[HN Gopher] Animated Engines ___________________________________________________________________ Animated Engines Author : marcodiego Score : 378 points Date : 2021-03-06 17:29 UTC (5 hours ago) (HTM) web link (animatedengines.com) (TXT) w3m dump (animatedengines.com) | prashnts wrote: | Quite interesting! Reminds me of http://507movements.com/ | | Edit: It's linked in the website as a "sister site". | cstross wrote: | Needs more Napier Deltic: | | https://en.wikipedia.org/wiki/Napier_Deltic | | (It's a two-stroke cycle diesel but not as we know it -- three | cylinders arranged in a triangle with a crankshaft at each | vertex, one of them counter-rotating relative to the other two, | and _six_ pistons, two of them opposed in each cylinder! There is | an animation on the wikipedia page. Tracking it will make your | head hurt. This thing was a mainstay of the British railway | industry in the late 1950s to 1960s ...) | ggm wrote: | Absolutely amazing engine noise, you couldn't mistake it | pulling out of Waverley station in Edinburgh. As a trainspotter | I stood on the platform and saw all 22 over the years. I | believe the tested engine used to be in the science museum in | London but is now in the York museum. | | The baby deltic was a more prosaic workhorse, the deltics | delivered the 100mph Edinburgh London service for decades. | jacquesm wrote: | That's a pretty clever design, thank you for posting this, I | never even heard of it before. I really like the opposing | piston trick to get rid of the heavy head, but it does make you | wonder how they dealt with the spot where the fuel has to be | injected, it's hard enough to get reasonably efficient | combustion when you're injecting into the center of the cavity. | Did it use multiple injectors per cylinder? | rleigh wrote: | This part is dead simple and quite clever. It's on the | animated diagram in dark blue, and you can also see one port | on the cutaway engine block photo (I've been to see this in | real life; the engineering is phenomenal). On the blue | diagram I think it's air+fuel at one end and exhaust at the | other. | | When the pistons reach their maximum opposing distance, the | injection and exhaust ports are briefly exposed, allowing for | entry of fuel/air and exit of exhaust in a single linear | movement from one end of the cylinder to the other. Maybe the | air is injected before the fuel or at a higher pressure. And | if you time the speed of the exchange just right in time for | the exhaust ports to be closed over before the compression | stroke, you get complete exchange with no fuel wastage. | Absolutely nothing like a 4-stroke engine, and not much like | common 2-stroke designs either. | Judgmentality wrote: | This is neat. If someone wants a slightly more comedic take on | automotive engine designs, Donut Media has some interesting | content. | | https://www.youtube.com/watch?v=8YIDOjD0oBI | | EDIT: Removed erroneous claim. | berniemadoff69 wrote: | > If someone wants a slightly more comedic take | | it seems sort of rare on the Internet, particularly in videos, | for someone to NOT be doing a 'comedic' take, along with a jump | cut every 5 seconds, background music; all kinds of stuff that | feels like it is desperately trying to do everything it can all | at once to make someone not hit the back button. ironically, | hitting the back button is the first thing i do when a video | starts with 'Wats up Guyz' or something along those lines. the | original post is a breath of fresh air, straight to the point. | I wish the Internet was more like this in general. | marcodiego wrote: | These "jump cut every 5 seconds" is the reason I've been | watching less youtube everyday. It completely breaks | continuity and are so frequent that a significant part of the | video is wasted. | | Reading and watching an animation is better than video | tutorials in almost every regard. | capableweb wrote: | > Donut Media pioneered the "suck squeeze bang blow" descriptor | of the 4 stroke engine | | Someone please correct me if I'm wrong but I think I've heard | the term "suck squeeze bang blow" way before Feb 23, 2021 and | also before 2015 (creation of that Youtube channel) so I find | that claim hard to believe. | pen2l wrote: | This text dated 1981 mentions it (page viii): https://link.sp | ringer.com/content/pdf/bfm%3A978-1-349-06976-... | | edit: and googling some more, there are instances of in being | used it 1950s. And the likely first author of