After being released, the train passes through the station, enters a Cobra roll element (referred to as a boomerang by the designers) and then travels through a vertical loop.

During the reverse cycle, riders experience a g force of up to 5.2 when the train re-enters the vertical loop at 47 miles per hour (76 km/h).

In back row of the train – the first to enter the loop – this represents one of the most forceful moments seen in steel rollercoaster design.

The first Invertigo, HangOver at Liseberg in Gothenburg, Sweden was supposed to open in 1996 with a new linear induction motor (LIM) or LSM lift.

However, development problems delayed the ride's opening to 1997, and the design was remade to include a traditional chain lift like the original Boomerang.

The prototype opened at Drayton Manor Theme Park, as "Ben 10 – Ultimate Mission", in April 2011; it was later renamed to Accelerator.

[4] This version uses a launch system rather than a catch car lift hill and has a longer layout and fewer inversions than the normal boomerang and is more similar to rides such as Mr.