mhandley

60 ms·

631.
by mhandley 8y ago
It doesn't really matter if the airspeed is slightly incorrect. What matters is that the aircraft is telling you the airspeed is unreliable, because that distracts from the actual problem you face. https://aviationweek.co
632.
by mhandley 8y ago
Take a look at the graphs I linked to - they show this quite visibly. Both airspeed and altitude are taken from the pitot-static tubes, but these misread at extreme angles of attack, as the airflow isn't directly in the direction of t
633.
by mhandley 8y ago
Originally the captain was flying, and he was keeping up with MCAS using manual electrical trim. But near the end, he handed control to the first officer, so that he could read the quick-reference handbook and troubleshoot. And the first
634.
by mhandley 8y ago
The older 737 could do that too - it's known as a stabilizer runaway, and could happen if (for example) the stabilizer trim switch failed closed in the nose-down-trim position. It's something pilots train for, and there are trim-
635.
by mhandley 8y ago
Yes, that's correct. But the implications of AoA disagree are different for the older 737 and the Max with the new software installed. On the Max, this means that the plane will now fly differently at high AoAs than it did if the AoA
636.
by mhandley 8y ago
No, all 737s have two AoA sensors. The one on the captain's side feeds the flight control computer on that side, and the one on the first officer's side feeds the flight control computer on that side. At any one time, one comput
637.
by mhandley 8y ago
Boeing's software fix, announced today, is to compare readings from both angle-of-attack sensors and disable MCAS if they disagree significantly. The obvious question is why they didn't do this in the first place? One possibility
638.
by mhandley 8y ago
Your point #1 is incorrect. The problem with the larger engines is that their larger nacelles placed further forward produce extra lift at high angles of attack. This lift is further forward than the centre of mass. The certification req
639.
by mhandley 8y ago
And then there's mumps, which the MMR vaccine also protects against. I have permanent very loud tinnitus and am deaf in one ear due to catching mumps as a teenager.
640.
by mhandley 8y ago
The Boeing 737 bear straps fiasco is pretty sobering reading too: https://www.brandeis.edu/investigate/political-social-justic... https://www.aljazeera.com/programmes/peopleandpower/2010/
641.
by mhandley 8y ago
Here are the abstracts of the two Science papers. This isn't my area, and although it would be hard to prove causation, they do have good evidence that causation is plausible . That's probably as strong a claim as anyone would
642.
by mhandley 8y ago
Of course the reason you don't see any solar on that graph is because it's dark there right now. But yes, I'm also a little skeptical on these claims.
643.
by mhandley 8y ago
NASA runs the airline safety reporting system ASRS, which is where pilots anonymously report potential safety issues.
644.
by mhandley 8y ago
UK CAA just grounded 737 Max, and not permitting overflight either. https://www.bbc.co.uk/news/world-asia-47536502 "The UK Civil Aviation Authority has been closely monitoring the situation, however, as we do not
645.
by mhandley 8y ago
You're probably referring to this one - Thomson 737-300 at Bournemouth in 2007. Scary reading the full report: 44 degrees nose-up and 82 knots indicated air speed! https://www.gov.uk/aaib-reports/aar-3-2009-boeing
646.
by mhandley 8y ago
On the other hand, you could look at SIP for an example of what happens when you've an extensible ASCII-based protocol, and everyone and their dog decides to extend it. It's not pretty, that's for sure. I've come to re
647.
by mhandley 8y ago
Thanks - that's great! Wonderful that (absent CSS), it still works.
648.
by mhandley 8y ago
If you want a web server to test against, we're still running CERN 3.0 from 1994 (on early 1990s Sparc hardware too): $ nc www0.cs.ucl.ac.uk 80 HEAD /staff/m.handley/ HTTP/1.0 HTTP/1.0 200 Document fol
649.
by mhandley 8y ago
If we're going to depend on renewables for almost all electricity generation, this will require both energy storage, and installing more renewables than are needed for typical usage. This wouldn't be true if we had cheap energy s
650.
by mhandley 8y ago
This paper's an interesting read, about writing an OS in Go: The benefits and costs of writing a POSIX kernel in a high-level language https://www.usenix.org/conference/osdi18/presentation/cutler
651.
by mhandley 8y ago
The warehouse was not fully automated: The robots, complete with green flashing lights, are collecting crates of food that sit in stacks beneath the grid and delivering them to chutes, where human workers beneath take the number of items t
652.
by mhandley 8y ago
How would the receiver know a packet was lost? If only one packet was sent, it cannot know, so you always need a retransmit timer at the sender as the ultimate backstop for reliability. Any other trigger of retransmissions is an optimizat
653.
by mhandley 8y ago
I love the comment on sun-bleached black paint on the upper floors, but it's completely wrong. These black bricks are not black because they've been painted - they're black with coal soot from before burning coal was banned
654.
by mhandley 8y ago
Bamboo fabric is rayon, which is a semi-synthetic plastic. It's not at all clear this is good for the environment - according to this study, more than half the plastic microfibres in seawater are rayon: https://www.scienced
655.
by mhandley 8y ago
This nicely explains the relay's orbit and the trajectory they took to get there: http://www.planetary.org/blogs/guest-blogs/2018/20180615-que...
656.
by mhandley 8y ago
The nice thing about flow batteries is they have the potential to store energy for long periods while being relatively cost effective. All you need is larger tanks for the electrolyte. With Li-Ion batteries, the number of batteries you ne
657.
by mhandley 8y ago
And yet my 18 year old son has never known a different world. The easy availability of information is just how it always was to him. He can't really conceive of how hard it was to find out something. We've around 4000 books in
658.
Watch live: Russian spacewalk begins to inspect Soyuz leak repair(spaceflightnow.com)
3 points by mhandley 8y ago|0 comments
659.
by mhandley 8y ago
Right now, France is running almost carbon-free: 83% nuclear, 14% wind and 10% hydro: http://www.gridwatch.templar.co.uk/france/ But that works in part because they're also exporting 15% of their generation to the
660.
by mhandley 8y ago
Of course certificates should be managed properly, so this sort of thing should never happen. My suggestion is not instead of that, but in addition. The question is when your certificate management process has failed, what then? It&#x2

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