Cooper T73

The Cooper T73 is a 1.5-litre Formula One car, designed, developed and produced by Cooper Cars for the 1964 Formula One season.

Cooper T73

Category	Formula One
Constructor	Cooper Car Company
Designer(s)	Owen Maddock
Predecessor	Cooper T66
Successor	Cooper T77
Technical specifications
Chassis	Steel spaceframe with partial stressed panels
Suspension (front)	Double wishbone, inboard coil spring and damper
Suspension (rear)	Lower wishbone, upper trailing arm and transverse link, coil spring and damper
Engine	Coventry Climax FWMV 1.5-litre V8, naturally aspirated, rear mid, longitudinally mounted.
Transmission	Cooper 6-speed manual gearbox.
Tyres	Dunlop
Competition history
Notable entrants	Cooper Car Company
Notable drivers	Bruce McLaren Phil Hill Jochen Rindt
Debut	1964 Monaco Grand Prix
Races Wins Podiums F/Laps 21 0 2 0

Development

Bruce McLaren had persuaded Cooper to build a car, the T70, for the 1964 Tasman Series. It was based on the 1963 T66, and the T73 in turn was based on the T70. Consequently it still had a tubular steel chassis, but with additional stressed steel panels welded to the floor and sides. Front suspension was by double wishbones and inboard spring/dampers connected by rocker arms. At the rear there was a lower wishbone and a trailing arm connected to an upper link. The Tasman car had a small fuel tank for the shorter Tasman races, so the T73 had additional pannier tanks. As before, the Climax FWMV V8 supplied the power through a Cooper six-speed gearbox.

Racing history

The T73 was driven by Bruce McLaren and Phil Hill in 1964, debuting at the Monaco Grand Prix. McLaren's car broke a wishbone in practice and he drove the previous year's T66 in the race, while Phil Hill retired with suspension failure. Thereafter, it was another season of disappointment, with McLaren's best results being second place in Belgium and Italy. He finished seventh in the World Championship. Hill had an even worse season, scoring a solitary one point and managing to crash both his T73 and the spare T66 in Austria, resulting in his temporary sacking by John Cooper, which resulted in him sitting out the Italian Grand Prix, replaced by John Love. The season ended with Cooper fifth in the Constructors' Championship.

McLaren and new teammate Jochen Rindt raced the T73 at the 1965 South African Grand Prix, after which it was replaced by the T77, although Rindt resorted to the spare T73 at the Italian Grand Prix when he bent a valve in his main car. One of the works cars was later sold to J.A. Pearce Engineering who fitted it with a Ferrari GTO 3-litre V12 and entered it in several races in 1966 and 1967 for Chris Lawrence. It was not particularly successful although it

A derivative hybrid version, called the T71/73, was a mix between the T73 and the Formula 2 T71 chassis, powered by a 1.5 litre Ford Twin-Cam engine and built by Bob Gerard Racing and entered in the British Grand Prix in 1964 and 1965.^{[1][2][3][4][5]}

Formula One World Championship results

Year	Entrant	Chassis	Engine	Tyres	Drivers	1	2	3	4	5	6	7	8	9	10	WCC	Points
1964	Cooper Car Company	T73	Climax FWMV 1.5 V8	D		MON	NED	BEL	FRA	GBR	GER	AUT	ITA	USA	MEX	5th	16
					Phil Hill	9	8	Ret	7	6	Ret			Ret	9
					Bruce McLaren		7	2	6	Ret	Ret	Ret	2	Ret	7
					John Love								DNQ
	Bob Gerard Racing	T71/73	Ford 109E 1.5 L4		John Taylor					14						NC	0
1965	Cooper Car Company	T73	Climax FWMV 1.5 V8	D		RSA	MON	BEL	FRA	GBR	NED	GER	ITA	USA	MEX	5th	14
					Bruce McLaren	5
					Jochen Rindt	Ret							8
	Bob Gerard Racing	T71/73	Ford 109E 1.5 L4		Alan Rollinson					DNS						NC	0
1966	J.A. Pearce Engineering	T73	Ferrari Tipo 168 3.0 V12	D		MON	BEL	FRA	GBR	NED	GER	ITA	USA	MEX		NC	0
					Chris Lawrence				11		Ret

Formula One Non-Championship results

Year	Entrant	Chassis	Engine	Tyres	Drivers	1	2	3	4	5	6	7	8
1964	Cooper Car Company	T73	Climax FWMV 1.5 V8	D		DMT	NWT	SYR	AIN	INT	SOL	MED	RAN
					Bruce McLaren				Ret	15
	Bob Gerard Racing	T71/73	Ford 109E 1.5 L4		John Taylor		7		5	10
1965	Bob Gerard Racing	T71/73	Ford 109E 1.5 L4	D		ROC	SYR	SMT	INT	MED	RAN
					John Rhodes	11		8	Ret
					Piers Courage					DNQ
1966	J.A. Pearce Engineering	T73	Ferrari Tipo 168 3.0 V12	D		RSA	SYR	INT	OUL
					Chris Lawrence				5
1967	J.A. Pearce Engineering	T73	Ferrari Tipo 168 3.0 V12	D		ROC	SPC	INT	SYR	OUL	ESP
					Chris Lawrence	8
					Robin Darlington			WD