Sublight Steering Nacelle

From ROI Wiki

A Sublight Steering Nacelle, used by all races within the Earthfleet universe, are specialized omni-directional sublight engines used for steering a starship in 360 degrees on both its X and Y axis. The primary sublight drives are then used to propel the ship on its Z axis. Placement and quantity of the nacelles depends entirely on the ship, with larger ships having greater numbers than smaller ones. Ships can't normally be propelled by these drives, although, in an emergency situation, they can be used to generate limited amounts of forward propulsion if needed.