46ft 9in Watson-class Lifeboat
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The 46 ft 9in Watson-class lifeboat was a non self-righting
displacement hull A hull is the watertight body of a ship, boat, submarine, or flying boat. The hull may open at the top (such as a dinghy), or it may be fully or partially covered with a deck. Atop the deck may be a deckhouse and other superstructures, such as a ...
lifeboat built between 1947 and 1956 and operated by the
Royal National Lifeboat Institution The Royal National Lifeboat Institution (RNLI) is the largest of the lifeboat (rescue), lifeboat services operating around the coasts of the United Kingdom, Republic of Ireland, Ireland, the Channel Islands, and the Isle of Man, as well as on s ...
between 1947 and 1989.


History

After the final three 46ft Watson-class boats had been completed in 1945/6, production switched to the slightly longer 46 ft 9in type in 1947. The first five boats were very similar in appearance to the final 46 ft types, with
aft This list of ship directions provides succinct definitions for terms applying to spatial orientation in a marine environment or location on a vessel, such as ''fore'', ''aft'', ''astern'', ''aboard'', or ''topside''. Terms * Abaft (prepositi ...
cockpit A cockpit or flight deck is the area, on the front part of an aircraft, spacecraft, or submersible, from which a pilot controls the vehicle. The cockpit of an aircraft contains flight instruments on an instrument panel, and the controls th ...
s, turtle shaped shelters and funnel exhausts. In 1948, however, the deck and superstructure layout was completely redesigned. A new
aluminium Aluminium (or aluminum in North American English) is a chemical element; it has chemical symbol, symbol Al and atomic number 13. It has a density lower than that of other common metals, about one-third that of steel. Aluminium has ...
structure featured an open midships cockpit, with a large cabin aft of the cockpit and a smaller cabin forward which gave access to the engine room.


Description

The wooden hulled 46 ft 9in Watson-class was built in two different variations, with the first five closely resembling the preceding 46 ft type. From 1948 the design was completely revised to provide a midships steering position in an open cockpit. There was a large aft survivor cabin which also housed the radio. At the rear of this cabin was a small aft cockpit with a hatch for stretchers to be passed in and an emergency helm position. A smaller forward cabin gave access to the engine room and contained the engine controls. The boats were powered by the same twin 40 bhp Ferry VE4 installation as the earlier boats, but the exhaust was taken up the foremast to outlets well above the deck. The 46 ft 9in Watsons had long lives and were updated through their careers. The first major modification was the enclosing of the cockpit, done to all boats from 1960 onwards. The wheelhouse fitted resembled that of the 47ft Watson but there was no room to install sliding doors, weather shields being installed instead.
Radar Radar is a system that uses radio waves to determine the distance ('' ranging''), direction ( azimuth and elevation angles), and radial velocity of objects relative to the site. It is a radiodetermination method used to detect and track ...
was later installed on the wheelhouse roof and the original
aerial rigging Aerial rigging is a specialty within the field of rigging that deals specifically with human loads. Aerial rigging is the process of setting up equipment used to make humans fly, specifically aerial circus and aerial dance equipment. Aerial riggi ...
and the aft mast was removed and replaced by pole aerials. Most, but not all, of the boats were re-engined with various examples of Ford-based 6-cylinder
diesel engine The diesel engine, named after the German engineer Rudolf Diesel, is an internal combustion engine in which Combustion, ignition of diesel fuel is caused by the elevated temperature of the air in the cylinder due to Mechanics, mechanical Compr ...
s as described below. Finally, from the early 1980s all of the midships steering types (except ON 908, lost in the Fraserburgh disaster) were fitted with an air bag on the aft cabin roof to give a once only self-righting capability.


Engines

The 46 ft 9in Watsons were the final boats to be equipped with RNLI designed engines. The 42ft Watson-class, introduced in 1954 was the first type to use commercially available engines, followed by the 47ft Watson-class in 1955 and the 52 ft Barnett-class Mk.II in 1957. These all used the
Gardner Gardner may refer to: People and fictional characters *Gardner (given name) *Gardner (surname) Places United States * Gardner, Colorado *Gardner, Illinois *Gardner, Kansas *Gardner, Massachusetts * Gardner, North Dakota * Gardner, Tennessee * Ga ...
LW engine in four, five and six cylinder forms respectively. The Gardner engines were too large and heavy for the earlier types and were only ever used in new build boats. However, in the mid 1950s
Ford Ford commonly refers to: * Ford Motor Company, an automobile manufacturer founded by Henry Ford * Ford (crossing), a shallow crossing on a river Ford may also refer to: Ford Motor Company * Henry Ford, founder of the Ford Motor Company * Ford F ...
had introduced new 4- and 6-cylinder diesel engines for their
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light truck and coach chassis. These soon attracted the attention of marine engine companies and many marinized versions were on the market. In 1961 the RNLI re-engined a , ON 803, with 4-cylinder Ford-based Parsons Marlins and in 1963 a programme of re-engining s and other boats with Parsons Porbeagles began. This 4-cylinder engine was adopted for the 37 ft Oakley-class from 1964 onwards. The 6-cylinder version was small and light enough to replace the 4-cylinder Ferry VE4 engines and, after a trial installation in ON 803 in 1963, a programme of re-engining some s began in 1965. This was extended to the 46 ft 9in Watsons and in 1965 two boats (ON 852 and ON 908 ) were re-engined with these 6-cylinder Ford-based Parsons Barracuda diesels. Rated at 65 bhp, these gave a 62½% power increase, making the boats more powerful than the newer 47 ft Watsons, and between 1965 and 1968, seven boats were re-engined with Barracudas. In 1969/70, four boats received another 6-cylinder Ford based unit, the Watermota Sea Lion, rated at 70 bhp. From 1971, seven boats were equipped with 70 bhp Ford Thorneycroft 380s, the last as late as 1982, while in 1972 three boats received 70 bhp Ford Mermaid 595s. A feature of all of these re-engining programmes was the replacement of the foremast exhaust system by outlets on each side of the hull, similar to the 37 ft Oakleys. This allowed a slimmer, lighter foremast to be fitted. The exhaust system on some boats like the Howard Marryat remained unchanged .


Fleet


Aft cockpit type


Midship steering cabin type


References


External links


RNLI
{{RNLI lifeboat classes *