IMO; that sounds really cool. I think it is the future for propulsion.
28th December, 2012 @ 5:26 a.m. (California Time)
Too bad it needs Xenon gas, that makes the engine unsustainable, Any other material like space rock would be better, though hard to collect in empty space, because of the speed difference.
28th December, 2012 @ 6:26 a.m. (California Time)
7kw is about 7000 / 640 watts per horsepower = 10.9 horsepower
that doesn't sound anything at all like the amount of power needed to
support a coin on a table.
Now, what kind of nuclear power will they use to run it? How much does it mass? What is it's fuel mass loss? Couldn't they use a denser, solid material instead of xenon and heat it to the useful temperature and save on storage mass/volume? Can the process be scaled up to 1000 times current power? Can any form of mass be used as long as it is heated to gas/vapor temperature? If so, then you could use solar panels when near a sun for power and then use their mass as fuel when away from the sun. Thus reducing vehicle mass at the same time.
28th December, 2012 @ 8:35 a.m. (California Time)
Encouraging research and development projects continuously produce results, such as the Xenon ion thruster for future space exploration missions. Evidence of remarkable achievements continue in most all the disciplines, except in the realm of humanity's domain and condition
. Billions are spent in pursuit of knowledge relevant to areas of science which currently have little to do with the human condition overall. In effect, - hanging curtains before the house is built. Agreed, - it isn't all negative, since much has been discovered which has produced beneficial knowledge applicable to the development of new discoveries in biology and medical science. However, nothing of tangibility has so far been discovered to transform human nature which will allow it to overcome the destructive influences of 'greed' and the lust to control and dominate other members of our species to a status-dominated sub-cultural state.
28th December, 2012 @ 9:10 a.m. (California Time)
"What this means in simple terms is that the NEXT engine can make a spacecraft go (eventually) very far and very fast."
How far? How fast?
28th December, 2012 @ 9:25 a.m. (California Time)
I was under the impression that ions could be gathered in space much as rocket engines gather more combustible air to accelerate as the ion propulsion systems gather speed. Aren't ions available everywhere in space? And the only thing necessary is to gather and channel them for thrust? Or am I just such a neophyte that I believe in Star Trek too much?
28th December, 2012 @ 9:37 a.m. (California Time)
This engine is for space travel. Not take-offs or landings. And in space, where there's pretty much nothing to slow down the spacecraft, any amount of force will do. This engine is a constant, reliable and durable source of thrust, which is exactly what NASA wanted for space travel. This engine is gonna get people to Mars one day.
28th December, 2012 @ 10:04 a.m. (California Time)
the only problem i have with this type of engine is it leaves no room for error in navigation. what about the plasma engine more power required but far more thrust.
28th December, 2012 @ 12:42 p.m. (California Time)
Better yet this engine or one like it will get us to Mars in weeks instead of months.
28th December, 2012 @ 12:43 p.m. (California Time)
@Nitrozzy: error in navigation? I don't think that's an issue. Traveling through space isn't like missing the exit ramp on the freeway, it's pretty straightforward.
28th December, 2012 @ 2:16 p.m. (California Time)
One would have to attain a fairly high velocity to make interstellar travel worthwhile right? Say, 0.5 c perhaps? Well, besides all the obvious engineering challenges (none really insurmountable), what about collision avoidance? Seems a pitty to take all that money away from feeding the poor, honoring the elderly, providing quality education for the masses, ongoing medical advancements and the like, just to be obliterated by a rougue asteroid somewhere....
Remember, in Space no one can hear you say "awe s#!t!..."
28th December, 2012 @ 3:53 p.m. (California Time)
This tech might be useful to push NEOs into the sun or out to Jupiter. Land it when close and the NEO could be gone before it would have come around again. Slowburn but long duration adds up.
28th December, 2012 @ 4:54 p.m. (California Time)
Very little understanding of Newton in the preceding posts. Assuming constant thrust after reaching escape velocity on another rocket, after separation this ion engine of 7 kW output will produce an acceleration inversely proportional to the decreasing total mass. Distance from the sun, damage to solar receivers, murphy's law, etc are generally negative influences.
