Engines were only available in the 20 inch "long" shaft version. Tohatsu is a good motor so is Nissan from what I have heard do a on line search see if you can get parts... if you can then you should be all set there should be plenty of marine mechanic's out there that can do the work... Nissan bought Mercury long time ago. 📏 Do I Need A Short Shaft Or Long Shaft Outboard? Trolling motors are also a great alternative for owners looking for more green solutions with less of a price tag. The force of leverage would most definitely be increased. For daysailers and short one-design racing sailboats, it depends on the position of the outboard mount. How To Measure Outboard Motor Shaft Length [Long v Short. This is measured by ensuring that the propellors radius (the distance from the propeller hub to the outer blade edge) falls below the boat's hull. Workboats, sailboats, and displacement-hulled boats fall into this category.
20-30 years ago 4-strokes were heavier, but not today. Should you choose a short or long shaft boat motor. Wherever the outboard clamping bracket is, use this as the basis for measurement. Our auxiliary is a long shaft... it just depends on the configuration of your boat and position of the mounting bracket. To be clear, if I take a lower unit off and measure the driveshaft at 17", that would be considered a short shaft, being closest to 15 inches.
🤷♂️ What Happens If You Put A Long-Shaft Motor On A Short-Shaft Boat? Long shaft–20 inches. If you know what your doing you can safely mod the boat to suit your purposes. In any case, unless you are getting a steal of a deal on the longshaft motor, I'd wait and find a short shaft motor instead. Beyond motorboats designed for large outboards, you will see outboards hanging on the sterns of everything from small canoes to large cruising sailboats. Considerations of the boat's design aside, it is wise to keep in mind. Short shaft vs long shaft outboard motors. View attachment 176903. The longer shaft may also impact the boat's steering. Also, the vertical "shift shaft" comes in two.
The typical long shaft outboard is around 20 inches (50. If you own an inflatable boat or are looking to purchase one, getting an outboard motor or trolling motor for your boat has crossed your mind. This will keep the prop in the water when the boat pitches in waves, or hobby-horses. In the late 80's, with the increased popularity of deep-V offshore. Johnson / Evinrudes (OMC) are the easiest to convert shaft length. Outboard motors long shaft vs short shaft. 1️⃣ A shaft that's too short can cause the hull to obstruct water flow, reducing the engine's power output. Let's assume you have just purchased a new dinghy and you don't know what size motor to pair with it. The correct choice, as very few of these engines will be found in 20 inch. When are you most likely to be using the motor?
These are precisely sized, and if the shaft were to be reduced, it would involve a completely new shaft assembly and replacement of the relevant components. The following transom measurements with matching shaft lengths from several manufacturers are listed below. The flat part of the bracket that rests on the transom when mounted will give you the same point of reference as the transom does on the boat. The faster your boat, the more critical it is to get the sizing just right. There are also specialty motor shaft lengths. And 20 inch engines. 4 Stroke, 2 Stroke & Electric. Accept those outboard motors that are going to be prevalent in the. Inflatable Boats: Motor Shaft Length For Inflatable Boats –. High powered boats usually only come in long and extra-long variants. In comparison, the classic 2-stroke Mercs were much lighter, in the 112 - 115lb range for short/long shaft.
Contact: As long as the clamps get a good purchase on the transom you should be able to get away with a shim on the top of the transom. Traxstech Fishing System. 5m, extra short shaft and short will work, depending on the transom height, some over 40 cm / 15. 5 almost too much hsp for the hull! Short shaft vs long shaft outboard transom measurement. This will dictate what length Outboard you need. Getting the wrong size motor could lead to underperformance or worse, damage to the motor.
77 KiB) Viewed 43628 times. Unless, the motor is disposable, and your into rowing back to the boat ramp. Just measure the distance between the motor mount and the water surface. Too much shaft length in the water, creates drag when moving at speeds above idle. If our canoe has a 17" transom and draws 3"-4", which is typical for most canoes but depends on the load, then we would have 13"-14" of transom sticking above the water level at displacement speeds. If the propeller is too low, the distance between the boat's hull and propeller will increase, and the engine will have to generate more force to move the boat forward. I'm sold on they y-stern design and I assume it will be much more stable than side mounting.
In order to choose the correct size gas outboard or trolling motor, you will need to make two different measurements on your boat. Easy to start, steer, life and lower. The shaft length of an outboard motor is the distance between the anti-cavitation plate (the metal plate horizontally above the propeller) and the motor mount (the lowest point of the propeller). Kfedka, we've talked before... The advice to premix the autolube comes from a service engineer who supplies many of the North Sea Oil industry safety boats only with Yamaha.
The optimal distance between the blade and keel is 4 inches (10cm). Having your boat's propeller at the perfect height will affect your steering control, especially in shallow waters. Boat hulls are designed in three basic types that range from slow displacement and semi-displacement hulls to the fastest planing hulls. Market; in other words, unless you already have your outboard, do not.
If it's on the transom then a long shaft helps when the boat pitches and the prop starts breathing air, the downside being that they are heavier, more expensive, rarer if buying used, and flippin' awkward things to handle and transport (especially if extra long). Tohatsu (Nissan) and Mercury are same motor if you want to save some coin. This places the propeller farther from the stern, and common sense tells me that this TAD loosens strict recommendations for location of the cavitation relatively to the stern bottom. The sharp-minded reader (and what Duckworks reader would not. 6lbs and the long shaft version is 161lbs. Typical motor lengths include the following. Simply measure from the top of the transom to the bottom of the hull. One is used for the trolling motor the other for the fishfinder. That a spacer is not a reasonable recommendation, without further research. Version without disassembling the lower unit to install the 20 inch. The yardstick directly on the transom. There are a few types to choose from, fixed or adjustable, manual or hydraulic assist.
Getting the right shaft length is vital to the performance of the inflatable and ensuring your motor doesn't bottom out. Thank-you for your reply. I would recommend some sort of ratchet strap holding it down rigidly and not rely on the locking pin or even the pivot holding the engine to the bracket. Nice motor, too heavy, unnecessary hp. Engine: Suzuki 115hp. No matter what size of boat you are running, one of the most critical choices you can make when buying an outboard motor is the shaft length.
If you can, measure the transom height to determine the ideal shaft length or check the boat's manual. When modifying a design specifying a 20 inch transom, to a 15 inch. I would ask you to go back and measure the transom of your boat.