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Post by The Astronomer on May 26, 2017 5:12:15 GMT
You know, somebody will eventually have to suggest this.  |
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Post by Fgdfgfthgr on May 26, 2017 5:24:20 GMT
How fast its exhaust velocity can go? Is there any scientific measurement for it?
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Post by Fgdfgfthgr on May 26, 2017 5:25:15 GMT
At least you can use Lithium to make rocket, lighter than Potassium!
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Post by The Astronomer on May 26, 2017 5:28:24 GMT
How fast its exhaust velocity can go? Is there any scientific measurement for it? Not very fast. I doubt there's any data about this reaction too. |
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Post by AdmiralObvious on May 26, 2017 6:04:45 GMT
I'm pretty sure the chemical reaction has something to do with Carbon Dioxide in the drink, Sodium in the tablet, and a few of the other ingredients within the Mento (there's one or two other reacting agents I know of, but forgot the name of).
Last time I did it, uncapped the exhaust velocity was probably around 10 m/s.
Them there's the time when I was younger, capped the bottle off and the cap detonated, which made the liquid shoot way further, and propel the bottle down the street. No clue how fast though.
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Post by goduranus on May 26, 2017 8:24:40 GMT
This thread does bring a serious suggestion with it: mixtures and solutions for thermal rockets. What if instead of just feeding water into the NTR, you feed it a mixture of sugar, sodium, lithium etc dissolved in water? Or some sort of alcohol/water mixture? With the right mix might you be able to increase the propellant density in the tank, or obtain some other performance improvements over using a pure mixture?
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Post by samchiu2000 on May 26, 2017 10:42:07 GMT
Is it possible to mod it in COADE? After all we manage to somehow modded the fusion and NSWR torch drive, and it's time for something relatively low tech  |
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Post by nerd1000 on May 26, 2017 14:14:21 GMT
Project Rho has a similar calculation for beer, which gives a exhaust velocity of 83m/s and thrust around 84N.
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Post by lorentz99 on May 26, 2017 16:44:22 GMT
This thread does bring a serious suggestion with it: mixtures and solutions for thermal rockets. What if instead of just feeding water into the NTR, you feed it a mixture of sugar, sodium, lithium etc dissolved in water? Or some sort of alcohol/water mixture? With the right mix might you be able to increase the propellant density in the tank, or obtain some other performance improvements over using a pure mixture? I'm not an expert, but I don't think that using solutions in thermal rockets would do any good. The solved materials would form lime in the ducts, turbopumps, in the core..., and on every other surface. |
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Post by Enderminion on May 26, 2017 18:47:18 GMT
This thread does bring a serious suggestion with it: mixtures and solutions for thermal rockets. What if instead of just feeding water into the NTR, you feed it a mixture of sugar, sodium, lithium etc dissolved in water? Or some sort of alcohol/water mixture? With the right mix might you be able to increase the propellant density in the tank, or obtain some other performance improvements over using a pure mixture? I'm not an expert, but I don't think that using solutions in thermal rockets would do any good. The solved materials would form lime in the ducts, turbopumps, in the core..., and on every other surface. they'd be heated to ~3000k |
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Post by lorentz99 on May 26, 2017 18:56:14 GMT
I'm not an expert, but I don't think that using solutions in thermal rockets would do any good. The solved materials would form lime in the ducts, turbopumps, in the core..., and on every other surface. they'd be heated to ~3000k What do you mean with that? Of course, it is possible that the lime gets vaporized/fragmented from the core, but what about the pre-core part, where the propelant is not too hot. (Fuel ducts, tanks, regenerative cooling...) |
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Post by sweetiebot on May 27, 2017 21:26:43 GMT
I'm pretty sure the chemical reaction has something to do with Carbon Dioxide in the drink, Sodium in the tablet, and a few of the other ingredients within the Mento (there's one or two other reacting agents I know of, but forgot the name of). Last time I did it, uncapped the exhaust velocity was probably around 10 m/s. Them there's the time when I was younger, capped the bottle off and the cap detonated, which made the liquid shoot way further, and propel the bottle down the street. No clue how fast though. That's because you did an experiment at atmospheric pressure, if you do that Under vacuum， it should much faster |
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Post by AdmiralObvious on May 27, 2017 22:32:46 GMT
I'm pretty sure the chemical reaction has something to do with Carbon Dioxide in the drink, Sodium in the tablet, and a few of the other ingredients within the Mento (there's one or two other reacting agents I know of, but forgot the name of). Last time I did it, uncapped the exhaust velocity was probably around 10 m/s. Them there's the time when I was younger, capped the bottle off and the cap detonated, which made the liquid shoot way further, and propel the bottle down the street. No clue how fast though. That's because you did an experiment at atmospheric pressure, if you do that Under vacuum， it should much faster True. We should petition NASA to test it in their special vaccum chamber at JPL. |
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Post by RiftandRend on May 28, 2017 10:44:50 GMT
If I'm not mistaken soda + Mentos was mostly a physical reaction. The highly irregular surface of the mentos allows CO2 gas to come out of solution.
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Post by ash19256 on May 28, 2017 21:34:46 GMT
If I'm not mistaken soda + Mentos was mostly a physical reaction. The highly irregular surface of the mentos allows CO2 gas to come out of solution. According to Mythbusters, it's a mix of that and chemical reactions acting as a catalyst. |
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