mikegarrison
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Posts posted by mikegarrison
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On 4/24/2024 at 10:44 PM, kerbiloid said:
Afair, Columbus previously had spent some time in Iceland
Columbus never spent any time in Iceland.
He had no idea that the Americas were there at all, even when he found the islands that we now call Cuba and Hispaniola. He thought he had found islands off the coast of China.
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2 hours ago, SunlitZelkova said:
Humans have been around for 300,000.
Of course, when homo sapiens emerged from the other (now gone) hominids is not 100% clear.
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1 hour ago, SunlitZelkova said:
People worked together to slay a mammoth and then shared the results.
Mostly people hunted deer and rabbits, not mammoth.
Anyway, studies of hunter-gatherer cultures have tended to show that hunting -- which brings in a large amount of quick-to-spoil meat and tends to be kind of random -- usually results in the meat being shared. It kind of works like a meat food bank, except that instead of storing the meat in a freezer, they store the meat in the memories of the other hunters, who then later share their own good fortune. Hunting camps still work like this today. It's quite common when you go hunting that if someone in your party gets an animal, everyone stops hunting and helps haul the meat back to camp. And then everyone splits the meat equally.
But gathering -- which tends to simply be a matter of putting in the work to get a fixed amount of results -- tends to not be shared, and instead the one who gathers the most gets the most.
On Mars, undoubtedly everyone would work together communally, at first, and all eat from the same food supply.
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I tend to doubt that many human societies larger than, say, nuclear families have truly not had any concept of personal ownership. People spend time and calories making tools and gathering food, and it is unlikely they would just have no concept that the results of their labor belong to them.
A small Mars colony may well start out with most things just being community property, but I would bet that once it got to be enough, people would start claiming their own spaces and possessions.
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2 hours ago, darthgently said:
Serious question, what are the easy-to-profit-from ways?
Things with lower margins but near guaranteed markets. Long game. Food, shelter, (alcohol, tobacco, and firearms?)
Selling addictive substances tends to be profitable. Ask Starbucks about that.
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4 minutes ago, PakledHostage said:
Richard Branson's quip about how to become a millionaire ("Simple: first become a billionaire and then start an airline") springs to mind about airlines...
AKA the "small fortune" joke.
How do you make a small fortune running a winery? Start with a large fortune.
(For "running a winery", you can also insert any other notoriously hard-to-profit-from task.)
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There is a whole class of companies that do not "exist to make money". These are called "non-profit companies".
(Yes, OK, I do know that a non-profit can make a profit. The important part is they do not return any profits to their owners/members/shareholders. But the point is that companies exist for many reasons, and making a profit is not always one of them.)
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10 hours ago, magnemoe said:
Yes jet engines run lean on 20% oxygen in the atmosphere. Rocket engines uses lox and fuel, mixed together, great care has to be taken to not melt the chamber.
Jet engines could easily melt their own combustion chamber, if not for the engineering to make sure that doesn't happen. They are not as different as you seem to think. But the typical jet engine combustor is much more complicated than a rocket engine combustor, because it has constraints that a rocket engine combustor doesn't have. Emissions control, for example. There are no emissions rules for rocket engines.
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5 hours ago, tater said:
SLS was required by the law that created it to be operational (not a test flight!) by the end of 2016. "GOAL FOR OPERATIONAL CAPABILITY. It shall be the goal to achieve full operational capability for the transportation vehicle developed pursuant to this subsection by not later than December 31, 2016."
ICPS was only supposed to fly exactly once, they have neither the EUS, nor the MLP to fly with EUS built.
They don't have spacesuits for EVA.
Assuming they can fly Artemis III by 2026, they will only be 10 years late!
"goal".
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You see these
uglygloriously beautiful sketches? I made this in about three minutes in Powerpoint for one of my working papers in ICAO CAEP Working Group 3, and somehow they ended up in the final draft, never getting replaced by something nicer.
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https://www.ecfr.gov/current/title-14/chapter-I/subchapter-C/part-38
I worked on this rule for six years almost full-time, and it has finally become part of US code. (It's been law in other places for several years now.)
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Turbine engines are usually limited by the combustor, first stage turbine nozzle, and first stage turbine blades. In other words, the hottest part of the engine.
All metals lose their durability as they approach their temperature limits. If you keep the temps low enough compared to the temperature resistance of the metal, the hot section can last for an almost indefinite amount of time.
But to get more thrust and fuel efficiency, you want that T4 to be as hot as you can stand for it to be.
