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Joined 1 year ago
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Cake day: July 6th, 2023

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  • zigmus64@lemmy.worldtoWikipedia@lemmy.worldCobra maneuver
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    18 days ago

    Aircraft stability and control is a fascinating field.

    Their maneuverability is owed to the fact that they’re somewhat unstable to begin with. It’s been literal decades since I had the class, but a good way to think of the difference between a fighter jet and a commercial jet (maneuverability wise) is that a commercial jet’s stability is like rolling a small ball in a large bowl. You’ve got a lot of leeway on what you can do before the ball won’t eventually end back up in the center of the bowl. A fighter jet is the opposite… it’s like trying to balance that small ball on top of a basketball. If you place it perfectly, it will stay in place. A touch off center, it will begin to drift further off center faster and faster until it falls off completely.

    That’s why it takes so much training and physical fitness to fly fighter jets. It’s almost like they’re actively trying to kill you. And that’s not just the modern computer controlled jets like the F-35 and F-22. The older jets were like that too, but I have to imagine less so. An F-18 can’t pull a 9g turn… the F-22 can, and I also understand it can fly itself while the pilot is unconscious for a few moments after that 9g turn…








  • zigmus64@lemmy.worldtoWikipedia@lemmy.worldWankel engine
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    3 months ago

    Huh… can you explain? Did they ever do research on roller apex seals?

    Idk what you’re talking about with laser ignition, but I guess that the name is self explanatory… as in a laser pulse instead of a spark to ignite in the combustion phase….

    But the roller seals are suuuuper fucking interesting. But that would bring its own issues. Sure you’d save the sliding of the apex seal against the chamber walls, but then you’ve got to deal with some sort of roller bearing exposed to the actual combustion process. Plus lubrication is still an issue…

    Fun problem to think about!




  • I’ve known some career food service folks. Even if the money is good, I don’t think it’s something to stick with long term if you can avoid it. It’s hard to be present for a family and kids when your working hours are often when the kids are home from school. There’s little to no retirement prospects and it’s difficult to set up long term savings for such since it’s all on you (totally possible, but you’ve got to be intentional about it). Plus most restaurants don’t offer things like health insurance. Everything is in the moment with those jobs… nothing is planned for the long term. As such, it’s difficult to grow.

    Folks in food service have my respect. I always hope the best ones find a way out eventually (proprietors excluded). Or I hope they find a way up where they can grow and get access to those employment benefits at whatever restaurant they’re at…


  • The most lucrative setup I had was actually not a waiting gig but as a waiter’s assistant (WA) at a fine dining joint where I live. Amazing food. I’d been a waiter at Ruby Tuesday’s and a good buddy of mine helped me out and got me a the WA thing where he was. That’s where I got a real appreciation for good food. I made minimum wage plus a tip out every night. Main duties were to run food, fill water and tea, but the big one was flipping tables. Doesn’t sound like much, but I was running around like a chicken with my head cut off. It freed the actual wait staff to spend more time paying attention to the guests.

    Friday nights were awesome b/c I worked expo, and didn’t have opening or closing duties. Got to know the head chef well too. That place had the best mashed potatoes I’ve ever had, and this mind blowing pancetta gravy that they’d made up one night several years prior when a bunch of the BoH folks were drunk partying together. Soooo glad I got that recipe.