The Parnelli VPJ1 is an

open-wheel An open-wheel car is a car with the wheels outside the car's main body, and usually having only one seat. Open-wheel cars contrast with street cars, sports cars, stock cars, and touring cars, which have their wheels below the body or inside fend ...

race car Race, RACE or The Race may refer to: * Race (biology), an informal taxonomic classification within a species, generally within a sub-species * Race (human categorization), classification of humans into groups based on physical traits, and/or s ...

, designed by British designer and engineer Maurice Phillippe for Vel's Parnelli Jones Racing, to compete in U.S.A.C. Championship Car for

1972 Within the context of Coordinated Universal Time (UTC) it was the longest year ever, as two leap seconds were added during this 366-day year, an event which has not since been repeated. (If its start and end are defined using Solar time, ...

. It was driven by

Mario Andretti Mario Gabriele Andretti (born February 28, 1940) is an American former racing driver and businessman, who competed in Formula One from to , and American open-wheel racing, IndyCar from 1964 USAC Championship Car season, 1964 to 1994 IndyCar se ...

Al Unser Alfred Unser (May 29, 1939 – December 9, 2021) was an American automobile racing driver, the younger brother of fellow racing drivers Jerry and Bobby Unser, and father of Al Unser Jr. He was the second of four men ( A. J. Foyt, himself, Ri ...

, and

Joe Leonard Joseph Paul Leonard (August 4, 1932 – April 27, 2017) was an American professional motorcycle racer and racecar driver. Biography Motorcycle career Leonard won the first A.M.A. Grand National Championship Series in 1954 and won it again in 19 ...

. It was powered by an

Offenhauser The Offenhauser Racing Engine, or Offy, is a racing engine design that dominated American open wheel racing for more than 50 years and is still popular among vintage sprint and midget car racers. History The Offenhauser engine, familiarl ...

four-cylinder The engine configuration describes the fundamental operating principles by which internal combustion engines are categorized. Piston engines are often categorized by their cylinder layout, valves and camshafts. Wankel engines are often categoriz ...

turbo In an internal combustion engine, a turbocharger (also known as a turbo or a turbosupercharger) is a forced induction device that is powered by the flow of exhaust gases. It uses this energy to compress the intake air, forcing more air into the ...

engine, reputed to develop between , depending on turbo boost pressure levels. In its original configuration, the car was designed with dihedral wings mounted to either side of the cockpit and sticking up at 45-degree angles. However, the unusual aerodynamic design proved no performance benefits, and by the Indianapolis 500 in May, the design had been revised to have the wings removed. Following the redesign, the car saw success, most notably with

who won three races and won the 1972 USAC Championship.

and

saw minor achievements, with Unser scoring podiums at

Indianapolis Indianapolis ( ), colloquially known as Indy, is the List of capitals in the United States, capital and List of municipalities in Indiana, most populous city of the U.S. state of Indiana and the county seat of Marion County, Indiana, Marion ...

and Pocono, and Andretti at Phoenix.

References

{{IndyCar vehicles American Championship racing cars Open wheel racing cars