No one wants to have issues with a new transom or boat repairs. displayMicroOffers: false, When mounting the engine, you want the cavitation plate to be 1 above the boat bottom for every 12 away from the transom. This is probably the worst case scenario out of the two. 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. A long shaft engine requires a height of 20 and extra-long shaft engines will need a transom height of 25. #3. Wherever the outboard clamping bracket is, use this as the basis for measurement. Since the length of the shaft of your outboard is associated with the size boat, smaller engines will generally have shorter 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. What Types of Documents Can be Sent to your Kindle Library? Simply start with the engine in idle, followed by, If you decide to make some custom adjustments we have the. The height is approximately six inches higher than with a propeller. For most boaters this is a no brainer, but for the novice or inexperienced boater it may be a tougher question. For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. The first step is to determine the height of your boat's transom. Pad to bottom of
from the transom. 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". It doesnt matter if you have a fiberglass boat, bay boat, big or small boat. Higher mounting decisions should be left to the professionals. })(); will be to the flat part; if you measure to the bottom of the brackets
Tilt your motor until the bullet of the gearcase is
Boost Speed with Outboard Engine Height Adjustments WHAT LENGTH OUTBOARD DO YOU REALLY NEED? - Van's Sport Center What matters is the actual measurement in the specifications, not the name. 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. disregard the downward pointing "hooks" at the front of the
He is a Whether you already own a boat or looking for your first watercraft we are here to service your needs.
Transom Outboard Engine Position - YouTube Read the following to get the optimal shaft length for outboard motors! If the height of the boat transom is off it can cause major issues. The same is true for the newest, high-powered offshore fishing boats, where triple or quadruple motor setups are becoming more and more common. Other boats that need long shafts are. 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. maxMicroAmount: 0.0, Extra-extra long shafts are 30-inches long. Thats it. primeApr: 12.99, Simply start with the engine in idle, followed by trimming the motor out by one-half to full trim. In the second photo, we've measure down from the top of the Detwiler
It is possible that the motor could hang low while transporting on the boat trailer causing future boat repairs. Not to measure boat speed, but to gauge the mounting height of the outboard motor on the boat transom. Shaft lengths are available in increments of 5. A: The answer varies by boat, but here are some rules of thumb for matching a short shaft outboard to your boat. Your email address will not be published. Top 10 Choices for Boaters, Mercury Introduces 600HP V12 Verado Outboard Engine, The Outboard Expert: Tohatsu Propane Outboard Engine. The transom is the boats flat vertical part at the back. It is unsafe to have the engine block too close to the water on a low transom. Safely but briskly accelerate. So how to measure outboard shaft length? Then adjust the motor in a higher hole with a flat head screwdriver. Problems with getting the ventilation plate too low include slower hole-shot and lower top-end speeds. window.dataLayer = window.dataLayer || []; These cookies ensure basic functionalities and security features of the website, anonymously. Offshore vessels are often equipped with a large mounting bracket so that the transom can be left at full height. This measurement was approximately 4". Chances are the boat was designed with a specific size of outboard in mind. You will also risk hitting bottom or submerge objects more frequently such as rocks or logs. Outboard shaft length plays a crucial role in the performance of your boat. To sum up, there is a simple calculator of the shaft length for outboard motors: Outboard Shaft Length = Transom Height +/- Factors. straight edge on the top of the transom to "extend" it out
Here is a picture that shows you exactly where the outboard motor shaft length stands: Usually the shaft length for outboard motors falls into the following 4 sizes: In practice, you may find the outboard motor shaft length varies among different brands and manufacturers like the Honda,Suzuki, Yamaha, Torqeedo, etc. Measure from the top of the straight edge to the center of the front
However, with the outboard shaft length too short, meaning the prop is too close to the surface, the engine is likely to ventilate and therefore slip on acceleration or lose power. Measure the area of the transom directly where the engine will be mounted. Any owner seeking the last bit of speed from an outboard-powered boat should grab a yard stick. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Doing this can have adverse effects. You also have the option to opt-out of these cookies. Recommended Engine Oil 2-Stroke Outboard Motor Oil. Owners of bass boats, RIBs, or offshore fishing boats need to get this right. (Putting a
How to Raise Outboard Motor on Transom? - Raising the Outboard Motor Your at your local outboard dealer shopping for a new motor and the salesman hits you with the question, "short or long shaft?". Keep these numbers in mind if you ever have a need for a new outboard motor for your boat.
