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Topic: Fission sail

  A Small Problem of Propulsion - - science news articles online technology magazine articles A Small Problem of ...   (Site not responding. Last check: 2007-10-23)
Fission needs to be contained by an elaborate reactor, which would melt under the high temperatures required for propulsion.
Of course, the laser would still be pushing on the central sail in a direction away from the solar system, but since the outer ring covers an area nine times bigger than the inner two, its decelerating force would win out.
The spacecraft’s sail, built from wire and aluminum foil, would need to be large enough to catch momentum from the laser beam--around 600 miles in diameter, says Forward, which is a little bigger than the state of Texas.
www.discover.com /issues/oct-95/features/asmallproblemofp575   (4867 words)

 Final Gallery
Square sails designed for robotic exploration missions would have dimensions on the order of several 10s of meters to a few kilometers; sails designed to transport cargo in support of piloted missions would have dimensions of several kilometers because the cargo payloads are heavier than robotic spacecraft.
Deployment of heliogyro sails is accomplished by the centrifugal force associated with the vehicle, causing the sail material to unroll from the drum.
This sail is similar to the square sail in that it does not rotate, but instead of using deployable booms for structural integrity, it uses an inflatable torus to support the thin-sheet sail material, and inflatable booms for payload attachment, which is much lighter than the traditional steel booms.
aerospacescholars.jsc.nasa.gov /has/Students/finalgall.cfm?id=547   (945 words)

 Interplanetary Travel: An Intro (with Equations)
Although there are theoretical maneuvers to send a solar sail at several gees of acceleration (a perihelion boost, for example), for the most part a solar sail is a low-acceleration craft.
For a circular sail craft whose total mass is M and whose sail radius is R, the acceleration outward from the sun is:
From a practical standpoint, solar sails require no external fuel and are very reusable; they can be slow, but might be well-suited to automated deliveries and courier runs for materials that have no time limit.
www.geocities.com /Area51/Chamber/2838/space.html   (2719 words)

 Star Trek - - science news articles online technology magazine articles Star Trek   (Site not responding. Last check: 2007-10-23)
Fission and fusion reactions convert just a fraction of 1 percent of their mass into energy.
Fusion reactors potentially produce less unwanted radiation, and they should be easier to fuel: They run on deuterium (heavy hydrogen) and helium 3 (a lighter version of ordinary helium), both of which exist in large quantities on the surface of the moon and in the atmosphere of Jupiter.
Frisbee's sail needs to be large in part to dissipate heat from the enormous energy of the incoming laser beam.
www.discover.com /issues/aug-03/cover   (4341 words)

 [No title]
It is now widely recognized that sunlight does indeed produce a force which moves comet tails and a large, reflective sail could be a practical means of propelling a spacecraft.
Solar sailing is a kind of technology which enables probes to move through space ten times faster than even the Voyager spacecraft,--38,000 miles an hour.
With the power available from nuclear reactors, whether fission or fusion, you can comfortably reach speeds on the order of 100 kilometers [60 miles] a second or so which allows you to go more or less anywhere you want in the solar system within a couple of years, maybe even quicker.
www.astrobio.net /cgi-bin/robotxls.cgi?sid=95&ext=.xls   (1672 words)

 Alternate View Column AV-56
Fissionable isotopes in such concentrations can easily produce great heat from fission reactions or even a nuclear explosion.
The fuel tank would be made from long tubes of boron carbonate, a strong structural material that strongly absorbs thermal neutrons, preventing the fission chain reaction that would otherwise occur in the fuel.
The fuel has only low-level alpha activity, the fission products from the consumed fuel are vented into space, and the induced activity from the large neutron flux produced by the fission burning can be minimized by constructing the engine from such low activation materials as graphite and silicon carbide.
www.npl.washington.edu /AV/altvw56.html   (1700 words)

There are several types of nuclear fission or fusion powered rocket engine designs, some of which have already been built and tested.
Fission engines, whether using solid, liquid, or gaseous fissionable material in the reactor cores, are not very good in terms of specific impulse.
Solar sail starships, propelled by the pressure of starlight against a large reflective sail, obviate the need to carry fuel, or even a main propulsion engine at all.
www.users.globalnet.co.uk /~hex/ufo/text/pages026-050/page47.html   (1196 words)

