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super-precise ionic thruster



 
 
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  #1  
Old April 11th 09, 06:19 PM posted to sci.astro,sci.physics
Yousuf Khan
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Posts: 594
Default super-precise ionic thruster

Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working together
with another propulsions system designed by NASA, the thrusters should
yield directional control at least 100 times more accurate than any
spacecraft before; down to a millionth of a millimeter. "
http://www.universetoday.com/2009/04...of-relativity/
  #2  
Old April 11th 09, 06:27 PM posted to sci.astro,sci.physics
Androcles[_8_]
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Posts: 1,135
Default super-precise ionic thruster


"Yousuf Khan" wrote in message
...
Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working together
with another propulsions system designed by NASA, the thrusters should
yield directional control at least 100 times more accurate than any
spacecraft before; down to a millionth of a millimeter. "
http://www.universetoday.com/2009/04...of-relativity/


Still testing? When are people going to realise it failed?




  #3  
Old April 11th 09, 06:42 PM posted to sci.astro,sci.physics
Uncle Al
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Posts: 697
Default super-precise ionic thruster

Yousuf Khan wrote:

Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working together
with another propulsions system designed by NASA, the thrusters should
yield directional control at least 100 times more accurate than any
spacecraft before; down to a millionth of a millimeter. "
http://www.universetoday.com/2009/04...of-relativity/


Let's see now...

[10^(-6)][10^(-3) m] = 10^(-9) m or a nanometer.

How much thrust is imparted by the changing angle with orbit of solar
photons bouncing off, absorbed by, and absorbed and re-radiated by the
spacecraft?

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
  #4  
Old April 11th 09, 08:07 PM posted to sci.astro,sci.physics
BradGuth
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Posts: 21,544
Default super-precise ionic thruster

On Apr 11, 10:42*am, Uncle Al wrote:
Yousuf Khan wrote:

Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working together
with another propulsions system designed by NASA, the thrusters should
yield directional control at least 100 times more accurate than any
spacecraft before; down to a millionth of a millimeter. "
http://www.universetoday.com/2009/04...r-the-big-job-...


Let's see now...

[10^(-6)][10^(-3) m] = 10^(-9) m or a nanometer.

How much thrust is imparted by the changing angle with orbit of solar
photons bouncing off, absorbed by, and absorbed and re-radiated by the
spacecraft?

--
Uncle Alhttp://www.mazepath.com/uncleal/
*(Toxic URL! Unsafe for children and most mammals)http://www.mazepath.com/uncleal/lajos.htm#a2


Why not stick with my Ra226 Rn222 ion thrusters?

~ BG
  #5  
Old April 11th 09, 11:19 PM posted to sci.astro,sci.physics
Bluuuue Rajah
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Posts: 299
Default super-precise ionic thruster

Yousuf Khan wrote in :

Small Engine For the Big Job of Testing Theory of Relativity |
Universe Today
"Twelve thrusters will be used for the LISA Pathfinder. Working
together with another propulsions system designed by NASA, the
thrusters should yield directional control at least 100 times more
accurate than any spacecraft before; down to a millionth of a
millimeter. "
http://www.universetoday.com/2009/04...r-the-big-job-

of
-testing-theory-of-relativity/


FEEP is the name of this widget.

"FEEP technology has been earmarked for a broad range of other missions,
including precision formation flying."

This is necessary for extraplanetary interferometry, the technique on
the Terrestrial Planet Finder.

"Through capillary action—a phenomenon associated with surface
tension—caesium flows between a pair of metal surfaces that end in a
razor-sharp slit. The caesium stays at the mouth of the slit until an
electric field is generated. This causes tiny cones to form in the
liquid metal which have charged atoms shooting from their tips to create
thrust."

This paragraph should reference a diagram.

"While the thrust of other ion engines is measured in millinewtons,
FEEP’s performance is assessed in terms of micronewtons. The engine has
a thrust range of 0.1 - 150 micronewtons, with a resolution better than
0.1 micronewtons in a time response of 190 milliseconds or better."

"LISA (Laser Interferometer Space Antenna) will fly to L1"

Satellites orbit L stable points. They must have chosen L1 specifically
to test the engine, because it's unstable as well as having radiation
and solar wind pressure.

Being in earth's shadow, L2 is a popular place to put outward looking EM
satellites. L2 may avoid radiation pressure, but this isn't mandatory,
since shade doesn't help a gravitational interferometer. I wonder
what's currently parked there.

I wonder how far L2 is from the end of earth's magentotail, which also
points directly away from the sun. An L1 sat will be more greatly
affected by solar flares, but we also shed outward plasma blobs by
reconnection, and I wonder if these blobs fly directly across L2, or if
they trail it slightly via our orbital motion.

I wonder how magnetotail blobs compare to solar flares, in destructive
energy.






  #6  
Old April 11th 09, 11:25 PM posted to sci.astro,sci.physics
Uncle Al
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Posts: 697
Default super-precise ionic thruster

BradGuth wrote:

On Apr 11, 10:42 am, Uncle Al wrote:
Yousuf Khan wrote:

Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working together
with another propulsions system designed by NASA, the thrusters should
yield directional control at least 100 times more accurate than any
spacecraft before; down to a millionth of a millimeter. "
http://www.universetoday.com/2009/04...r-the-big-job-...


Let's see now...

