Ro-Tarn Dorsal view, close-up of fuel collection system
Some features present on the outdated Alpha and Beta type Apocrita class are still in use on the Gamma and even Theta types, one example is the gaseous fuel collectors mounted on either wing. These collectors enable the ship to refuel by diving into the atmospheres of gas giants to collect starlight gas, helium additives, and, in earlier iterations, deuterium. As gas is sucked through the intakes it is run through a magnetic centrifuge to separate out useful material, the waste is then heated and compressed (sometimes to the point of ignition) to provide additional thrust as it exits through the twin exhaust ports on either side of the main engine. This is the source of the misconception that the Apocrita is actually a tri-engine design.