Lotus 91

Lotus 91

Category	Formula One
Constructor	Lotus
Designer(s)	Colin Chapman Martin Ogilvie
Predecessor	87B
Successor	92
Technical specifications[2]
Chassis	Carbon fibre and Kevlar monocoque
Engine	Cosworth DFV, 2,993 cc (182.6 cu in), 90° V8, NA, mid-engine, longitudinally mounted
Transmission	Lotus / Hewland 5-speed manual
Fuel	Valvoline
Tyres	Pirelli Goodyear
Competition history
Notable entrants	John Player Team Lotus
Notable drivers	11. Elio de Angelis 12. Nigel Mansell 12. Roberto Moreno 12. Geoff Lees
Debut	1982 Brazilian Grand Prix
Races Wins Podiums Poles F.Laps 15 1 2 0 0
Constructors' Championships	0
Drivers' Championships	0

The Lotus 91 was a car used by the English team Lotus in the 1982 Formula One season, designed by Colin Chapman, Martin Ogilvie and Tony Rudd. After several uncompetitive seasons with experimental or mediocre cars, Colin Chapman went back to basics and designed the graceful Lotus 91, based in part on the Williams FW07 and Lotus' own 88 design. Powered by the Ford Cosworth DFV, and using a standard Hewland gearbox, the 91 was uncomplicated and easy to maintain. Following Brabham's lead, the new car was the first Lotus chassis to use carbon brakes, improving braking performance considerably.

After a design study by Chapman into new composite materials, the decision was taken to build the car in carbon fibre, making it after the McLaren MP4/1 the second F1 car to race to be built from the material - the Lotus 86/88 not having raced because it was banned.

Under the direction of Peter Warr, the team worked hard to make the car as competitive as possible. The lightweight chassis gave the 91 a fighting chance against the far more powerful turbo engined cars, and Cosworth worked on a short stroke version of the DFV purely for Lotus' use. The suspension was revolutionary. Using an on-board system to control the ride height and behavior of the suspension, the Lotus 91 was the first car to be fitted with active suspension. The system was partially controlled by computers, but at this early stage was mostly operated by hydro-pneumatic valves. Elio de Angelis used the car well, but found the 91 was mostly competitive on ultra fast tracks like Hockenheim, Monza and the Österreichring. The latter track provided a thrilling final lap win for De Angelis against Keke Rosberg in the Williams. That as well as several other podium places helped the team to fifth in the final standings in 1982, before ground effects were banned for the 1983 Formula One season, and the 91 was replaced by the first Lotus turbo car. The 91 was the last Lotus F1 car to win a race under Colin Chapman's rule before he died of a heart attack on 16 December 1982.

The Lotus 91 without front wing

Complete Formula One results

(key)

Year	Team	Engine	Tyres	Drivers	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	Pts.	WCC
1982	John Player Team Lotus	Cosworth DFV V8 NA	G		RSA	BRA	USW	SMR	BEL	MON	DET	CAN	NED	GBR	FRA	GER	AUT	SUI	ITA	CPL	30	5th
				Nigel Mansell		3	7		Ret	4	Ret	Ret		Ret		9	Ret	8	7	Ret
				Elio de Angelis		Ret	5		4	5	Ret	4	Ret	4	Ret	Ret	1	6	Ret	Ret
				Roberto Moreno									DNQ
				Geoff Lees											12

References

1. MACARONI ammonite: interview with Shunsaku Tamiya - in Japanese
2. http://www.statsf1.com/en/lotus-91.aspx