at 7,000 rpm, with the max speed of roughly 360kmh. The weight of the 2J was under 1800 pounds, or 816kg. A similar fan was used in Formula One eight years later on the Brabham BT46B, which won the 1978 Swedish Grand Prix, but the company reverted to the fanless BT46 soon afterward due to concern for a rules violation. The car was later deemed to have been within FIA technical specifications. 2K The 2K was a Formula One-inspired ground effect Indy car designed by Briton John Barnard. Debuting in 1979 with driver Al Unser Sr., it went on to win six races in 27 starts over three seasons. Its greatest success came in 1980 when Johnny Rutherford won both the Indy 500 and CART championship. Indy car team 1970s Chaparral started fielding Indy cars in 1978 with Al Unser driving the No. 2 First National City Traveler's Checks Lola T500-Cosworth DFX. Unser then managed to win the 1978 Indianapolis 500. Later in the season Unser added wins at the California 500 at Ontario Motor Speedway and the Schafer's 500 at Pocono International Raceway; this remains the only time a driver has won the Triple Crown. Despite these wins, Unser lost the championship to Tom Sneva (who failed to win a race). With the formation of CART, Hall fielded Unser in the No. 2 Pennzoil Lola T500-Cosworth DFX. At the 1979 Indianapolis 500, Hall and fellow CART board men Roger Penske, Pat Patrick, Teddy Mayer, Ted Field, and Robert Fletcher were initially not allowed to compete in the race since it was part of the USAC National Championship. At the same time Hall was going to introduce the Chaparral 2K-Cosworth DFX. In the race Unser lead for 89 of the 200 laps but an engine fire on lap 105 ended his participation. He later won the season-ending Miller High Life 150 at Phoenix International Raceway and finished fifth in CART standings but was ineligible for USAC points. 1980s By 1980 Unser was replaced by Johnny Rutherford after having disagreements with Hall. The only change to 2K was its number, now four. Rutherford won five races that season, including the 1980 Indianapolis 500, the Datsun Twin 200 at Ontario Motor Speedway, the Red Roof Inn 150 at the Mid-Ohio Sports Car Course; the Norton 200 at Michigan International Speedway, and the Tony Bettenhausen 200 at the Wisconsin State Fair Park Speedway.