The D-class (Avon S650) lifeboat was a sub-class of 4

inflatable boat An inflatable boat is a lightweight boat constructed with its sides and bow made of flexible tubes containing pressurised gas. For smaller boats, the floor and hull is often flexible, while for boats longer than , the floor typically consists ...

s operated as part of the D-class between 1971 and 1986 by the

Royal National Lifeboat Institution The Royal National Lifeboat Institution (RNLI) is the largest charity that saves lives at sea around the coasts of the United Kingdom, the Republic of Ireland, the Channel Islands, and the Isle of Man, as well as on some inland waterways. It i ...

of the

United Kingdom The United Kingdom of Great Britain and Northern Ireland, commonly known as the United Kingdom (UK) or Britain, is a country in Europe, off the north-western coast of the European mainland, continental mainland. It comprises England, Scotlan ...

and

Ireland Ireland ( ; ga, Éire ; Ulster Scots dialect, Ulster-Scots: ) is an island in the Atlantic Ocean, North Atlantic Ocean, in Northwestern Europe, north-western Europe. It is separated from Great Britain to its east by the North Channel (Grea ...

. It was superseded by the D-class lifeboat (Zodiac III).

Utilization

There were only 4 Avon S650 utilised by the RNLI as part of the D-class, the workhorse of the RNLI inshore lifeboat (rescue) (ILB) fleet. Significantly smaller in comparison to the rest of the inshore fleet, the D-class is also one of the few RNLI types not to feature a rigid hull. The main aspect of the boat would be both its size and weight, the D-class was specifically designed as a light and highly manoeuvrable rapid response craft.

Design and construction

The D-class lifeboat consists of two

sponson Sponsons are projections extending from the sides of land vehicles, aircraft or watercraft to provide protection, stability, storage locations, mounting points for weapons or other devices, or equipment housing. Watercraft On watercraft, a spo ...

s, together housing four inflatable segments intersected by baffles. This was one of the smaller classes of lifeboat operated by the RNLI, and while there were only 4 Avon S650s in the fleet, the D-class 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 Boat 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 i ...

s (RIBs).

Fleet

References

External links

RNLI FleetRNLI Lifeboats
{{DEFAULTSORT:D-class lifeboat Royal National Lifeboat Institution lifeboats Inflatable boats