the vagaries of the aerodynamics; aside from being distracting, this brought up fears that the air pressure might crack or even completely shatter or remove the cockpit at speed. At higher speed, the short front axle began to oscillate, necessitating an increase in the damping of the shock absorbers; but after that last modification, Green found that he could steer with one hand; "I never drifted more than from the black line". The first run using the afterburner sent the car well over ; when it was shut down Green felt as if he had "slammed on the brakes, but the airspeed indicator showed that I was still accelerating under regular engine power". That run hit before salt crystals drawn into the engine threw it off balance. Having only three days total booked at Bonneville, the team had to vacate for Craig Breedlove, who set the record at ; leading to an intense debate within the FIA about what constituted a car, resulting in the unusual decision that Breedlove's three-wheeled jet vehicle was actually a motorcycle. In 1964, Wingfoot Express returned to Bonneville for a week, but the engine never regained the strength shown in their earliest runs, and struggled to pick up speed. Even when another engine was installed, success eluded them. Finally, Walt's brother and longtime competitor Art Arfons, a brilliant intuitive mechanic for both piston and jet engines, suggested that the opening of the "clamshells" on the engine exhaust was the problem. "it was a 1/16 turn of the idle adjustment on the engine and opening of the afterburner clamshells to that brought the engine up to record performance", Green recalls. Green also removed some of the sheet metal around the engine intake, later realizing that in the process he had destroyed the Goodyear logo. But the Wingfoot Express now easily hit with no afterburner. On the last day they had available, October 2, 1964, at 4:06 pm, a short blast of afterburner brought the car to a recorded , but the official record required the run be "backed up" in the opposite direction. The lateness of the hour left no time for refueling, so the decision was made to save fuel by not making a full run over the entire distance for acceleration, and the car started the return run only away from the timing lights. Green and the car accelerated like a rocket, recording a