danielvf

39 ms·

391.
by danielvf 8y ago
By having each redundant flight computer hooked to completely different sensors, in case of a bad sensor the crew can bypass not only the sensor, but also any computation done with that sensor. It's not a single point of failure as we
392.
by danielvf 8y ago
Here's a video from a few years ago of two student pilots handling a trim runaway in a 737 simulator. https://www.youtube.com/watch?v=3pPRuFHR1co&t=154 You'll notice that it's a loud, physical event, with
393.
by danielvf 8y ago
Yeah, when the trim is a giant screw changing the angle of the whole stabilizer, rather than just a little tab, it's a whole different ballgame. There are plenty of single components on an airliner whose failure can cause a stabilizer
394.
by danielvf 8y ago
There's something called the "Swiss Cheese Theory" of accidents. ( https://en.wikipedia.org/wiki/Swiss_cheese_model ) In a mostly-robust system, different layers catch and defend against the errors of othe
395.
by danielvf 8y ago
Thanks!
396.
by danielvf 8y ago
Embraer 190? There are no non-electrical trim controls in the cockpit. http://www.smartcockpit.com/docs/Embraer_190-Flight_Controls... Whereas a 737 has physical cables connected from wheels in the cockpit to the sta
397.
by danielvf 8y ago
Let's say you hear a knocking sound from your car engine. You take it to a mechanic for repairs, and the mechanic says he fixed it. But you still hear the knocking sound. If you repeat this cycle for a few times, when the mechanic says
398.
by danielvf 8y ago
You can still disable the stabilizer trim from switches in the cockpit, though. This was in the checklists that the pilots had, and done by other pilots in that aircraft in the days before the accident.
399.
by danielvf 8y ago
The 737 is a short and stubby airliner with its center of thrust far below the rest of the aircraft. The 737MAX version added upgraded, powerful engines. It is theoretically possible for the engines to flip the aircraft up and out of contro
400.
by danielvf 8y ago
https://www.google.com/amp/s/amp.theguardian.com/world/2018/... “Indonesian investigators have said the Lion Air Boeing 737 jet that plunged into the sea, killing 189 people in October, was not airw
401.
by danielvf 8y ago
That aircraft was being knowingly flown with [edit: a broken sensor]. It was unsafe on takeoff. The final problem that brought the aircraft down - the trim run-away - happens all the time in airliners you've flown in. When the run-aw
402.
by danielvf 8y ago
Even though the Elon's submarine idea wasn't used, at least one little known piece of American engineering was used in the rescue - the "Sked". It's a stretcher that can rolled up for storage and transportation, the
403.
by danielvf 8y ago
Another great article: https://www.nytimes.com/2018/07/12/world/asia/thailand-cave-...
404.
by danielvf 8y ago
The US is adding a lot of solar generation - in just the last two years our solar electricity generation increased by more than the total solar output of Germany.
405.
by danielvf 8y ago
Coal [electricity] in the US is down to 60% of what it was ten years ago. Since the second half of 2015, the US has been generating more electricity with natural gas than with coal. The current difference between them is larger than the ent
406.
by danielvf 8y ago
This is amazing! I'll be letting my kids play with it tomorrow! And JS is a great choice.
407.
by danielvf 8y ago
In winter Oslo averages 10C lower high temperatures and an hour and half less sunlight than Amsterdam. Oslo is also less dense, and spread around both sides of a fjord.
408.
by danielvf 8y ago
It seems like the party of the administration is the one voting in favor of ending the shutdown? [Edit: No long as clear cut. Now both parties are voting against each other's ending bills. http://clerk.house.gov/evs&#x2
409.
by danielvf 8y ago
I made a white humaaan for you. It has some readability problems. :) https://danielvf-downloads.s3.amazonaws.com/2019/whumaaan.pn...
410.
by danielvf 8y ago
Nah, there's a simple explanation. Humaaans uses an artistic style of solid patches of color against a white background. Very light skin tones work terribly in this style because they disappear into the background.
411.
by danielvf 8y ago
This is kind of cheating. :) This solution doesn't really cover the core problem in the dining philosophers puzzle - that your philosophers can't communicate with each other or some external system to coordinate! Having a single e
412.
by danielvf 8y ago
It’s an extremely good book. Not only useful to a system designer, but anyone who ever interacts with bureaucracies, or who works in organizations with more than ten people.
413.
by danielvf 8y ago
Yeah, California law has no delay if the right sign is posted. I don’t think that’s uniform across the US though.
414.
by danielvf 8y ago
This has been a thing with cars in the US for a long time. If you leave your car for days in some business's parking lot, then they will call a tow service who will pick up the car at no charge to the business owner, then charge the ca
415.
by danielvf 8y ago
Venezuela's oil situation is a Venezuelan government inflicted wound. The production declines due to governmental mismanagement are bigger than the oil price changes. Crude oil production is down to 50% of what it was when Chavez took
416.
by danielvf 8y ago
The US's massive increase in production in 2018 seems to be a pretty natural outcome of the free market. Oil prices go up. Mind-bogglingly huge investments go into getting previously impossible-to-get oil out of the ground. These techn
417.
Full lunar eclipse tonight(nytimes.com)
1 points by danielvf 8y ago|0 comments
418.
by danielvf 8y ago
If you are self-employed in the US, you pay an additional tax before you even start your regular taxes, and this tax isn't affected by your personal deductions. You also need to pay for your own computers, SAAS services you use, etc. T
419.
by danielvf 8y ago
If you are US based, you can charge more than that, even in a low cost of living area. There is currently quite a bit more work than devs.
420.
by danielvf 8y ago
According to the CDC, in 2013, there were 3,932,181 live births and 23,446 infant deaths (from birth to age one). That checks out with a 6 in 1000 ratio.

More ›