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Sagebrush posted:Almost as though this wasn't just another Elon Special, and somebody at NASA did put a little bit of thought into the human interface of this spaceship Absolutely impossible. The test pilot astronauts that have flown multiple spacecraft multiple times and had direct input into the capsule control design just left it up to an intern with xcode.
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May 31, 2020 02:37
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Memento posted:https://i.imgur.com/J0nuO0r.mp4 Fettuccini Afraido
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May 31, 2020 02:40
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Cojawfee posted:A sad day at the lightsaber factory.
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May 31, 2020 02:44
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Kith posted:Fettuccini Afraido 
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May 31, 2020 02:59
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Ornamental Dingbat posted:Barber chairs can ruin your day. I've been there. There's a moment of sheer terror that passes through you as you hear the tree crack, feel this piece of wood snap through your chainsaw. You let off the trigger, hoping its just the fibers snapping, and that the cracking stops. But it doesn't. It keeps going, each thunderous crack reverberating through the woods, as your swamper starts shouting "GET THE gently caress OUT!". Before you know it, you're scrambling down your escape route, hoping against hope that there's nothing that's going to trip you up as you run, looking over your shoulder at the giant slab of wood lurching murderously into the air behind the falling tree. I can't quite describe what its like, but its not a thought, it's more a gutteral utterance in your mind "Fall the other way you motherfucker, cmon fall the other loving way", and then whap, the whole tree falls down at once and that murderous slab of wood smashes into the ground like the biggest paddle you ever saw, eviscerating whatever it touches, rocks, dirt, and other trees. It's really not a fun time, and for months after the fact, I would not go near a tree if I didn't have an easy escape route. It really slowed down my production. Every once in a while, I still think about it. That whole experience is why I only cut with as much bar as I need, because that murderous slab of wood will loving launch you thirty feet or crush you with the same ease as a fly. It's also why I always impressed upon newer sawyers just how loving dangerous tree falling can be. 98% of the time, minor gently caress ups don't really mean too much. It's that 2%, where you don't sound a tree and it splits open like old rotten particle board or where the tree is under so much tension, that you can get seriously maimed or injured.
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May 31, 2020 03:20
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I'd like to know more about sounding a tree. Google search gives me nothing.
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May 31, 2020 03:36
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Ornamental Dingbat posted:I'd like to know more about sounding a tree. Google search gives me nothing. Well basically if a tree falls in the forest, does it make a sound? Sounding is the process of verifying a tree has the capability to make sound.
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May 31, 2020 03:40
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Ornamental Dingbat posted:I'd like to know more about sounding a tree. Google search gives me nothing. No one has had enough ambition
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May 31, 2020 03:41
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It's when you stick a metal rod up the tree's urethra for sexual pleasure.
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May 31, 2020 03:49
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Ornamental Dingbat posted:I'd like to know more about sounding a tree. Google search gives me nothing. Sounding a tree is essentially where you try to determine where bits of the tree are rotten/hollow. It's a very specific sound, I'd compare it to solidly smacking a kind of tune skin drum. Basically, way it works is two fold. The first is to peel away all the bark at the base of the tree where you'll be working. Then, with the flat side of your felling axe/your single jack, smack the wood, and I don't mean a limp-wristed smack. Give it a good solid thwack. And keep smacking it as you work your way around the tree.Doing this will give you an idea whats hollow/rotten. Hollow sounds kinda like knocking on a door, rotten sounds like a skin drum. Once you have an idea of what's rotten, you can plan your cut accordingly. A section of your hinge wood (the part on which the tree 'hinges' like a door as it falls) that's rotten isn't gonna do you much good in terms of holding your tree or directing your fall. Same deal with a hollow tree for obvious reasons. The other step you can take is to bore the tree - that is, using the attack end of the nose of your bar, bore into the tree until you either come out the other side or can no longer get any deeper into the wood. If you're able to suddenly push the saw forward easily, that area is hollow. Then, look at the chips that came off your saw. Anything that looks like saw dust off construction lumber is Good Wood. Anything that's dirty, wet, or didn't even form chips is rotten. Sometimes when you do this you might actually hit a pocket of water, releasing an utterly foul sludge of water, decay, and black mold that might make you gag. That area is obviously rotten. It's generally speaking a good idea to do both of these things when you're falling a snag (another