a misfire, and pulled alongside Mansell several times, but could not get around. He retired after an attempt to pass on lap 11 resulted in a spin. Lauda was next to challenge Mansell, but he was passed by de Angelis when the latter's engine began to run on all six cylinders. The first five cars (Mansell, de Angelis, Lauda, Rosberg, Prost) were now running as a group, and on lap 14, Rosberg passed Lauda for third and closed up on the two Lotuses. He passed de Angelis on lap 18, and soon was looking for a way past Mansell. Arnoux, having qualified fourth, had been unable to start his car on the grid, and began the race from the back of the pack. By the end of the first lap, he had already passed seven cars and now he and Piquet were closing on the group of leaders. Rosberg, after briefly trading places with Prost, who had gotten by Lauda and de Angelis, finally forced Mansell into a big enough mistake for him to take the lead. Within three laps, Mansell, whose front tires were quickly fading, had dropped three more places before pitting on lap 38. Piquet became the ninth car to retire because of contact with the wall, and Arnoux moved into the top five. Prost took the lead from Rosberg on lap 49, and quickly opened a 7.5-second lead, but eight laps later struck a wall and damaged a wheel rim. Rosberg inherited a lead of 10 seconds over Arnoux, and, thanks in part to a special skull cap driver cooling system, held on to score his only victory of the year for Williams, as the two-hour limit was reached one lap short of the scheduled 68. De Angelis came home third, comfortably ahead of Laffite in the second Williams. De Angelis's teammate Mansell made contact with the wall. Mansell coasted around the last corner, visor up and seat belts hanging over the side of the car. As his car slowed on the home straight, he leaped from his black Lotus and tried to push it to the end, but collapsed from exhaustion and the oppressive heat before reaching the finish line. He was classified sixth, three laps behind. The oppressive heat was a factor of the Dallas Grand Prix becoming a one-off, and the event was replaced by the following year's Australian Grand Prix. Formula One