 Solar sails in Edexcel - Bad Astronomy and Universe Today Forum
How close can your sails get to the sun (if they're getting 10 N at 1 au it seems there are reflectivity losses, or else your sails have holes in them).
I'm guessing that a solar sail might be ok for flyby missions to the outer planets, but it's not going to do too way for orbiters much past Jupiter.
For a solar sail, you'd have to turn around somewhat before the half point due to the lower intensity of the sun.
www.bautforum.com /showthread.php?t=4716   (1697 words)

 Centauri Dreams » Blog Archive » An Antimatter-Driven Sail to the Kuiper Belt
Sails and nuclear reactions have been paired before; in particular, in Johndale Solem’s Project Minerva, which posited setting off a nuclear explosion behind the sail to drive a spacecraft.
The sail would be a mixture of graphite and a new carbon-fiber material commonly known as carbon-carbon fused together, with tiny amounts of uranium impregnated in the material.
The antimatter reacts with the uranium to produce neutrons and various secondary emissions, fission fragments that leave the sail at enormous speeds.
www.centauri-dreams.org /?p=28   (843 words)

 Takeoff | Scientific Cage ©
The use of space fission systems must not adversely affect mission safety and safety features must be obvious to regulators and the public.
For those who don't know: a solar sail is a propulsion concept which makes use of a flat surface of very thin reflective material supported by a lightweight deployable structure.
What makes solar sails attractive is the fact that they do not use propellant (sun light is in fact their propellant).
www.scientificcage.com /doc/takeoff_20001007.html   (1382 words)

 The Outer Rim: Paradigm   (Site not responding. Last check: 2007-10-23)
The principle of nuclear pulse propulsion is simply setting off a series of nuclear fission explosions at regular time intervals letting the force of the explosions move the craft along.
The principle behind the solar sail is to construct a thin film of a highly reflective sheet of light material such as Mylar or Kevlar.
To lessen the structural requirements of a solar sail further is to construct it in orbit.
outer-rim.lweb.net /paradigm/archives/33jekel.html   (4335 words)

 Space Colonization and the Future of Human Evolution
Solar sails, for instance, are very lightweight, looking like nothing more than large fans made of tissue-thin foil.
The idea of solar sails has been around since the early 1970s, but only now are they becoming reality, said Louis Friedman, executive director of the Planetary Society, a nonprofit group devoted to solar system exploration.
Solar sails work because particles of sunlight bounce off the ultralight wings, gently pushing the spacecraft in a particular direction.
www.human-evolution.org /startravelhow.php   (1600 words)

 SPACE.com -- Antimatter Power: Reaching for Deep Space
First, the sail itself is considerably smaller than a several miles-wide solar sail.
With a diameter of 15 feet (5 meters), the antimatter sail is wonderfully compact.
First of course are the tiny explosions as the antimatter particles collide with the sail.
space.com /businesstechnology/technology/antimatter_sail_021029.html   (855 words)

 Final Gallery
It has been proposed that a method of using this antimatter as a form of fission could be used for deep space missions.
Robert Forward suggested that a 10-million-gigawatt laser be used to shine on a large sail through a lense which would move the craft through space very quickly.
Anti-matter sails and light sales are just two of the very many potential propulsion methods being researched now.
aerospacescholars.jsc.nasa.gov /has/Students/finalGall.cfm?id=3974   (884 words)

 Where Do We Go From Here - By L. Neil Smith - Price of Liberty
The laser sail is doomed by the fact that building a 6,600-mile-wide collecting mirror is simply not feasible, and...
a 600-mile-wide sail would be torn apart by cosmic debris on a daily basis.
Venus will never be inhabitable and neither will Mars or any of the Jovian planets or their moons, and changing the environment on another planet will never be within our capabilities.
www.thepriceofliberty.org /03/10/14/lneilsmith.htm   (2138 words)

