![]() ![]() It also means you can fish or swim off the back of the boat more easily. Wake surfers and water skiers are safer when you have this kind of engine. The benefit of an inboard engine is that it’s not in your way. Inboard motors run on gasoline or diesel fuel as well. The main difference is just where the engine is located. Functionally, these are both very similar to an outboard. That can cause the stern to rise up a little bit. It also weighs down the back of the boat. Because of the extra step, a V-drive is usually not as powerful as a straight shaft. The transmission has to redirect backwards to a shorter shaft out of the boat. It allows you to have more interior cabin space. The shaft extends out of the engine through the bottom of the boat. In this setup, you have a rear facing engine. The straight shaft will take up more room but is pretty reliable. ![]() Your boat can either have a V-drive inboard or a straight drive shaft. Typically, inboard boats are over 26 feet long. You’re likely to see these in large vessels because they have the space to accommodate it. There will also be a rudder in place behind the propeller to allow for steering. They are within the hull and a driveshaft connects to the propellers under the boat at the rear. Like the name suggests, this type of engine is mounted inside the boat itself. As battery technology improves, so will these engines. However, just as with cars, there are electric motors also available. You can also find diesel engines and ones that run on mixes of gas and oil. Traditionally, outboard motors run on gasoline. Something that size could have you racing across the water. On the other hand, you can also get a 600 horsepower V12 outboard. A small outboard can be more than enough to power a fishing boat. In terms of function, outboard motors can come in a wide array of sizes. They are also economical when it comes to fuel use. They can run very quietly and provide great power. But modern outboards are a whole new breed. Back in the day, they were noisy as all get out. Typically, you’ll see this mounted right on the transom of a boat. The propeller thrust moves the boat forward. The engine rotates a shaft that spins the propeller. It can be removed from a boat entirely if need be. An outboard motor is designed to swivel to provide reliable steering. It’s everything you need to make your boat move. It contains the entire engine, a gearbox, and the propeller. An outboard engine is a self-contained external motor unit. This is one of the most common propulsion systems. Let’s take a look at the basic kinds of boat propulsion available. ![]() Some are faster and more efficient than others. Some boats obviously need more powerful motors than others. Boat propulsion depends on a number of factors. Not only is the purpose different, and the look, but how it moves. These transmissions allow space to be maximized in the boat since the engine is forced further towards the rear.Anyone can look at an aluminum fishing boat and a yacht and know that they are not the same. These transmissions are also bi-directional eliminating the need for opposite rotation engines. This is a better longterm setup for the engine and lubrication system. Note the output flange is already angled downwards so the front of the engine does not have to be raised so dramatically. The introduction of these types of transmissions pretty much eliminated the need for opposite rotation engines. These are the more common transmissions since the mid-90’s and are bi-directional. The pump in the tranmission is flipped 180 degrees to allow for the opposite rotation on the one engine. Note that the front o fthe engine will be tipped upwards to achieve the necessary propshaft angle. These are normally associated with the older boats where one engine turns left hand an dthe other right hand. This is not the case as an inboard in the design where the propshaft protrudes thru the boat hull whereas an IO has the engine in the boat and the outdrive mounted on the outside of the boat. Many consumers think an inboard is a sterndrive simply because it is NOT an outboard. We are consistently faced with the questions of what the differences are between Sterndrives’s (also known as inboard outboard) versus a straight shaft inboard versus a V drive inboard. ![]()
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