SargeRho Posted September 2, 2015 Share Posted September 2, 2015 (edited) It's based on Robert Zubrin and Dana Andrews' work on the Magnetic Sail. I did remember the number incorrectly though, it's 12%, not 20%. The Terminal Velocity of a Bussard Ramjet appears to be the exhaust velocity of its engine. An Antimatter-Augmented Bussard Ramjet, or "Bussard Scramjet" would use a proton-antiproton drive, and carry the antiproton portion of its fuel internally, and have a much higher exhaust velocity. Edited September 2, 2015 by SargeRho Quote Link to comment Share on other sites More sharing options...
AngelLestat Posted September 2, 2015 Share Posted September 2, 2015 I read the robert zubrin paper on magnetic sails, I dont remember nothing of that mentioned.. But I ask for the source.. what? now I need to look it my self? XD Quote Link to comment Share on other sites More sharing options...
SargeRho Posted September 2, 2015 Share Posted September 2, 2015 http://www.projectrho.com/public_html/rocket/slowerlight.php#id--Go_Fast--Bussard_Ramjet Quote Link to comment Share on other sites More sharing options...
AngelLestat Posted September 2, 2015 Share Posted September 2, 2015 Lol, that is not a real source.. a source is a paper or scientist publication.That site is just a collection of rocket data from internet or novels. Many used for Role play games.I found a lot of errors in many sections in that site before. Quote Link to comment Share on other sites More sharing options...
K^2 Posted September 3, 2015 Share Posted September 3, 2015 Not true. A Bussard Ramjet could get up to 20% of the speed of light.None of the proposed systems have been able to generate thrust > drag at any speed that's sufficient for fusion, sorry.Angel, fact that ramming for matter for matter-antimatter drive is a bad idea is actually very easy to demonstrate. What might work way better is ramming for matter for an ion drive that you'll power with your matter-antimatter reactor. If you have no intention of going past 0.1c or so, that might actually work better than a pure matter-antimatter photon drive. Quote Link to comment Share on other sites More sharing options...
SargeRho Posted September 3, 2015 Share Posted September 3, 2015 I'm not too well versed in the kind of physics involved, but why is ramming for an P-AP drive a bad idea?More specifically, why not use the rammed protons in a Beamed Core drive? If I'm not mistaken, those aren't photon drives, since they use a magnetic nozzle to redirect the charged particles produced by proton/anti-proton annihilation. Quote Link to comment Share on other sites More sharing options...
shynung Posted September 3, 2015 Share Posted September 3, 2015 (edited) I think this discussion merits a thread of its own. I'll post one in a minute.EDIT: Here it is.Also, the missed questions:New question : The observable result of a B+ radioactive desintegration is a diffused spectrum right ? Not with stripes but some kind of curve instead ? (If this first assumption is wrong tell me already). If so, how is it possible since the positon/electron annihilation emits two 0,511MeV gamma-photons ? Those should result in a spectrum with stripes... There is no probabilist repartition of the energy(at this point)...It's not like the neutrino is being detected haha What is it? Can anyone enlighten me ? ThanksNow I have a question, how viable would the idea of storing heat in something like a diamond heatsink, and jettisoning that, to get rid of extreme heat peaks in a spacecraft, such as from firing a laser or some other high-energy system? Edited September 3, 2015 by shynung Quote Link to comment Share on other sites More sharing options...
Hcube Posted September 3, 2015 Share Posted September 3, 2015 (edited) -----Now I have a question, how viable would the idea of storing heat in something like a diamond heatsink, and jettisoning that, to get rid of extreme heat peaks in a spacecraft, such as from firing a laser or some other high-energy system?The only problem i can see is dumping diamonds into space you could probably build an efficient radiator for half the price (depending on how much diamond you jettison)EDIT : can anyone help me out with my radioactivity question there ? Pretty please... Edited September 3, 2015 by Hcube Quote Link to comment Share on other sites More sharing options...
SargeRho Posted September 3, 2015 Share Posted September 3, 2015 The only problem i can see is dumping diamonds into space you could probably build an efficient radiator for half the price (depending on how much diamond you jettison)Diamond isn't a very rare thing. Anything that can store a lot of heat, I only chose diamond because diamond heatsinks are a common thing in sci-fi.The idea is to avoid having large radiators exposed during combat, which are easily destroyed by weapons fire. Quote Link to comment Share on other sites More sharing options...
Rakaydos Posted September 3, 2015 Share Posted September 3, 2015 Rocket fuel makes the best heat sink. Quote Link to comment Share on other sites More sharing options...
QuesoExplosivo Posted September 3, 2015 Share Posted September 3, 2015 Ice would work better than diamond. It has a huge heat of fusion (334 J/g), and a high heat capacity to boot. Quote Link to comment Share on other sites More sharing options...
Superfluous J Posted September 3, 2015 Share Posted September 3, 2015 Ice would work better than diamond. It has a huge heat of fusion (334 J/g), and a high heat capacity to boot.And you don't have to buy ice from a cartel. Quote Link to comment Share on other sites More sharing options...
