Category | Sports prototype | ||||||||
---|---|---|---|---|---|---|---|---|---|
Constructor | Alan Mann Racing | ||||||||
Designer(s) | Len Bailey | ||||||||
Technical specifications | |||||||||
Chassis | Aluminium monocoque, with steel bulkheads | ||||||||
Suspension (front) | Double wishbone | ||||||||
Suspension (rear) | Single top link with reversed lower wishbone and twin trailing arms | ||||||||
Engine | Ford-Cosworth DFV 2993cc 90° V8, naturally aspirated, mid mounted | ||||||||
Transmission | Hewland DG300 5-speed manual | ||||||||
Fuel | Burmah | ||||||||
Tyres | Goodyear | ||||||||
Competition history | |||||||||
Notable entrants | Alan Mann Racing | ||||||||
Notable drivers | Bruce McLaren Mike Spence Chris Irwin Jochen Rindt Pedro Rodríguez Frank Gardner Richard Attwood Denny Hulme | ||||||||
Debut | 1968 BOAC 500 Brands Hatch | ||||||||
| |||||||||
Constructors' Championships | 0 | ||||||||
Drivers' Championships | 0 |
The Ford P68, also commonly known as the Ford 3L GT or F3L, is a sports prototype racing car model introduced in March 1968. It was designed by Len Bailey, a Ford research engineer, funded by Ford Europe and built by Alan Mann Racing at Weybridge, Surrey, UK. The first competition appearance of a Ford 3L prototype was at the BOAC 500 race at Brands Hatch in Kent. It delivered a good pace, but was criticized for instability at high speeds. It did not finish any of the races in which it was entered, due to mechanical and electrical failures.
For the 1969 season the P68 was used as the basis for an aborted, fully open Spyder, dubbed the Ford P69. The P69 sported large, free-standing aerofoil wings, which were vital to the car's stability at high-speeds. However, these were banned by the European sanctioning body early in the season, thus the P68 was not eligible to race in the respective class any longer.
At the end of the 1967 season the FIA redrew the rules for sports car racing. Engine capacity was limited to 3 litres for the lightest, most advanced Group 6 sports prototype class, while a new 5 litre Group 4 Sports Car class [1] was introduced for vehicles of which at least 50 examples had been built. Ford's American headquarters organisation withdrew from sports car racing at the end of 1967, [2] leaving those teams committed to running the aging GT40 without factory support. While some teams, such as JWA, decided to go down the Group 4 Sports Car route and began work on updating the GT40, Alan Mann Racing decided to build a brand new prototype car around Ford's recently introduced 3.0L DFV V8 Formula One engine.
Raising sponsorship from Ford, as well as Burmah-Castrol and Goodyear, AMR procured the services of leading Ford aerodynamicist Len Bailey, who had designed much of the GT40's bodywork, to work on their new car.
The car was built to Group 6 regulations, with an open two-seat bodywork design. This was perhaps rather liberally interpreted, with only a small hatch in the otherwise enveloping roof being left open to the elements. [3] The hatch also allowed the driver to see the centrally mounted rear-view mirror.
One major advantage of the open prototype regulations was that they permitted a much lower roofline than otherwise would have been possible. Bailey used this to create an extremely low, long, curvaceous, aerodynamically efficient design. With a Cd of only 0.27 [2] and a frontal area of 14 ft² [3] the 3.0L engine was sufficient to push the P68 to over 350 km/h, [2] faster than contemporary Formula One cars. However, former driver Frank Gardner has criticised Bailey's pursuit of aerodynamic efficiency at the expense of driver comfort. [4] In order to keep the P68 on the road, Bailey incorporated a patented, vortex-generating tail scoop, intended to create downforce without adding to drag. However, although the car has since been shown to produce moderate downforce at speed, this is mostly over the front wheels. [2] The resultant high-speed instability led to both John Surtees and Jack Brabham refusing to drive the car. [2] [5] Over the following months the P68 sprouted ever larger rear spoilers, and small chin spoilers, in an effort to stabilise the car.
Underneath the curvaceous bodywork, the chassis was a riveted, aluminium monocoque, with steel bulkheads onto which the suspension components were mounted. [3] The DFV engine was supported in an aluminium cradle behind the driver. Unlike the Lotus 49 for which the DFV had been designed, the engine was not used as a structural chassis member. In contrast, the suspension layout was almost a direct copy of contemporary F1 practice. Contemporary observers commented on the oversized front hub components, potentially allowing the car to be converted to four-wheel drive at some point. [3] The radiator was mounted in the nose, although later enhancements to cooling resulted in a wider opening being incorporated from mid-season. Fuel was stored in two deformable cells, one in each sill.
