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Post by The Astronomer on Apr 6, 2017 13:48:16 GMT
I happened to stumble upon a thread in the Kerbal Space Program forums about creating a plausible near future SSTO. They mostly discuss about choosing NTR coolant, and due to some computer problems, I have to go blind (and fail). Forum topic: "Near" Future/"hard-sci fi", low infrastructure, SSTOsSituation: This is military situation, so slight radiation is allowed, thus the NTR. They are looking for remass that is easy to find in the environment, and is simple to manufacture/collect, ruling out hydrolox, fluorine, RP-1 and our conventional stuffs. Topics:NTR fuelAmmonia - exhaust v ( gedzilla = ~4.31 km/s, TWR = 47.4 gee) Water - exhaust v ( gedzilla = ~4.16 km/s, TWR = 173 gee) Hydrazine - exhaust v ( gedzilla = ~3.29 km/s, TWR = 138 gee) I wonder how well would an NTR fare in Earth's atmosphere...
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Post by bigbombr on Apr 6, 2017 13:57:50 GMT
A Fluor-RP-1 chemical engine seems better. For SSTO, you want to pack as much delta-v in as little volume as possible.
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Post by The Astronomer on Apr 6, 2017 14:03:36 GMT
Can you guys check water/ammonia NTR exhaust velocity for me?
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Post by gedzilla on Apr 6, 2017 14:11:40 GMT
A Fluor-RP-1 chemical engine seems better. For SSTO, you want to pack as much delta-v in as little volume as possible. If so Decane seems the way to go. its got an exit velocity of roughly 5.4km/s but its amazingly dense
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Post by The Astronomer on Apr 6, 2017 14:14:15 GMT
Guys, please test water/ammonia NTRs for me. I need to know their exhaust velocity.
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Post by gedzilla on Apr 6, 2017 14:15:18 GMT
ill try water i guess...
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Post by gedzilla on Apr 6, 2017 14:17:09 GMT
Guys, please test water/ammonia NTRs for me. I need to know their exhaust velocity. about how many MN do u want ?
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Post by gedzilla on Apr 6, 2017 14:21:25 GMT
Water seems to have a shitty exit velocity, about 3.8km/s
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Post by The Astronomer on Apr 6, 2017 14:21:36 GMT
Guys, please test water/ammonia NTRs for me. I need to know their exhaust velocity. about how many MN do u want ? Just exhaust velocity, please. Also, please post the picture of the results.
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Post by gedzilla on Apr 6, 2017 14:25:09 GMT
Ammonia seems to have a exit velocity of about 4.3km/s
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Post by gedzilla on Apr 6, 2017 14:25:42 GMT
about how many MN do u want ? Just exhaust velocity, please. Also, please post the picture of the results. Isnt the forum attachment limit full ?
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Post by The Astronomer on Apr 6, 2017 14:28:29 GMT
Just exhaust velocity, please. Also, please post the picture of the results. Isnt the forum attachment limit full ? oh. Why? Are there limits? Also, I guess we have to test the thrust, too. I want to see their thrust comparing to our conventional remasses. What are your rockets' nozzle expansion ratio and angle?
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Post by gedzilla on Apr 6, 2017 14:34:55 GMT
give me a minute
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Post by gedzilla on Apr 6, 2017 14:41:30 GMT
fyi, with some more fillding, i got waters exit v to 4.15km/s
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Post by gedzilla on Apr 6, 2017 14:43:00 GMT
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