[extropy-chat] Relativity drive: the end of wings and wheels?
Eliezer S. Yudkowsky
sentience at pobox.com
Sat Sep 9 01:53:46 UTC 2006
Keith Henson wrote:
> Reactionless drives *are* perpetual motion machines. If you can't
> visualize why I can explain the obvious.
Actually, I can't see this as obvious. Suppose the reactionless drive
requires a thermal differential to drive it, and equalizes the thermal
differential in the process. How would it necessarily violate the
second law of thermodynamics in the course of violating conservation of
>> If they told me that microwaves shot out the other end, I'd be far more
>> willing to believe it.
> I wouldn't. You have any idea of what a microwave generator with 2 gms of
> thrust would do to the countryside?
The thought had occurred to me, but as a matter of fact, I didn't know
off the top of my head. Also, my statement was just with respect to the
prospect of producing thrust. Laying waste to the countryside doesn't
violate *physical* law.
Eliezer S. Yudkowsky http://singinst.org/
Research Fellow, Singularity Institute for Artificial Intelligence
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