D-859The Rotarian of Filey
Class overview
Name	D-class (IB1)
Builders	Inshore Lifeboat Centre,Cowes
Operators	Royal National Lifeboat InstitutionSome Independent lifeboats
Preceded by	D-class (EA16)
Cost	£89,000
Built	2001–
In service	2003–
Completed	305 (August 2025)
General characteristics
Class & type	Inshore Boat 1
Displacement	400 kg (880 lb)
Length	5 m (16 ft)
Beam	2 m (6.6 ft)
Draught	1.4 m (4.6 ft)
Propulsion	1 × 50 hpMariner outboard engine
Speed	25knots (29 mph)
Endurance	3 hours
Capacity	8
Complement	3 or 4

TheD-class (IB1) lifeboats areinflatable boats serving in theRNLI inshore lifeboat (ILB) fleet as well as a number ofIndependent Lifeboats around the UK and Ireland. Although they are known as the "IB1" at times, they are the latest development of the D-class lifeboat and as such are mainly referred to as a "D-class".

This class of lifeboat is one of the smallest operated by the RNLI, and they are a common sight at lifeboat stations round the coast. Unlike other members of the ILB fleet, the D-class (IB1) does not have a rigid hull. All others with the exception of theArancia,hovercraft and all-weather lifeboat tenders are rigid inflatable boats.

The IB1 normally has a crew of three or four and is primarily used for surfer/swimmer incidents as well as assisting in cliff incidents where the casualty is near the water. The very nature of its work requires a swift response, and the IB1 can normally be afloat very quickly.

As of February 2020 the minimum crew for an RNLI IB1 was raised from 2 to 3. Some Independent Lifeboats have different crewing levels to the RNLI.

All of the following fleet details are referenced to the 2026 Lifeboat Enthusiast Society Handbook, with information retrieved directly from RNLI records.^[1]

Wikimedia Commons has media related toIB1 class lifeboats.

• RNLI D-class

• D-class lifeboats

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• Use British English from February 2018
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