Heartline roll
From Wikipedia, the free encyclopedia
A heartline roll is a roller coaster inversion in which the rider performs a 360-degree roll. Heartline rolls are commonly confused with Inline twists.
In a heartline roll, the center of the train rotates on one axis. The track itself changes in elevation so as to keep the train moving in the same line in which it started the element. In an inline twist, the track with the 360 degree twist remains straight. As such, the train moves downward and then back up during the twist. In some cases, such as Vekoma's flying dutchman coaster, the degree to which the train deviates from the line in which it enters the twist is so great, the element is indistinguishable from a corkscrew.
There is also some confusion over the difference between a heartline roll and a zero-g roll. A zero-g roll is basically a standard hill with a 360 degree twist at the top. The trains ascend, twist, and then descend again (providing a brief moment of airtime). In a heartline roll, once again, the trains do not leave the line from which they entered the inversion.
