On any average day, the Smiler has a maximum G-force of +4.5 G and a top speed of 85 km per hour. The park's fastest ride, Rita, has a G- force of +4.7 G and a top speed of 100 km per hour.
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All children under 12 years old must be accompanied by an adult of 18 years and above. Children under 3 years old can visit the park for free. The following height and age restrictions apply: Guests must be 1.4m or over to ride Nemesis, Galatica, The Smiler, Oblivion and Rita (Rita has a maximum height of 1.95m).
While commercial flights exert only very minimal positive and negative G-forces on passengers, several orders of magnitude greater are the G-forces experienced by astronauts, fighter pilots and stunt pilots. These types of pilots can experience brief periods of extreme forces of nine and 10 Gs.
A G-force of 1g is equal to the conventional value of gravitational acceleration on Earth which amounts to 9.8 m/s2 (meter per second squared). In other words, it is the force a person (driver, in our case) can experience when they're accelerating or braking.
Although stunt planes are designed to easily withstand very high G-forces of up to 10 or even 12 Gs, stunt pilots who provide rides to the general public rarely perform maneuvers that exceed 4 Gs. This is because the average person does not have special training to handle more than 4 or 5 Gs.