Last updated: August 18th 2026
RELATIVISTIC TRAVEL IN BtFF
In this house we don't do faster-than-light travel. Relativity is sacred in this universe - the challenge is not to circumvent it, but to live with its consequences.
The rating of relativistic speed of starships in this universe is given as integers of the Lorentz factor (γ) instead of decimal fractions of the speed of light - that is, how many times the subjetive ship time appears to compress due time dilation in comparison with restframe time.
For example, a relatively fast starship with a rating of γ ~ 6 experiences a subjective time that is 1/6th of the restframe - for a 10 light-year trip, thats about 1yr8m trip experienced by the crew. So keep that in mind whenever that gamma (γ) rating gets thrown around.
It is also commonplace to use stasis chambers for the slowing down of biological clocks for really long trips or at lower cruise ratings, for example, Old Humanity managed to make it work for an additional 40 years of subjective time while in their prime.
TRAVEL PROFILES
Travel profiles are constraint that depends on a few factors such as travel speed, acceleration, target distance, and propulsion method.
Typical travel profiles for intermediate distance destinations (d_aceleration < 0.5*d_total), such as those in between large populational centers in the Dominion core are dominated by a acceleration-coast-deceleration type of travel. If we determine:
a = acceleration in G's
d = distance in light-years
y_coast = target coasting speed in Lorentz factor.
Then we can calculate:
Time spent accelerating (total, inertial observer).
Distance traveled while accelerating/decelerating (total, inertial observer).
Coast time (inertial observer).
It then follows that the total travel time is the sum of t_coastinertial + t_burninertial.
As an example case, at 1G acceleration, top speed of γ ~ 6, traveling 50 light-years takes 11.48yrs (acc/dec) + 40.87yrs (coast), for a total time of 52y 4m 5d 14hrs to arrive.
As γ increases (or distance decreases), the math dictates that the acceleration/deceleration phases must increase in time, in such way that, the coasting time shrinks to an infinitesimal fraction of the total time spent traveling. Which means the travel speed grows and peaks before decreasing.
Without a explicit ceiling for the maximum speed obtained, these travel profiles are mostly limited only by fuel reserves in order to sustain constant acceleration throughout the trip - which isn't the case for most non-Qire starships within the Dominion.
Choice of propulsion is determined less by maximum cruise velocity than by economics. Fuel cost, available infrastructure, expected travel time, maintenance requirements, and intended cargo all influence the selection of a propulsion system. Consequently, no single architecture has displaced all others, and vessels of widely differing performance routinely share the Dominion's starlane network.
