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SEJeff

11,214 karma · joined January 5, 2012

I <3 Linux.
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SEJeff··on Tesla Roadster
from an archive of the “Three dog day” Tesla blog post that’s now deleted. Took me a few to dig up, but I wanted the primary source for you.

https://archive.is/Q7FFk

“”” That was combined with upgrading the main pack contactor to use inconel (a high temperature space-grade superalloy) instead of steel, so that it remains springy under the heat of heavy current. The net result is that we can safely increase the max pack output from 1300 to 1500 Amps. What this results in is a 10% improvement in the 0 to 60 mph time to 2.8 secs and a quarter mile time of 10.9 secs. Time to 155 mph is improved even more, resulting in a 20% reduction. “””

SEJeff··on Tesla Roadster
https://news.ycombinator.com/item?id=50138131
SEJeff··on Tesla Roadster
You’re absolutely right and I clearly remembered this incorrectly. I conflated the model S actually breaking the NTHSA press that crushes cars to test rollover strength with the fact that the model s does use Inconel. My apologies. I wasn’t acting in bad faith, just remembered wrong.
SEJeff··on Tesla Roadster
They’ve wanted to shut down the s and x lines since the y and 3 were first being manufactured at scale. His timelines are always wrong but Elon has said this for years.
SEJeff··on Tesla Roadster
They shut down model x and s production to retool those Fremont lines for Optimus robots. They actually are making them btw. They’re using them in their own factories currently just like they used the Tesla semi for like two years for their own freight before selling them to the public.
SEJeff··on Tesla Roadster
Tesla’s machine vision research wing became xAI and the compute and resource were transferred over. SpaceX then bought cursor.ai, a small but goated frontier lab. They merged cursor with xAI and it’s now SpaceXAI. So each Tesla uses models trained by SpaceX AI.

The model s has always had Inconel in the frame for strength since relatively early on. But the Inconel came from SpaceX. Inconel is primarily used in aerospace applications. It made the frame of the model s so strong it broke the NTHSA machine used to test rollover strength. Look this up it is easy to verify.

SpaceX materials science has always been a big part of Tesla’s success since the very early beginning. Likewise inversely.

SEJeff··on Tesla Roadster
Teslas are some of the safest cars on the road. Even if you dislike musk (he’s not a good human), the record stands pretty solidly on their side.

When the NTHSA did the rollover test on the Tesla Model S, it broke the machine they use. It was estimated that it would take the weight of nine model S vehicles ontop of a model S for the roof to collapse. Tesla patented millimeter wave radars in the seats and got approval to install them. They now know if a large adult, small adult, child, animal, or groceries are in a seat. The airbags are reconfigured on the fly depending on what is in the seat. Consumer reports did a test and found Tesla wasn’t great in slam the brakes stopping distance, and did a report about it. Tesla confirmed and did some testing. They had a software update in less than a month to dramatically improve it to generally best in class. They have so many safety features many of which are now mandated in new vehicles that were not required when Tesla started producing vehicles.

Just look at some of the utterly insane Tesla crashes where in most cars all would he dead and folks walk away from them in the teslas. Some of the Teslas use a very special composite metal named Inconel in the frames. Look it up. Inconel is most commonly used in high performance aerospace applications like space rockets, and Tesla is the sole automotive manufacturer in the world with access to a large supply of it and know how. The Tesla model S plaid seats were designed to withstand 9Gs of lateral force, a thing no other street legal car in the world can do. Tesla asked the seat manufacturer that makes most all of the seats in the world to support this and they laughed at them. So Tesla made their own, and it’s safer than any of the other ones due to its design. Don’t trust me, verify this with google. It isn’t hard.

SEJeff··on 3rd Yandex Cloud Data Center Was Hit
Pretty much precisely what the US did during the Cold War. To do so, we had to outspend the Soviets, and by a LOT. But the world buying US treasury bonds was basically a credit card for us to finance the above things that result into the world’s strongest military.
SEJeff··on New evidence for hidden chambers beyond Tutankhamun's tomb
KREE!
SEJeff··on Growing proof that autonomous cars save lives
Yeah, it is very good, but that’s only in roughly 1100 sq miles in the US. The long tail of edge cases is exponentially harder than the rest of it. They’re improving quite quickly was my point, and if anyone stands to pull it off, I’d bet on them pulling it off first.
SEJeff··on Growing proof that autonomous cars save lives
As someone who’s owned a Tesla since 2018, and was part of the early beta program, I at least have a better understanding of the tech than most random folks who don’t actually drive one daily. Also, I’m not a fan of Elon at all.

