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Post by Kerr on Jun 16, 2017 17:47:07 GMT
Hello! I want to talk about the possibility of using RAIR ships/RKKV. Or also know as Bussard Scramjets. Compared to: Bussard Ramjets. Pro: Heavily decreased drag, allowing velocities higher than 12% c. Con: You have to carry fuel, but on the flip side you have infinite reaction mass.
If we use use a 10kmĀ² scoop we can collect 1mg hydrogen per second. Using a 1GW Reactor we can Z-pinch this little amount of hydrogen with a magnetic compression energy of one 1 terajoule/gram. Creating 35,1 kN of Thrust through the fusion. Giving the 100t ship an acceleration of 0.351m/s. With an acceleration distance of 30 light years the RAIR will reach 76,5% of C. Ending up with a relativistic energy density of 12MT per kg.
What do you think about it?
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Post by dragonkid11 on Jun 17, 2017 1:01:28 GMT
Ramscoop simply does not work in real life, you need a scoop that is way too damn big and heavy to get a tiny amount of fuel for your ship.
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Post by The Astronomer on Jun 17, 2017 2:03:57 GMT
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Post by lennson on Jun 17, 2017 3:14:01 GMT
Ramscoop simply does not work in real life, you need a scoop that is way too damn big and heavy to get a tiny amount of fuel for your ship. Wouldn't you use a magnetic field instead of a physical scoop? If so, isn't the main limitation how good of a super conductor you can make to produce the magnetic field?
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Post by Kerr on Jun 17, 2017 4:33:41 GMT
Ramscoop simply does not work in real life, you need a scoop that is way too damn big and heavy to get a tiny amount of fuel for your ship. I am not planning to build an actual giant scoop, just an big magnetic ring. Only weighing a few tons. The amount won't be that tiny, considering the the rocket is accelerated to 0.1c before it starts the RAIR system.
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Post by Kerr on Jun 17, 2017 4:36:42 GMT
How much antimatter does it need to activate its drive?
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Post by thorneel on Jun 17, 2017 9:37:13 GMT
How much antimatter does it need to activate its drive? None, as this is an entirely fictional craft (with horizontal layout ffs) some unscrupulous people tried to use as "proof" that NASA was working on warp drive. An actual alcubierre warp drive would need an unknown but probably immense amount of antimatter (at first it was a Jupiter mass, but it has apparently been reduced since then), in addition to still purely hypothetical negative matter. It would also need to resist the arbitrarily high amount of radiations that will fill the bubble, something on the other side to stop it as it cannot by itself, and said something also arbitrarily resistant to radiation as every atom or dust grain the bubble collected on its way are instantly turned into a gamma ray flash. And a vertical layout.
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Post by Kerr on Jun 17, 2017 9:52:43 GMT
How much antimatter does it need to activate its drive? None, as this is an entirely fictional craft (with horizontal layout ffs) some unscrupulous people tried to use as "proof" that NASA was working on warp drive. An actual alcubierre warp drive would need an unknown but probably immense amount of antimatter (at first it was a Jupiter mass, but it has apparently been reduced since then), in addition to still purely hypothetical negative matter. It would also need to resist the arbitrarily high amount of radiations that will fill the bubble, something on the other side to stop it as it cannot by itself, and said something also arbitrarily resistant to radiation as every atom or dust grain the bubble collected on its way are instantly turned into a gamma ray flash. And a vertical layout. The Alcubierre drive? I don't think any FTL is feasible. Negative matter? Doesn't it have some inertia and KE defying properties on it's own? Matter attracts neg-matter, neg-matter repels matter. Producing movement. Wasn't the bubble also extremely hot? Like few seconds after the big bang?
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Post by The Astronomer on Jun 17, 2017 10:13:40 GMT
Reactionless drive is the only way to actually get over the rocket equation, and we don't even know if it's even possible. You won't be escaping the tyranny of the rocket equation anytime soon.
Space ramjet may be useful when you're arriving at the destination, though. Get fusion fuel and slow down your spacecraft on arrival. One of the reason we should try 4p fusion.
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Post by Kerr on Jun 17, 2017 11:25:03 GMT
Reactionless drive is the only way to actually get over the rocket equation, and we don't even know if it's even possible. You won't be escaping the tyranny of the rocket equation anytime soon. Space ramjet may be useful when you're arriving at the destination, though. Get fusion fuel and slow down your spacecraft on arrival. One of the reason we should try 4p fusion. Ok, and what about Space Scramjets? The Bussard Ramjet is very flawed. Any ship with fourton power and a mass ratio higher than 3 has a higher Dv/Vmax than a Ramjet.
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Post by srbrant on Jun 20, 2017 6:02:36 GMT
"Reactionless drives."
(Takes pipe out of mouth) Son, let me tell you a story. It's called "The Killing Star."
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Post by EshaNas on Jun 20, 2017 11:14:09 GMT
The Alcubierre drive need not be FTL. If you could fold space to .9c, that'll still be something of massive interest. Like how Orion's Arm does it, none of their warpships breach 1c, they just get close to it.
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Post by RiftandRend on Jun 21, 2017 1:19:31 GMT
Alcubierre drives are not very useful systems. Any material in your "path" would become a black hole pushed by the edge of your warp bubble. When you shut it down you have a black hole a few hundred meters from your ship, instantly destroying you and likely your destination as well.
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Post by Enderminion on Jun 21, 2017 2:48:26 GMT
ah but star trek deflectors would help
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Post by apophys on Jun 21, 2017 3:47:02 GMT
ah but star trek deflectors would help
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