Barnett-class lifeboat

	RNLB William and Kate Johnston (ON 682)
Class overview
Builders	J Samuel White, Cowes; S. E. Saunders, Cowes; Saunders-Roe, Cowes; Groves & Guttridge, Cowes; Rowhedge Ironworks, Rowhedge;
Operators	Royal National Lifeboat Institution
Built	60 ft: 1923–1929; 51 ft: 1928–1949; 52 ft Mk. I: 1950–1955; 52 ft Mk. II: 1957–1960;
In service	1923–1987
Completed	60 ft: 4; 51 ft: 13; 52 ft Mk. I: 10; 52 ft Mk. II: 10;
Retired	37
General characteristics
Type	Motor lifeboat
Displacement	60 ft: 40–44 tons; 51 ft: 27 tons; 52 ft: 28 tons;
Length	51–60 ft (16–18 m)
Beam	60 ft: 15 ft (4.6 m); 51 ft: 13 ft 6 in (4.11 m); 52 ft Mk. I: 13 ft 6 in (4.11 m); 52 ft Mk. II: 14 ft (4.3 m);
Installed power	60 ft:2 x 80 bhp D.E. 6-cyl. petrol; 51 ft: 2 x 60 bhp Weyburn CE6 6-cyl. petrol; 52 ft Mk. I: 2 x 60 bhp Ferry VE6 6-cyl. diesel; 52 ft Mk. II: 2 x 72 bhp Gardner 6LW 6cyl. diesel;
Propulsion	2 × pitch propellers in tunnels
Speed	9.5 knots (10.9 mph; 17.6 km/h)
Range	300 nautical miles (350 mi; 560 km)
Crew	6

The Barnett-class lifeboat consists of three types of non self-righting displacement hull lifeboats operated by the Royal National Lifeboat Institution (RNLI) from its stations around the coasts of the United Kingdom and Ireland between 1923 and 1987.

Class overview
RNLB William and Kate Johnston (ON 682)
Builders	J Samuel White, Cowes S. E. Saunders, Cowes Saunders-Roe, Cowes Groves & Guttridge, Cowes Rowhedge Ironworks, Rowhedge
Operators	Royal National Lifeboat Institution
Built	60 ft: 1923–1929 51 ft: 1928–1949 52 ft Mk. I: 1950–1955 52 ft Mk. II: 1957–1960
In service	1923–1987
Completed	60 ft: 4 51 ft: 13 52 ft Mk. I: 10 52 ft Mk. II: 10
Retired	37
General characteristics
Type	Motor lifeboat
Displacement	60 ft: 40–44 tons 51 ft: 27 tons 52 ft: 28 tons
Length	51–60 ft (16–18 m)
Beam	60 ft: 15 ft (4.6 m) 51 ft: 13 ft 6 in (4.11 m) 52 ft Mk. I: 13 ft 6 in (4.11 m) 52 ft Mk. II: 14 ft (4.3 m)
Installed power	60 ft:2 x 80 bhp D.E. 6-cyl. petrol 51 ft: 2 x 60 bhp Weyburn CE6 6-cyl. petrol 52 ft Mk. I: 2 x 60 bhp Ferry VE6 6-cyl. diesel 52 ft Mk. II: 2 x 72 bhp Gardner 6LW 6cyl. diesel
Propulsion	2 × pitch propellers in tunnels
Speed	9.5 knots (10.9 mph; 17.6 km/h)
Range	300 nautical miles (350 mi; 560 km)
Crew	6