the saying | might well be the inventor of the 4 stroke engine himself, | Nicolaus Otto, who used a similar saying to describe it: | _Saugen, Drucken, Knall, Schlag._ | wizzwizz4 wrote: | Only source I can find for your last claim is | https://mechanics.stackexchange.com/a/28690/33924: | | > Actually, I wouldn't be surprised if the great Nikolaus | August Otto, inventor of the four-cycle engine had a | similar saying to explain his engine: _Saugen, Drucken, | Knall, Schlag_... | | So I think this is apocryphal. | pen2l wrote: | You might be right, I'm not sure. At least in Otto's | patent filing (which is found in English here: https://pa | tentimages.storage.googleapis.com/1f/3f/4c/821c6da... ) I | don't see such an expression. | | I do see though that the breakdown of the Otto cycle on | most sites including German ones | (https://de.wikipedia.org/wiki/Ottomotor) is usually made | in a way that just sorts of lends itself to being | transformed that way. | | Well, thanks for making me go through his writings, this | was fun! | cableclasper wrote: | Yeah. I've seen it in an old BBC documentary: The secret life | of machines - Internal Combustion Engine | https://www.youtube.com/watch?v=gfr3_AwuO9Y | NikolaeVarius wrote: | Wow screw this channel for such dumb shit. | bagels wrote: | It predates that channel by decades. | Judgmentality wrote: | Sorry, it's just the first place I'd heard it. I'll edit my | comment. I wasn't speaking on behalf of them. | | Weird. I've been talking to people about cars for decades and | I'd never heard it before them. Is it just something that | people don't say anymore? | | https://mechanics.stackexchange.com/questions/28682/who- | came... | | I guess for whatever reason it's just not used as much, or at | least not enough that I've heard it before. | spike021 wrote: | Something to keep in mind: several sources of actual topics | have contradicted Donut Media views on certain things and DM | has been known to steal video clips without crediting where | they got them or use Wikipedia articles as established sources. | | Not that all their videos have these issues, but some do and it | gets pretty ridiculous. | varenc wrote: | I love this site! It reminds me on the "early" internet. | Dedication to a niche interest without any other fluff. | [deleted] | jacquesm wrote: | Exactly my choice of words :) But you beat me to it by an hour | or so, have an upvote. | tim333 wrote: | Cool though their turbofan isn't going to work very well with the | compressor being much larger than the turbine - the gas would | find it easier to flow the wrong way. The Wikipedia animation has | more promising dimensions https://en.wikipedia.org/wiki/Turbofan | mrfusion wrote: | This has baffled me since I was two years old. The burning fuel | should push in all directions equally. What makes it go more | out the back than the front? | zxczxczxcf wrote: | After remarking on how boring jet engines are, the page gets | vague and states that the turbofan increases "fuel efficiency", | without explaining why or how. I've seen it assumed elsewhere | that the efficiency of turbofans is due to thermodynamic | effects. In this case, what the author wrote is vague about the | mechanics of it, at best. | | In fact, turbofans have better _propulsive_ efficiency because | they accelerate more air to a lower speed. Fuel efficiency | follows from that. | https://en.wikipedia.org/wiki/Propulsive_efficiency#Jet_engi... | amelius wrote: | How do you drive the fuel into the highly compressed chamber, in | case of the Diesel engine? | jcampbell1 wrote: | Until very recently, the injector works by a push rod from the | cam shaft, meaning it is powered the same way the valves are. | | In modern engines you have other options such as an electric | piezo stack hammer to force the fuel. | SigmundA wrote: | You might be conflating how an injector turns on and if with | how the fuel is pressurized. Unit injectors create the high | pressure for injection in the injector, combining the high | pressure pump and injector in one, fed by a low pressure | rail. Theses are driven mechanically via cams to create | pressure. | | Common high pressure rail injectors have a separate high | pressure pump connected to engine elsewhere and the injectors | just turn on and off fed by a high pressure common rail. | | The injector itself can be actuated mechanically or via | solenoids or piezo, but there are no injectors that create | pressure electrically