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"We follow the scientists around and look over their shoulders. They're watching their feet: provable mistakes are bad for them. We're looking as far ahead as we can, and we don't get penalized for mistakes."
- Larry Niven

Hushicopter  
  A nearly-silent helicopter.  

In the glow of the car's headlights, Morrison made out a helicopter, its rotors turning slowly and its motor making only the slightest purr.

It was one of the new kind, its sound waves suppressed, its smooth surface absorbing, rather than reflecting, radar beams. Its popular name was the "hushicopter"...

The automobile stopped and the headlights went out. There was still the faint purr and a few dim violet lights, hardly visible, marked the spot where the hushicopter sat.

From Fantastic Voyage II: Destination Brain, by Isaac Asimov.
Published by Spectra in 1987
Additional resources -

Thanks to Randall G Modesto for pointing this item out.

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Additional resources:
  More Ideas and Technology from Fantastic Voyage II: Destination Brain
  More Ideas and Technology by Isaac Asimov
  Tech news articles related to Fantastic Voyage II: Destination Brain
  Tech news articles related to works by Isaac Asimov

Hushicopter-related news articles:
  - Secret Silent Stealth Helicopter

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