 Nuclear electric rocket - Wikipedia, the free encyclopedia
Since this style of reactor produces high power without heavy castings to contain high pressures, it is well suited to spacecraft.
See also: spacecraft propulsion, nuclear reactor, radioisotope thermoelectric generator, Ion thruster, Magnetic sail
Spacecraft Antimatter catalyzed nuclear pulse propulsion • Bussard ramjet • Fission-fragment rocket • Fission sail • Fusion rocket • Gas core reactor rocket •
en.wikipedia.org /wiki/Nuclear_electric_rocket   (317 words)

 H - Heinlein Concordance
She was infected by the puppet master that escaped from the Section's biology lab.
Skyblast Freight (In To Sail Beyond the Sunset, Maureen Johnson was a director in 1970.)
The administrators of the trust attempted to satisfy this mandate by offering inducements to offspring of long-lived people to interbreed, assuming that their long lifespans may be hereditary.
pw1.netcom.com /~mecowan/hc/H_HC.htm   (6765 words)

 SPACE.com -- Looking to Lasers, Microwaves and Anti-Matter for Space Travel
The Hbar proposal is to utilize antiproton-induced fission to directly propel a small sail.
By illuminating a thin foil of uranium with a stream of antiprotons, a million second propulsion system will be created - with no high temperatures, no magnetic fields, and no massive power supplies.
The researchers envision a lightweight sail that holds a trap of antimatter using a series of lightweight cables.
www.space.com /businesstechnology/technology/fof_physics_031126-2.html   (1113 words)

 Monday Night Football - Franco Harris, Julius Caesar, and The World’s Most Beautiful Woman
Had it not, and had they cracked the secret of fission while working in Italy in 1934, the outcome of WWII might have been very different, giving the Axis the key to The Bomb years ahead of the United States.
Once there, he became aware of the possibilities of nuclear fission and quickly got in contact with President Roosevelt, warning him that Germany could someday have an atomic weapon.
A year later, Elcano set sail again, this time with 16 couples determined to have a wild time on the high seas as they competed to win one million doubloons.
espn.go.com /abcsports/mnf/s/annotatedmiller/011030.html   (2091 words)

 Advanced Space Propulsion Workshop begins this week   (Site not responding. Last check: 2007-10-23)
This year's sessions are packed full with scientists who will share their research and new ideas about how humans and robotic probes will cross the gulf of space to other planets and stars.
Topics include advanced chemical propulsion, nuclear fission propulsion, solar sails, tethers, micropropulsion, advanced electrical propulsion, and fusion propulsion.
The second will discuss nuclear fission, with one paper specifically concerning how we can safely test fission thermal rockets on the ground.
spacescience.com /headlines/y2000/ast31may_1m.htm   (1253 words)

 History and Development of the Rocket Engine
solar sails provide very low but inexhaustible thrust; an interplanetary vehicle using one of these methods would follow a rather different trajectory, either constantly thrusting against its direction of motion in order to decrease its distance from the Sun or constantly thrusting along its direction of motion to increase its distance from the Sun.
Antimatter catalyzed nuclear pulse propulsion (fission and/or fusion energy)
The sail would be half a kilometer wide.
www.edinformatics.com /inventions_inventors/rocket_engine.htm   (3031 words)

 Interstellar Transport
Space sails (e.g., relying on laser-beamed power from the Solar System instead of carrying it along) require very large and low density sails that are difficult to deploy and control.
Under current proposals, the annihilation of matter with antimatter is 10 billion times more efficient than the oxygen-hydrogen combustion in the Space Shuttle's main engines, and about 100 times more than fission or fusion reactions.
However, small amounts of antimatter would be useful for initiating and maintaining fission or fusion reactions in hybrid rockets.
chview.nova.org /station/interste.htm   (575 words)

 solar sail
MORE Another Solar Sail Failure Yet another Russian attempt to launch a controlled craft powered by solar sail has failed, not due to any problem with the sail itself, but through failure in the...
In most designs, steering would be done with auxiliary vanes, acting as small solar sails to change the attitude of the large solar sail (see the vanes on the illustration).
Encyclopedia Entry for solar sail Dictionary Definition of solar sail Solar sail Solar sails (also called light sails, especially when they use light sources other than the Sun) are a proposed form...
www.solarfile.com /solarsail   (1707 words)