that I know of (the closest I have seen | are voicemail medium pressure gas injectors used in ETEC | engines). That is the electric part of the injector only lets | the fuel through, it does not force it. | dugditches wrote: | via a 'fuel/injector pump'. Can click through this to get an | idea of just how complicated(and analog) they are. | https://www.youtube.com/watch?v=DKZL7Y0b5-U | cityofdelusion wrote: | The fuel injectors operate at very high pressures (200+ | megapascals). Interestingly, it makes working on these systems | dangerous since the atomized fuel can inject and slice through | human tissue. | capableweb wrote: | The diesel engine is found here for the record: | http://animatedengines.com/diesel.html | | Short answer: you need a fuel injector that can handle | injection into the highly-compressed air. Longer answer: | https://www.britannica.com/technology/diesel-engine/Fuel-inj... | jacquesm wrote: | The 'oldfashioned' way was using a high pressure fuel pump, | basically a needle sized piston pushing a tiny little bit of | fuel into a high pressure metal fuel line, the springloaded | ballbearing return valve at the tip of the injector would be | pushed open by the fuel and then the fuel could stream past the | ballbearing to the injector nozzle. | mcguire wrote: | Adding to the "if you like this" chain, the vbbsmyt YouTube | channel has 3d animations of historic guns and other weapons. | | https://www.youtube.com/channel/UCFOZwUakpRbIH2zisiRU0Dw | eigenvalue wrote: | I really love the content here but it looks so pixelated on my | high-dpi monitor. It would be awesome is someone remade something | like this but using modern web technologies (maybe Lottie from | Airbnb) that uses vectorized images that can scale to any size. | mrfusion wrote: | If we ever had a high altitude electric plane do we think | electric motors with huge props? Or would we try to recreate the | turbo jet? Maybe resistive heating elements instead of fuel? | mberning wrote: | It would most likely emulate a turbofan, replacing the core | with an electric motor and possibly a gearbox. | dang wrote: | If curious, past threads: | | _Animated Engines_ - | https://news.ycombinator.com/item?id=7127953 - Jan 2014 (34 | comments) | | _Animated Engines_ - https://news.ycombinator.com/item?id=701186 | - July 2009 (11 comments) | TimBurr wrote: | If you like this, you'll probably enjoy Elmer's Engines. It's an | old book full of steam engine plans, designed for people who are | new to machining. | | I used some of them as blueprints when I took drafting in high | school. | | http://www.john-tom.com/html/ElmersEngines.html | jonplackett wrote: | It would be cool to see some Heath Robinson contraptions animated | like this! | carapace wrote: | No Tesla turbine? I guess it would be too boring. | | (I know it's bad form to explain a joke, but I'm going to anyway. | The Tesla turbine used to be legendary (as in "urban legend") | before the Internet. Anyway, it has only one moving part which is | radially symmetrical and rotates about its center so there would | be nothing to see in the animation!) | Vektorweg wrote: | These are pretty cool. | | Worth to spend some time turning these into continuous SVG. | elwell wrote: | When I stare at these animations I can almost hear sounds. | marcodiego wrote: | Possibly related effect:https://www.cambridgebrainsciences.com/ | more/articles/why-mos... | elihu wrote: | Probably worth mentioning LiquidPiston's new rotary engine design | (which has been discussed on HN before): | | https://www.liquidpiston.com/how-it-works | | (It's like an inside-out Wankel engine. Instead of a triangular | rotor in an oval housing, it's an oval rotor in a triangular | housing. The advantage is you get a more optimally-shaped | combustion chamber, which ought to improve fuel economy and | emissions. Also the apex seal-equivalents are easier to lubricate | as they're attached to the housing rather than the rotor. They've | made a few prototypes and they're working on durability.) | mberning wrote: | Interesting twist on a Wankel style design. It looks like the | apex seals are moved to the block rather than rotor. I'm also | curious as to the benefit/drawback of having the flow of intake | and exhaust perpendicular to the rotor. | jacquesm wrote: | I love websites like these. No fluff, just good quality content. ___________________________________________________________________ (page generated 2021-03-06 23:00 UTC)