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 and therefore being much more robust than the fabrics commonly used. Boats with foam filled collars such as the secure all-around flotation equipped (SAFE) boats[1] employed by the US Coast Guard can also be classified as Rigid Buoyant Boats rather than "true" RHIBs as the collar is solid foam rather than inflated. The handling tends to be very similar to a RHIB; likewise they will remain afloat (buoyant) even if completely flooded. Aluminium RBBs tend to be bespoke (custom-made to specification) or low-volume products whilst the tooling cost of rotomolded polyethylene boats tends to require these to be higher volume products. At least three manufacturers are producing rotomolded boats of this type.[2][3][4] One supplier has demonstrated the robustness of the boats by dropping one from a crane onto a concrete car park.[3] The U.S. Navy’s small unit riverine craft and the Coast Guard’s Defender class 25-foot (7.6 m) boats are examples of RBBs.
_2_come_ashore_with_two_simulated_detainees_to_be_turned_over_to_Mobile_Security_Squadron_3,_Det._33,_during_COMET_2007.jpg "US Navy 070910-N-6639M-043 Sailors assigned to Riverine Squadron (RIVRON) 2 come ashore with two simulated detainees to be turned over to Mobile Security Squadron 3, Det. 33, during COMET 2007.jpg (374 KB)")
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The original article can be found at Rigid buoyant boat and the edit history here.