Engineering:Fowler Challenger III amphibious tractor

Short description: RNLI Amphibious launch tractor

Fowler Challenger III
Fowler tractor T65 (VYT 878) RNLI Heritage Collection, Chatham
Type	Launch vehicle
Manufacturer	John Fowler & Co.
Production	13 (1952–1960)
Weight	14 tonnes with track pads
Propulsion	tracks
Engine model	Meadows 6 DC630 95 h.p.
Gross power	95 hp (71 kW)
Drawbar pull	17 tonnes

Fowler Challenger III is a continuous track amphibious launch tractor, which was specifically designed for the Royal National Lifeboat Institution (RNLI), to launch and recover carriage mounted lifeboats, from beach-launched lifeboat stations.

Fowler Challenger III Crawler Tractor
Mick Bell

A total of 13 tractors were constructed over a seven-year period from 1953 to 1960. The tractor is a highly modified version of the standard 95 bhp Fowler Challenger III diesel crawler tractor, manufactured by John Fowler & Co. of Leeds.

A prototype was trialled successfully at Template:Lbs in 1952

The tractor developed a draw-bar pull of 21,100 Lbs, through its six-speed gearbox, and was fitted with a specially designed winch, allowing it to exert a maximum pull of 38,500 Lbs. at its lowest speed. Extended gear and clutch levers were fitted, to assist the driver when submerged.

The tractor has been made completely watertight, with the engine compartment sealed with watertight panels and doors. The engine was designed to run for long periods without overheating. Circular brass rubber-seated valves were fitted to the air intake and discharge ports, to be closed when submerged. To prevent damage, an automatic stop device was also employed.

There were many requirements of the RNLI variant tractor:

• Able to tow a life-boat and carriage weighing up to 14 tons over various types of terrain, including soft sand and deep shingle.
• Able to pull the life-boat and carriage up gradients of 1 in 4 and to hold them by its brakes on these gradients.
• Able to haul life-boat and carriage to the water, which at low water may be several miles at some stations.
• Capable of operating continuously at full power, in water up to a depth of seven feet.

Fowler Challenger III fleet

Op. No.	Reg No.	Built	In service	Station	Comments
T56	MYR 426	1953	1953–1960	Template:Lbs	Featured in Meccano Magazine, April 1954. Location unknown.
			1960–1962	Relief fleet
			1962–1967	Template:Lbs
			1967	Depot
			1968	Template:Lbs
			1968–1969	Depot
			1969–1977	Template:Lbs
			1977–1982	Relief fleet
			1982	Template:Lbs
			1982–1988	Template:Lbs
			1988–1989	Stored (Template:Lbs)
T57	NYE 351	1953	1953–1964	Template:Lbs	In a private collection in Tring, Hertfordshire.
			1964–1966	Relief fleet
			1966–1968	Template:Lbs
			1968–1970	Template:Lbs
			1970–1972	Template:Lbs
			1972–1974	Relief fleet
			1974	Template:Lbs
			1974–1976	Template:Lbs
			1976–1978	Depot
			1978–1983	Template:Lbs
			1983–1985	Depot
T58	OJJ 312	1953	1953–1965	Template:Lbs	Location unknown.
			1965–1974	Template:Lbs
			1974–1975	Template:Lbs
			1975–1976	Depot
	HZR 780		1976–1989	Template:Lbs
T59	OJJ 866	1954	1954–1969	Template:Lbs	Location unknown.
			1969–1971	Depot
			1971–1976	Template:Lbs
			1977–1985	Template:Lbs
T60	OXO 323	1954	1954–1962	Template:Lbs	Location unknown.
			1963–1972	Template:Lbs
			1972–1973	Depot
			1973–1974	Template:Lbs
			1974–1978	Template:Lbs
			1978–1983	Template:Lbs
			1983–1985	Template:Lbs
			1985–1989	Relief fleet
T61	PLA 561	1954	1954–1966	Template:Lbs	Restored, was offered for sale in 2022. In a private collection in Market Rasen, Lincolnshire.
			1966–1967	Relief fleet
			1967–1968	Template:Lbs
			1968–1969	Relief fleet
			1969–1975	Template:Lbs
			1975–1984	Template:Lbs
			1985–1988	Template:Lbs
			1988–1989	Relief fleet
T62	PLA 698	1954	1954–1965	Template:Lbs	On display in the Stephen Robson Collection at Chain Bridge Honey Farm, Berwick-upon-Tweed, Northumberland.
			1965–1967	Relief fleet
			1967–1976	Template:Lbs
			1976–1978	Template:Lbs
			1978–1980	Template:Lbs
			1980–1981	Relief fleet
			1981–1987	Template:Lbs
			1987–1989	Depot
T63	PXF 163	1954	1955–1963	Template:Lbs	In the John Myers Historic Vehicle Collection at Huddersfield, West Yorkshire.
			1963–1965	Relief fleet
			1965–1975	Template:Lbs
			1975–1978	Template:Lbs
			1979–1983	Template:Lbs
			1984–1988	Template:Lbs
			1988	Depot
T64	PXF 575	1955	1955–1958	Template:Lbs	In the John Myers Historic Vehicle Collection at Huddersfield, West Yorkshire.
			1958–1967	Template:Lbs
			1968–1978	Template:Lbs
			1978–1980	Relief fleet
			1980–1982	Template:Lbs
			1982–1984	Relief fleet
			1984–1986	Template:Lbs
T65	VYT 878	1958	1958–1959	Template:Lbs	On display in the RNLI Heritage Collection at Chatham Historic Dockyard.
			1959–1963	Relief fleet
			1963–1970	Template:Lbs
			1970	Template:Lbs
			1970–1972	Relief fleet
			1972–1973	Template:Lbs
			1974–1985	Template:Lbs
			1985–1990	Relief fleet
T66	XYP 400	1959	1959–1969	Template:Lbs	In a private collection in Ravensden, Bedfordshire.
			1969–1974	Template:Lbs
			1975	Template:Lbs
			1976–1986	Template:Lbs
			1986–1989	Depot
T67	YLD 792	1960	1960–1969	Template:Lbs	In a private collection in Redditch, Worcestershire, November 2024.
			1969–1972	Relief fleet
			1972–1974	Template:Lbs
			1974–1979	Template:Lbs
			1979–1982	Relief fleet
			1982–1983	Template:Lbs
			1983–1984	Template:Lbs
			1984–1985	Relief fleet
			1985–1987	Template:Lbs
			1987–1989	Depot
T68	YUV 742	1960	1960–1968	Template:Lbs	In a private collection in Tring, Hertfordshire.
			1969–1974	Template:Lbs
			1975–1978	Template:Lbs
			1978–1982	Template:Lbs
			1982–1984	Template:Lbs
			1984–1987	Relief fleet
			1987	Template:Lbs
			1987–1989	Relief fleet

See also

• New Holland TC45 launch tractor
• Talus MB-764 launch tractor
• Talus MB-H launch tractor
• Talus MB-4H launch tractor
• Talus Atlantic 85 DO-DO launch carriage