[extropy-chat] Relativity drive: the end of wings and wheels?
hkhenson at rogers.com
Sat Sep 9 04:54:49 UTC 2006
At 06:53 PM 9/8/2006 -0700, you wrote:
>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
Thought experiment. The power you can get out of a moving object is the
product of speed and force.
So let a vehicle with a reactionless drive on a zero friction bearing
accelerate to a high enough speed. Then you lower a wheel and draw enough
power to run the drive. Let it go a little faster and you are making
power. (This assumes the drive force is invariant to the reference
frame.) QED, a reactionless drive is the same thing as a perpetual motion
machine that *makes* power.
> >> 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.
True, but it would sure make the news.
The article mentioned 2 gms. That's the wrong unit, but assuming they were
talking about supporting 2 gms in a 1 g field, that/s about .020 Nt.
For a photon drive, the force is equal to power (in watts)/c or P = .02 x 3
x 10^8 = 6 x 10^6 watts or 6000 kW. The heck with it as a reactionless
drive, I want use it to heat my house!
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