Liverpool-class lifeboat

Former Clovelly, twin engined RNLB William Cantrell Astley (ON 871)
Class overview
Builders	Groves & Guttridge, Cowes Thorneycroft, Chiswick J. Samuel White, Cowes Saunders-Roe, Cowes Morgan Giles, Teignmouth Rowhedge Ironworks, Rowhedge
Operators	Royal National Lifeboat Institution
Succeeded by	Oakley
Built	Single engine: 1931–1941 Twin engine: (1940), 1945–1954
In service	1931–1984
Completed	Single engine: 28 Twin engine: 32
Retired	60
General characteristics
Type	Motor lifeboat
Displacement	6-8 tons
Length	35 ft 6 in (10.82 m)
Propulsion	Single engine: 35 hp (26 kW) Weyburn AE6 Petrol Twin engine: 2 x 18 hp (13 kW) Weyburn AE4 Petrol/20 hp (15 kW) Ferry Kadenacy FKR3 Diesel
Speed	6.5–7.5 knots (12.0–13.9 km/h; 7.5–8.6 mph)
Range	70–120 nautical miles (130–220 km; 80–140 mi)
Crew	7

The Liverpool-class motorised lifeboat was a non-self-righting boat operated by the Royal National Lifeboat Institution (RNLI) from its stations around the coast of the United Kingdom and Ireland. The boats were designed for carriage launching and were developed from the Liverpool-Class Pulling and Sailing type of lifeboats - there were two types built, single and twin engined.