| Category | Formula One | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Constructor | Ligier | ||||||||
| Designer(s) | Gérard Ducarouge (Technical Director) Michel Beaujon (Chief Designer) Robert Choulet (Head of Aerodynamics) | ||||||||
| Predecessor | JS5 | ||||||||
| Successor | JS9 | ||||||||
| Technical specifications[1] | |||||||||
| Chassis | Aluminium monocoque | ||||||||
| Axle track | Front: 1,536 mm (60.5 in) Rear: 1,600 mm (63 in) | ||||||||
| Wheelbase | 2,608 mm (102.7 in) | ||||||||
| Engine | Matra MS76, 2,993 cc (182.6 cu in), 60° V12, NA, mid-engine, longitudinally mounted | ||||||||
| Transmission | Hewland 2-200 TL 6-speed manual | ||||||||
| Weight | 580 kg (1,280 lb) | ||||||||
| Fuel | Shell | ||||||||
| Tyres | Goodyear | ||||||||
| Competition history | |||||||||
| Notable entrants | Ligier Gitanes | ||||||||
| Notable drivers |  Jacques Laffite Jean-Pierre Jarier | ||||||||
| Debut | 1977 Argentine Grand Prix | ||||||||
| First win | 1977 Swedish Grand Prix | ||||||||
| Last win | 1977 Swedish Grand Prix | ||||||||
| Last event | 1978 Swedish Grand Prix | ||||||||
| |||||||||
| Constructors' Championships | 0 | ||||||||
| Drivers' Championships | 0 | ||||||||
The Ligier JS7 was the second Formula One racing car made by Ligier. As with the preceding JS5, the letters "JS" were in tribute to Guy Ligier's friend Jo Schlesser who was killed in the 1968 French Grand Prix.
Aside from using the Matra V12 rather than the usual Ford Cosworth unit, the JS7 was a very conventional design with a Hewland six-speed transmission and a longitudinally mounted engine and wishbone suspension. The JS7 forwent the giant air intake of the preceding JS5.[2] The front wing design echoed that of the Ferrari 312T.
The JS7 competed in the 1977 Formula One season and the first two races of the 1978 season. An updated version, dubbed the JS7/9 was used for three races in 1978 until the definitive 1978 car, the JS9 was ready. Laffite's victory in the 1977 Swedish Grand Prix was the first all-French victory - chassis, engine and driver - in World Championship history.[3]
(key)
| Year | Chassis | Engine | Tyres | Drivers | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | Points | WCC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1977 | JS7 | Matra V12 | G | ARG | BRA | RSA | USW | ESP | MON | BEL | SWE | FRA | GBR | GER | AUT | NED | ITA | USA | CAN | JPN | 18 | 8th | |
| Jacques Laffite | NC | Ret | Ret | 9 | 7 | 7 | Ret | 1 | 8 | 6 | Ret | Ret | 2 | 8 | 7 | Ret | 5 | ||||||
| Jean-Pierre Jarier | Ret | ||||||||||||||||||||||
| 1978 | JS7 | Matra V12 | G | ARG | BRA | RSA | USW | MON | BEL | ESP | SWE | FRA | GBR | GER | AUT | NED | ITA | USA | CAN | 19* | 6th | ||
| Jacques Laffite | 16 | 9 | 5 | ||||||||||||||||||||
| JS7/9 | 5 | 5 | 7 |
* 13 points scored using the JS9.
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