A lower unit with a propeller also incorporates a skeg, which offers it some protection from striking hard objects. Most of the time the lower unit swings a propeller for propulsion, but in some cases the lower unit houses a jet drive. A motor mount just below the powerhead bolts or clamps onto the transom of the boat, and the midsection of the outboard, which encloses the drive shaft and exhaust housing, has a lower unit bolted onto the bottom. The powerhead (or motor, in the case of an electric outboard) is protected by a removable cowl. Outboard Engines An outboard engine sits on the transom of a boat and has its own self-contained drive system.
So let’s start off by dividing engines and power systems into their most basic forms: outboards and inboards. On the other hand, a “jet engine” comes in both outboard and inboard varieties. The term “outboard engine,” for example, commonly describes both the powerhead and the lower-unit drive system that's attached to it. There’s just one problem: many power and drive systems are integrated. So logically, you want to distinguish between the two. Strictly speaking, the engine is what creates power and the drive system is what transfers that power into thrust. Which is best for the type of boating you enjoy? Is newer technology necessarily better? And which engine and drive systems are evolving the fastest? Let’s take an in-depth look at motorboat engines and power systems. But sorting through all the different options can be quite difficult. Boat engines take many shapes, sizes, and forms, ranging from the common outboard to rarely seen surface drive systems - which is why you’ll find plenty of current information on the latest and the greatest in our powerboat Engines and Parts Reviews. Here we demystify them and explain the basics behind what powers your boat to help you better understand all the types of motorboat engines out there on the water. Marine engines and power systems can be quite complex and varied.
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