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Parts of an inboard motor8/27/2023 This year was no different, and the focus seemed to be on outboard engines. When it comes to shows, the Miami International Boat Show is the granddaddy, and it's where manufacturers typically introduce new and improved products. But they have compelling advantages: They're self-contained, can be removed relatively easily for service or repower, they're powerful for their size, and they're usually simple to winterize. Outboards may be more difficult to work on for a DIY boater, more expensive, and they limit swim platform area. Multiple engines (three and even four) are becoming common on larger boats, and it's also possible to incorporate joystick systems for easier docking. While two-stroke engines have historically been lighter than four-strokes, that's not always the case anymore. Outboards are available in a vast range of power options from diminutive 2.5-hp models to monsters putting out 600 hp or more. The engine can be bolted directly to the boat's transom or mounted onto a bracket, and some new larger boat models place outboards in a well. Outboards are a convenient package with engine, transmission, and prop all in one. Not your grandad's outboard: Modern engines Good for: planing and high-speed boats such as runabouts, also dinghies and manufacturers are beginning to use them on larger boats. But these cons are outweighed by the advantages of minimal loss of power coming out of the engine, ease of service because most engine mechanics can work on them, and they're available in many sizes, including large diesels. There is some inherent inefficiency due to shaft angle, they take up valuable room down below, and they're often more difficult to trailer. Recently, joysticks have been introduced that, in conjunction with a bow thruster, make close-quarter maneuvering easy. Inboard engines may be gasoline, diesel, or now even electric-powered. These engines are usually situated low down near the middle of the boat, with a transmission connected directly to the rear of the engine leading to a propeller shaft going down at an angle through the bottom of the boat, with a prop bolted onto the end. Recreational powerboating was built on inboard engines that were little more than automobile engines marinized and adapted for boating.
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