Inversion

An inversion is any element on a roller coaster where the track and vehicle rotate riders beyond the vertical plane — placing them at least partially upside down. The major inversion types include the vertical loop, cobra roll, Immelmann, dive loop, corkscrew, inline twist, heartline roll, zero-G roll, flat spin, batwing, and pretzel loop, each producing a distinct combination of G-forces and directional change.

Modern coasters routinely feature six to fourteen inversions in a single layout. The inversion count is one of the primary statistics used to describe a coaster's intensity. Inversions generate positive G-forces at the bottom of loops (pressing riders into their seats) and negative G-forces at the tops (creating brief airtime while inverted). Record holders include Smiler at Alton Towers with 14 inversions, and The Swarm, Colossus, and Nemesis — all prominent European examples of inversion-heavy rides.