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#REDIRECT[[Space_travel_in_science_fiction#Slower_than_light]] |
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{{notability|date=July 2021}} |
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{{Infobox fictional artifact |
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|name = Impulse drive |
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|image = |
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|imagesize = |
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|caption = |
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|alt = |
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|source = [[Star Trek]] |
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|source_type = franchise |
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|company = |
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|first = [[Star Trek: The Original Series]] |
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|first_ep = |
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|first_type = |
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|date = |
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|creator = [[Gene Roddenberry]] |
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|episode_creator = |
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|type = Propulsion system |
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|genre = Science fiction |
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|owner = |
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|traits = |
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|uses = Allows slower than light interplanetary travel |
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|affilitation = |
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|}} |
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In the fictional ''[[Star Trek]]'' universe, the '''impulse drive''' is the method of propulsion that [[starship]]s and other [[spacecraft]] use when they are travelling below the [[speed of light]].<ref>{{citation|journal=New Scientist|title=Illogical Captain...|date=20 April 1996|author=Lawrence Krauss|issue=2026|page=24|url=https://www.newscientist.com/article/mg15020263.900-illogical-captain.html}}</ref> Typically powered by [[deuterium]] [[fusion power|fusion]] reactors, impulse engines let ships travel interplanetary distances readily. Unlike the warp engines, impulse engines work on principles used in today's rocketry, throwing mass out the back as fast as possible to drive the ship forward. |
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==Practical challenges== |
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There are three practical challenges surrounding impulse drive design: [[acceleration]], [[time dilation]] and [[conservation of energy]]. In the show, [[inertia damper|inertial dampers]] compensate for acceleration. These hypothetical devices would have to be set so that the propellant retained its inertia after leaving the craft otherwise the drive would be ineffective.<ref>{{citation|title=Energy Considerations of Hypothetical Space Drives|author=Marc G. Millis|url=https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20070031912_2007031208.pdf|format=PDF|pages=3|publisher=American Institute of Aeronautics and Astronautics|year=2007}}</ref> Time dilation would become noticeable at appreciable fractions of the speed of light. Regarding energy conservation, the television series and books offer two explanations: |
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* ''[[Star Trek: The Next Generation Technical Manual]]'' indicates that the impulse engines are nuclear fusion engines in which the plasma from the fusion reactor powers a massive magnetic coil to propel the ship. It is a form of [[magnetohydrodynamic]] or [[magnetoplasmadynamic thruster]]. This is used in conjunction with the ship's warp drive's alteration of the ship's relativistic mass, to achieve mid-to-high sub-light speeds. Thrusters, on the other hand, are closer to the designs of a high-efficiency reactant propellant (i.e. a sophisticated rocket engine) and are usually used for high-precision maneuvers. Ion propulsion drives are explicitly detailed to be used in ''Star Trek'' by [[Dominion (Star Trek)|Dominion]] and [[Iconian]] Starships and facilities. |
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* Since a ship traveling at impulse velocities (slower than, but approaching, the speed of light) is still traveling in the normal space-time continuum, concerns of time dilation apply, and it is written in the ''ST:TNG Technical Manual'' that high relativistic speeds are avoided unless absolutely necessary; impulse power is therefore customarily limited to a maximum of {{frac|1|4}} lightspeed (approximately 270,000,000 km/h, or 168,000,000 mph). (Warp travel, on the other hand, is stated in the ''Manual'' to cause no kinds of time dilation effects.) |
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==See also== |
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* [[Physics and Star Trek|Physics and ''Star Trek'']] |
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* [[Physics and Star Wars|Physics and ''Star Wars'']] |
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* {{Memoryalpha|Impulse drive}} |
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==References== |
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{{reflist}} |
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{{Star Trek}} |
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{{DEFAULTSORT:Impulse Drive}} |
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[[Category:Star Trek devices]] |
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