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Fred J. McCall wrote:
[snip] :The Russians have been transferring storable hypergolic fuel and oxidizer :from Progress tankers to their stations (including ISS) for years. No EVA ![]() Now you might want to look at the thrust developed and burn durations. I don't see any of those vehicles going to the Moon, landing, and then taking back off. So let me get this straight: scaling up from the several hundred kgs the russian progress routinely transfers to the ISS http://www.russianspaceweb.com/progress.html to the tens of tons required for a lunar mission is so complex that it can't be possibly be finished until 2018. But building a huge heavy lift vehicle out of shuttle components has negible technological risk? Orbital propellant transfer of storable propellants and even mild cryogens such as liquid oxygen and liquid methane is not that hard. There are even materials which remain flexible at liquid oxygen temperatures, so you could use a simple bladder system. It is just that nobody has ever seriously tried to do it. |
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