Category Archives: Uncategorized

Laundry in Microgravity

The lack of laundry facilities in orbit was brought up recently and it occurred to me that ┬áthis lack seems to be more for lack of trying than real difficulty. The lack of trying that I suspect could be because … Continue reading

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Refueling for the Secondary Mission

It is fairly obvious that there are many benefits to having refueling capabilities in space. Perhaps not to the monster rocket fanatics with blinders and a few others, but to most of us it approaches no-brainer territory. The problem is … Continue reading

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Lunar Foxhole

Rereading some of the older posts on Lunar exploration, I ran into a lot of discussion on short term vs permanent outposts or bases. The assumption seems to be that short sortie missions will have minimal or even no radiation … Continue reading

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Missing Destination, Missing Opportunity

It looks to be months from the time that SpaceX claimed to have solved the problem that caused the vehicle loss of September 1 until the actual return to flight. There are stories to the effect that the delays are … Continue reading

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Space-based Bitcoin Mining

Preface: if you’re a bitcoin expert, gird your loins because I’m probably going to be making a LOT of technical errors in this post. So: space based solar power, but instead of beaming the power to Earth, we mine bitcoin … Continue reading

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Indifference

I reread several times Jons’ post on NASA under the next administration that recommends against having NASA focus on anything one finds important. I think he made good points throughout and it should have made for lively discussion. I didn’t … Continue reading

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Energy needed to get to orbit using various fuels from various planets.

EDIT: I made a big mistake on how I calculate bulk density. I’ll fix it. EDIT AGAIN: I fixed it. I think. I will pick stoichiometric mixes, oxygen as oxidizer and fuels of hydrogen, methane, and carbon monoxide. The three … Continue reading

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Reverse Rocket

This is a post about an idea by Doug Plata. His idea is to put multiple propellant tanks on top with just enough structure to keep them intact and drop them in pairs as they drain. Under the tanks is … Continue reading

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Getting My Numbers

This is an explanation of how I get BOTE numbers for such things as the comparison between LH2 and CH4 propellants as in Jons’ last post. The focus Jon had was how much H2 do you need to carry to … Continue reading

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Semi-Staged Combustion

It is interesting comparing the two best known first stages in the US that use kerosene and LOX. The Atlas 5 and the Falcon 9 use a similar fuel in their first stages and then diverge in the technical aspects. … Continue reading

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