Approximately 1.9 G's on Top Thrill Dragster, and most of that is sustained throughout the launch-flat, while the pneumatic catapults like Dodonpa and HyperSonic XLC loose that acceleration G-force gradually (the same with all non-hydraulic catapult systems). Xcelerator pulls approximately 2.2 Gs during the take-off
Thats all. I thought it would be a little more than 1.9.
