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21
SpaceX Starship Program / Re: Mars Crater Village
« Last post by docmordrid on Today at 02:45 am »
Children first: congratulations, you now have a cohort of children your colony is not capable of adequately raising.

Then you can abandon building industry and send the children back to Earth.

Assuming children born and raised in Martian gravity experience normal bone development, but that can't be guaranteed until you try it. They may end up with spindly, weak bones, an underdeveloped musculature and circulatory system which may not support survival on Earth.

Not saying they will, but it might be useful to try it on primates first.
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The launch path appears to cross over some of the Bahamian land mass.  That does not seem prudent unless SpaceX can guarantee with 100% certainty (I doubt that they can) that there is no possibility of a booster failure that could have debris landing on Bahamian soil.

I am sure you realize that no one can make that claim about vehicle reliability. Cars, airplanes, bicycles, and boats/ships have witnessed death and destruction every year, all of these have been in operation for over a hundred years. The question should be: "Has reliability improved to the point of safe overflight?" As of today's date (21 April 2024), there have been 306 successful consecutive launches , and 299 (nonconsecutive) successful landings. Apparently this is a reasonable operations record for the government of the Bahamas.

Edit: I forgot trains.
23
Forward planetary protection apparently usually costs 1-10% of the total cost of a Mars mission: https://sites.nationalacademies.org/cs/groups/ssbsite/documents/webpage/ssb_180771.pdf. One consequence of that is the program of record probably won't suddenly become affordable just because forward planetary protection has been waived. To meet the budget we probably need to reuse systems that weren't engineered with planetary protection in mind. Adding planetary protection after the fact is probably a lot more expensive than engineering it from the beginning. So waiving forward planetary protection will probably cut costs by more than 1-10%.
25
Advanced Concepts / Exodus Propulsion with Dr Charles Buhler
« Last post by QuantumG on Today at 12:34 am »
It's all about that "electrostatic pressure" and there's even a patent this time.

Here's an easy intro:

Not tested in space yet. No idea what their plans are. Dozens of other articles in the news in the last few days.

Anyone have thoughts?
26
Please expand on this topic.
Feeding the combustion requires large flows at high pressures. Historically, that has been done by parasitically powered pumps. If electrics can do the job more efficiently, that would be a real advance. Imho, the topic merits a thorough discussion.
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Advanced Concepts / Re: Spinlaunch on the Moon
« Last post by lamontagne on Today at 12:24 am »
All prettyed up.
28
Turbo pumps scale quite well. Clearance on a 4" disk has to be almost scraping the walls while 16" disk with the same clearance by scale has large margins. Part of the issues that people are having is either going for the super high performance, or trying to learn by doing. An experienced pump company going for fairly modest performance should be able to beat the electric in thrust/weight. A modest closed cycle (staged combustion or expander) should be able to beat the electric as well.
29
Blue Origin / Re: New Glenn 3-Core Version
« Last post by FLHerne on 04/21/2024 11:33 pm »
"There's three rockets. You glue them together. How hard is that? Well, according to my team, it's really hard." -- Gwynne Shotwell
30
And in the not-SpaceX lots department, RGV's latest flyover shows that the lot in contention next to the factory is getting some work done on it/in it.  Drainage line being hooked up, tractor doing some grading, the fence is gone.

Have they taken possession or are they about to?  Don't know, but the lot isn't sitting there untouched anymore.

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