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Cake day: June 11th, 2023

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  • I don’t know why everybody focuses so much on the top of the wing. Relative to ambient air, the pressure above the wing is slightly reduced, but the pressure below the wing is massively increased. That massive increase is far more important than the slight reduction above.

    We know this, because simple, flat airfoils are capable of flight. Think: paper airplanes, simple balsa models, etc.

    The shape of the airfoil is not actually very important for lift. You can make a brick produce plenty enough lift to maintain its altitude, if you can provide sufficient thrust and control it’s attitude.

    The specific shape of the airfoil is primarily important for minimizing drag across a variety of speeds and angles of attack at various loadings. This is where the top surface of the wing becomes important. By maintaining the flow over the wing, drag is reduced, and controllability is maintained.



  • While Intend to agree that the time needs to accommodate school schedules, it is ludicrous to base school schedules on the latest sunrise of the year, especially since that sunrise is only that late for a few weeks of the year, and for >2 of those weeks, the kids are on winter break anyway.

    Schools can adjust their schedules on much smaller increments.

    if new York stayed on -5 in winter

    New York is on UTC-5 in winter.





  • Rivalarrival@lemmy.todaytoComic Strips@lemmy.worldBack on Standard Time
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    11 days ago

    Let’s stop using the terms “DST” and “standard time”. They really confuse the issue. The contiguous US uses UTC-4 (EDT) , UTC-5 (EST/CDT) UTC-6 (CST/MDT), UTC-7 (MST/PDT) and UTC-8 (PST) time zones. We aren’t all going to be using the same UTC offset for permanent time. We are all going to be adopting the UTC offset that makes sense for our region.

    New England and Michigan are currently in the same time zone, which switches between UTC-4 and UTC-5. Year-round UTC-5 puts dawn before 4am in New York City during the summer. New England should absolutely not be on UTC-5 in the summer. They should be on UTC-4. On permanent UTC-4, New York dawns will always be between 5 and 8 AM.

    Year-round UTC-4 puts dawn at 9am in Detroit during the winter. Detroit should absolutely not be in UTC-4 in the winter. On permanent UTC-5, Detroit dawns will always be between 5 and 8 AM.

    New York should be on permanent UTC-4. Detroit should be on permanent UTC-5.