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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.
The boat was reported to reach a speed of four mph moving upstream. [7] [8] [9] On December 21, 1833, Irish engineer John Howard Kyan received a UK patent for propelling ships by a jet of water ejected from the stern. [10] In April 1932, Italian engineer Secondo Campini demonstrated a pump-jet propelled boat in Venice, Italy. The boat achieved ...
Flats boats are often small easily trailerable boats although some may reach up to 23 ft in length [6] or more. They are typically equipped with outboard motors and offer a relatively shallow draft compared to other boats of the same length, to allow for passage over sandbars, oyster beds or other submerged objects or underwater features with less risk of damaging the hull or engine.
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.
The nearly flat hull of a johnboat tends to ride over the waves rather than cut through them as a V-hull might; this shallow draft – only a few inches [2] – enables the johnboat to operate in very shallow water, [3] but limits its use to calm waters. Johnboats typically have a transom onto which an outboard motor can be mounted. They are ...
Inboard-Outboard (or stern drives) are a hybrid, with an engine block mounted within the hull linked to a pivotable lower drive unit which steers the craft, similar to an outboard motor. Jet Drives have a propeller enclosed in a pump-jet that draws water from underneath the hull and expels it through a swiveling nozzle in the stern.
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