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Types of Boat Engines
Exploring the 4 Key Types of Boat Engines Australia
Whether you’re a proud boat owner or simply a fan of life on the water, choosing the right boat engine is essential for optimal performance. With a variety of options available—including inboard, outboard, petrol, diesel, electric, and hybrid boat engines—it’s important to understand the differences between them and how each can enhance your boating experience. In this article, we’ll break down the key types of boat engines and their unique benefits.
Outboard boat engines
An outboard motor, or outboard engine, integrates the engine, gearbox, and propeller into one compact unit. Mounted at the rear of the boat, it hangs outside the hull and is used for both propulsion and steering.
To steer an outboard boat engine, the entire motor pivots from side to side, enabling smooth manoeuvring. It can also tilt up and down for trimming and easier trailering. On smaller boats, the engine is steered manually using a hand tiller, while larger vessels typically use a steering wheel.
The submerged propeller and gearcase allow the boat to plane quickly and handle turns with great agility. Outboard motors are light, powerful, and exceptionally quiet, making them the preferred choice for fishing, watersports, and leisurely cruising.
Inboard boat engines
Inboard engines are housed inside the hull of the boat, typically at midships, for optimal weight distribution. The engine drives the propeller through a propeller shaft that runs beneath the boat and exits at the transom. Unlike outboard engines, inboard engines do not control the steering. Instead, steering is achieved with a rudder or multiple rudders located behind the propeller, and a wheel controls the direction.
Inboard boat engines are particularly well-suited for boats used in watersports, as they generate the ideal wake for activities like wakeboarding. These engines are also the go-to choice for larger vessels that require more horsepower and torque, delivering superior performance on the water.
Sterndrive
Also known as inboard/outboards, sterndrive engines combine the best features of both outboard and inboard motors. Mounted inside the hull, they efficiently deliver power while being attached to the transom (the back of the boat) via a drive unit that resembles the lower gearcase of an outboard engine. This setup offers the versatility of an outboard with the added power and performance of an inboard.
Sterndrives are steered just like outboards—by turning the steering wheel, you rotate the drive unit, which then controls the boat’s direction. This makes them easy to navigate, whether you’re cruising or docking.
Ideal for boaters needing more horsepower, torque, and precise handling, sterndrives offer excellent agility and manoeuvrability. These features make them especially popular in pleasure boats, providing a smooth and responsive ride.
Sterndrive Jet drive/Jet Propulsion
Although jet drive engines are most commonly associated with personal watercraft, many boats also utilise this innovative propulsion system. Jet drives use water to both propel and steer the boat, providing a highly efficient and unique method of navigation.
Here’s how it works: water enters through an intake on the boat’s bottom, then is accelerated by the jet drive unit at the rear, generating thrust to propel the boat forward. The engine powers an impeller—similar to a propeller but with a sharper design—that pushes the water through the jet drive to create thrust.
One of the standout benefits of jet drive systems is their high performance, especially in shallow waters. Additionally, because there are no exposed propeller blades, they offer a safer option for boating in areas with debris or other watercraft.
Selecting the right boat engine comes down to understanding your specific boating needs. Whether you prioritise speed, manoeuvrability, or efficiency, there’s an engine type that’s perfect for you. Outboard engines offer versatility and portability, inboard engines excel in performance and power, sterndrive engines provide the best of both worlds, and jet drives are ideal for shallow waters and safe navigation. Still unsure? Speak to the Chivers Marine team to discuss your options further. We will make sure your engine aligns with your boating lifestyle to ensure an unforgettable experience on the water.
Frequently Asked Questions
What is rudder?
A ship’s rudder is a flat sheet attached to the stern (or back), that moves back and forth as the captain steers. It works by directing the water to move past the ship in a certain way, pushing the front of the vessel to the right or left.
How to tell if a boat is inboard or outboard?
Inboard engines are located inside the boat’s hull. Inboard engines are four-stroke automotive engines that have been modified for use on the water. These engines power a drive shaft that is connected to a propeller. Unlike an outboard, an inboard engine does not also steer the boat.
What is the most reliable outboard motor brand?
Yamaha is renowned for its outboard motors’ engineering excellence and reliability. Their outboards are known for being quiet, fuel-efficient, and environmentally friendly. Yamaha also offers a wide variety of outboard models to suit various boating applications
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Chivers Marine
An iconic name in Boating in Western Australia, Chivers Marine has been selling quality marine products since 1958.
The business that Laurie Chivers established over 60 years ago is still family owned and operated with Luke Chivers at the helm.
If you are looking for specialist advice and exceptional value Chivers Marine offers only the best brands supported by the best aftersales service in the industry
Chivers Marine
An iconic name in Boating in Western Australia, Chivers Marine has been selling quality marine products since 1958.
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