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lutorm

HN member
Joined
Mon, Feb 25, 2008, 6:06 AM UTC
HN karma
8,456
Public activity
3,443 items

About lutorm

Ex-astrophysicist, ex-rocket engineer, now working on a private project.

Recent public activity

  1. comment
    Comment #43100845

    So, as I understand it, the wing is broken down in sections, each of which will use some tabulated lift and drag for that airfoil at the current velocity vector and dynamic pressur…

  2. comment
    Comment #43035327

    I'm not understanding the situation. When I had RSUs as an employee, those grants were voided at separation. I only got to keep the RSUs that had vested before separation (which we…

  3. comment
    Comment #42981299

    Did European hard drives run at 3000 rpm then?

  4. comment
    Comment #42981293

    I find it most annoying when moving your eyes. Anyone will notice the flicker if their eyes aren't stationary since then each "flick" will end up on a different part of the retina.…

  5. comment
    Comment #42931066

    The US supreme court has not, at least so far, endowed computers with personhood...

  6. comment
    Comment #42931047

    ... simply reprogramming the computer ... So who makes the decision to do that? I think most people are missing the point about accountability and thinks, in typical American fashi…

  7. comment
    Comment #42862710

    Given that they were only authorized to fly in the "Bell X-1 supersonic corridor", I'd wager that sonic booms are fairly commonplace there. I doubt there are any residents around. …

  8. comment
    Comment #42820664

    I really don't care for controlling lights or whatever, but I find it very nice as a common place to monitor all the different things we have in the home: heat pump, evse, humidity…

  9. comment
    Comment #42820408

    Even with a car's higher rolling resistance, most of the drag at cruising speed is aerodynamic, though. But a commuter train, by definition, starts and stops a lot so it makes sens…

  10. comment
    Comment #42695187

    Although "Top-level vdevs can only be removed if the primary pool storage does not contain a top-level raidz vdev, all top-level vdevs have the same sector size, and the keys for a…

  11. comment
    Comment #42695177

    Apart from just peace of mind from bitrot, I use it for the snapshotting capability which makes it super easy to do backups. You can snapshot and send the snapshots to other storag…

  12. comment
    Comment #42681100

    Given their development pace, they really must succeed if they want their "slowly and carefully" model to be competitive.

  13. comment
    Comment #42677018

    "Dark matter" is just a description that refers to matter which interacts gravitationally but not, or at least very weakly, in other ways. It doesn't imply anything about the natur…

  14. comment
    Comment #42608609

    Well, it's not like people pulled it out of thin air. Both inflation and the lambda-CDM models are solutions to the GR equations, so in that sense it's perfectly justifiable to see…

  15. comment
    Comment #42478975

    But it seems that the principal objection to these counts is that birds don't necessarily die on impact but may travel quite far before succumbing to their injuries, so the counts …

  16. comment
    Comment #42443618

    This approach seemed super interesting and we attempted to use it for modeling a fairly complicated fluid system (pipes, valves, tanks, etc). However, in the end the equations that…

  17. comment
    Comment #42234522

    IIRC the current Starlink beams are of order 10 miles on the ground. So much narrower than you guess.

  18. comment
    Comment #42234427

    Swarm wasn't a competitor to SpaceX at the time, Swarm and Starlink wasn't aiming at the same market at all. And they didn't exactly kill Swarm. They launched Swarm satellites for …

  19. comment
    Comment #42219774

    It's worth noting that cash held in a Fidelity brokerage account is handled the same way, by being "swept" into a bank account held by Fidelity at an actual bank so Fidelity can cl…

  20. comment
    Comment #42192387

    The booster is already strong enough to support itself in compression, because that's what it does during ascent and the landing burn. The entire bottom structure of a rocket (the …

  21. comment
    Comment #42192360

    That will have to happen through in-situ resource utilization. aka making the fuel on Mars.

  22. comment
    Comment #42192330

    Every time you throw a rock, it ends up on a trajectory that "would have orbited if the earth was a point mass". That's just not a very useful definition of "being in orbit".

  23. comment
    Comment #42186302

    My experience (being fully remote for over a decade) is that it's extremely distracting to have all discussions public. It creates a lot of noise and it's very hard for people to n…

  24. comment
    Comment #42173580

    At least on our PHEV, when you read out the battery module state with an OBDII reader, you get to know not only the current estimated capacity but also how much time it's spent at …

  25. comment
    Comment #42061735

    I mean, what choice, besides averaging, would make sense? Completely disregarding one pilots input seems worse, and averaging is what happens in a mechanically connected system. Th…