because many teams switched to Dallara chassis and therefore did not develop them) but the basic monocoque continues to be extremely successful as a hillclimb car nearly fifteen years later. The Ralt 94C was designed by Chris Radage and was not a success. Later Formula Atlantic variants The RT40 and RT41 were Formula Atlantic derivatives of the later Formula Three cars; the RT40 was the last Ralt with which Tauranac was involved. Many Champcar World Series and Indy Racing League drivers past and present, honed their skills in these cars, including Jacques Villeneuve, the 1995 Indy 500 winner and 1997 F1 World Champion. After being phased out of the Pro Atlantic series in 1998 in favor of the Swift 008a, the Ralt RT40s and 41s are still being raced competitively (2007) in the Sports Car Club of America, some 13–14 years after the RT40's debut, with Rennie Clayton winning the SCCA Championship in a Ralt RT-41 as recently as 2003. Originally equipped for Pro Atlantic racing with a highly tuned variant of the Toyota 4A-GE twin cam engine displacing 1.6 litres and developing approximately 250 bhp; several of these chassis have been converted both with bodywork to compete in SCCA C Sports Racer (CSR) and now Prototype 1 (P1) with other engine packages such as the twin rotor 13b Mazda, Honda and Cosworth 1600. Ralt in other hands Ralt's 1988 Formula 3000 car was proving a challenge to develop; the works drivers' backers (for the first time, Tauranac was running paying drivers rather than paying his own) encouraged them to leave the team and not pay up; the company was also suffering from loss of its American markets for RT4s (Swift were upping the stakes dramatically) and RT5s (SuperVee was on its last legs in the US as a major category). Reynard's aggressive marketing was cutting into the F3000 and F3 markets. Tauranac was looking to sell the company and ultimately ended up selling out to March for just over a million pounds; they had concentrated on high-value bespoke racing cars and allowed their customer cars to atrophy so the merger appeared to be a good move. The subsequent history of Ralt as part of March is complex, but can be summarised as - operated as March's customer car division for a couple of years, was part of a management buyout when the March Group board decided to divest itself