How tall will Six Flags new record-setting coaster be? (opens in new tab)

By Robert Niles: So just how tall with Six Flags' new "record setting" launch coaster be?Nicknamed "Project Purple," the Mack Rides launch coaster is now under construction at Six Flags Great Adventure in New Jersey. The theme park this week has welcomed a 450-foot crane on site, to help finish the spike track that will complete the coaster's top height.The main structure of the crane rises to approximately 350 feet. An additional jib will allow the crane to reach a total height of approximat...