Aerospace engineer working to make aircraft greener & safer.
He/him. 🇺🇲
[TBD - What else goes in a profile?]
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https://commons.m.wikimedia.org/wiki/File:Game\_of\_life\_animated\_glider\_2.gif
Cover is my own photo.
I rented a Bolt EV from Hertz once. The car was fine, but the charging stations in the area were mostly broken, or they required downloading an app and giving personal information to charge.
I got the feeling the charging networks are all about collecting government incentives and the sale of private information from subscribers, and not at all about service.
My new preferred rental car is no rental car at all.
Sorry, I tried! It took me several tries to find a way to download the vid, and when I tried posting I saw this:
We are working on resolving the issues
Over the next few days, there will be a change in server infrastructure. Temporary problems with the website’s functionality may occur during this time.
Without reading the article, this smells a lot like #enshittification
I agree with all of that. My intuition is that prior to curing, the polymers are less stable and may change in unpredictable ways depending on subtleties in the storage environment and handling. After curing, the polymers are much more stable and durable.
Metals definitely are more forgiving, and we have better tools for testing, especially non-destructive testing. Whether the CF flaws are due to fatigue or workmanship, it’s easy to miss them in inspection.
I’m also curious what the sub designers saw as the advantage of CF for this application. Is light weight really all that advantageous for a submersible? Generally no one chooses CF if they are prioritizing cost.
From my limited experience with laying up carbon fiber, I know there’s the raw carbon fiber cloth and there’s liquid resin that you spread into the cloth. It’s also very common to see carbon fiber cloth that is “pre-impregnated” - the resin is already applied to the cloth. Everyone calls this “pre-preg”.
So I’ve seen a lot of folks online scratching their heads about “how can carbon expire?” or “my carbon fiber (bike/boat/etc.) is N-years old, is it expired?” but I think the most likely thing to expire is the resin. Once the resin is cured it is much more stable.
Any materials folks or structures engineers who want step in and correct me, please do.
I got SW Maps Android app to use with a RTK device and NTRIP servers for very precise positioning.
Even without the RTK, the app will record a track. Settings let you choose what distance or time interval to record points.
But it’s not the sort of thing that runs automatically in the background all the time. It’s meant for deliberate start/stop recording your position.
Recently our county sheriff put out an Amber Alert (a forced alert on all mobile devices) but the obfuscated link resolved to Twitter.
I wonder what portion of the public saw the Twitter login page and just closed the tab, never to see the details of the child abduction.