Following poor results, during the winter of 1968 Len Bailey adapted the P68's monocoque to fully exploit the open-roof regulations. A fully open spyder prototype was produced with almost completely new bodywork panels; even lower and wider, it also included a dramatic reduction in length. [5] Mechanicals were carried over from the P68 in almost unchanged form. This new car was numbered the P69, although differences with the P68 were only skin deep. In an attempt to cure the same stability problems that afflicted the P68, the P69 had an innovative system of interconnected, hydraulically-controlled, partially automatic, adjustable aerofoil wings. [5] However, following several accidents with similar systems during Formula One races, the wings were swiftly banned by the FIA early in the season. Without wings, AMR judged that the car would require a complete redesign to be competitive with the dominant Porsches and therefore, lacking funds, the P68/P69 project was abandoned.
The first batch of cars was ready for the European season-opening BOAC 500 race, at Brands Hatch on 7 April 1968. Even this early in its career, the P68 had started to grow spoilers and air dams at its front and rear. Two cars were entered, for Bruce McLaren and Denny Hulme, and Jochen Rindt and Mike Spence. [6] However, the two cars were relatively untested, with one actually being brand new, and teething troubles beset the weekend. Although initially slow during practice, gradual tuning and tweaking meant that by the end of qualifying McLaren had managed to put in a lap fast enough to take second place on the grid, splitting the works Porsche 907s. Unfortunately, the Rindt/Spence car had suffered an engine mount failure and failed to qualify. Spence, something of a Brands Hatch specialist, was substituted into the lead car for the race, and was at the wheel, leading the race, when a rubber joint in the transmission failed, putting the car out. Although neither car had finished, the pace and performance while running looked to be promising better for the future.
This promise was never to be fulfilled. With Mike Spence's death during practice for the 1968 Indianapolis 500, fellow Brit Chris Irwin was drafted in for the P68's next race: the 1968 1000km Nürburgring. He was lucky to escape death when he lost control of his car at the Flugplatz during practice, although his injuries were severe enough for his career to be ended. The car was destroyed. [7] In the race, once again the remaining P68 failed to finish due to mechanical gremlins. This was to be the pattern during all the remaining races for which the P68 was entered during 1968. One tantalising highlight occurred when Frank Gardner, who performed much of the P68's limited developmental testing, took pole position at the 1000km Spa race. However, once again the car flattered to deceive, as it stuttered to a halt on the first lap of the race with faulty electrics. By this time the P68's faults were all too apparent, and Alan Mann Racing decided not to travel to the Zeltweg race.
For 1969 AMR intended to replace the P68 with its sister car, the P69. However, by the time of the 1969 BOAC 500 race only one P69 was ready. After trying the P69, prior to qualifying, Jack Brabham flatly refused to drive the car in anger so unstable did he find it. That left only a year-old P68 to carry the AMR flag, in the hands of Hulme and Gardner. A large, high-mounted wing was attached directly to the tops of the rear suspension towers, which went some way to reducing rear-end lift at speed, but again an engine failure stopped the car before the end of the race. The final competition outing for the Ford 3L prototype was at the AMOC Martini Trophy meeting at Silverstone. But driver Gardner never even made the grid, as rain during practice soaked the cars electrics, making it unable to start.
