Educational Sidebar: The Tilt-A-Whirl

aka. "tilted world" (according to Mom) is my Mom's favorite fair ride (also, a song by the Insane Clown Posse). The Tilt-A-Whirl was invented in 1926 by the Sellner Manufacturing Company, which continues to be the only source of new rides. A new Tilt-A-Whirl ride costs about $300,000 (depending on the options you get) and takes 4 people about 3 hours to set up (assuming they know what they're doing). It features seven cars that can seat 4-6 people per car meaning it can give rides to as many as 500 people in an hour.

The ride follows a chaotic orbit-like motion. The seven cars are each fixed to a pivot pin on a circular platform. These platforms follow a circuitous track with 3 hills and 3 valleys at a set speed of 6.5 rpm. This orbit causes variable centrifugal and gravitational forces to affect each car, which will rotate clockwise or counterclockwise on it's set pivot point at different speeds depending on multiple variables (e.g. where on the track the car was when the ride began, where it is on the track at a given moment, how much weight is in the car and where it is situated, the friction of the various contact points between the car and the track, etc.). Good times!

It has been calculated that when the platforms travel at very low speeds each car will complete one backward revolution as its platform goes over each hill. Whereas at high speeds each car will be stranded at its outer edge (like swinging a bucket of water around). But at intermediate speeds (say 6rpm?) the movement of the cars is so unpredictable it has even been used by mathematicians in chaos theory! However, as any Tilt-A-Whirl veteran knows the ride can be manipulated by strategic leaning or if the ride's operator decides to mess with you.