So it's a tradeoff. Usually engines are designed for a certain number of hours on-wing, and then they push the temperatures and pressures up and the cooling airflow down until they hit that target. They could get them to last longer, but it would cost in performance and efficiency. They could get them to have higher performance and efficiency, but they wouldn't last as long.
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1 hour ago, magnemoe said:
Now one weird effect in KSP is that if you shoot an rocket straight up say 10 km it will come down west of launch point.
There is nothing weird about that.
The rocket starts with a Vhorizontal = to the horizontal speed on the surface of Kerbin. As it goes up (neglecting air friction), it keep that same Vh. But to stay above the same point it started at, it would actually need a bigger Vh, because the radius above the center of the planet is bigger the higher the rocket goes. So it drifts east, but not as fast as the surface is going east. Thus, relative to the surface, it falls behind by drifting west.
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2 hours ago, Ultimate Steve said:
and posits that there aren't many other reasons why you would prepare a proposal and not submit it
Having done this before, many times, there are many reasons why someone might prepare a proposal like this and not submit it. Number 1 is that your own management, who asked for the proposal in the first place, changes their mind either once they see it or just because time has passed and things have changed.
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On 4/13/2024 at 2:42 PM, PakledHostage said:
Off topic, but an aircraft that's over its maximum landing weight can still land. It just needs an overweight landing structural inspection done before it can fly again.
Yup. Mostly operators want to avoid that, so they burn off fuel.
A potentially more difficult problem is if the current fuel load is not within the cg limits for landing. Airplanes can (and do) sometimes fly in cruise with cgs that are not allowed for landing.
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2 hours ago, tater said:
Robots are better for all the science, but it's not the same as people. I was at a conference at Caltech years ago (Voyager Neptune encounter, actually) and in a discussion someone asked what humans could do that probes couldn't, and a guy yelled, "Have children!"
No human (or even animal) children have ever been born off Earth, so it's not entirely certain that humans could have children on Mars or in a space station.
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Seattle's Museum Of Flight has a Yuri's Night party every year. This year the radio station I listen to in the car (C89, a Seattle high school radio station) was heavily advertising that the party would include wearable vibration technology for deaf and hard of hearing people to enjoy dancing to the music.
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I find I never watch these anymore. Partly for the same reasons networks stopped live-covering shuttle launches by the time that one exploded. And partly because they stopped putting them on YouTube. I know, I know, Elon owns "X" and wants to drive traffic there, but if he actually wants people to watch the broadcasts.....
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11 minutes ago, tater said:
This is a pretty precise statement of the problem, and why historical comparisons are not useful.
The Life and Strange Surprizing Adventures of Robinson Crusoe, of York, Mariner: Who lived Eight and Twenty Years, all alone in an un-inhabited Island on the Coast of America, near the Mouth of the Great River of Oroonoque; Having been cast on Shore by Shipwreck, wherein all the Men perished but himself. With An Account how he was at last as strangely deliver'd by Pyrates. Written by Himself. would have been a book whose text was shorter than its title if he couldn't even breathe the air on his island.
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I didn't realize someone had restarted this discussion.
The romantic stories always pretty much come down to assuming that people go to these remote places because they want to leave society. They are trailblazers and explorers and individualists by nature, and that's the appeal for them. But the problem is that Mars is too hostile for individuals. You need the support of a society to live there.
Which leaves the other main reason, resource exploitation. Except, we don't actually know of or even expect any resources that justify the difficulty in going to Mars, harvesting them, and coming back.
So it kind of looks pretty bleak right now. More like a "scientific outpost" situation than a "colonization" situation.
Or maybe, there is a third option, which actually could be the most realistic one. Some super-rich people fund it just because they want to and they have nothing else to spend all their money on.
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I imagine all the rockets sitting around and pounding a few back, and suddenly the Delta IV Heavy stands up. "Here, hold my beer. I'm gonna set myself on fire! It'll be great!"
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37 minutes ago, CollectingSP said:
DIVH is still cool regardless.
What's not to love about a rocket that SETS ITSELF ON FIRE just before it launches?
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4 hours ago, Space_Coyote said:
And thus the end of the era.. RIP Delta Series of Rockets.. You 've done your job.. Time to retire... (Just don't destroy the BP's will ya? we might need them again one day..)
Blueprints don't matter as much as tooling, and I'm fairly sure the tooling is all gone.
A City On Mars
in Science & Spaceflight
Posted
Believe what you want, I guess, but Columbus was not aware of the correct radius of the Earth, even though it had been pretty accurately calculated more than 1000 years before him. That's why he had so much trouble finding backers who were willing to fund his expedition -- most everyone else was aware that China was much farther away than Columbus believed it to be.