Twister roller coaster

Source: Wikipedia, the free encyclopedia.
Poltergeist at Six Flags Fiesta Texas in San Antonio, Texas

A twister roller coaster is the generic name given to any

head chopper
effect.

Twister roller coasters were unheard of before the 1920s. John Miller is credited with inventing upstop wheels and secure lap bar restraints, both which led roller coaster designers to create wilder and twistier layouts.

A good example of the difference between an out and back design and twister design is layouts of Apollo's Chariot and Raging Bull, two Bolliger & Mabillard designed hypercoaster roller coasters that debuted in 1999. Apollo's Chariot uses a traditional out and back layout while Raging Bull is a twister.