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New Nuclear-powered Spaceship Design Revealed
Iddo Genuth writes "A U.S. based company introduced an
innovative propulsion system that could significantly shorten round trips from Earth to Mars (from two years to only six months) and enable future spaceships to reach Jupiter after one year of space traveling. The system, which may dramatically affect interplanetary space travel is called the Miniature Magnetic Orion (Mini-Mag Orion for short), and is an optimization of the 1958 Orion interplanetary propulsion concept."
The original studies performed extensive studies on this problem. They solved it with a double shock absorber system; by tuning the absorbers and the frequency at which bombs were ejected, they could achieve a constant acceleration of 1-2 g.
2. I don't know if you understand how acceleration works. But Fewer larger explosions would make for a rougher ride. And you don't get up to speed on a day to day basis, that would be a weird way to fly a space craft.
3. 1 g constant acceleration for a few hours is pretty freaking fast. This engine could do the thrust of the space shuttle - which is more then 1 g, but why would you do 12 g for more then a few minutes?
If you do 1g acceleration for a full day you are going about After 1 day, you are going 800,000 m/s - 800km/sec or 288,000 km/hour mars is about 78million km away - so you can see how this is going, if you stop accelerating at this speed it's about a 4 or 5 million km a day just coasting, or 20 or so days to get there. So it's silly to do more then 1g acceleration, unless you are leaving a planets surface and need to reach escape velocity. So no worries about weird physical effects from the acceleration - now long term zero g is a whole'nother type of problem, but again no need to make it a long trip with this kind of power.
The rock, the vulture, and the chain
and enable future spaceships to reach Jupiter after one year of space traveling.
The New Horizons probe, heading to Pluto, took slightly more than a year to reach Jupiter. However, there was no need to stop (park in orbit) and it didn't need to carry bulky life-support stuff. Thus, it could take the fast train.
Table-ized A.I.
You mean like a plutonium powered vehicle?
Reading the (now Slashdotted) article, it sounds like this design came directly out of research done into antimatter catalyzed micro-fission. ACMF is a well-proven technology that uses minuscule amounts of antimatter to kickstart or enhance a fission reaction. Because the technology was fairly straightforward and had good returns for antimatter quantities that are reasonable to produce, NASA was funding research into an engine called ICAN.
I remember that there was some talk of actually launching a small probe based on the concept, but apparently the plan was scrapped. (Probably to help fund manned space travel.) Whatever antimatter confinement technologies they were working on may have led to the development of this new magnetic confinement fission technology. Or it could just be a coincidence.
Either way, nuclear technology of this sort is fairly well developed and is not a pipe dream. At least not from an engineering standpoint. Getting the risk adverse US Government and NASA to actually build one of the many known-quantity engines we have on hand is a completely different ball of wax. They're still trying to get us reliable LEO access (Thank God for Griffin is all I can say), so I doubt we'll be seeing any advanced engines in practice until the CEV/Orion project enters its third phase.
Javascript + Nintendo DSi = DSiCade
First, this is a blog troll, to drive traffic to some ".info" site. The actual paper, "Proposed Follow-on Mini-Mag Orion Pulsed Propulsion Concept" presented at an AIAA conference last year, is more useful.
The basic idea is to create a small fission (not fusion) explosion using magnetic compression. Nuclear weapons use chemical explosives to create an implosion, and during the implosion the fissionable material is compressed hard enough to get a 1.5x to (maybe) 2x density increase. With magnetic compression, a small pellet can be compressed hard enough to get a 10x density increase. This allows smaller explosions, around 50 gigajoules instead of the 20 terajoules of a fission bomb. They want to use curium or californium as the fuel, rather than plutonium.
They also want to use magnetic containment, rather than an Orion-style "pusher plate" sprayed with oil. Unclear if that can be made to work.
The experimental work (they compressed an aluminum cylinder with a big magnet at Sandia) was done back in 2002. This isn't really under active development.
It's not a totally unreasonable idea, but it would be a huge job to make it work. For one thing, the plan is to assemble a large spacecraft in orbit, not to take off from Earth. It doesn't help with the problem of putting mass in orbit.
The use of nuclear weapons is banned, yes.
There has been research into nuclear rockets (NERVA), and nuclear power sources.
Project Prometheus shows promise. Already, most of the long range probes that NASA has use radioactive decay as a power source, which is pretty safe and reliable.
