WE WISH IT WOULD NEVER END—the mile-long coil of diving snap rolls that lead into the sledge hammer of opening acts—the Sean D. Tucker Centrifuge. Shoulder over tail, six, seven, eight times to the bone-pounding sound of whomp, whomp, whomp. His biplane beats the air as it winds tighter and tighter, faster and faster, violent as a tornado round its own right wingtip. Then suddenly it stops and flies straight, as if we were fools to think it should stumble after a dizzying spin like that. But a few maneuvers later, bam, bam, bam, at the top of a vertical line, it does flip forward, but flies off again, easy as a wink. This is no ordinary biplane. It is the Oracle Challenger III, with Sean D. Tucker flying his…