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carpathia definitely got a lot more power out of her engines than designed for, but she was barely over half hull speed
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Feb 21, 2019 16:26
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xergm posted:Am I missing something with this one? This is exactly how the Time Warner guy serviced my cable back at my old residence when it went out. No, you’re right. People just aren’t familiar with how the cables work.
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Feb 21, 2019 16:34
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I think the big thing is all "welp, those cables could snap!" when they don't realize they're actually pretty strong, not to mention the weight isn't entirely on the cables as well.
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Feb 21, 2019 16:36
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I had some training about climbing ladders for maintenance/repair of phone lines about 20 years ago. Part of it was using a ladder mid span on phone lines. The phone lines had a steel support wire that you were actually hanging the ladder off of. Doesn’t stop the ladder from bouncing a bunch when you climb up to the top. Luckily most of my work was burying phone lines from the local pedistel to the house. I didn’t have to climb but a handful of times in two summers working.
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Feb 21, 2019 16:48
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iospace posted:You do realize whistleblower protections exist for this very reason. Yeah, which will theoretically protect you from retaliation while you blow all your resources in court fighting against having been retaliated against until an eventual pyrrhic victory. Allegedly.
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Feb 21, 2019 17:50
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Dirt Road Junglist posted:Yeah, which will theoretically protect you from retaliation while you blow all your resources in court fighting against having been retaliated against until an eventual pyrrhic victory. No pyros involved in constructing a guillotine.
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Feb 21, 2019 17:52
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PHIZ KALIFA posted:No pyros involved in constructing a guillotine. Release the blade with explosive bolts. Don't want to get any blood splatter on you, that's a biohazard after all.
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Feb 21, 2019 18:00
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Luneshot posted:Release the blade with explosive bolts. Don't want to get any blood splatter on you, that's a biohazard after all. re-raise the blade with explosive charges for the next client. Hell, with enough explosives on both ends you could get guillotine cycling going pretty fast!
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Feb 21, 2019 18:05
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a mad max car but with a rotary guillotine engine, powered by the blood of plutocrats how do i make that osha safe. assuming. that the managerial class are not "human". for the sake of regulatory ease.
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Feb 21, 2019 18:07
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Feb 21, 2019 18:08
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Evilreaver posted:re-raise the blade with explosive charges for the next client. Hell, with enough explosives on both ends you could get guillotine cycling going pretty fast! Just attach the explosives to the skull, maybe with some sort of shaped charge involved. Saves on construction and logistics! And it's portable!
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Feb 21, 2019 18:12
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Feb 21, 2019 18:12
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dee eight posted:
Hahaha christ
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Feb 21, 2019 18:15
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Oh man, I was suddenly reminded of this: The Field Marshall Tractor! A kind of unremarkable British built tractor from the 1940s-50s, interesting because you start it with a shot gun cartridge instead of cranking it like most old engines. https://www.youtube.com/watch?v=pnkSPB-9BmQ&t=536s Here's a clip from a docu series I am waaay too into showing how they start it.
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Feb 21, 2019 19:47
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sandoz posted:carpathia definitely got a lot more power out of her engines than designed for, but she was barely over half hull speed People always love exaggerating the Titanic disaster for some odd reason. This is easily one of the best videos I've seen on it. Pretty straightforward, and the guy's entire channel is really well researched and put together. Do recommend. https://www.youtube.com/watch?v=bfk0tyxmdyQ Zipperelli. fucked around with this message at 20:16 on Feb 21, 2019 |
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Feb 21, 2019 20:14
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big dyke energy posted:Oh man, I was suddenly reminded of this: That was a thing for a while in airplanes and armored vehicles. https://www.youtube.com/watch?v=65qrzgbTTcQ
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Feb 21, 2019 20:43
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sandoz posted:carpathia definitely got a lot more power out of her engines than designed for, but she was barely over half hull speed yeah i found that post about the carpathia really tiresome.  Let's take out the contradictions, effusive exaggerations, needless repetition, and tumblresque language: "Captain Rostron ordered all steam used for heating diverted back to the engines to maximize power. Carpathia's rated top continuous speed was 14 knots, but in this emergency the crew were able to push the ship to nearly 17.5 knots for a few hours." I need you to understand that ships very much can exceed their rated top speed you exhausting ninny. It's not good for reliability but it is clearly possible, as evidenced by your own goddamned statement three sentences later. Moron
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Feb 21, 2019 20:44
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Sagebrush posted:yeah i found that post about the carpathia really tiresome. beep boop the only relevant part of a piece of writing is the technical detail boop beedle beep
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Feb 21, 2019 20:48
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Captain Foo posted:beep boop the only relevant part of a piece of writing is the technical detail boop beedle beep It's awful loving writing that contradicts itself from sentence to sentence. It's possible to write a dramatic story without resorting to tabloid tumblr clickbait poo poo.
