Gravity Engines

A Gravity Engine is a technology and propulsion system that uses localized artificial gravity to create a "Falling" acceleration towards a fixed point very close but perpetually away from the target. Though initially slow compared to rockets, and traditional propulsion systems, gravity engines steadily build speed at lower energy coasts and minimal fuel. This has allowed effective system wide travel.

Access & Availability

Gravity Engines are in wide use and still are a major tool in every space fairing organization.

Complexity

The engineering feat is deceptively simple once the underlying mathematics is known.

Discovery

During the golden age of the United Earth Sphere a doctor named Sergei Kiwalski discovered the unifying principle between gravity and electromagnetism finally bringing the four fundamental forces closer together. From there developing the means to create artificial gravity via an electrical charge to simulate the phenomenon called somewhat erroneously as "Gravatons."  
Though limited to small scale within thigh atmospheres and complicated environments, in space it took little time for it to be used to create small localized gravitation events, reliably being developed into an engine by the engineer Zhou Mae, whose work in the field is still the baseline for effective engines. They would later be used for Lancer Mobile Platforms and space stations.