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jackmott42

1,584 karma · joined June 17, 2022

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jackmott42··on OpenAI agrees with Dept. of War to deploy models in their classified network
You are naive, and assisting a fascist regime.
jackmott42··on Ventum, Dimond, Cervelo – Why do these triathlon bikes look so weird?
The racing frames here don't break as a rule as OP suggests, if one does there was a manufacturing flaw or a crash/impact of some kind.

A few grams of weight does not have enough impact TT bike performance enough to make it worth shaving 100 grams if it risks reliability.

jackmott42··on Y Combinator CEO Garry Tan's online rant spurs threats to supes, police reports
What a terrible human being, why would anyone want to be involved with Y Combinator or any of their companies that would put up with this sort of behavior?
jackmott42··on There's No Good Reason to Buy a Carbon Bike
There used to be a video on youtube of a carbon mountain bike fork, and they were SMASHING it with a ball peen hammer, repeatedly. It did do a little damage but remained rideable, and was in much better shape than the metal forks they smashed.
jackmott42··on There's No Good Reason to Buy a Carbon Bike
This has no practical impact on actual bicycles though, in practice they all fail, at similar rates.
jackmott42··on There's No Good Reason to Buy a Carbon Bike
"There is no speed benefit for a non professional on a carbon frame"

Yes there is, I and many people have directly measured it.

jackmott42··on There's No Good Reason to Buy a Carbon Bike
Carbon fiber bikes have two main properties that can affect performance:

1. they are a little lighter. This doesn't matter nearly as much as most cyclists think, but it does matter a bit. If you race competitively in the mountains, you might care.

2. There is more design freedom for shaping them aerodynamically. This makes a bit more difference than weight, and if you are competing you definitely want it.

jackmott42··on There's No Good Reason to Buy a Carbon Bike
That is a myth. Material alone doesn't determine this, and modern road bikes are on 28mm tires at ~70psi so this isn't nearly as much of an issue as it was 20 years ago (and it wasn't a real issue then either)
jackmott42··on There's No Good Reason to Buy a Carbon Bike
This is a misconception. Carbon fiber mountain bikes are not more delicate. Designed properly they are more durable. The idea that carbon fiber is innately delicate comes from road bikes designed to be as light and stiff as possible, and they can end up brittle, and weak in areas that don't normally see stresses. Not all road bikes are designed like this, even high end ones, but some early ultra light bikes were.

Bikes that need to be durable use different types of fibers that can bend more before cracking, and may include layers of kevlar or other composites with more 'toughness' in key areas. My wife has a carbon fiber mountain bike and has been racing every weekend, winning, jumping, crashing, riding every day, for 3 years now, bike is fine.

jackmott42··on Solid-state EV batteries now face "production hell"
Don't forget that you can only extract about 30-35% of that energy via combustion, though. Whereas a battery with an electric motor you get more like 90%

Another knock against gasoline is that you spend about 1 EV battery pack of energy to refine a cars tank of gasoline from crude oil in the first place.

jackmott42··on Tesla's in Serious Trouble
Why is that? He has been behaving terribly, I would be concerned about the ethics of anyone who doesn't hate him at this point.
jackmott42··on Hertz to sell 20k EVs in shift back to gas-powered cars
Definitely Teslas became less attractive to a lot of people with Musks behavior in the last year. But also interest rates are up, and EV enthusiast market may be saturated, so now you have to win over just regular people.
jackmott42··on Who makes the most reliable new cars?
Because they want to completely disconnected the big battery when not in use to prevent phantom drain, and you need a little power to run passive systems that need to be on still (like remote keys etc).

Some EVs like Tesla now use a separate lithium ion 12v battery that should last forever, instead of a lead acid 12v battery with a limited life span.

jackmott42··on I think C++ is still a desirable coding platform compared to Rust
Even brilliant developers on the Linux kernel teams and Postgres teams make memory mistakes that lead to security problems.

Maybe you are at a higher level than them though.

jackmott42··on Ubuntu squeezes more performance than Windows 11 on new AMD Zen 4 Threadripper
Pretty sure Microsoft is very cooperative on working with AMD and others on this stuff, it may just take a little longer in this case.
jackmott42··on Charging a lithium battery to 80% only?
The battery ages faster the more it is charged. It is approximately linear. Nothing special about 80%, you could draw the line anywhere.
jackmott42··on I trapped scammers in an impossible maze [video]
Web Dev sometimes isn't. Sometimes it is CSS and HTML and art/design specialty. I don't say that to be a gatekeeper, I think CSS expertise is harder! heh
jackmott42··on Home schooling's rise from fringe to fastest-growing form of education
Hard to look at the current state of American Christianity and think of it as deep care.
jackmott42··on Apple unveils M3, M3 Pro, and M3 Max
The max is probably only going to be in desktops, so better to use the die area for other things than E cores
jackmott42··on Tesla discloses DOJ probes over vehicle range, personal benefits and more
It is a bit more complicated than that, car makers do the test themselves, EPA can spot check, and manufactures can choose between two methods, one of which comes up with a bigger number, and is reflective more of city driving than highway driving.

imho, I fault the EPA for not having a sensible highway range/city range as a standard, then none of this would be an issue

jackmott42··on Tesla discloses DOJ probes over vehicle range, personal benefits and more
on the tesla, they are as the baseline, the multiplied by estimated capacity remaining
jackmott42··on Tesla discloses DOJ probes over vehicle range, personal benefits and more
He had a kid come out as trans, and a girlfriend leave him for a trans person right before he made this shift as well.
jackmott42··on How to run 50% faster without external energy (2020)
No it did not.
jackmott42··on How to run 50% faster without external energy (2020)
This is false, even cyclists who think they pull up and pull back do not, and it is less efficient to do so. However it is a VERY common misconception that you should do this.
jackmott42··on Billionaires should face a minimum tax rate, report says
Nope, because he used a loan, so he was able to buy twitter and not pay taxes. He will have to pay taxes if and when he pays off the loan, maybe.
jackmott42··on Billionaires should face a minimum tax rate, report says
Elon bought twitter with unrealized capital gains.
jackmott42··on Amazon reaches 10k Rivian electric delivery vans in US
The one driver I asked said he loved it
jackmott42··on Gnome Foundation Hires "Professional Shaman" as New Executive Director
In principle it isn't any more unhinged than the millions of people we work with who think Christianity or Judaism are real. If her Shamanism makes you uncomfortable, this is how many of us non religious people feel about all of you all the time.
jackmott42··on Low serotonin levels might explain some Long Covid symptoms, study proposes
This happens all the time with sports overuse injuries also. Kinesio tape, acupuncture, chiropractor adjustments, heat, ice. People try all kinds of things, eventually you get better. Whatever you tried last seems like it helped. But who knows.
jackmott42··on Cecilia Payne-Gaposchkin
The time period from around 1600->1900 is so fascinating, in that there are some things we had correctly figured out that are just amazing, and other things where we were so far off it seems embarrassing in retrospect. It must have been a fun time for curious people, quite a lot you could discover without huge teams and huge sums of money and equipment.
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