Repulsor Drive
From benscondo.wiki-rpg.com
When Fayth Wilson activated the alien vessel on Tiger Mountain, one of the first things the ship's computer did was relay a message to her regarding the status of all major systems. One of the systems listed was the "Repulsor Drive." This may be the lift/propulsion mechanism for ths ship, but this has not been verified.
This technology has not been researched yet.