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The rigid buoyant boat (RBB) is a light-weight but high-performance and high-capacity boat. Based on the concept of a rigid-hulled inflatable boat (RHIB), it has a tube/sponson manufactured from a solid material such as moulded polyethylene or aluminium which is much more robust than the fabrics commonly used.
All these boats are made unsinkable by injection into the hull of very light materials (closed cell polyurethane foam) : with these buoyancy reserves, the boat itself full of water always remains in positive buoyancy; they also have a tight sealed compartment. All-weather lifeboats from 15 meters to 18 meters are self-righting.
Buoyancy and weight determine whether an object floats or sinks in a liquid. The relative magnitudes of weight and buoyancy determine the outcome, leading to three possible scenarios. Negative Buoyancy: when the weight of an object is greater than the up-thrust it experiences due to the weight of the liquid displaced, the object sinks.
RNLI inshore rescue boat during Falmouth Lifeboat Day, August 2006. A rigid inflatable boat (RIB), also rigid-hull inflatable boat or rigid-hulled inflatable boat (RHIB), is a lightweight but high-performance and high-capacity boat constructed with a rigid hull bottom joined to side-forming air tubes that are inflated with air to a high pressure so as to give the sides resilient rigidity along ...
Watercraft can be grouped into surface vessels, which include ships, yachts, boats, hydroplanes, wingships, unmanned surface vehicles, sailboards and human-powered craft such as rafts, canoes, kayaks and paddleboards; [3] underwater vessels, which include submarines, submersibles, unmanned underwater vehicles (UUVs), wet subs and diver ...
A variable-buoyancy pressure vessel system is a type of rigid buoyancy control device for diving systems that retains a constant volume and varies its density by changing the weight (mass) of the contents, either by moving the ambient fluid into and out of a rigid pressure vessel, or by moving a stored liquid between internal and external variable-volume containers.
Royal Navy World War II motor torpedo boat planing at speed on calm water showing its hard chine hull - note how most of the forepart of the boat is out of the water. At rest, a vessel's weight is borne entirely by the buoyant force. Every hull acts as a displacement hull at low speeds: the buoyant force is mainly responsible for supporting the ...
Most non-competitive freediving is done with some positive buoyancy at the surface, and the diver fins downward to descend. The diver's buoyancy will decrease with depth as the air in the lungs and the wetsuit is compressed. At some stage the diver may become negatively buoyant.