 HobbySpace - New & Proposed Launch & Propulsion
Sailing through space on microwaves: Brothers plan to be first to use beamed energy as flying fuel - Huntsville TImes - Nov.7.02
They intended to send a solar sail with personal mementos from the public into deep space.
Japanese deploy solar sails: Origami' technique boosts pioneering propulsion technology.
www.hobbyspace.com /Links/LaunchPropulsion1.html   (3814 words)

 Mars Q&A - May 2000
If we consider where this energy were to come from, there are really only two possibilities: a nuclear reactor, either fission or fusion, or perhaps controlled micro antimatter detonations.
For example, fission reactor engine prototypes in the 70s used the fission of uranium or plutonium to heat up hydrogen gas until it is in a plasma state (all the electrons are sheared off) and then expel it through a nozzle at the back of the ship, thereby producing thrust.
Unfortunately, one of the main reasons we have not actively pursued nuclear power technology for space missions is the possible explosion and crash of the rocket during takeoff, thereby spreading radioactive debris over large areas of the Earth and creating an ecological disaster.
chapters.marssociety.org /youth/mc/issue4/qa.php3   (621 words)

 [No title]
Continuous pressure from sunlight would ultimately accelerate the craft to speeds about five times higher than possible with conventional rockets -- without requiring any fuel.
To go ten times faster than that begins to get to a potentially practical rapid transit system for our local neighborhood in space, but also even to go to other stars.
Freeman: I think you can probably do better using magnetic fields, but that we will learn in due time.
www.astrobio.net /cgi-bin/xml.cgi?sid=581&ext=.html   (1720 words)

 Unified Earth Space Council Network: Chapter 5   (Site not responding. Last check: 2007-10-23)
Fusion reactors require only water, fossil fuels can be produced synthetically, solar panels have been made extremely efficient, and fission fuels such as uranium and plutonium can have their decay rates increased through advanced chemical processes, allowing fission waste to be safely destroyed.
Solar sails are gigantic (several miles in diameter), very thin plastic sails attached to ships, which actually use the minute push generated by light to move.
Thus, sails are highly specialized and much less versatile than a standard fusion rocket system.
www.stanford.edu /~maxe/rpg/marathon/chapter5.html   (10668 words)

 Orion (Paul F. Dietz; Andrew Higgins; Henry Spencer)
Where as some fissionable or >like material was dropped out the back, and it went boom and cause of >the giant plate on the rear of the craft it went forward?
It is of some interest, because it makes it possible to use smaller bombs.
(Orthodox fission bombs are hard to make at small sizes, except by taking a larger bomb and spoiling its efficiency, which is dirty and costly.) -- The good old days
yarchive.net /space/exotic/orion.html   (1903 words)

 Table of contents for Library of Congress control number 2001099145
Hoyt MISSIONS AND CONCEPTS: SOLAR SAILS GeoSail: A Novel Solar Sail Mission Concept for Geospace.......................................
Hoyt FISSION PROPULSION SYSTEMS Cosponsored by: Conference on Transportation Systems AND the 19th Symposium on Space Nuclear Power and Propulsion Design and Analysis of the SAFE-400 Space Fission Reactor....................................
Jones and R. Lorenz FISSION POWER SYSTEMS A Probability Analysis of Space Radiator Segmenting for Increased Reliability and Reduced Mass..........
www.loc.gov /catdir/toc/fy032/2001099145.html   (2687 words)

 [No title]
Isaac Newton, Atomic Theory, Nuclear Fission, Manhattan Project, Nuclear Power, Nuclear Plant, Fusion Power Gunpowder
Nuclear Fission, Manhattan Project, Nuclear Power, Nuclear Plant, Fusion Power Explosives
Labor Union, Submarine, Mass Transit, Recycling, Nuclear Fission, Mech Infantry, Recycling Center, Manhattan Project, Nuclear Power, Nuclear Plant, Superconductor, Fusion Power, SDI Defence Advanced Flight
www.a2zcheat.com /cheats/pc/c/civilization-advances-lst-ano.txt   (446 words)

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