![]() Today, Mercury MerCruiser gasoline sterndrive engines range from 200hp to 430hp. The trimmable drive improves performance and economy, and because the drive can be trimmed out, or raised, it allows the boat to be beached. ![]() This allows for easy, confident maneuvering at low speed. The sterndrive engine (sometimes called an inboard/outboard, or I/O) was devised in the early 1960s as a power system that combines the torque of an inboard engine with a steerable and trimmable drive unit mounted on the transom. The Joystick Piloting technology allows the engine to work with bow and stern thrusters to provide ultimate vessel control and a superior driving experience for the boater. For instance, a classic, single-prop inboard can be tricky to handle around the dock unless it’s equipped with Mercury Joystick Piloting for Inboards (also available for dual-inboard boats). Today’s technology from Mercury also helps to overcome some inherent challenges with inboard boats. An inboard can also provide power without creating excessive turbulence behind the boat, which allows builders of specialized wake sports boats to shape the hull to create the most desired wake for skiing, boarding or surfing. The engine makes a lot of torque, and the prop is always in undisturbed water under the boat, both of which help pull water-skiers and boarders quickly up on plane, and hold well against the strain of the tow line. Inboard power offers a number of advantages for tow sports. Today, inboard power remains most popular for specialized tow sports boats, which may be powered by a Mercury® MerCruiser® Tow Sport V8 inboard engine. That began to change in the mid-1950s as outboard motors became more powerful. In the early years of pleasure boating, only converted automobile or aircraft engines offered enough horsepower to move even midsize boats runabouts. If there are classic wood boat on your lake, they are almost certainly inboard-powered. A separate rudder steers the boat.Īt one time, almost any pleasure boat bigger than a row boat had inboard power. A gasoline or diesel engine is located within the boat, and power is transferred to the propeller by a shaft that passes through the bottom of the boat hull. Inboard power is the classic, original marine propulsion system. So what’s the difference, and why so many options? Let’s take a look at the advantages, and most popular applications, for each propulsion system. ![]() Those options fit into three main categories – outboard, sterndrive and inboard. No other marine engine manufacturer offers a broader selection of propulsion options than Mercury Marine®. ![]()
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