Silavite

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  1. I feel like that's true most of the time, but not always. For example, I think Tim did a good job in this interview in getting Elon to talk about Methalox vs Kerolox and why SpaceX declined to use an aerospike engine (related to combustion efficiency in aerospikes vs bell-nozzles).
  2. @tater Ignore my previous post. Just realized that the precession will occur about the equator, not about the ecliptic. Thus the orbit will become misaligned from the terminator as the Earth revolves around the sun.
  3. You could get the same, constant sunlight from a sun-synchronous orbit with an inclination of 113.5 degrees (90 deg + Earth's equatorial tilt of 23.5 deg w.r.t. the ecliptic) and altitude of 3127 km. The path of the orbit follows the Earth's terminator, so the spacecraft would be under constant illumination. The downside is that this orbit is smack inside the inner Van Allen belt. That said, if you're looking to test the durability of a space system, this could be viewed as a positive. Ignore this
  4. About the launch vehicle discussion; https://arstechnica.com/science/2020/05/nasa-is-counting-on-a-lot-of-unproven-rockets-for-its-artemis-plan/
  5. The pedant in me feels obligated to point out that the inverted gull has an added bonus of reducing interference drag for a low mounted wing. That said, this was indeed likely nothing more than a bonus as opposed to the more pertinent consideration of a 13' propeller chopping through carrier decks.
  6. I was thinking that roll could be handled purely by the RCS (and thrust vectoring when applicable). There isn't a need for rapid rolling, and I don't see where large external torques in the roll axis would arise.
  7. I had the idea of using a single set of control surfaces which do not rotate, but only translate. Here's a crude MS Paint approximation: Benefits: Fewer control surfaces required in total could help to reduce mass and potential points of failure. The fact that these surfaces move perpendicular to the velocity vector (in a skydiver configuration) rather than directly against it means that less powerful and thus less massive actuators would be required. Drawbacks: A big slot on the side of the spacecraft for the necessary translation would likely be... undesirable during reentry. Even if the actuators could be smaller, they're delivering power to a moving surface. Thus, the actuator would have to move with the control surfaces, or some kind of system would be needed to deliver the force. (Or maybe you could try using some kind of linear motor.) Comments? I'm sure there are more flaws which I haven't thought of yet.
  8. Was this a gamma ray burst? The coverage I've seen thus far just seems to be talking about an, "explosion," without much further detail about the exact phenomena.
  9. Apparently Tesla is looking to try and substitute Ni-Co-Al vehicle batteries with Li-Fe-P. Tesla in talks to use CATL's cobalt-free batteries in China-made cars
  10. According to Shotwell SpaceX is likely to spin-off Starlink. (In a similar manner to how they spin-off Starlink satellites from the F9's upper stage ) https://arstechnica.com/information-technology/2020/02/spacex-plans-likely-spinoff-and-ipo-for-starlink-broadband-division/
  11. Some takeaways from the post-flight press conference. Hardware for DM-2 will probably be ready sometime in February, but the flight itself won't happen until a bit later due to necessary checks/scheduling. This test doesn't really have applications outside of commercial crew. Whether DM-2 will be short duration or long duration is TBD. NASA is still planning to purchase another Soyuz seat.
  12. A bit off-topic, but I cannot resist sharing this gem
  13. How would the heliosphere and stellar bow shock affect our observations of objects outside the solar system, if at all?