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Feb 21, 2019 20:53
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sandoz posted:carpathia definitely got a lot more power out of her engines than designed for, but she was barely over half hull speed To achieve her calculated hull speed of between 31~32 knots, she would need approximately 55k shaft horsepower. If you take her actual design max speed of 15.5kn and work backwards you get a designed shaft horsepower of 11442. Just because the hull speed was so much higher doesn't mean it wouldn't require 5x as much engine power as she had in order to get to that speed! The posted article does stretch things a bit to make it read more exciting (mis-stating her designed max speed for example), but the crew really did manage to get some great performance out of the Carpathia, as she had only ever reached the 15.5kn maximum design speed in her trials after launching, and since that time had never exceeded 14kn. To hit 17.5kn required 13408shp, so they managed to get 117% of designed power to the propellers, in a ship that had never exceeded 90% of designed power since her trials. It is really a good story of humans doing their absolute best to help others, and they absolutely saved many lives.
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Feb 21, 2019 20:56
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Sagebrush posted:It's awful loving writing that contradicts itself from sentence to sentence. It's possible to write a dramatic story without resorting to tabloid tumblr clickbait poo poo. counterpoint: it was fine
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Feb 21, 2019 20:57
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The Locator posted:117% of designed power You can't get more than 100% of designed power. You can get more than 100% of what the designers think the designed power is.  e: Of course the main thing isn't the design, it's what the actual ship-builders did contrary to the designs to make it all work, unless ship-building was very different back then.
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Feb 21, 2019 20:58
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 Headline: St. Louis Legend Rolls Stop Sign With 6 Mattresses and 2 Couches on Car Roof https://www.riverfronttimes.com/newsblog/2019/02/21/st-louis-legend-rolls-stop-sign-with-6-mattresses-and-2-couches-on-car-roof Moving trucks are expensive.
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Feb 21, 2019 21:00
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Sagebrush posted:I need you to understand that ships very much can exceed their rated top speed you exhausting ninny. It's not good for reliability but it is clearly possible, as evidenced by your own goddamned statement three sentences later. Moron It's quite true that the paper 'top speed' on ships isn't a hard number in the real world. The USS Yorktown (the one that still exists as a museum ship) has a published top speed of 27kn. That speed is with only 6 of 8 boilers online and not pushing any limits (and is probably intentionally understated because military). In the real world in an emergency and with lots of time for acceleration and all 8 boilers running, she could outrun her DD escorts unless it was only a short sprint (the DD's of the times would overheat their boilers if they tried to keep up for more than a few hours). I still think that what the crew managed with the Carpathia is pretty awesome, and they didn't have hours of time to prepare everything to be in perfect conditions for a max speed run. As far as I can find, there is no record as to whether there was any damage to her boilers or propulsion system, but given the short time period of 3 hours or so, it's pretty unlikely. Jerry Cotton posted:You can't get more than 100% of designed power. You can get more than 100% of what the designers think the designed power is. Designed power meaning simply the power number written down on the paper design. With a powerplant like Carpathia, you just put in more pressure than the designers intended, and you get more power. Of course that means running the boilers at higher pressures than intended, as well as the engine. Basically you are giving up safety margin as a trade off for more power. The Locator fucked around with this message at 21:05 on Feb 21, 2019 |
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Feb 21, 2019 21:02
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Captain Foo posted:counterpoint: it was fine negative. it's terrible glurge that was written by someone who'd watched too much star trek. it even ends suggesting that no one knows the story -- "the least we can do is remember them for it" -- when the crew were rightfully hailed as heroes when they arrived in new york and were given medals and poo poo and there are dozens of books and documentaries about the whole thing. i need you to understand that a steamship going faster than its rated speed isn't "breaking the laws of physics" and it's a stupid tumblrite thing to say. The Locator posted:I still think that what the crew managed with the Carpathia is pretty awesome, and they didn't have hours of time to prepare everything to be in perfect conditions for a max speed run. As far as I can find, there is no record as to whether there was any damage to her boilers or propulsion system, but given the short time period of 3 hours or so, it's pretty unlikely. of course it's awesome. i think what they did is amazing. i think that that particular version of the story was horribly written and sucked balls. Sagebrush fucked around with this message at 21:07 on Feb 21, 2019 |
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Feb 21, 2019 21:05
