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Motorboat

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Motorboat

A motorboat, powerboat, or speedboat is a boat that is exclusively powered by an engine; faster examples may be called "speedboats".

Some motorboats are fitted with inboard engines, others have an outboard motor installed on the rear, containing the internal combustion engine, the gearbox and the propeller in one portable unit. An inboard-outboard contains a hybrid of an inboard and an outboard, where the internal combustion engine is installed inside the boat, and the gearbox and propeller are outside.

There are two configurations of an inboard, V-drive and direct drive. A direct drive has the powerplant mounted near the middle of the boat with the propeller shaft straight out the back, where a V-drive has the powerplant mounted in the back of the boat facing backwards having the shaft go towards the front of the boat then making a V towards the rear.

A motorboat is a small craft with one or more engines for propulsion. Motorboats are commonly used for work, recreation, sport, or racing.

Boat engines vary in shape, size, and type. These include inboard, outboard (integrating, the engine, gearbox, and propeller in one portable unit mounted in the rear), and inboard-outboard (or “sterndrive”, which mounts the engine inboard and the rest outboard).

Fuel types include gasoline, diesel, gas turbine, rotary combustion or steam.

High performance speedboats can reach speeds of over 50 knots. Their high speed and performance can be attributed to their hull technology and engine. With a more powerful and heavier engine, an appropriate hull shape is needed. High performance boats include yachts, HSIC (high speed interceptor craft) and racing powerboats.

A V-type hull helps a boat cut through the water. A deep V-hull helps keep the boat's bow down at low speeds, improving visibility. V-hulls also improve a boat's speed and maneuvering capabilities. They stabilize a boat in rough conditions.

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