Small boats have four-cycle gasoline inboards, but above about 30 feet, diesel engines are more common. Inboard motors come in any shape and style that boat makers can dream up. Chances are you can find a larger inboard boat for less money than one with multiple modern high-power outboards. Inboards are also used when the boat is simply too big to be pushed by outboard power. They will become more common as the technology is more widely adopted. Sidenote: As of 2022, both of these types of outboards are in production and available but still very rare. Maybe you want a type of motor that isn’t made as an outboard, like diesel or an electric. The inboard engine is the basic design of any vessel that can’t be fitted with an outboard. The rudder will be located behind the propeller, so it is very effective if the boat is in forward gear. On an inboard boat, the helm wheel turns a rudder. Since the motor doesn’t move, as is the case with an outboard, the boat must be turned using another means. The entire assembly is securely mounted to load-bearing parts of the boat’s structure, so it’s very robust. ![]() It lays flat, and a driveshaft extends through the bottom of the hull and connects to a propeller. However, as outboards have advanced in recent years, anything else will have to justify itself in other ways.Īn inboard motor is the traditional “other way.” An inboard boat has the engine mounted in the center of the vessel. When outboard motors topped out at 250 horsepower and only two could be mounted on the biggest boats (usually about 27 feet long), there was a case to be made that anything requiring more power would have to be built differently. The most common engine found on an outboard is a conventional four-stroke gasoline engine, although electric motor outboards like the Torqeedo and propulsion are catching on. The biggest outboard engine manufacturers in the world include Yamaha, Suzuki, Honda, Tohatsu, and Mercury. The tilt and trim unit also allows the entire motor to be tilted up for storage, so when the boat is stopped, the propeller and lower unit will not be sitting in the water. This is an important tool if your boat won’t plane. When the boat is on plane, the skipper can pitch the bow up and down to adjust for the boat’s loading and sea conditions. ![]() The outboard also tilts on the bracket so that the thrust from the propeller can help trim the boat. This is an important concept to get a feel for, especially when docking in close quarters. This is called vectored thrust, meaning that you can’t turn the boat if the propellers aren’t turning. So on this type of boat, the helm controls where the propeller thrust is pointed. The outboard pivots on its bracket to steer the boat. Most of them nowadays have brackets that extend behind the transom low to the water where the outboard is mounted. The boat must be designed from the ground up to accept an outboard. Outboard engines are mounted on a bracket that attaches to the boat’s transom. Moreover, boat makers are designing go-fast boats that can mount four or more of these engines! Today, the most powerful outboards make more than 600 horsepower. Outboards have traditionally ranged in size from 2 to 250 horsepower, but manufacturers are squeezing more and more horsepower out of these motors. The propeller is connected to the gearbox. The engine is mounted vertically on a drive shaft, which connects to a lower gearbox under water. They are built from the ground up to be mounted on the back of a boat, from their special mounting brackets, integrated steering controls, and water-resistant exterior cases.Īn outboard motor isn’t different from other motors you might be familiar with, be it a small gasoline two-stroke from your lawn mower or six-cylinder, four-stroke car engines like in your Honda Accord. Outboard motors are the most common type of motor on small vessels these days. Advantages of Outboard vs Inboard Outboard Boats.What Is an Inboard/Outboard or IO Motor?.Advantages of an Outboard vs Inboard Boat.Outboard vs Inboard Motors – Which Is Better?. ![]() What matters most when it comes to boat engines is the type of boat it’s mounted to! Table of Contents They’ll all do much the same things in the end. But from the perspective of a boater who just wants to enjoy a day on the water, it’s a little like comparing which model of SUV you want to rent for vacation. From a gearhead perspective, it’s all pretty interesting stuff. Here’s a primer on all things boat engine related so that you can tell the difference. All terms describe different types of engine setups on boats. Inboard-outboard, inboard, and outboard motors.
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