02-24-2017, 01:20 AM | #11 |
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Join Date: Sep 2004
Location: Southeast NC
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
Russia's got it even worse, with their even further north launch site, and the most sensible trajectory passing through unfriendly Chinese airspace during assent. The need to be accessible from Baikonur is a big part of why the ISS is placed in such a highly inclined orbit.
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RyanW - Actually one normal sized guy in three tiny trenchcoats. |
03-02-2017, 10:52 AM | #12 | |
Join Date: Aug 2004
Location: Hamilton, Ont. CANADA
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
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Dalton “what sort of ΔV can we get from Pinot Grand Fenwick?” Spence
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04-04-2017, 09:29 AM | #13 | |
Join Date: Aug 2004
Location: Hamilton, Ont. CANADA
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
Quote:
Dalton “just when I think I'm getting it, what I get is confused” Spence
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04-04-2017, 09:39 AM | #14 | |
Join Date: Jul 2008
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
Quote:
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I don't know any 3e, so there is no chance that I am talking about 3e rules by accident. |
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04-04-2017, 10:30 AM | #15 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
The Oberth effect applies at both ends (it's not reverse).
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04-04-2017, 12:00 PM | #16 |
Join Date: Aug 2004
Location: Hamilton, Ont. CANADA
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
Mars Ve is 3.1 mps making Vo = 2.19, so ΔV = sqrt(3.1^2 + 1.6^2) - 2.19 = 1.3 mps. That makes the total ΔV for the trip = 2.27 + 0.6 + 1.3 = 4.17 mps, which according to my ΔV calculator spreadsheet would take 10 tanks of fuel with a TL8 NTR.
Dalton “did I get this right?” Spence
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04-04-2017, 12:09 PM | #17 |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
Note that the thrust of a TL 8 NTR is low enough that the limit case approximation isn't correct. I'm not aware of a simple solution for the moderate thrust case.
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04-05-2017, 06:57 AM | #18 | |
Join Date: Aug 2008
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
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After next spring, I may reprise the article with something more detailed, but I won't attempt this before I do more in depth study of the material. I probably won't present it through Pyramid unless Steven asks for it or there appears to be enough demand for something more math-heavy than the original.
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04-05-2017, 07:24 AM | #19 |
Join Date: Aug 2004
Location: Hamilton, Ont. CANADA
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
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04-05-2017, 10:49 AM | #20 | |
Join Date: Feb 2005
Location: Berkeley, CA
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Re: [Space, Spaceships] Total ΔV for Interplanetary Travel
Quote:
10 Gs: 3.6 km/s ΔV for a transfer orbit (less than 3.65 because I assumed an initial 200 altitude) 1 G: 3.65 km/s ΔV for a transfer orbit. 0.1G: 4.6 km/s ΔV for a transfer orbit. 0.01G: 6.9 km/s ΔV for a transfer orbit. 0.001G: 8.4 km/s ΔV for a transfer orbit. 0.0001G: 9.4 km/s ΔV for a transfer orbit. |
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space, spaceships |
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