(key) (results in bold indicate pole position; results in italics indicate fastest lap)
Year | Entrants | Chassis | Class | Drivers | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | Points | WEMCP |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1968 | Alan Mann Racing | P68 | Group 6 | DAY | SEB | BHC | MNZ | TFO | SPA | NÜR | WGN | ZEL | LMS | 0 | - | |
Bruce McLaren | 29 | |||||||||||||||
Mike Spence | 29 | |||||||||||||||
Jochen Rindt | DNS | |||||||||||||||
Denny Hulme | PO | |||||||||||||||
Frank Gardner | 49 | 35 | 36 | DNA | ||||||||||||
Richard Attwood | 49 | DNA | ||||||||||||||
Chris Irwin | DNS | |||||||||||||||
Pedro Rodríguez | DNS | |||||||||||||||
Hubert Hahne | 35 | 36 | ||||||||||||||
1969 | Alan Mann Racing | P69 | Group 6 | DAY | SEB | BHC | MNZ | TFO | SPA | NÜR | LMS | WGN | ORC | 0 | - | |
Jack Brabham | DNS | |||||||||||||||
Frank Gardner | DNS | |||||||||||||||
P68 | 32 | |||||||||||||||
Denny Hulme | 32 | |||||||||||||||
Masten Gregory | PO | |||||||||||||||
Yr. | Event | Circuit | Drivers | Notes |
---|---|---|---|---|
1968 | BOAC 500 | Brands Hatch | Bruce McLaren Denny Hulme | DNF. Hulme replaced by Spence for race. Transmission failure. |
Mike Spence Jochen Rindt | DNS. Engine mount failed in practice. | |||
1000km Nürburgring | Nürburgring | Frank Gardner Richard Attwood | DNF. Brake failure. | |
Chris Irwin Pedro Rodríguez | DNS. Car written off in practice. | |||
RAC TT | Oulton Park | Richard Attwood | DNF. Differential failure. | |
AMOC 500 | Silverstone | Frank Gardner | DNF. Engine failure. | |
1000km Spa | Spa-Francorchamps | Frank Gardner Hubert Hahne | Pole position, DNF. Electrical failure. | |
500km Zeltweg | Zeltweg | Frank Gardner Richard Attwood | DNA. | |
n/d | DNA. | |||
1969 | BOAC 500 | Brands Hatch | Denny Hulme Masten Gregory | P68, DNF. Gregory replaced by Gardner for race. Oil pressure. |
Frank Gardner Jack Brabham | P69, DNS. Withdrawn. | |||
AMOC 300 | Silverstone | Frank Gardner | DNS. Wet electrics. |
The Ford GT40 is a high-performance mid-engined racing car originally designed and built for and by the Ford Motor Company to compete in 1960s European endurance racing. Its specific impetus was to best Scuderia Ferrari, which had won the prestigious 24 Hours of Le Mans race for six years running from 1960 to 1965. Around 100 cars have been made, mostly as 289 cu in (4.7 L) V8-powered Mk Is, some sold to private teams or as road legal Mk III cars. Racing started in 1964, with Ford winning World Championships categories from 1966 to 1968. The first Le Mans win came in 1966 with three 427 cu in (7.0 L) powered Mk.II prototypes crossing the finish line together, the second in 1967 by a similarly powered highly modified US-built Mk.IV "J-car" prototype. In order to lower ever-higher race top speeds, a rule change from 1968 onwards limited prototypes to 3.0 litre Formula 1 engines; a loophole, however, allowed the private JW "Gulf Oil" team win at Le Mans in 1968 and 1969 running a Mk.I with a 5.0 litre engines.
The DFV is an internal combustion engine that was originally produced by Cosworth for Formula One motor racing. The name is an abbreviation of Double Four Valve, the engine being a V8 development of the earlier four-cylinder FVA, which had four valves per cylinder.
The Porsche 917 is a sports prototype race car developed by German manufacturer Porsche to exploit the regulations regarding the construction of 5-litre sports cars. Powered by a Type 912 flat-12 engine which was progressively enlarged from 4.5 to 5.0 litres, the 917 was introduced in 1969 and initially proved unwieldy on the race track but continuous development improved the handling and it went on to dominate sports-car racing in 1970 and 1971. In 1970 it gave Porsche its first overall win at the 24 Hours of Le Mans, a feat it would repeat in 1971. It would be chiefly responsible for Porsche winning the International Championship for Makes in 1970 and 1971. Porsche went on to develop the 917 for Can-Am racing, culminating in the twin-turbocharged 917/30 which was even more dominant in the role. Porsche drivers would win the Can-Am championship in 1972 and 1973. 917 drivers also won the Interserie championship every year from 1969 to 1975.
Michael Henderson Spence was a British racing driver from Surrey in England. He participated in 37 Formula One World Championship Grands Prix, debuting on 8 September 1963. He achieved one podium, and scored a total of 27 championship points. He also participated in numerous non-Championship Formula One races, as well as sports car racing.
Richard James David "Dickie" Attwood is a British motor racing driver from England. During his career he raced for the BRM, Lotus and Cooper Formula One teams. He competed in 17 World Championship Grands Prix, achieved one podium and scored a total of 11 championship points. He was also a successful sports car racing driver and won the 1970 24 Hours of Le Mans race, driving a Porsche 917, the first of Porsche's record 19 victories at the famous race.