28th December, 2012 @ 6:55 p.m. (California Time)
This thruster will be a handy tool in NASA's arsenal but don't get too excited. Five years is barely enough endurance for interplanetary travel, and not even a blade of grass in the ball park for interstellar journeys.
29th December, 2012 @ 3:45 a.m. (California Time)
30,000,000 newton seconds = 20159069.2542 lb/fts
If the space craft weight was 10 tons is would be 20,000 lbs
20159069/20000 = 1007 ft /sec
1007 3600 = 3628632 ft/Hour
3628632/5280 = 687 Miles per hour
So at the end of 5 years our 10 ton space craft is going 687 mile per hour faster than what it started out at.
How this compares to what we have now for the long distance space probes I do not know but I think it will not be taking us to Mars in weeks or months.
The distance to mars varies because of the respective orbits but it was down to 35,000,000 miles in 2008
at 700 miles per hour it would take 50,000 hours (35,000,000/700 ) to get there which is about 2083 days (50,000/24 ) or about 5 years
Actually it would take a lot longer because it takes 5 years to reach that velocity. Of course there is a lot more involved , the starting velocity , time for accell , time to decel , changes in mass as fuel is consumed etc. but my point is that we won't be strapping an Ion engine onto a space capsule and commuting to mars any time soon.
29th December, 2012 @ 12:52 p.m. (California Time)
Using the vague 'force of coin on table' starting point...
Mass of coin (say US quarter) is 5.67g = 0.00567kg
Force on table at sea-level on Earth = 9.81 x 0.00567 = 0.0556N
Total guess at average mass of spacecraft say 2000kg including fuel and assuming the mass doesn't change (which, of course, it will)...
F = ma ; a = 0.0556/2000 = 2.78e-5 m/s/s
Assuming zero initial velocity and no other forces acting on the spacecraft, distance traveled in one year (3.15e7 seconds) will be
s = ut + 0.5at*t (u = 0) ; distance (s) = 1.38e10 meters = 13.8million km
This is about 1/10 of the distance to the sun (0.092 astronomical units)
After one year the craft will have a velocity of v = u + at (u = 0) = 876m/s
After 5 years the numbers are distance : 346million kms (half way to Jupiter) and velocity 4390m/s
29th December, 2012 @ 3:42 p.m. (California Time)
@ Captain Danger; -dphiBbydt
Assuming that is we do not give the spacecraft a good shove first :)
30th December, 2012 @ 8:05 a.m. (California Time)
Done with less than a ton of reaction mass.
30th December, 2012 @ 4:38 p.m. (California Time)
I'm very excited about this deep space project. I work at the reactor facility that is working with NASA to develop the fuel source for these probes. It's a great project with a lot of challenges, but is really interesting. I have a penchant for space and space exploration and love working on this project.
30th December, 2012 @ 6:56 p.m. (California Time)
?? Back when DARPA was experimenting with laser weapons like laser rifles, an optical laser phenomena called 'Repercussion' would occur when a soldier aimed a laser rifle at a mirror or reflective surface, and the laser would 'Repercussion' throughout its length to knock the rifle out of his hands. Eventually, NASA heard about this, and devised repercussion laser setup that could propel tiny payloads about by shooting an optical laser beam into a mirrored part of the tiny capsule, with the hopes that someday we could make massive laser propulsion systems that could project-propel much larger payloads clear into orbit using ground powered lasers. The thing is, what if they could combine this optical laser 'Repercussion' with this ionic drive? Perhaps they could create an optical laser of such a specific frequency, that it could propel ionized gas molecules, so that this 'Repercussion' effect could make an ionic drive with greater fuel efficiency or greater speed as well?
19th January, 2013 @ 9:19 p.m. (California Time)
Techrex; Lasers have almost ZERO kinetic energy . Its as if You have no idea what a laser even is.
6th March, 2013 @ 7:40 p.m. (California Time)
What about this article?
Seems to be a lot faster
6th March, 2013 @ 8:25 p.m. (California Time)