Work done in the Propulsion System Factory allows your ships to move faster through space by way of upgraded engines. Each level grants an additional 5% increase in speed. All ships built at the shipyard on this planet will receive the increase. Existing ships are not retrofitted, they will need to be scuttled and rebuilt. All ships affected by this increase will have a slightly increased cost to build.You may only have one Propulsion System Factory on a planet.
In order to produce high performance engines you'll need a good supply of structural minerals such as rutile, chromite, bauxite, magnetite, beryl, or goethite.