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mikegarrison

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Everything posted by mikegarrison

  1. Sure, SpaceX are not the only people doing this. Nor were they the first. I mean, Buzz and Neil landed on the moon, right? They sure didn't use parachutes or wings. But it's pretty clear SpaceX are currently the leaders in this, with a vast base of experience. (I would guess most people realize I'm not a huge SpaceX fan in particular, but I don't need to be a fanboy to see this obvious fact.)
  2. Oh, I think it would be very difficult to argue this. They point-blank are the leader in this right now.
  3. "Rule of cool" We use explosives to blow rocks apart on Earth, but that's because all the little rocks end up falling into a pile where they can be scooped up. That would not work in what is nearly a zero-g environment.
  4. I don't think you understand mining at all. The point of mining is to concentrate the materials you are interested in. Scattering them into little pieces all over space is not the way to go mining.
  5. The key to all this is that high voltages are needed to efficiently transfer power, and AC transformers made high voltages very easy to deal with. Only recently have people invented solid-state systems that can efficiently and mostly reliably step up or step down DC voltages. These are still more expensive than transformers, so they are mainly used as bridges between AC systems, to avoid the need to synchronize the different AC grids. They also work much better for underwater power cables. Like any major piece of infrastructure, once the grid is established it's hard to change i
  6. Because I'm working from home, I've been skipping Dres a lot these days.
  7. OK, like I said, you do you. However, line between "mods" and "user-created patches to fix bugs" is not really a line at all. More like a Venn diagram. So if there is a mod that fixes a bug in the base game, it makes sense to me to install it even if someone "doesn't do mods". I guess it made sense to you too.
  8. Well, you do you. But why not? Mods are basically what makes KSP what it is. This a 10-yr-old game that remains fairly vibrant and relevant almost entirely because people continue making mods for it.
  9. Red was "support" -- engineering, security, communications, etc. Blue was science and medical. Yellow/Green (apparently the shirts were actually green but appeared yellow on TV) were for captain, helmsman, etc. When Kirk wore his dress uniform it was green, but apparently it was actually the same color as the regular uniform in normal lighting. But due to the different fabrics, the regular uniforms appeared gold-colored on TV while the dress uniform appeared green.
  10. I would say that maybe the cables should have been designed so that they can't be connected to the wrong sides, but we've seen often enough that even such foolproof engineering can be defeated by determined fools.
  11. Yeah, solids have low enough ISP that more stages make sense. Also, since it is hard to control their thrust, you would have issues of too much acceleration if you had a solid stage that burned too long. But still, it's an issue. However, I have to admit that the solid stages seemed to not be the problem here. It was the liquid stage that failed.
  12. Well to be fair, it would not have had any implications for spacecraft operations back when he proposed it.
  13. 4th stage failed. This is perhaps an example of why fewer stages gives fewer chances for errors to crop up.
  14. You can't always trust everything you hear on You Tube. Tesla worked for Edison at one point, but according to his autobiography, he quit when "The Manager" (not clear if it was Edison himself, but it doesn't seem like it was) promised him $50,000 to solve some problem with the power generation plants. Tesla did solve it, and then was told that the offer of $50,000 had been a joke. But there did not seem to be much personal animosity between Tesla and Edison. The so-called "war of the currents" was actually fought between Edison and Westinghouse, not Edison and Tesla. Aroun
  15. Hmm. I didn't realize this was happening, until apparently it threatened to stop happening due to some heaters.
  16. If you have ever played Civ VI, it is very clear that the "launch earth satellite" rocket is an Atlas V. I've gotta say, SpaceX is so much better with their PR production values. Watching a SpaceX launch stream versus a ULA launch stream is like watching a Hollywood movie versus a college school project video.
  17. Obviously if something happened to ground Soyuz, then Russia would face the same issues the US faced after the retirement of the shuttle. Either buy seats on a US spaceship or don't fly. But no, politically Russia is *not* going to buy seats from the US (or a US company). And certainly the US would be unlikely to give them away for free, after all the years that Russia made the US pay for seats. As are we all.
  18. I find this post confusing. If the PCR test amplifies the signal as you repeat the cycles, it seems like this means high cycle tests should: have fewer false negatives have more false positives, unless it is impossible to amplify a false positive signal Lower cycle tests would therefore increase the false negatives but decrease the false positives, wouldn't they?
  19. pV=nRT So yeah, increasing pressure increases the temperature of a gas in a confined volume. But this is the ideal GAS law. It does not apply to liquids. Boiling happens when the vapor pressure of a liquid is greater than the pressure of the fluid that is resisting it. So pressurized liquids are less likely to boil. (Essentially, it becomes hard for the vapor to make room for itself.)
  20. I missed this before, but they can control how hot the flame gets if they want to, by controlling the oxygen/methane ratio. That being said, gas turbine engines routinely have temperatures in their primary combustion zone that are hot enough to destroy their combustors in minutes. But they last for many thousands of hours because of active and passive cooling.
  21. (shrug) Good luck to them, but this has even more issues than maglev trains, and those have been "the future" for about 100 years now. I guess we'll see.
  22. Yes, I was trying not to get into the time dimension, but this is also true. https://en.wikipedia.org/wiki/Starting_vortex The idea is that in potential flow (that is to say, a flow that can be defined with the velocity as the gradient of a scalar "velocity potential"), net vorticity must always be zero. So whenever the lift changes, the circulation changes, so the vorticity around the wing changes, so an equal and opposite amount of vorticity must be shed. This is not shed from the tip of the wing, it is shed from the trailing edge. It's linked to the Kutta condition. This is true with s
  23. There is vorticity, but it's bound to the wing. It never sheds because the wing is infinite. Of course, since such a thing only exists in theory, it's not a real-world concept.
  24. I don't really know. I'm much more familiar with the design requirements of civil airliners.
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