WestAir Posted September 4, 2015 Share Posted September 4, 2015 Is Starlite, the heat resistant polymer, a hoax? 10,000*C resistance seems pretty insane for any insulator. Quote Link to comment Share on other sites More sharing options...
Thomassino Posted September 12, 2015 Share Posted September 12, 2015 HelloI have just seen a bright flash of light in the night sky. It lasted for a less than half a second and was very bright (I'd say something around -5 magnitude) any idea what it could have been? I was wondering maybe a meteor heading right towards me or a piece of spinning space debris reflected sunlight... Quote Link to comment Share on other sites More sharing options...
SargeRho Posted September 12, 2015 Share Posted September 12, 2015 Probably a meteor, or reflections off of some satellite's solar panels. Quote Link to comment Share on other sites More sharing options...
MinimumSky5 Posted September 12, 2015 Share Posted September 12, 2015 HelloI have just seen a bright flash of light in the night sky. It lasted for a less than half a second and was very bright (I'd say something around -5 magnitude) any idea what it could have been? I was wondering maybe a meteor heading right towards me or a piece of spinning space debris reflected sunlight...Both of those are really the only thing that it could have been, but a flash from a satellite or debris is the most likely. Quote Link to comment Share on other sites More sharing options...
ChrisSpace Posted September 12, 2015 Share Posted September 12, 2015 Okay, so I have a question:Incandescent light bulbs produce their energy as about 90% heat and 10% light. Fluorescent light bulbs produce about 30% heat and 70% light (I think). But what about the sun? Of all the solar energy striking earth, how much is released as heat and how much as light? Quote Link to comment Share on other sites More sharing options...
Hcube Posted September 13, 2015 Share Posted September 13, 2015 Okay, so I have a question:Incandescent light bulbs produce their energy as about 90% heat and 10% light. Fluorescent light bulbs produce about 30% heat and 70% light (I think). But what about the sun? Of all the solar energy striking earth, how much is released as heat and how much as light?Well, not sure about the values, but the sun releases its energy in a vast range of different wavelengths including light and infrared, but also a lot of UV and probably some X-rays and energetic electromagnetic waves. So between all those different wavelengths, the percentage of it that is visible light is probably very low in terms of energy, especially considering that the sun emits a lot of UV, that are very energetic. Quote Link to comment Share on other sites More sharing options...
YNM Posted September 13, 2015 Share Posted September 13, 2015 Okay, so I have a question:Incandescent light bulbs produce their energy as about 90% heat and 10% light. Fluorescent light bulbs produce about 30% heat and 70% light (I think). But what about the sun? Of all the solar energy striking earth, how much is released as heat and how much as light?That'd directly follow Planck Distribution. I need to look up the values first though, thought almost 80% goes in visible and most of the rest goes in UV and IR (heat is IR).Anyway, I want to ask : is it possible to see a single meteor shower (uh, sounds too absurd ?) from the finder of a telescope ? The FoV is around 5 degrees and it looks quite slow... and quite dim (equal to mag +1 star). I observed it while pointing Alpheratz last night around 23 PM local time (GMT +7). Just wondering whether I truly have saw one or not. Quote Link to comment Share on other sites More sharing options...
shynung Posted September 18, 2015 Share Posted September 18, 2015 Anyway, I want to ask : is it possible to see a single meteor shower (uh, sounds too absurd ?) from the finder of a telescope ? The FoV is around 5 degrees and it looks quite slow... and quite dim (equal to mag +1 star). I observed it while pointing Alpheratz last night around 23 PM local time (GMT +7). Just wondering whether I truly have saw one or not.I'd like to ask something, but this one hasn't been answered. Quote Link to comment Share on other sites More sharing options...
passinglurker Posted September 18, 2015 Share Posted September 18, 2015 What is the estimated density of plutos atmosphere? Quote Link to comment Share on other sites More sharing options...
Blue Posted September 18, 2015 Share Posted September 18, 2015 Could a neutron star ever be put in Kerbal Space Program as a mod?If not, is there any technical reason which prohibits someone making a planet with a rotational period shorter than 5 seconds? Quote Link to comment Share on other sites More sharing options...
WestAir Posted September 18, 2015 Share Posted September 18, 2015 Don't neutron stars rotate faster than once per 5 seconds? I thought it was on the order of several hundred times per second. Quote Link to comment Share on other sites More sharing options...
Brotoro Posted September 18, 2015 Share Posted September 18, 2015 Pulsars slow down over time. An old one can have a rotation period over 5 seconds. Quote Link to comment Share on other sites More sharing options...
More Boosters Posted September 18, 2015 Share Posted September 18, 2015 Could a neutron star ever be put in Kerbal Space Program as a mod?If not, is there any technical reason which prohibits someone making a planet with a rotational period shorter than 5 seconds?There's already such a mod called Kerbal Galaxy. Also this isn't a science question. Quote Link to comment Share on other sites More sharing options...
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