And an Art. The seatbelts are tightly fastened, and any chance of turning back has long since been forfeited. On the rollercoaster, another amusement ride, another terror ride, has begun.
Every amusement park has at least one such device designed to set people spinning.
Today's big dipper rides feature every kind of twist and turn, under tracks, over tracks, corkscrews, multiple loops - feats of motion borrowed from aerobatics. Everything is possible. Or just about everything-as long as it can be calculated. Rollercoaster building is a kingdom of cold, hard numbers. They are the key factor in the creation of rapid rides.