The Ferrari P was a series of Italian sports prototype racing cars produced by Ferrari during the 1960s and early 1970s.
The Lotus 49 was a Formula One racing car designed by Colin Chapman and Maurice Philippe for the 1967 F1 season. It was designed around the Cosworth DFV engine that would power most of the Formula One grid through the 1970s. It was one of the first F1 cars to use a stressed member engine combined with a monocoque to reduce weight, with other teams adopting the concept after its success. An iteration of it, the 49B, also pioneered the use of aerofoils to generate downforce.
The Porsche 908 was a racing car from Porsche, introduced in 1968 to continue the Porsche 906-Porsche 910-Porsche 907 series of models designed by Helmuth Bott (chassis) and Hans Mezger (engine) under the leadership of racing chief Ferdinand Piëch.
The Porsche 907 is a sportscar racing prototype built by Porsche in 1967 and 1968.
The Mirage Lightweight Racing Car was a family of race cars built by J.W. Automotive Engineereing (JWAE) at Slough in England, initially to compete in international sports car races in the colours of the Gulf Oil Corporation.
The 1967 24 Hours of Le Mans was the 35th Grand Prix of Endurance, and took place on 10 and 11 June 1967. It was also the seventh round of the 1967 World Sportscar Championship.
Shelby American, Inc. is an American high performance automobile company founded by driver Carroll Shelby. The Shelby American name has been used by several legally distinct corporations founded by Shelby since his original shop in Venice, California began operation in 1962. The current iteration is a wholly owned subsidiary of Carroll Shelby International, Inc., a holding company formed in 2003. Carroll Shelby International's other wholly owned subsidiary is Carroll Shelby Licensing, which licenses the name and trademarks associated with Shelby to other companies. Shelby American was the first automobile manufacturer in the state of Nevada. Shelby American manufactures component automobiles, including replicas of the small-block and large-block AC Cobras, the Shelby GT350 and the GT500 Super Snake. Since 2005, Shelby American has released new models each year.
The Chaparral 2F is a Group 6 sports prototype designed by Jim Hall and Hap Sharp and built under their company Chaparral Cars. Built with the intention to compete in the World Sportscar Championship, it competed in the 1967 season, with a best finish of first at the BOAC 500, driven by Phil Hill and Mike Spence. The 2F, alongside its Can-Am sibling the 2E, had a heavy influence in dictating the direction of Formula One car design in the late 1960s and early 1970s. With the amounts of mechanical grip the car and tires could provide approaching their respective limits, there was a larger emphasis on aerodynamic efficiency with race car designer Colin Chapman quick to include them on his Formula One cars.
The Howmet TX is an American sports prototype racing car designed in 1968 to test the competitive use of a gas turbine engine in sports car racing. Planned by racing driver Ray Heppenstall, the TX combined a chassis built by McKee Engineering, turbine engines leased from Continental Aviation & Engineering, and financial backing and materials from the Howmet Corporation.
Alan Mann Racing was a British motor racing team organised by Alan Mann, who was a part-time racing driver and team manager. The team ran a substantial part of the Ford works racing effort in Europe from 1964 to 1969, when it ceased operations. It was based in Byfleet, Surrey, near the Brooklands race circuit.
Leonard Bailey was a British automobile designer.
Peter Harry Sutcliffe, a British textile manufacturer from Huddersfield, was active in sports car racing until 1967. Between 1959 and 1967 he won the 1964 Prix de Paris at the Autodrome de Linas-Montlhéry, and the 1965 Pietermaritzburg 3 hours. He raced in Aston Martins, Jaguar D-Type and E types, Shelby Cobra Daytona, Ford GT40s and works Ferrari 330P4s.
The 1968 RAC Tourist Trophy was a motor race which was held at the Oulton Park circuit, in Cheshire, England, on the 3 June. Although the 1967 race was part of the European Touring Car Championship, the 1968 and 33rd running of the RAC International Tourist Trophy Race saw a return to Group 7 sportscars. The world's oldest motor race was the fourth round of the 1968 British Sports Car Championship.
The McLaren M8A was a race car developed by driver Bruce McLaren and his Bruce McLaren Motor Racing team for their entry in 1968 Can-Am season. The M8A and its successors dominated Can-Am racing for four consecutive Can-Am seasons, until the arrival of the Porsche 917.
The Ligier JS3 is a sports-racing car built by Automobiles Ligier. It was unveiled in 1971 and ended its competition life the same year. Only one JS3, chassis JS3-01, was ever built.