Tech Tuesday 04/09/19 – Back To The Grind Edition.


Oscar Gordon

A Navy Turbine Tech who learned to spin wrenches on old cars, Oscar has since been trained as an Engineer & Software Developer & now writes tools for other engineers. When not in his shop or at work, he can be found spending time with his family, gardening, hiking, kayaking, gaming, or whatever strikes his fancy & fits in the budget.

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12 Responses

  1. Avatar Marchmaine says:

    [TT08] Pictures look cool. I have one prediction and one question:

    Prediction: This will be developed into a super-luxury hotel without any of the ecological concerns… it will be costly, inefficient, a power and resource hog and it will be magnificent.

    Question: How does it survive extreme oceanic waves/storms? Especially tethered in proximity? I barely grasp how giant oil platforms can ride out storms… how would you manage a city of hundreds of platforms that need to be in roughly the same place after the storm as before? Maybe this is the trivially easy part of the engineering challenge, but show me the pictures of riding out the 30 foot swell.Report

    • Avatar Oscar Gordon in reply to Marchmaine says:

      To your question: Location, location, location!

      Oil rigs ride out storms by being anchored to the bottom and then elevated high enough that your normal storm swell won’t touch the main platform.

      A community like this would require sea walls set further out to break the incoming waves up. The trick isn’t really stopping the waves (since you won’t), but altering them by trading amplitude for wavelength. The city won’t survive 30′ tall waves that are here and gone in a minute, but it could survive waves that are only 5′ tall and slowly roll through.Report

    • Avatar George Turner in reply to Marchmaine says:

      It turns out that North Sea oil platforms have to face waves up to 100 feet high. Until recently such waves were thought to be physically impossible, just crazy sea stories, but it turns out they’re rather common under certain conditions.

      Youtube has a couple good documentaries on “rogue waves” that are worth watching.Report

  2. Avatar Michael Cain says:

    TT05: Bad gums, not bad teeth. Two different types of bacteria are responsible for tooth decay and for gingivitis. There’s a statistical link between gum disease and heart disease/strokes as well. The gingivitis bacteria have been found in coronary artery plaques, although no one has tied down whether there’s a causal link there.Report

  3. Avatar Pinky says:

    TT12: I believe it was Joseph Campbell who, in a fit of anti-Semitism, said that “the moon would be a good place for the Jews”.Report

    • Avatar Maribou in reply to Pinky says:

      Gosh it would be nice if we could get through a week around here without someone wanting to repeat some piece of anti-Semitism.

      (Pinky, I don’t at all assume you are prejudiced against Jewish people, in fact I assume you aren’t, and I get the joke you were making. In fact it’s kind of an “in yer eye, Joseph Campbell!” joke, ennit? But y’all don’t know how often people who aren’t Jewish just happen to want to talk about this stuff on here – most of which “discussing” is quite transparently awful and gets deleted or banned or doesn’t get through the filters – and I’m so tired of it.

      And if I’m this tired of it, I can only imagine how tired of it our Jewish cmmenters and writers are.)Report

  4. Avatar George Turner says:

    TT15: You can certainly build a lightweight wing out of lightweight triangular struts, but aeroelasticity is a harsh teacher.

    One somewhat related idea is to take a basic thin rib as a structural component, and then line the top and bottom with servos and tiny jack screws that run to the true upper and lower aluminum or composite surface, controlling the airfoil shape as a spline. It might not be workable for a flight vehicle, but should certainly be an easy way to run a whole lot of airfoil tests in a wind tunnel.Report

  5. Avatar George Turner says:

    This is interesting.

    Science Daily article on a two-year autism treatment study

    At the start of the study, 83% of participants were rated as “severe” autism. At the end of the study, only 17% were “severe,” 39% were “mild/moderate,” and 44% were below the cut-off for mild ASD.

    New wonder drug? Nope. Poo transfer, on the theory that gut microbes are the root of the problem.Report