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"SF looks towards an imaginary future, while fantasy, by and large, looks towards an imaginary past."
- Frederik Pohl
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| Reaction-Motors | ||
| A spacecraft engine that works by firing matter out at high speed. |
This idea makes use of conventional physics.
| For three days Captain Grant had kept his great space-liner… ahead of the questing disintegrator rays of the Black Hawk only by burning his full battery of reaction-motors at their maximum power. |
| Technovelgy from Twelve Hours To Live,
by Jack Williamson. Published by Wonder Stories in 1931 Additional resources -
|
Here's what the drive looked like in operation:
The glow, he knew, was a fluorescent, electronic discharge in the radioactive gases jetting from the rockets of the racing ship...
The idea behind a reaction-motor is Newton's Third Law of Motion, which decrees that for every action, there is an equal and opposite reaction. For a spacecraft to move forward, you must throw matter out the other end.
Compare to the reactionless drive idea, which encompasses the various hyperdrives that allow a ship to move from one point to another in space, without traversing the space in between. See the inertialess drive from 'Doc' Smith's 1934 novel Triplanetary.
…Grant saw a vague pink glow come into being in the jet, star-sprinkled sky behind…
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| Crystalline Structures In Space, You Say? |
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'The suit stands up and starts walking, gripping me round the calves and waist, taking the bulk of my weight off my throbbing feet.'
't came out into plain view. Darkington glimpsed a slim body and six short legs of articulated dull metal.'
'Internally it’s made up of millions of components, but the most important ones are the thinking and memory parts of the Mind proper.'
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'Chris, the City Fathers are not interested in your welfare; I suppose you know that. They're interested in only one thing: the survival of the city.'
'Drake was the young spatial engineer he employed to terraform the little rock...'
