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"My feeling is that the chance of our surviving into the twenty-first century as working civilization is less than fifty percent but greater than zero."
- Isaac Asimov
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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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'An adjustment panel outside the door would cause it to extrude various appurtenances in memory plastic...'
'Annealed in any shape for a time, and codified, the structure of that shape is retained down to the molecules.'
It's not really polite to tear the limbs off robots.
'...the imaginary companions discovered by needful children.'
''Pardon me, Struthers,' he broke in suddenly... 'haven't you a section of the factory where only robot labor is employed?''
'I opened the oblong box, where lay the automatons side by side...'
'They tied the memory to the bloodline and that was their record!'
'It seems that at one time computers were designed directly by human beings.'
'...the spot was a lonely one in an uncharted region, far from the normal lanes of space traffic.'
