The D-class lifeboat consists of two
sponsons, together housing seven inflatable segments intersected by baffles. The main construction fabric is
Hypalon-coated
Nylon which provides a durable, non-tear surface. This was one of the smaller classes of lifeboat operated by the RNLI, and they were a common sight at lifeboat stations around the coast. Unlike other members of the ILB fleet, the D-class does not have a rigid hull; all others, with the exception of the Arancia, hovercraft, and ALB Tenders, are
Rigid Inflatable Boats (RIBs). The D-class normally had a crew of three or four and was primarily used for surfer/swimmer incidents as well as assisting in cliff incidents where the casualty was near the water. The very nature of its work required a swift response, All of the following fleet details are referenced to the 2026 Lifeboat Enthusiast Society Handbook, with information retrieved directly from RNLI records. ==Fleet==