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About mikegarrison

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    IRL Aero Engineer

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  1. LOL. This whole thread is just "wouldn't it be great if we could make aerospace hardware lighter?!" As if maybe the people designing it weren't already trying to do that? As for "triple core" -- SpaceX already learned the lesson that you can't just slap three first stages together. It's not as easy IRL as it is in KSP.
  2. That's not a source. I believe I asked you to provide a source for your claim.
  3. What's your source for this? As much as people here like to complain about them, NASA isn't totally stupid. If the SRBs were genuinely more expensive to recover and reuse, why did they keep recovering and reusing them?
  4. The Air Force is big into weather. I knew a guy who was a Special Operations Weatherman. Part of his job was (potentially) to infiltrate behind enemy lines and get on-the-ground weather data for strike forces and special ops.
  5. Exactly. I mean, what if there is an issue with SpaceX five years from now? The whole idea was to have some redundancy, precisely so that if one of the programs went through some trouble, the other would still be available.
  6. I need one of those for my mouth. I can never wait for the pizza to cool down before biting that first slice.
  7. With beamed power you can (in theory). Consider the design in Robert Forward's Rocheworld aka The Flight Of The Dragonfly. The ship is propelled by a fixed laser beam aimed at a reflective sail. When it is time to decelerate, the sail splits in two. A large outer ring catches the beamed light and reflects it back to a smaller inner ring, thus providing the beamed power in the opposite direction. (Of course, this will accelerate the large outer ring, and the ever-increasing distance between it and the ship would be a potential problem.) It should be obvious that this is a one-way design. The inverse square law does apply to lasers, so at large distances you need quite a big sail in order to get a decent fraction of the beamed power.
  8. The point of this test was to see how the parachutes would respond to low dynamic pressure situations. (Also, they deliberately tested a two-parachute landing, despite [cough] accidentally already testing that [cough]).
  9. Metal is useful stuff. All sorts of shapes can be made from cold-forging, as long as the specific metal being used isn't too brittle. See this amusingly long list of the many different names for cold-working metal: https://en.wikipedia.org/wiki/Cold_working#Processes
  10. I didn't say that. It's specifically the "4x8 full-sized bed" thing I was talking about. Consider my dad. He's owned trucks for about 40 years. But he's always got *stuff* in the back of his truck. Tools, chainsaws, dog kennels, fuel cans ... sometimes an elk if the hunting prospered for him. If he wants to haul plywood (or firewood), that's why he's got a trailer. And that trailer (that he built himself) has lasted for the entire 40 years. With some maintenance, a utility trailer is much more durable than a truck anyway. In fact, if he's going to get a Christmas tree, he'll probably just bring the trailer for that, too.
  11. I have never understood the obsession with "4x8 sheets of plywood". Just how often do people need to carry them, anyway? It seems like a really niche circumstance that someone would: need to carry them often enough that paying for delivery is less cost-effective than having a light-duty truck not need to carry them so often as to justify a heavy-duty truck like a flatbed
  12. All "permanent" magnets tend to change their magnetism when they get heated. It's all got to do with crystal "grains" and how they align themselves. (In fact, that's how permanent magnets are made -- the magnetic material is heated up until the grains become flexible, then they are subjected to a strong magnetic field that lines them all up in the same direction.) It's also why cold working influences magnetic properties. Cold working also changes how grains are aligned, which is why it results in effects like "work hardening" that makes a material both stronger but also more brittle.
  13. I don't think that is a meaningful concept. The event horizon has a radius (Schwarzschild radius). I don't think the black hole itself has a radius. It just has mass.
  14. What do you mean by a "singularity", anyway? We know stars that are large enough collapse into black holes. These are too large to "evaporate" by Hawking radiation in any reasonable amount of time. (Extremely small black holes would probably evaporate before they grew.) The more massive the black hole, the less strong the tidal forces would be. A really massive black hole should have an event horizon big enough that tidal forces wouldn't rip up a person before they fell through it. As I understand it, an object falling into a black hole appears, from the outside, to slow down in proportion to how close it gets to the event horizon, and so it can never be seen to enter it. But from the point of view of the object itself, the event horizon of a supermassive black hole would basically be more of a non-event horizon. You simply would just head on in.
  15. I am pretty certain this is the case. My uncle worked on the railroad for many years. I believe he was a brakeman.