word for dead tree). The longer its been dead, the easier it will be to separate the bark from the trunk, though some species are really hard for you to do this to even if they've been dead for decades (incense cedar comes to mind) I should also state that it's important to bore the tree perpendicular with your pie cut, that is, where you bore should be your face cut is being constructed, because trees rot unevenly. Your bore will only tell you the condition of the wood that it cuts through, not the condition of the entirety of the tree. Generally speaking, you want to do this to dead trees, which will be obvious if its a conifer of some kind (evergreen trees with no needles at all = dead) or if its a leaf-bearing tree in the middle of the summer (ie everything else). You may also want to do this to a tree if that tree shows signs of healed over wounds, rot, or decay even if its still alive. Oak trees are especially notorious for being hollow but still alive, but I've seen lodgepole pine that were 95% hollow and still living. It takes time to develop an eye for this kind of stuff, but I can tell you that if your gut feeling is "this fuckers totally rotten" its not a good idea to start cutting on it. Rotten trees are impossible to technically fell - they're usually so mushy that driving to drive a wedge into the backcut will just make the tree sit back on the wedge. Trying to rope them over is an equally dicey proposition because they can actually break apart from the force of the pull of the rope. I felled almost exclusively dead trees for three years, and there were more than a few trees that I said no too, because its a really bad idea to tangle with a tree you're not comfortable with. I'd further state that if you really want to get into sawyering, taking the National Wildfire Coordinating Group's S-212 chainsaw class (which is meant for firefighters), is a really good intro into doing this stuff for a living.
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May 31, 2020 04:13
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If you get a dangerous tree that you can't tackle with a saw or rope, what do you do? Dynamite?
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May 31, 2020 04:29
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McGavin posted:It's when you stick a metal rod up the tree's urethra for sexual pleasure. Paul Bunyan's Fetlife Account
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May 31, 2020 04:32
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Ornamental Dingbat posted:If you get a dangerous tree that you can't tackle with a saw or rope, what do you do? Dynamite? Ideally, yes. Blowing up trees has a long and storied history here in CA, where they literally used to do that to Sequioas if the landowner deemed it necessary. I got to watch a trail Master Blaster use a boulder buster (which is meant for cracking a two ton boulder into smaller pieces) to fell a tree. But, there's a variety of things you can do. Ignore the danger of it and just go for it is a common avenue. Have an arborist roped into another tree try to piece it down is another common one, and in more delicate situations with good access, literally craning it out isn't unheard of. But if there's no imminent threat, leaving it stand is a perfectly valid option.
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May 31, 2020 04:40
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Whatever you do though, don't put a face cut in a tree and then go "This is hard, gently caress this" and walk away. Sawyers get all kinds of legal responsibility when they start working on a tree - if that tree falls on a biker on a trail because that rear end in a top hat didn't stop when the trail guard told him too, the sawyer is the one responsible. Basically, if you ain't sure you can fell it and not destroy property and people in the process, don't do it. And especially so if you have to put your own life in great danger to do so. Don't kill yourself for trees, that's stupid.
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May 31, 2020 04:42
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I'm assuming dynamiting a tree is like the payoff to this video. https://www.youtube.com/watch?v=AJgYtt99V5s
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May 31, 2020 04:44
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The thing I noticed about the video is his various failed attempts to scramble away. You always sort out your escape route before you start cutting and know exactly what you're going to do if you need to run.
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May 31, 2020 05:09
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Kith posted:Fettuccini Afraido Has it not been long enough between thread titles?
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May 31, 2020 05:16
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https://twitter.com/xomputer/status/1266855922539913216 fuckin'  
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May 31, 2020 10:18
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Sounds ok to me?
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May 31, 2020 10:22
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Yeah it sounds fine honestly I would prefer more redundancy though. Like why not any other odd number? Wouldn't that provide more accurate data?
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May 31, 2020 10:27
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Radiation in space is often in the form of bursts, which basically wash down the entire craft in proton energy and can energise the hull and instruments to a level that can destroy the instruments. Have as many non-rad-hardened computers as you want, because if you get hit by one of these things, they're all going to stop working.
