 Complete the following phrase:  For the new Lotus 79 made more radical and mature use of the ground effect concept. Many other teams began experimenting with the technology, but Lotus had a head start and Mario Andretti won the Championship in the Black Beauty, becoming the first driver to win both the American IndyCar championship and the Formula One title. Brabham outbid Lotus in generating downforce with BT46B fan car, a revival of the sucker car concept used by Jim Halls Chaparral 2J in the Can-Am series in the early 1970s. The car exploited a loophole in the regulations, but the team, led by Bernie Ecclestone who had recently become president of the Formula One Constructors Association, withdrew the car before it had a chance to be banned after winning its only race with Niki Lauda at the wheel at the 