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Williams FW

Iso-Marlboro IR
Iso-Marlboro FW
Williams FW
Van Lennep at 1974 Dutch Grand Prix (3).jpg
Gijs van Lennep in the Iso-Marlboro FW at the 1974 Dutch Grand Prix
Category Formula One
Constructor Iso-Marlboro/Williams
Designer(s) John Clarke
Predecessor Iso-Marlboro FX3B
Successor Williams FW04
Technical specifications
Chassis Aluminium monocoque, with engine as a fully stressed member.
Engine Ford Cosworth DFV 2,993 cc (182.6 cu in) 90° V8, naturally aspirated, mid-mounted.
Transmission Hewland FG 400 5-speed Manual.
Weight 576 kg (1,269.9 lb)
Fuel FINA
Lubricants FINA
Tyres Firestone (1973–1974)
Goodyear (1975)
Competition history
Notable entrants Frank Williams Racing Cars
Notable drivers Italy Arturo Merzario
New Zealand Howden Ganley
France Jacques Laffite
Netherlands Gijs van Lennep
Debut 1973 Spanish Grand Prix
Races Wins Poles F.Laps
39 0 0 0
n.b. Unless otherwise stated, all data refer to
Formula One World Championship Grands Prix only.

The Williams FW was a Formula One car used by Frank Williams Racing Cars during the 1973, 1974 and 1975 seasons. It was designed by John Clarke.

The car was initially designated in 1973 as the Iso-Marlboro IR and two examples started the season. One was destroyed in an accident at the 1973 German Grand Prix, and a replacement was built. When Marlboro and Italian sports car manufacturer Iso both withdrew their backing before the 1974 season, the two cars were renamed for 1974 as the Iso-Marlboro FW. Another example was completed during the 1974 season. These three surviving cars were renamed as Williams cars for 1975, and carried separate designations: FW01, FW02 and FW03, although the cars were of the same type.

As Williams' current chassis, the Iso-Marlboro FX3B, did not conform to 1973's new deformable structure regulations, a new car had to be designed. The result was the IR (the initials standing for Iso Rivolta), designed by John Clarke. Another conventional design, it featured double wishbone front suspension with upper and lower links at the rear, and outboard springs all round. The car's lines were angular except for the rounded cockpit. Italian engineer Gian Paolo Dallara was brought into the team to redesign the rear suspension during the 1973 season.Ron Tauranac also made some development changes later in the season.

The FX3B was used for the first three races of the 1973 season, and had been driven by New Zealander Howden Ganley and Italian Nanni Galli, although Jackie Pretorius had filled in at the South African Grand Prix when Galli was injured. The new IR appeared at the fourth race of the season, the Spanish Grand Prix, with Ganley and the returning Galli at the wheel. Qualifying on the last two rows of the grid, the Italian finished 11th while Ganley retired when he ran out of fuel. Both drivers retired in Belgium, through an engine failure for Galli and an accident for Ganley when his throttle stuck. Both drivers retired with half-shaft failures at the Monaco Grand Prix, although Ganley had qualified tenth fastest, and after the race Galli left the team and announced his retirement from Formula One.


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