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May 31, 2020 10:35
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Javascript/Chromium flight interface is comedy gold, but if we’ve accepted that astronauts are not pilot but self-loading cargo, whatever. The part that gives me more pause is “triple redundancy gives the system radiation tolerance without the need for expensive rad hardened components”. There’s a reason rad hard hardware exists, and it isn’t “engineers never considered using redundant computers”. If I may make a car analogy, redundancy is giving a car six pneumatic wheels and designing it so it can drive on three. Hardening is making the wheels out of steel. Which one can drive over more nails? It’s an Elonesque solution. It’s like “we can just melt rock to make the walls of our tunnel”. I mean I doubt that he did any more actual engineering work than Von Braun, but if he had, that’s what it would look like. That said, computers can be irradiated in the lab, and presumably they flew on dozens of cargo flights with at most one computer failing. I still don’t like the sound of it. Platystemon fucked around with this message at 10:56 on May 31, 2020 |
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May 31, 2020 10:51
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I hope that is an over-simplification, because 'well, we laid it out on a table and ran it a few times, unplugging a few things and it all seemed to work' seems somewhat lacking as a rigorous test methology.
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May 31, 2020 11:00
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https://i.imgur.com/m4YVybh.mp4 Oops, glad I’m not dead...
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May 31, 2020 11:58
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Let's talk about police work safety for a moment https://twitter.com/AramShabanian/status/1266875523369562112
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May 31, 2020 12:19
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You normally vote and have radiation hardening. I'm not sure you'd pass a FMEA in this application without both but technically you can armor less than if you wanted to ignore voting and reach an acceptable risk so someone might say "you get to worry less about radiation hardening when voting at every step!" Especially at a trade conference where they are bragging in the bar. The thing that confused me more is are flight computers not real time? Is this some hell application that was made to be C running real time-ish in Linux on an X86? Moo the cow posted:I hope that is an over-simplification, because 'well, we laid it out on a table and ran it a few times, unplugging a few things and it all seemed to work' seems somewhat lacking as a rigorous test methology.
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May 31, 2020 12:29
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https://i.imgur.com/59tg3bP.mp4 Run
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May 31, 2020 13:09
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Here's a fun one for you, from my backyard. Two ancient maples, one dead, one hanging on. The dead one hanging on as well, actually...   The arborist I work with noted it would be good as an exhibit or something but he's not going anywhere near it. Fortunately I don't walk underneath.
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May 31, 2020 13:17
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zedprime posted:The thing that confused me more is are flight computers not real time? Is this some hell application that was made to be C running real time-ish in Linux on an X86? Yeah this is the scary part (besides redundancy being useless if they all get irradiated at once). Not only is Linux not really appropriate for hard real-time workloads (it will probably be fine but there are lots of better options here), x86 isn’t appropriate for these kinds of real-time loads either thanks to SMM being able to preempt the system whenever it wants and the OS has no control. Probably can’t run loving Electron for your UI on an appropriate real-time Unix on a decent architecture, though.
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May 31, 2020 15:07
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Me after I binge Taco Bell at 2am after a night of drinking
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May 31, 2020 15:30
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Gaukler posted:Yeah this is the scary part (besides redundancy being useless if they all get irradiated at once). Not only is Linux not really appropriate for hard real-time workloads (it will probably be fine but there are lots of better options here), x86 isn’t appropriate for these kinds of real-time loads either thanks to SMM being able to preempt the system whenever it wants and the OS has no control. Probably can’t run loving Electron for your UI on an appropriate real-time Unix on a decent architecture, though. In a thousand years we find 128 Raspberry Pis with a spaghetti of USB Micro-B and Ethernet cables wrapped in tin foil to protect them, all running Ubuntu Desktop with the constant rainbow box in corner on the single lovely 3.5in TFT. No clustering OS's or management. Hey, i worked!
