The routine was impossible. Bob Hoover would take off in his Rockwell Shrike Commander — a twin-engine business aircraft, not an aerobatic plane — climb to altitude, and shut both engines off. Then, on nothing but momentum and gravity, he would fly a loop and an eight-point hesitation roll before landing the dead aircraft, engines still off. In a separate signature stunt, he would pour iced tea from a pitcher into a glass while flying a perfect 1G barrel roll — without spilling a drop. The crowd, which had been watching in paralysed silence, would erupt.