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Sagebrush posted:negative. it's terrible glurge that was written by someone who'd watched too much star trek. it even ends suggesting that no one knows the story -- "the least we can do is remember them for it" -- when the crew were rightfully hailed as heroes when they arrived in new york and were given medals and poo poo and there are dozens of books and documentaries about the whole thing. it's engaging writing and you're an out-of-touch curmudgeon e- and a lot less people know about the carpathia than the titanic and if this isn't obvious to you, lol
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Feb 21, 2019 21:07
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it's only engaging writing if you're a mouthbreather who's never read anything more advanced than harry potter. there's a line between "embellished for excitement" and "maudlin, saccharine drama" and this falls way off the far edge. for instance, did you know that ships can't exceed their top speed by even one knot? they can't do it. it can't be done. but carpathia did it! (USER WAS PUT ON PROBATION FOR THIS POST)
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Feb 21, 2019 21:09
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Jerry Cotton posted:You can't get more than 100% of designed power. You can get more than 100% of what the designers think the designed power is. NASA would like a word with you. Zipperelli. posted:This is easily one of the best videos I've seen on it. Pretty straightforward, and the guy's entire channel is really well researched and put together. Do recommend. I'm not done this yet but there's definitely some "misrepresenting what people said to score points" going on here. Like, when people say "the Titanic didn't have enough lifeboats", no-one means "it had less than the legal limit", which he spends a while refuting, they mean "it didn't have enough to carry everyone on board" which was undeniably true.
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Feb 21, 2019 21:13
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Sagebrush posted:it's only engaging writing if you're a mouthbreather who's never read anything more advanced than harry potter. there's a line between "embellished for excitement" and "maudlin, saccharine drama" and this falls way off the far edge. ugh, read a different book sagebrush
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Feb 21, 2019 21:14
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boats are dumb
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Feb 21, 2019 21:15
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Sagebrush posted:it's only engaging writing if you're a mouthbreather who's never read anything more advanced than harry potter. there's a line between "embellished for excitement" and "maudlin, saccharine drama" and this falls way off the far edge.  someone wrote something for an audience that wasn't me
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Feb 21, 2019 21:15
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Mozi posted:boats are dumb Submarines are where it's at, they're the space ships of the ocean https://www.youtube.com/watch?v=poiVqZJPVBo
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Feb 21, 2019 21:16
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jobson groeth posted:Submarines are where it's at, they're the space ships of the ocean here is a very well-written book about an ocean rescue involving submarines that i have enjoyed reading many times https://www.amazon.com/Terrible-Hours-Greatest-Submarine-History/dp/0060932775 it's a way better story than some 19 year old on tumblr's attempt to explain steam engines by analogy to the U.S.S. Enterprise (USER WAS PUT ON PROBATION FOR THIS POST)
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Feb 21, 2019 21:19
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ToxicFrog posted:I'm not done this yet but there's definitely some "misrepresenting what people said to score points" going on here. Like, when people say "the Titanic didn't have enough lifeboats", no-one means "it had less than the legal limit", which he spends a while refuting, they mean "it didn't have enough to carry everyone on board" which was undeniably true. Yeah, he goes back to the lifeboat thing at the end. Basically lifeboats by their very nature aren't intended to be used for long stretches of time. They're principal function is to ferry passengers from a sinking ship to the rescue ship, so having enough lifeboats at the time of Titanic for every passenger on board wasn't really given much consideration, if you consider the primary role of the lifeboat. Also notice, he never really refutes that lifeboat line, he's just trying to clear up the dumb poo poo people say that is incredibly lacking in nuance. I've watched a lot of these types of YT channels, and this guy at least appears to put some solid research into his videos. I think the best one he did was the moderates guide to gun control. Zipperelli. fucked around with this message at 21:41 on Feb 21, 2019 |
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Feb 21, 2019 21:37