It is easily one of the best if not the top three in the world (I’m including the Chinese companies like BYD, but we can’t get those in the US).

I can say “navigate to the closest publix”, it will back out of my garage, and then drive there the whole way hands off, find a parking spot, and park.

Tesla’s robotaxi sq mileage is roughly 1100 miles vs Waymo’s 475. This is true autonomous no safety driver in the car.

So jokes aside, Tesla is leagues ahead of everyone else sans maybe some of the state funded Chinese car brands. Having actually used the tech daily for years, it’s incredible, truly.

SEJeff··on Growing proof that autonomous cars save lives
The US is ~263x larger than the Netherlands landmass wise. It would require a loooot more trains than we have or you have.
SEJeff··on Growing proof that autonomous cars save lives
Buddy buy a Tesla, as that’s definitely gonna happen in the medium term.
SEJeff··on Bomb fishing is wreaking havoc on Indonesia's coral reefs
Care to explain for those of us unaware?
SEJeff··on Linux 7.2
Happily upvoting you for agreeing on principal with me. I shall likely join the flogging as a result.

I’m sure it will hurt my 11k internet point account.

SEJeff··on Zigbee vs. Matter over Thread:Understanding IoT Protocol Performance in Practice
Yeah that majorly sucks mate. Perhaps zwave devices just don’t work well upside down?
SEJeff··on Zigbee vs. Matter over Thread:Understanding IoT Protocol Performance in Practice
Hey mate, Z-Wave in Australia operates on the 919.8 MHz regional frequency, which is different from the US (908.4 MHz) or Europe (868.4 MHz). They have AU certified zwave kit.
SEJeff··on Zigbee vs. Matter over Thread:Understanding IoT Protocol Performance in Practice
You pay to have it tested and certified to use the trademark. This is why so much zwave kit from different vendors works perfectly where as zigbee it’s more of a crap shoot if different vendor’s gear works well together.
SEJeff··on Zigbee vs. Matter over Thread:Understanding IoT Protocol Performance in Practice
It is so proprietary in fact all of the spec is on github:

https://github.com/zwave-js/specs

SEJeff··on Zigbee vs. Matter over Thread:Understanding IoT Protocol Performance in Practice
What? The entire specification is in this git repo maintained by the home assistant team. Also, they’re on the zwave board now. It’s wholly open, but wasn’t maybe 4-5 years ago.

https://github.com/zwave-js/specs

SEJeff··on Zigbee vs. Matter over Thread:Understanding IoT Protocol Performance in Practice
Yes, zwave is in the much less congested 900mhz range. It is a fair bit more reliable as it doesn’t compete with:

- WiFi

- Bluetooth

- microwave ovens

Additionally, it’s a bit more strict with certification so you can easily use multiple vendors for zwave whereas with zigbee it’s often a terrible experience since vendors implement things differently in ways that are not as interoperable. In fact, for a device to be certified by the zwave alliance, it must pass strict conformance testing to ensure backwards compatibility and interoperability.

SEJeff··on Zigbee vs. Matter over Thread:Understanding IoT Protocol Performance in Practice
I’m a bit surprised they didn’t add zwave into this comparison.
SEJeff··on Stacked PRs are now live on GitHub
I found the single gerrit user, who downvoted me :)
SEJeff··on Stacked PRs are now live on GitHub
RIP Gerrit
SEJeff··on The future of Flipper Zero development
It isn’t really a meme if it’s true is it?

Note: am not furry, but have worked with several.

SEJeff··on OpenCV 5 Is Here: The Biggest Leap in Years for Computer Vision
You win the internet friend
SEJeff··on Go Experiments Explained
I’m 42, never went to college (I joined the army) and am now a Principal Security Engineer at a serious computer security firm. I’ve got a background in Linux high performance computing and software engineering.

If I can do this, anyone can. I believe in you internet friend. In tech, every day’s a school. Embrace it and learn something new daily, or get left behind. You’ve got this

SEJeff··on Go Experiments Explained
Pick a problem you’re interested in and just work on solving it, in go. The best way to learn is to hit the rough edges and just keep going.

If an oldie like me can learn go well so can you

SEJeff··on Love systemd timers
Oh yes, because the well documented clean syntax of sys v init shell scripts was so nice.

If I never recall hacking in ulimit calls in the top of buggy shell scripts for crappy old services that done respect pam_limits it won’t be soon enough.

SEJeff··on A successful Japanese trial of a ramjet engine designed for Mach‑5 aircraft
This is why Ukraine is so excited to get up to 150 Gripens (with Meteor loadout) from the Swedes.
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