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Runabouts can be powered by inboard engines, outboards, jet drives, or inboard-outboard (I/O) drives. Engines can be gasoline or diesel systems. Inboards have the engine block permanently mounted within the hull of the boat, with a drive shaft and a propeller to drive the craft underneath the hull, and a separate rudder to steer the craft.
Personal watercraft boat conversion kits exist as Waveboats. [2] The United States Coast Guard defines a personal watercraft, amongst other criteria, as a jet-drive boat less than 12 feet (3.7 m) long. [3] There are many larger "jetboats" not classed as PWCs, some more than 40 feet (12 m) long.
A jetboat is a boat propelled by a jet of water ejected from the back of the craft. Unlike a powerboat or motorboat that uses an external propeller in the water below or behind the boat, a jetboat draws the water from under the boat through an intake and into a pump-jet inside the boat, before expelling it through a nozzle at the stern.
A 16-foot jon boat. This is the style of boat that 2 duck hunters were using when they took on water in North Myrtle Beach, SC on the evening of January 26, 2023. Photo from Lund Boats website.
Jet drives are inefficient in low speed vessels, but may have other advantages that make them suitable for a given application. Internal drive propulsion was originally designed by Sir William Hamilton (who invented the waterjet in 1954) for operation in the fast-flowing and shallow rivers of New Zealand, specifically to overcome the problem of ...
A pump-jet, hydrojet, water jet, or jet drive uses a ducted propeller (axial-flow pump), centrifugal pump, or mixed flow pump to create a jet of water for propulsion. These incorporate an intake for source water and a nozzle to direct its flow out, generating momentum, and in most cases, employing thrust vectoring to steer the craft.