Lotus-Pratt& Whitney

Origins

Lotus-PW is the constructor designation covering Colin Chapman's most adventurous engineering experiment: the gas-turbine Pratt & Whitney-powered Lotus 56B that contested several rounds of the 1971 world championship. The 56B descended directly from the wedge-shaped Lotus 56 turbine Indycar that had so nearly won the 1968 Indianapolis 500 with Joe Leonard and the four-wheel-drive system that defined Chapman's late-1960s Indianapolis ambitions.

The 56B

The Formula 1 adaptation retained the wedge silhouette, four-wheel drive and a Pratt & Whitney STN 6/76 free turbine producing around 500 hp. Emerson Fittipaldi, Reine Wisell and Dave Walker all drove the car during 1971 outings at Brands Hatch, Zandvoort, Silverstone, Monza and the Italian and Canadian rounds. The turbine's challenges were profound: brutal throttle lag, fuel-thirsty operation, weight penalty from the four-wheel-drive transmission, and tyres that struggled with the constant power delivery.

Scope

The 56B never finished higher than eighth (Fittipaldi at Monza). After the 1971 experiment ended, Chapman abandoned turbines for F1, returning to conventional Cosworth DFV power with the Lotus 72 family that would deliver the 1972 and 1973 constructor titles.

Legacy

Lotus-PW is a beloved oddity in F1 history — proof of Chapman's willingness to chase radical ideas to their conclusion before pivoting back to convention when the data demanded it. The 56B is one of the rare turbine cars to start a world championship grand prix, a status it shares with the BRM P67 of 1964 and a small handful of Indianapolis-era curiosities. Its silhouette is unmistakable and it remains a museum favourite, treasured as a symbol of an era when fundamental questions about powerplant choice were still genuinely open in grand prix racing.