Ion Engine
A wide category of engines that shares the same technological basis - namely, an ion acceleration in magnetic fields. Most of Outer Colonies ships and warships are using a distant descendants of ion-plasma VASIMR Engine, just much smaller and more efficient.
The fuel requirements is much smaller than in Rocket Engines, which is their biggest advantage. They still have to refuel from time to time, but their tankers can carry much more fuel than their Terran Federation counterparts of similar tonnage. This makes colonial fleet much faster and more evasive.
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