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An inboard engine, which is also called a Power Plant, is an engine which is installed in a boat, as opposed to being attached or installed on the outer shell of the boat. An inboard engine boat has everything except the shaft and a propeller inside the boat.
An inboard engine is essentially a four-stroke engine that has been adapted for marine use. Smaller powerboats may have two-stroke engines that require a mixture of oil and fuel to run properly.
There is a transmission located on the back of the engine, and it is attached to a propeller shaft. The propeller shaft passes through the bottom of the boat, supported by struts on the bottom of the hull. The propeller is attached to the end of the shaft, and a rudder is placed aft of the propeller to control the direction of the boat.
There are two types of inboard engines: v-drive and direct drive. A v-drive inboard engine, which is also called a Vee-drive or Angle drive, is mounted in the back of the boat, and faces backwards. The shaft goes toward the front of the boat, and this creates a āVā towards the rear of the boat.
The advantage of v-drive engines is that everything is placed towards the rear of the boat, leaving more room in the interior. A direct drive inboard engine is mounted near the middle of the boat. The propeller shaft goes straight out from the back of the boat.
Inboard engines are usually quite a bit heavier than outboard engines, depending on the horsepower. Inboard engines are positioned in such a way, with a low center of gravity, as to lend better balance in the boat. This type of engine is considered to be the most efficient method of transferring power from the engine to the propeller.
Even though inboard engines are heavier, they have fewer limitations than outboard engines do, simply because there is no need to have everything inside one unit.
The disadvantage of inboard engines is that they take up a lot of space inside the boat. Inboard engine boats are also not maneuvered as easily as outboard engine boats at low speeds or in reverse gear because the propeller is in a fixed position.
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