There is also the flywheel, which dampens the effect of each combustion event.
Also, it is not an explosion, but rapid combustion.
Further, the magnitude of the events is quite different
( in a car engine, the events are relatively small,
on orion, well, bigger ).
emt 377 emt 4
You do realize that burning coal has put more Uranium into the air than all the atomic explosions combined right?
I'm more worried about Strontium 90 and radioactive iodine.
Given that Hanford deliberately released a BUNCH of radioactive iodine upwind of an indian reservation at least partly to see what its effects would be on the "marginal population" of indians and rednecks downwind (leading to a considerable increase in birth defect constelations and graves' disease), I suspect others are with me on that.
Bantam Dominique roosters crow a four-note song. Once you've heard it as "Happy BIRTHday" you can't NOT hear it that way
The full press release notes that the maximum acceleration would be a mere .6 G's or so, which is more than Mars but obviously less than Earth. This is unlikely to result in any unknown physiological changes. In fact, the at least occasional exposure to g-forces would probably be beneficial compared to continuous micro-gravity.
Anyway, a 100 metric ton craft would be pretty wimpy. That's 5% of the Space Shuttle's mass, for instance. I suspect this would be an unmanned mission. (For reference, the Apollo Service Module & Lunar Module together were about 40 metric tons and the longest Apollo missions only lasted 12 days).
Also, the 'ignition mass' for the fastest version would be a whopping 1300 metric tons of plutonium. Using uranium prices as a stand-in, that's about $300 million in fuel. That's an awful big price tag for just getting a larger probe to Mars faster.
Still, this has very little to do with Orion apart from them both being nuclear pulse propulsion. They only call it a successor to Orion because most people are familiar with Orion.
Orion has already been obsoleted by a similar (but much more effective) design using normal-sized nuclear explosions -- Medusa. Medusa reverses the Orion design, having a parachute in front towing the craft, and detonating the explosives in front of the parachute. It uses structures in tension instead of compression (lighter), it allows the explosions to be further from the craft (less radiation), allows a longer acceleration stroke (smoother acceleration), and captures a larger percentage of the explosive energy.
Then the winter came, and the Grasshopper died. And the Octopus ate all his acorns. Also, he got a racecar.
The company behind the technology is Andrews Space at this site.
From my (admitted limited) viewpoint as an (inexperienced) aerospace engineer, they look like the real thing.
The system is actually described in a 2003 AIAA conference paper linked on this page. The paper is titled "Mini-MagOrion: A Pulsed Nuclear Rocket for Crewed Solar System Exploration."
I've only glanced over the article so far, but it suggests specific impulses in the 10,000 seconds plus range. That's a critical measure of efficiency in a rocket that dictates the velocity it can obtain. The shuttle's SSMEs get about 455 seconds of specific impulse at a high thrust (millions of Newtons) and ion drives, like the one on the DS1 probe, and the like get specific impulses (Isp) of about 3000 seconds at low thrust. (millinewtons). Apparently the Mini-Mag Orion can produce thrust on par with the SSME. Yikes.
--sabre86
The word is damp. The infinitive is "to damp" and a device which damps is a damper. There's no need for the extra -en unless you want to have a confusing half-synonym for moisten.
Care to back that up? No source that I could find online supported your claim. All I found was this:
(from dict.die.net)
Source: Webster's Revised Unabridged Dictionary (1913)
Damp \Damp\, v. i. [imp. & p. p. Damped; p. pr. & vb. n.
Damping.] [OE. dampen to choke, suffocate. See Damp, n.]
2. To put out, as fire; to depress or deject; to deaden; to
cloud; to check or restrain, as action or vigor; to make
dull; to weaken; to discourage.
Source: Webster's Revised Unabridged Dictionary (1913)
Dampen \Damp"en\, v. t. [imp. & p. p. Dampened; p. pr. & vb.
n. Dampening.]
2. To depress; to check; to make dull; to lessen.
Dampen \Damp"en\, v. i.
To become damp; to deaden.
It would work just fine... that is, assuming it works at all. The photon drive has a little problem; namely, it requires about 300 megawatts of power to produce a Newton of thrust... and that's at 100% efficiency.
The Orion concept is much more technically feasable, barring any massive breakthroughs in materials and fusion power.
The meek may inherit the earth, but the strong shall take the stars.