frederikvs

7 ms·

1.
The Apollo Guidance Computer Talk (2017) [video](youtube.com)
4 points by frederikvs 6mo ago|0 comments
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by frederikvs 7mo ago
Sounds like it could improve the production efficiency of glyptal-impregnated, cyanoethylated bushings for turbo-encabulators!
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by frederikvs 7mo ago
I'm a diver, DAN is the only company I can name that specialises in diving insurance. Huh, apparently they're registered in Malta, what a coincidence...
4.
by frederikvs 1y ago
Removing the brown ones from a bowl of M&Ms is a 5 minute job that can be handled by anyone. I would expect a lot of people would go "well that's a bit eccentric, but if it makes the band happy, why not". I doubt the band
5.
by frederikvs 2y ago
> To use a dog metaphor, a chainsaw tends to growl before it bites. I believe the author is mistaken about why chainsaws don't cause more harm than they do. There are multiple of ways in which a chainsaw will kill or destroy, withou
6.
by frederikvs 2y ago
This is why I need to have 10 different map apps on my phone. I hate it. Google maps is good enough for find my way in a city, or getting to a destination by car. And when I get there, I whip out another app to pay the parking. If I forget
7.
by frederikvs 2y ago
Linux's `make menuconfig` [0] and GDB's TUI interface [1] are the first ones that come to mind. Both are very powerful once you get to know them a bit, and are still valuable tools today. [0] https://en.wikipedia.org&#x
8.
by frederikvs 2y ago
From the article, Proba-3 has 10 thrusters, so that would bring the total to 150 Watt. I don't know the power budget for the satellite, but we can make an educated guess : the occulter is 1.4 meter diameter, or a surface area of 1.54 s
9.
by frederikvs 2y ago
Many observations of the sun's corona just use a disk attached to the telescope, as you're suggesting [0]. However, for Proba-3 they want the disk to be over 100m away from the telescope, which isn't practical. Also, one of t
10.
by frederikvs 2y ago
I'm not familiar enough with the project to answer why specifically cold gas thrusters were chosen. What I can say : if old, proven technology will get the job done, there's a strong preference to use that. When needed to achieve
11.
by frederikvs 2y ago
The goal is to have them a bit more than 100m apart. During observations they aim to maintain millimeter precision. I'm pretty sure the risk of collision has been analysed to death. I would expect they've analysed what would happe
12.
by frederikvs 2y ago
From what I can see on wikipedia [0] the first FEEP to be used in space was in 2018. Proba-3's implementation phase started in 2014 [1]. The choice of thruster technology was probably made well before that. They wouldn't use a tec
13.
by frederikvs 2y ago
That's what's been done so far [0], both on the ground and in space. As I understand it, the further your disk is from your telescope, the better. But your stick needs to be rigid enough to keep the disk exactly in its place. And
14.
by frederikvs 2y ago
I work at the company building these satellites, I've seen them sitting in our clean room. If there's any questions, I might be able to give some answers. However, I'm not involved with Proba-3 directly, so no guarantees.
15.
by frederikvs 2y ago
I would expect James Webb has the same issue, and similar ways of dealing with it. It's just that it never hits the press, since it's a normal part of operations. I'm not sure why Euclid's icing issue is getting some att
16.
by frederikvs 3y ago
I believe the primary goal was stage separation. Secondary goals were for the booster to make a controlled splashdown, and Starship to make almost a complete orbit, before splashing down near Hawaii. So they achieved the primary goal, which
17.
by frederikvs 3y ago
The last few falcon launches weren't on YouTube, only on X.
18.
by frederikvs 3y ago
You should be able to watch it on the spaceX website too [0]. I don't know what quality to expect though. [0] https://www.spacex.com/launches/mission/?missionId=starship-...
19.
by frederikvs 3y ago
There's a recent article about a climber who had to use this iPhone SOS feature. Turns out that actually getting in contact with emergency services is not easy - even though the satellite communications worked perfectly. There was a lo
20.
Hot-fire test of Ariane 6 core stage on launch pad [video](youtube.com)
3 points by frederikvs 3y ago|0 comments
21.
by frederikvs 3y ago
A bit further in the article : > Of course, the same device couldn't have been used in a standard cryptic crossword as word length breakup of solutions - (7, 7) vs (3, 4, 7) - would have given the game away. Clinton would be 7 lette
22.
by frederikvs 3y ago
The thrust of 100 tonne isn't really that important IMO. The Raptor has far less thrust than the F-1 engine used on the Apollo missions, but if you strap 33 Raptors to a rocket, they can beat five F-1s.
23.
by frederikvs 3y ago
I'd say it's pretty impressive. Building and igniting a rocket engine is hard. For more detail, I can recommend watching "Why starting a rocket engine is so hard" by Tim Dodd [0]. It's not "never been done befo
24.
by frederikvs 3y ago
ESA really needs to work on how they present this kind of thing. Igniting a brand new rocket engine is a sensational event - I would have expected at least a video of the full 12 second burn, from a good viewpoint. Ideally from multiple cam
25.
by frederikvs 3y ago
> If there's an AED around to use instead that would be FAR more preferable. AEDs still require chest compressions. In fact, they'll give you rhythm to follow and talk you through it. I would expect a very similar rate of injur
26.
by frederikvs 4y ago
I'm not involved with the study, just a bit of space nerd, so this is just an outsider making a guess. But I see 2 aspects to it. The first is a whole bunch of practical questions. Do they need to modify the spacesuit to account for th
27.
by frederikvs 4y ago
John McFall, the person chosen for the parastronaut study, probably is one of the very fittest humans we can send. Participated in paralympics and all that. He probably runs faster than many of the other astronauts that made the selection.
28.
by frederikvs 4y ago
My interpretation was always that the do-nothing script was just a starting point - once you have it, you can gradually start automating the steps. Once the script actually automates a few of the more tedious steps, people are much more lik
29.
by frederikvs 4y ago
I really wish the article would give easy to remember explanations. E.g. it mentions :wq means "exit after saving". Explaining :wq as "write and quit" makes it a lot easier for new vim users to remember.
30.
by frederikvs 4y ago
I doubt this is specific to the internet. Seems to me that people have always had a tendency to separate everyone else into "good people" and "bad people".

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