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Examination of wormholes in operation also provided the key for scientists to unlock the technology of gravity manipulation.
The main application for this area of physics is the Contra-Grav Thruster (CGT). On the large scale, modern CGTs are incredibly efficient, having a thrust to mass ratio of around 6000 to 1. In other words a starship which has one tenth of its mass devoted to thrusters can accelerate at 600 G.
However, on the smaller scale CGT efficiency drops of rapidly. For smaller vessels, shuttles & dropships etc, a typical maximum acceleration is around several G's. On the small scale, i.e. man-portable, thrust to mass ratio drops below 1, i.e. not even capable of supporting its own weight in a typical planetary gravity field.
Ships employing CG thrusters also incorporate systems based on similar technology to prevent the occupants from being crushed by the accelerations used, and to provide a steady shipboard gravitational, these systems are known as 'inertial dampers'.
Read about forcefield technology in chapter 3.