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Chinese Say They're Building 'Impossible' Space Drive



 
 
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  #1  
Old September 24th 08, 05:19 PM posted to sci.space.policy
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Default Chinese Say They're Building 'Impossible' Space Drive

See:

http://blog.wired.com/defense/2008/0...e-buildin.html

Is it really "impossible"?
  #2  
Old September 24th 08, 05:30 PM posted to sci.space.policy
Rand Simberg[_1_]
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Default Chinese Say They're Building 'Impossible' Space Drive

On Wed, 24 Sep 2008 09:19:29 -0700 (PDT), in a place far, far away,
made the phosphor on my monitor glow in such a
way as to indicate that:

See:

http://blog.wired.com/defense/2008/0...e-buildin.html

Is it really "impossible"?


Well, if it is, they won't be able to build it.
  #3  
Old September 24th 08, 11:38 PM posted to sci.space.policy
Allen Thomson
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Default Chinese Say They're Building 'Impossible' Space Drive


Is it really "impossible"?


Although I'd like to see a real Space Drive (tm) as much as anyone
else, this looks to be yet another attempt to get net acceleration by
moving stuff(*) around really fast in a complicated way.

IOW, don't bet a lot of money on it.

And, to answer the question, "Yes, it probably is impossible."

(*) Matter, photons, etc.

  #4  
Old September 25th 08, 12:00 AM posted to sci.space.policy
BradGuth
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Default Chinese Say They're Building 'Impossible' Space Drive


wrote:
See:

http://blog.wired.com/defense/2008/0...e-buildin.html

Is it really "impossible"?


There's a good chance that China invented the Emdrive first, as with
most of everything else you and I can think of. Those very little
Dzopa/Dropa Chinese folks most likely didn't get here by way of sheer
happenstance.

~ Brad Guth Brad_Guth Brad.Guth BradGuth BG
  #5  
Old September 25th 08, 12:00 PM posted to sci.space.policy
Ian Parker
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Default Chinese Say They're Building 'Impossible' Space Drive

On 24 Sep, 23:38, Allen Thomson wrote:
Is it really "impossible"?


Although I'd like to see a real Space Drive (tm) as much as anyone
else, this looks to be yet another attempt to get net acceleration by
moving stuff(*) around really fast in a complicated way.

IOW, don't bet a lot of money on it.

And, to answer the question, "Yes, it probably is impossible."

(*) Matter, photons, etc.


No don't bet on it! It seems to me very like an alternative to ion
propulsion. The problem is getting a source of microwaves. One of my
main comments on William Mook's proposals for SSP (at GEO) is that
launches should only be to LEO. The rest of the way should be done by
some form of ion drive.

This would seem to give higher thrust than ion drive, lower specific
impulse (higher though than conventional rockets) and require a larger
amount of power during operation.


- Ian Parker
  #6  
Old September 26th 08, 01:21 AM posted to sci.space.policy
OM[_6_]
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Default Chinese Say They're Building 'Impossible' Space Drive

On Wed, 24 Sep 2008 09:19:29 -0700 (PDT), wrote:

Is it really "impossible"?


....No, it's "impossibre".

OM
--
]=====================================[
] OMBlog -
http://www.io.com/~o_m/omworld [
] Let's face it: Sometimes you *need* [
] an obnoxious opinion in your day! [
]=====================================[
  #7  
Old September 27th 08, 08:05 PM posted to sci.space.policy
David M. Palmer
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Default Chinese Say They're Building 'Impossible' Space Drive

In article
,
wrote:

See:

http://blog.wired.com/defense/2008/0...e-buildin.html

Is it really "impossible"?


You can see how it works in
http://emdrive.com/principle.html

It works the same way as storing compressed gas in a tank shaped like a
truncated cone. On one end is, e.g. a 20 cm diameter endcap, on the
other is a 10 cm endcap. The areas are different by 235 cm^2, so if
you pressurize the tank to 10 atmospheres (1e6 N/m^2) you will get a
difference in force between the two endcaps of 23kN, or a couple of
tons-force.

That's why pressurized gas tanks are precisely manufactured cylinders
instead of cones: otherwise there would be too much danger of one of
them coming loose and flying across the landscape, picking up speed
with each passing second until it either hits something or leaves the
atmosphere, accelerating forever through space until it passes
lightspeed.

--
David M. Palmer (formerly @clark.net, @ematic.com)
  #8  
Old September 28th 08, 02:40 AM posted to sci.space.policy
BradGuth
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Posts: 21,544
Default Chinese Say They're Building 'Impossible' Space Drive

On Sep 27, 12:05 pm, "David M. Palmer" wrote:
In article
,

wrote:
See:


http://blog.wired.com/defense/2008/0...e-buildin.html


Is it really "impossible"?


You can see how it works inhttp://emdrive.com/principle.html

It works the same way as storing compressed gas in a tank shaped like a
truncated cone. On one end is, e.g. a 20 cm diameter endcap, on the
other is a 10 cm endcap. The areas are different by 235 cm^2, so if
you pressurize the tank to 10 atmospheres (1e6 N/m^2) you will get a
difference in force between the two endcaps of 23kN, or a couple of
tons-force.

That's why pressurized gas tanks are precisely manufactured cylinders
instead of cones: otherwise there would be too much danger of one of
them coming loose and flying across the landscape, picking up speed
with each passing second until it either hits something or leaves the
atmosphere, accelerating forever through space until it passes
lightspeed.

--
David M. Palmer (formerly @clark.net, @ematic.com)


The EM drive should function, and perhaps better yet if the waveguide
cone was made chuck full of radon gas, making it a combination EMION
drive with a 1650 year half-life as long as the cache of radium was
sufficient to start with.

~ BG
  #9  
Old October 2nd 08, 11:36 PM posted to sci.space.policy
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Default Chinese Say They're Building 'Impossible' Space Drive

Video: 'Impossible' Space Drive In Action?

See:

http://blog.wired.com/defense/2008/1...impossibl.html
 




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