Cooper T81

Cooper T81
	Jo Bonnier's Cooper T81, in the colours of his Anglo-Suisse Racing team
Category	Formula One
Constructor	Cooper Car Company
Designer(s)	Derrick White
Predecessor	Cooper T77/Cooper T80
Successor	Cooper T86
Technical specifications
Chassis	Aluminium monocoque
Suspension (front)	lower wishbones, upper rocker arms, inboard coil springs over dampers
Suspension (rear)	top links, reversed lower wishbones, twin radius arms, coil springs over dampers
Axle track	F: 1,495 mm (58.9 in); R: 1,455 mm (57.3 in)
Wheelbase	2,490 mm (98.0 in)
Engine	Maserati 2989cc V12 naturally aspirated Mid-engined, longitudinally mounted
Transmission	T81: ZF 5DS25; T81B: Hewland DG300 5-speed manual gearbox,
Fuel	BP
Tyres	(Works team) Dunlop (1966),; Firestone (1966/7)
Competition history
Notable entrants	Cooper Car Company, R.R.C. Walker Racing Team
Notable drivers	Chris Amon,; Jo Bonnier,; Richie Ginther,; Jochen Rindt,; Pedro Rodríguez,; Jo Siffert,; John Surtees, ; Jacky Ickx
Debut	1966 Syracuse Grand Prix
Constructors' Championships	0
Drivers' Championships	0

The Cooper T81 is a Formula One car produced by the Cooper Car Company for the 1966 Formula One season. It represented something of a comeback for Cooper's fortunes, winning two races and enabling Cooper to finish third in the Constructors' Championship in 1966 and 1967.^[1]^[2]

Development

The T81 was designed ahead of the 1966 World Championship season to operate within the new 3 litre engine regulations that came into effect that year. It would be powered by Maserati's Tipo 9 2.5-litre V12 engines which had been bored out to 3 litres. These were supplied by the Chipstead Group, Maserati's UK distributors, who had taken control of Cooper in April 1965.^[3] Cooper had tested the engine in the interim T80 model.

In many ways the T81 was a typical example of its time, with a rear engine, front radiator, inboard front suspension and a monocoque chassis. In fact the car was Cooper's first monocoque chassis, although by this time such an arrangement had already become standard in Formula 1, having been pioneered by the Lotus 25 four years earlier. The T81 made its race debut in the 1966 Syracuse Grand Prix.^[4]

Strenuous efforts were made to save weight for the 1967 season; this lighter car was dubbed the T81B.^[5]

Race history

The T81 debuted at the non-championship 1966 Syracuse Grand Prix. The works team was not present but Rob Walker entered a car for Jo Siffert and Guy Ligier entered his own car. Siffert qualified third but retired with a broken universal joint, while Ligier qualified fifth and finished sixth and last.

The World Championship debut was at the 1966 Monaco Grand Prix. Jochen Rindt and Richie Ginther were the works drivers, qualifying in seventh and ninth position respectively. Both retired with mechanical problems. Guy Ligier and Jo Bonnier were also present and finished the race but were unclassified.

With up to three works entries, and three privateer cars, there were suggestions that Cooper were overstretching themselves and that as a result the preparation of the cars was suffering. However John Surtees, who had replaced Ginther after walking out on Ferrari, took the car's first win in the final race of the 1966 season in Mexico, and in turn Surtees's replacement, Pedro Rodríguez, won the very next race, the 1967 season opener in South Africa. The T81B variant was first raced by Rindt at the 1967 Monaco Grand Prix.

Cooper finished third in the Constructors' Championship in 1966 and 1967, their highest placing since 1962, but it would be their last flourish.

The T81's last race came at the start of the 1968 season in South Africa in the hands of privateers Jo Siffert and Jo Bonnier, as by this time the works team had moved on to the T86 chassis. As it happened, Cooper folded at the end of the 1968 season, making the T81 the last Cooper to win a World Championship Grand Prix.

In all the T81 (and T81B) was entered a total of 85 times in its 21 race lifespan, achieving 2 wins, 1 pole position, 6 podiums, and 23 points finishes, earning 74 points in total.

Complete Formula One World Championship results

Year	Entrant	Engine	Tyres	Driver	1	2	3	4	5	6	7	8	9	10	11	12	Points	WCC
1966	Cooper Car Company	Maserati V12	D		MON	BEL	FRA	GBR	NED	GER	ITA	USA	MEX				30 (35)	3rd
				Jochen Rindt	Ret	2	4	5	Ret	3	4	2	Ret
				Richie Ginther	Ret	5
				Chris Amon			8
				John Surtees			Ret	Ret	Ret	2	Ret	3	1
				Moisés Solana									Ret
	R.R.C. Walker Racing Team			Jo Siffert		Ret	Ret	NC	Ret		Ret	4	Ret
	Guy Ligier			Guy Ligier	NC	NC	NC	10	9	DNS
	Anglo-Suisse Racing Team		F	Jo Bonnier	NC	Ret			7	Ret	Ret	NC	6
1967	Cooper Car Company	Maserati V12	F		RSA	MON	NED	BEL	FRA	GBR	GER	CAN	ITA	USA	MEX		28	3rd
				Pedro Rodríguez	1	5	Ret	9	6	5	11				6
				Jochen Rindt	Ret	Ret	Ret	4	Ret			Ret		Ret
				Alan Rees						9
				Richard Attwood								10
				Jacky Ickx									6
	Rob Walker Racing Team			Jo Siffert	Ret	Ret	10	7	4	Ret	Ret	DNS	Ret	4	12
	Joakim Bonnier Racing Team			Jo Bonnier	Ret			Ret		Ret	6	8	Ret	6	10
	Guy Ligier			Guy Ligier				10	NC
1968	Cooper Car Company	Maserati V12	F		RSA	ESP	MON	BEL	NED	FRA	GBR	GER	ITA	CAN	USA	MEX	0	NC
	Cooper Car Company			Brian Redman	Ret
	Rob Walker Racing Team			Jo Siffert	7
	Joakim Bonnier Racing Team			Jo Bonnier	Ret

References

^ "Stats F1 1966".
^ "Stats F1 1967".
^ "Cooper T81 Maserati". Retrieved 29 August 2022.
^ "Cooper T81 history". Retrieved 29 August 2022.
^ "Cooper T81B history". Retrieved 29 August 2022.

[1] "Stats F1 1966".

[2] "Stats F1 1967".

[3] "Cooper T81 Maserati". Retrieved 29 August 2022.

[4] "Cooper T81 history". Retrieved 29 August 2022.

[5] "Cooper T81B history". Retrieved 29 August 2022.

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