Air time is the feeling of
weightlessnessor negative gravity force experienced on a roller coasteror other amusement rides. On roller coasters this feeling is usually achieved by the train going over a hill. Hypercoasters such as Magnum XL-200at Cedar Pointand Nitroat Six Flags Great Adventureare known for their large amounts of air time. In addition, many wooden roller coasters, such as Balder at Liseberg, The Voyage at Holiday World, and Shivering Timbers at Michigan's Adventureare known for their air-time.
Air-time is caused by
inertiaof the train and the riders. As the train goes over a hill, the mass of the riders tends to resist the downward motion of the ride vehicle, resulting in riders being briefly lifted out of their seats. The amount of airtime caused by a ride is dependent on the velocity of the train, gravity, and the radius of the track transition. Zero gravity is achieved when the downward acceleration is equal to that of gravity, while negative G-forces are caused when the downward acceleration is greater than that of gravity.
Roller coaster enthusiasts differentiate between different types of air-time. "Floater air-time" is caused by the riders experiencing weightlessness or zero gravity while "ejector airtime" is caused by negative G-forces.
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