Proper Mounting Height for an Outboard - Gone Outdoors 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. s.setAttribute("href", "https://cdn.paytomorrow.com/css/pt-mpe.min.css"); h[0].appendChild(s); <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 595.2 841.8] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>>
How the outboard will sit on the back of the boat depends on how the transom is designed. When you measure the width of the stern, mark the center with a grease pencil. (In the case of the faster
Most transom savers can support up to a 150HP motor, which is sufficient for most regular boats. Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. However, the motor should not be raised more than 5 inches above the standard position. What is Transom Height? When the boat transom is too low, the motor could end up underwater. As a yacht designer and boater, I prefer longer shafts. The pros and cons of properly . You need JavaScript enabled to view it. There are also specialty motor shaft lengths. 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. Safely but briskly accelerate. How to Measure Transom Height For vessels with transom-mounted outboards, you can easily figure out which type of outboard you need to get. As mentioned above, the operation of the propeller relies on the transom height. 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. Happy boating! The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". There are 2 steps to help get a relatively accurate figure. You can use a longer shaft than recommended and your boat will work fine. On this type of boat, if you are in doubt, default to the longer-shafted outboard. Charles Plueddeman is Boats.com's outboard, trailer, and PWC expert. 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. var path = 'hr' + 'ef' + '='; They operate as a planing surface, allowing your boat to climb to the top more quickly. Measure straight down to the lowest point on the hull. You can order an outboard in lengths ranging from 15 inches to 30 inches, depending on its power output and possible uses. <>/Metadata 127 0 R/ViewerPreferences 128 0 R>>
The cavitation plate is the horizontal surface of the lower unit immediately above the propeller. :$I>M W$h"%U_yzIb?]NHg_G|r@nX eTf."SQ
Guide to Boat Transom Heights - Marine Parts Warehouse It also cuts into speed and fuel efficiency. This will be the
addyd53b59933f6c3f2e8b59f1b4a6d41fa5 = addyd53b59933f6c3f2e8b59f1b4a6d41fa5 + 'vanssports' + '.' + 'com'; Beginning boaters should be aware of the boats measurements. A deep Vee hull will result in a different measurement than a flatter . The form of a boats transom varies depending on the manufacturer and model. What types of boat need an extra long shaft? Small motors built for sailboats might come in a unique configuration with an extremely long shaft since these are mounted higher off the water. 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 Low Should a Motor Set on a Pontoon Boat? (Explained) 4 0 obj
height (that I'm aware of); probably the most common is:
Setting Height of Outboard Motor - YouTube 0:00 / 0:46 Setting Height of Outboard Motor nates90 71 subscribers Subscribe 83 Share 63K views 7 years ago #boatservice #outboardmotor. This cookie is set by GDPR Cookie Consent plugin.
Installing a Kicker Motor Bracket - Gone Outdoors var h = d.getElementsByTagName("head"), Always weigh the risks of making adjustments. s = d.createElement("link"); Amazon has plate extensions to allow adjustments without buying a new motor: T-H Marine Jack Plate Extension. measuring; you may have to "extend" the flat part of the
Which Navigation Lights Does Your Boat Need? would be more accurate.) This allows the engine to idle without the flow of the exhaust being restricted. The transom is the flat vertical section at the rear of the boat. 2 0 obj
I would also recommend finding your maximum horsepower rating which is located on the yellow coast guard tag towards the back of your boat. If the height of the boat transom is off it can cause major issues. Its important to note that manufacturers call their models different things. Expectedly, when the transom angle is zero, it means it is flat. On the downside, a higher mount can interfere with the boaters steering capabilities. To measure the transom height, measure from the center on for transom (rear of the boat). 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.
Outboard Motor Shaft Length & HP to Boat Calculating Anything bigger than that your obviously going to need an extra long shaft. A yardstick will help you determine if your outboard engine is at the right height. } It is very versatile as it generally . It is extremely important that the boater understands the significance of the transoms height. of the motor off the transom
(1) Multiply the overall length of your boat (in feet) by it's widest beam at the stern (excluding any Fins and or Shear) (2) Locate that value on the left hand vertical column of the chart below. Take your time and understand your boat and your entire transom. So how to determine the outboard shaft length? Some fishing boats can handle the motor being underwater. Take your time and understand your boat and your entire transom. When the right length motor is hung on the transom of a boat, the cavitation plate (the large plate that extends out over the propeller) should be even with the very bottom of the boat. With a jack plate, you can mount it exactly where you want it. A reversetransom that sits too high can impact the propellers of the motor and motor bracket. The distance between the ends of a transom is measured in inches. It is where the outboard is mounted, and some boat owners place the name of the boat. Its still smart to measure it yourself though, just in case, the design changed over the years. Displacement hulled vessels like sailboats and workboats can benefit from a little more space between the hull and cavitation plate, but not much.