[10^(-6)][10^(-3) m] = 10^(-9) m or a nanometer.

How much thrust is imparted by the changing angle with orbit of solar
photons bouncing off, absorbed by, and absorbed and re-radiated by the
spacecraft?



Why not stick with my Ra226 Rn222 ion thrusters?


1) Because you would not recognize engineering even it it came up
and bit you on the ass.
2) Because you are ineducable.
3) Because you are an idiot.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
  #7  
Old April 12th 09, 01:44 AM posted to sci.astro,sci.physics
BradGuth
external usenet poster
 
Posts: 21,544
Default super-precise ionic thruster

On Apr 11, 3:25*pm, Uncle Al wrote:
BradGuth wrote:

On Apr 11, 10:42 am, Uncle Al wrote:
Yousuf Khan wrote:


Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working together
with another propulsions system designed by NASA, the thrusters should
yield directional control at least 100 times more accurate than any
spacecraft before; down to a millionth of a millimeter. "
http://www.universetoday.com/2009/04...r-the-big-job-...


Let's see now...


[10^(-6)][10^(-3) m] = 10^(-9) m or a nanometer.


How much thrust is imparted by the changing angle with orbit of solar
photons bouncing off, absorbed by, and absorbed and re-radiated by the
spacecraft?


Why not stick with my Ra226 Rn222 ion thrusters?


* 1) Because you would not recognize engineering even it it came up
and bit you on the ass.
* 2) Because you are ineducable.
* 3) Because you are an idiot.


Those are just silly excuses, mostly because you're jealous.

~ BG
  #8  
Old April 12th 09, 02:31 AM posted to sci.astro,sci.physics
Uncle Al
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Posts: 697
Default super-precise ionic thruster

BradGuth wrote:

On Apr 11, 3:25 pm, Uncle Al wrote:
BradGuth wrote:

On Apr 11, 10:42 am, Uncle Al wrote:
Yousuf Khan wrote:


Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working together
with another propulsions system designed by NASA, the thrusters should
yield directional control at least 100 times more accurate than any
spacecraft before; down to a millionth of a millimeter. "
http://www.universetoday.com/2009/04...r-the-big-job-...


Let's see now...


[10^(-6)][10^(-3) m] = 10^(-9) m or a nanometer.


How much thrust is imparted by the changing angle with orbit of solar
photons bouncing off, absorbed by, and absorbed and re-radiated by the
spacecraft?


Why not stick with my Ra226 Rn222 ion thrusters?


1) Because you would not recognize engineering even it it came up
and bit you on the ass.
2) Because you are ineducable.
3) Because you are an idiot.


Those are just silly excuses, mostly because you're jealous.


Observed facts exist independent of observers. You are intellectually
loathsome.

--
Uncle Al
http://www.mazepath.com/uncleal/
(Toxic URL! Unsafe for children and most mammals)
http://www.mazepath.com/uncleal/lajos.htm#a2
  #9  
Old April 12th 09, 03:10 AM posted to sci.astro,sci.physics
BradGuth
external usenet poster
 
Posts: 21,544
Default super-precise ionic thruster

On Apr 11, 6:31*pm, Uncle Al wrote:
BradGuth wrote:

On Apr 11, 3:25 pm, Uncle Al wrote:
BradGuth wrote:


On Apr 11, 10:42 am, Uncle Al wrote:
Yousuf Khan wrote:


Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working together
with another propulsions system designed by NASA, the thrusters should
yield directional control at least 100 times more accurate than any
spacecraft before; down to a millionth of a millimeter. "
http://www.universetoday.com/2009/04...r-the-big-job-...


Let's see now...


[10^(-6)][10^(-3) m] = 10^(-9) m or a nanometer.


How much thrust is imparted by the changing angle with orbit of solar
photons bouncing off, absorbed by, and absorbed and re-radiated by the
spacecraft?


Why not stick with my Ra226 Rn222 ion thrusters?


* 1) Because you would not recognize engineering even it it came up
and bit you on the ass.
* 2) Because you are ineducable.
* 3) Because you are an idiot.


Those are just silly excuses, mostly because you're jealous.


Observed facts exist independent of observers. *You are intellectually
loathsome.


In other words, you can't be specific without looking like a
dumbfounded village idiot moron. I think we understand.

~ BG
  #10  
Old April 12th 09, 04:44 PM posted to sci.astro,sci.physics
Dr J R Stockton[_24_]
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Posts: 7
Default super-precise ionic thruster

In sci.astro message , Sat, 11 Apr 2009
13:19:14, Yousuf Khan posted:
Small Engine For the Big Job of Testing Theory of Relativity | Universe
Today
"Twelve thrusters will be used for the LISA Pathfinder. Working
together with another propulsions system designed by NASA, the
thrusters should yield directional control at least 100 times more
accurate than any spacecraft before; down to a millionth of a
millimeter.


A source which considers a millionth of a millimeter to be an
appropriate measure of directional control is one i8n which confidence
should not be reposed.

--
(c) John Stockton, nr London, UK. Turnpike v6.05.
Web URL:http://www.merlyn.demon.co.uk/ - w. FAQish topics, links, acronyms
PAS EXE etc : URL:http://www.merlyn.demon.co.uk/programs/ - see 00index.htm
Dates - miscdate.htm moredate.htm js-dates.htm pas-time.htm critdate.htm etc.
 




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