Plastics under load have a lower Tg.
Isn't Tg a poorly defined metric? It seems like thermoplastics will lose their strength as temperature goes up and there's no abrupt transition where there's a near step-change in behavior
Readit Newshatsunearu commented on A Cozy Mk IV light aircraft crashed after 3D-printed part was weakened by heat bbc.com/news/articles/c1w... · Posted by u/toss1
At a glance, that looks like worse than merely the negligence of using a new technology.
The whole point of 3D printing is that the material is moldable when hot but rigid when it cools. And people really should be aware that engines get hot.
Apparently they thought it's ok because the published glass transition temp is higher than the epoxy used for fiberglass construction
Is this a Part 103 Ultralight?
Also it's insane that they used a bolted joint with plastics on a critical place, the plastic will creep under the clamp load and will lose clamp force.
hatsunearu commented on IRS halts Direct File and points to other free services wsj.com/politics/policy/i... · Posted by u/anigbrowl
> To file returns for free through private companies
Anyone else thinks that sounds hopelessly optimistic?
I used cashapp's free tax software and it was pretty good. Similar quality to TurboTax but free. I had regular W-2 income, a whole lot of 1040 forms, and an S-1 form from some ETFs.
Not necessarily disagreeing, but I'm not sure automotive HUD technically qualifies as one.
Airplane HUDs occupy center of the vision, literally showing where you're going. Car HUDs don't, and instead stay out of sight, as it's illegal to do in cars what they do in planes. That makes car HUDs just heads down display that happens to be transparent.
Well for cars, you do need to be on the active lookout for pedestrians, other cars, etc, but for planes generally you are mostly looking at instruments. You only really look outside if you expect something is coming, and the HUD isn't really a distraction there.
hatsunearu commented on Nintendo Switch 2 Dock USB-C Compatibility lttlabs.com/blog/2025/08/... · Posted by u/croes
Back in COVID times, when I had all the time in the world, my Switch got bricked after I charged it using my laptop charger. Nintendo refused to honor its warranty, citing some mumbo jumbo about proprietary USB-C hardware. Fortunately, we have pretty good consumer protection laws here in Australia By the end of an entire two month saga, they sent me a brand new Switch.
I always did think it was odd that a USB-C cable that wasnt Nintendo could break my Switch.
USB-C was really really really rough in the early years. The switch 1 was one of the first products to come out with USB-C IIRC.
hatsunearu commented on Xfinity using WiFi signals in your house to detect motion xfinity.com/support/artic... · Posted by u/bearsyankees
I wonder what they do with them when they’re returned. Ship em off in pallets to e waste buyers in China I would guess.
I think they get refurbished and sent back to other customers.
Entropic gravity is like the "brazil nut effect" [0] [1]. The idea is that if you shake a glass full of different sized nuts, the large ones will rise to the top.
From what I understand, this is because larger objects have more mass, moving slower when shaked, so as the larger (brazil nuts) don't move as much relative to the smaller ones (peanuts), and because of gravity, there's a cavity left under the brazil nut which gets filled in with peanuts.
For entropic gravity, the idea is that there's a base density of something (particles? sub-atomic particles?) hitting objects in random ways from all directions. When two large massive objects get near each other, their middle region will have lower density thus being attracted to each other from particles hit with less frequency from the lower density region. They sort of cast a "shadow".
I'm no physicist but last time I looked into it there were assumptions about the density of whatever particle was "hitting" larger massive objects and that density was hard to justify. Would love to hear about someone more knowledgeable than myself that can correct or enlighten me.
As an aside, the brazil nut effect is a very real effect. To get the raisins, you shake the raisin bran. To get gifts left from your cat, you shake the kitty litter. It works surprisingly well.
My interpretation of entropy is that if you have X states that are equally probable, but not all states are distinct from each other in some sense, then the next state will likely be one where the states satisfying that condition is most numerous.
For example, if you flip N coins, there are 2^N states available once the flip is done. Each outcome has an 1/2^N probability of outcome. There's only one state where all of the states show all heads. While there's only one state where coins numbers 1-N/2 are heads, and N/2-N are tails, so that particular outcome is 1/2^N, if all we care is the macroscopic behavior of "how many heads did we get"--we'll see that we got "roughly" N/2 heads especially as N gets larger.
Entropy is simply saying there's a tendency towards these macroscopically likely groups of states.
hatsunearu commented on Prohibition and ice cream in the US Navy oldsaltblog.com/2025/05/h... · Posted by u/speckx
Two beers per head are still authorized after 45 days underway when there's no port call scheduled in the next two weeks. But they still make a bureaucratic circus out of it to avoid hoarding and trading. They crack the beers before they give them to you so you can't stash them.
is it 2 beers per day?
hatsunearu commented on Chomsky on what ChatGPT is good for (2023) chomsky.info/20230503-2/... · Posted by u/mef
> The world’s preeminent linguist Noam Chomsky, and one of the most esteemed public intellectuals of all time, whose intellectual stature has been compared to that of Galileo, Newton, and Descartes, tackles these nagging questions in the interview that follows.
By whom?
That is unbelievable that someone could glaze someone this hard