Outboard boats are powerboats propelled by one or more outboard engines mounted on the transom rather than by inboard or sterndrive installations. The outboard configuration is the most widely used propulsion arrangement on small to mid-size recreational powerboats globally, applied across fishing boats, dayboats, RIBs, center consoles, and utility craft from approximately 3 to 12 metres.
The primary practical advantages are accessibility and replaceability: an outboard can be removed from the transom for servicing without lifting the boat out of the water or accessing an engine compartment, and a faulty unit can be replaced or swapped with a hire engine while repairs are carried out. The exposed transom mounting keeps the bilge clear of mechanical components, maximising usable interior volume — particularly relevant on fishing boats where deck and storage space is at a premium. Weight is concentrated at the stern, which can affect trim and handling on some hull forms, particularly at low or very high speeds.
Modern outboard engines are four-stroke petrol units from manufacturers including Yamaha, Mercury, Honda, and Suzuki; two-stroke engines have largely been displaced by four-stroke technology in recreational applications due to emissions regulations in many markets. High-output outboards now reach 600 horsepower per unit, and triple or quadruple outboard installations are standard on large center consoles. Electric outboards are an emerging category suited to low-speed use on protected waters.
