Category Archives: Uncategorized

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

Posted in Uncategorized | 23 Comments

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

Posted in Uncategorized | 2 Comments

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

Posted in Uncategorized | 7 Comments

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

Posted in Uncategorized | 5 Comments

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

Posted in Uncategorized | 8 Comments

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

Posted in Uncategorized | 2 Comments

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

Posted in Uncategorized | 10 Comments

Electric Inducer Pump

It takes pressure in the tank to suppress cavitation in the pumps for rocket engines. It is customary to use helium for most pressurization due to its’ low molecular weight. Unfortunately, it can take a lot of helium in some … Continue reading

Posted in Uncategorized | 6 Comments

Notchbell Nozzle

Several years back I suggested a type of compensating nozzle that should be inexpensive to build and test. Unfortunately the ones I made for demonstration with compressed air were hit and miss as I didn’t have the theory quite right. … Continue reading

Posted in Uncategorized | 9 Comments

Old Engines

Some before, and many after the accident criticized the use of old engines for the Antares. Many references were made to the long storage time with some mention of them as antiques. The refurbishment of these engines didn’t seem to … Continue reading

Posted in Uncategorized | 3 Comments