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May 31, 2020 15:35
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Gaukler posted:Yeah this is the scary part (besides redundancy being useless if they all get irradiated at once). Not only is Linux not really appropriate for hard real-time workloads (it will probably be fine but there are lots of better options here), x86 isn’t appropriate for these kinds of real-time loads either thanks to SMM being able to preempt the system whenever it wants and the OS has no control. Probably can’t run loving Electron for your UI on an appropriate real-time Unix on a decent architecture, though. If you receive a dose that just flat out bricks all 3 voters the spacemen probably aren't going to be ok biologically.
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May 31, 2020 15:56
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Humphreys posted:In a thousand years we find 128 Raspberry Pis with a spaghetti of USB Micro-B and Ethernet cables wrapped in tin foil to protect them, all running Ubuntu Desktop with the constant rainbow box in corner on the single lovely 3.5in TFT. No clustering OS's or management. Hey, i worked! And all of them bricked because the drives were full when they forgot to set up log rotation on their stock Ubuntu install, just like the Teslas. zedprime posted:Ionizing is very spatial and the wires to and from a microcontroller and other spatial orientation mean you aren't going to flip or fry the same bits in identical hardware receiving what is functionally measured as the same general dose. Voting is valid (and again required to hit your probability in the FMEA short of a lead casket) way to manage something probability based like that. Just about everything votes on a spacecraft unless it's a very simple ionizing proof device. Depending on the weight of the microcontroller you start seeing ridiculous stuff where the weight tradeoffs means you have weird poo poo like 5+ voters. That’s fair, I know admittedly little about rad-hardening or how it affects electronics.
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May 31, 2020 15:57
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Holy poo poo
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May 31, 2020 16:04
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Gaukler posted:Yeah this is the scary part (besides redundancy being useless if they all get irradiated at once). Not only is Linux not really appropriate for hard real-time workloads (it will probably be fine but there are lots of better options here), x86 isn’t appropriate for these kinds of real-time loads either thanks to SMM being able to preempt the system whenever it wants and the OS has no control. Probably can’t run loving Electron for your UI on an appropriate real-time Unix on a decent architecture, though. "Linux" can be anything from a fully qualified and vetted hard-real-time system that fits in 1 megabyte to the latest release of [OXYGEN OS][ONEPLUS 7T][DECRAPIFIED][MAGISK][auto-root].zip. I doubt that they're using a release of Ubuntu. Also the SMM event handlers are encoded in the BIOS iirc so there is no reason they couldn't just strip that functionality out entirely if they felt it was a risk. Platystemon posted:It’s an Elonesque solution. It’s like “we can just melt rock to make the walls of our tunnel”. I mean I doubt that he did any more actual engineering work than Von Braun, Elon Musk has never done any engineering work in his life. He holds an undergraduate degree in physics (which took him eight years to complete) and registered for a PhD program at Stanford but dropped out before the first day of class. His most extensive professional experience prior to entering the investor class was web development.
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May 31, 2020 16:13
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Elon is touted as this engineering galaxy brain when in reality he’s a charismatic ideas guy who lucked into a lot of things and seeded his career with PayPal bux
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May 31, 2020 16:17
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Sagebrush posted:Elon Musk has never done any engineering work in his life. He holds an undergraduate degree in physics (which took him eight years to complete) and registered for a PhD program at Stanford but dropped out before the first day of class. His most extensive professional experience prior to entering the investor class was web development. It's actually an economics degree lol. The 8 years part is true though. Also iirc Stanford said they have no records of him being accepted to their program.
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May 31, 2020 16:24
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CAPTAIN CAPSLOCK posted:It's actually an economics degree lol. The 8 years part is true though. I think it is a dual-major in economics and physics and I was being as generous as possible. And I recalled that Stanford said that he had never taken any classes there, but lol if he actually wasn't even accepted and the "started a Stanford PhD but dropped out" is not just an exaggeration but a plain old lie
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May 31, 2020 16:28
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Moo the cow posted:I hope that is an over-simplification, because 'well, we laid it out on a table and ran it a few times, unplugging a few things and it all seemed to work' seems somewhat lacking as a rigorous test methology. It’s also from four or five years ago.
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May 31, 2020 16:54
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zedprime posted:
Would it? It just needs to run a high enough voltage between components to kill the computers. Humans are a lot more resistant to shocks than a CPU.
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May 31, 2020 17:08
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