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DATABASE > DATABANKS > TECHNOLOGY > Impulse Engines

Secondary, sub-light propulsion system used on Federation Starships for approximately the last two centuries. Powered by at least one fusion reactor - which are also used as a secondary power source in most starships, this system employs a traditional linear thrust effect to propel the ship through normal space up to velocities approaching one quarter the speed of light at maximum yield.

Though due to relativistic time dilation effects approaching the speed of light in this manner, such prolonged usage is not recommended, and a more manageable 1/4 impulse power is usually employed for extended sub-light cruising -(one 16th of c).