A zero-g stall is a roller coaster inversion.
While travelling uphill, the track rotates 180 degrees - fully inverting riders. The track then levels out and while travelling downwards, the track rotates 180 degrees again but in the opposite direction.
The element has been featured on four roller coasters, all built by Rocky Mountain Construction:
- Goliath at Six Flags Great America
- The Joker at Six Flags Discovery Kingdom
- Steel Vengeance at Cedar Point
- Wildfire at Kolmården
The first all-steel roller coaster with a zero-g stall, Steel Curtain at Kennywood, will open in 2019.
Similar inversions[edit | edit source]
The top gun stall is very similar to the zero-g stall, the only difference being that the track twists in the same direction during the entrance and the exit of the element.
| Thrill elements | |||||||||
| Inverting | Banana roll • Batwing • Bent cuban eight • Bowtie • Butterfly • Cobra loop • Cobra roll • Corkscrew • Cutback • Dive drop • Dive loop • Diving turn • Double dip • Fly to lie / Lie to fly • Flying snake dive • Heartline roll • Immelman • Inclined dive loop • Inclined loop • In-line twist • Interlocking corkscrews • Interlocking loops • Lagoon roll • Norwegian loop • Pretzel knot • Pretzel loop • Raven turn • Reverse cobra roll • Reverse sidewinder • Roll over • Saxophone • Scorpion tail • Sea Serpent • Sidewinder • SkyLoop • Step-up under flip • Tongue • Top-Gun stall • Twisted horseshoe roll • Vertical loop • Zero-g roll • Zero-g stall | ||||||||
| Non-inverting | Hammerhead turn • Helix • High five • Non-inverted loop • Splashdown • Stengel dive • Tilt section • Trick track • Triple dip • Tunnel • Turntable • Vertical drop track • Water brakes • Wave turn | ||||||||
| Variable | Top hat | ||||||||