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Jerry Cotton posted:You can't get more than 100% of designed power. You can get more than 100% of what the designers think the designed power is. Design power comes with a crapload of caveats that are understood to exist if you do any kind of engineering work. The biggest one for a steam turbine power plant is the safety margin. The boilers that make steam run at a design point temperature and pressure. This produces the design rated power, in a safe, economical way, and has basically no chance of damaging the plant equipment, employees or hull. If you decide to go full YOLO, you can increase the fuel flow into the boilers, and overspeed the blower fans feeding it air, and run the boilers at temperatures and pressures well beyond the safe limits. You get a shitload more power out of them, with the understanding that you're basically sitting next to a huge loving bomb, and if the boiler fails, it'll probably crack the loving ship in half or blow a huge rear end hole in the hull under the water line. It also helps that since the plant was designed to run for like 20+ years before needing a rebuild, everything is robust as gently caress, which means going completely balls out for 6 hours probably won't kill everyone, but it might shorten the life of the plant by years. Edit: Running a steam plant over design temp and pressure is basically the most OSHA thing you can do on a boat that doesn't involve water skis. Methylethylaldehyde fucked around with this message at 22:01 on Feb 21, 2019 |
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Feb 21, 2019 21:57
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the lifeboats at the time are also pretty lovely for use in a serious emergency, if the ship starts listing or settling into the water at weird angles. this was a problem with the lusitania, the ship sank so fast and so hard that they could only get a few lifeboats off despite the ship having extra lifeboats because of the titanic disaster six years earlier modern lifeboats are both easier to launch and board, assuming that in an emergency you are generally going to have less than ideal conditions to get people on them
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Feb 21, 2019 22:02
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Methylethylaldehyde posted:If you decide to go full YOLO, you can increase the fuel flow into the boilers, and overspeed the blower fans feeding it air, and run the boilers at temperatures and pressures well beyond the safe limits. You get a shitload more power out of them, with the understanding that you're basically sitting next to a huge loving bomb, and if the boiler fails, it'll probably crack the loving ship in half or blow a huge rear end hole in the hull under the water line. this was especially true in an era when every single system in the steam plant was essentially manually controlled you obviously couldn't do this kind of thing to a modern electronically-controlled diesel plant
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Feb 21, 2019 22:06
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sandoz posted:this was especially true in an era when every single system in the steam plant was essentially manually controlled Depending on the controls, you could probably defeat the redline rev limiter with enough swearing at it (can think of two or three ways, depending on how the controls are set up), but the prop will start to cavitate like mad and chew itself to death. Modern propellers are designed for peak efficiency, which means minimum wetted surface area, maximum screw delta-P, and long service life. If you run the prop faster, the delta-P across the screw goes up enough that the water boils along the trailing edges, which will chew shockingly huge pits into it in very short order. Again, it's something that will probably work fine for a day or two, but something that you categorically don't want to do if you can at all avoid it. Way less OSHA-y though, as the failure mode for that would be cylinder #5 blowing out of the casing and punching a hole in something, vs. the entire boiler going kablooie.
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Feb 21, 2019 22:16
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Re: submarine shenanigans, time to share my favorite submarine story. It's 1919, USS S-5 is in the Atlantic performing trials, including crash dives. The procedure for these dives calls for the main air intake valve to be left open until the last possible second before submerging. The senior enlisted man's job is to lever this valve shut just as the boat slips below the surface. Safe. Anyway, that guy is distracted by something, and water starts rushing in. He sees it, yanks down hard on the valve lever, and it sticks open. The crew manages to close most of the downstream valves to stop the water ingress, but they can't get the torpedo room valves closed, and it starts filling with water. The torpedo room is sealed off, but with it closed it can't be pumped out, and there's also an extra 80 tons of water in the bilges. The boat begins to sink, and eventually settles on the bottom under 55 m of water, far too deep to swim for it assuming they could have gotten out of the ship. They can't pump out the water. They're out there alone, and nobody knows they've sunk; rescue isn't coming. After some discussion a plan is hatched to rescue themselves. While they might be under 55 m of water, the submarine is 70 m long. They can't pump water out, but they can pump it forward. The hand tools they have will eventually cut through the hull. If they can get the stern up, and a hole cut, they'll at least be able to breathe, and maybe attract some attention from a passing ship.  quote:"What ship?" https://en.wikipedia.org/wiki/USS_S-5_(SS-110) PittTheElder fucked around with this message at 23:37 on Feb 21, 2019 |
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Feb 21, 2019 22:19
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Yes, it's like a lava lamp.
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Zipperelli. posted:People always love exaggerating the Titanic disaster for some odd reason.
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Feb 21, 2019 22:27
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