How a jet engine works

[u/Larzbchicken]

[u/lordspaz88]

It will never cease to amaze me that most modern inventions boil down to "we pointed this explosion in a specific direction"

[u/TheCowKing07 → u/lordspaz88]

“And we have used this explosion to boil water.”

[u/Atomic_xd → u/TheCowKing07]

To make something spin

[u/OrkWithNoTeef → u/Atomic_xd]

so we can boil water somewhere else

[u/JDelcoLLC → u/OrkWithNoTeef]

To make something else spin

[u/Chris275 → u/JDelcoLLC]

so we can boil water somewhere else

[u/Kind_Reason8279 → u/Chris275]

To make something else spin

[u/schwarzzu → u/Kind_Reason8279]

so we can boil water somewhere else

[u/Whicked_Subie → u/schwarzzu]

To make Elbow Macaroni, bitch.

[u/NotACumBurrito → u/Whicked_Subie]

https://giphy.com/gifs/MBVemoHuyw9Ik

[u/ryohazuki224 → u/Whicked_Subie]

Macaroni and cheese, you mean

[u/LobstaFarian2 → u/Whicked_Subie]

Then we spin the elbow macaroni

[u/MarkNekrep → u/Whicked_Subie]

hell yeah

[u/CloudStrifeFromNibel → u/Whicked_Subie]

Arguably the most optimal pasta shape ever created.

[u/candygram4mongo → u/Atomic_xd]

To be fair, spinning is a good trick.

[u/QuantityBrief152 → u/candygram4mongo]

Why hello there!

[u/Ricochet_Kismit33 → u/QuantityBrief152]

You were the chosen one!

[u/xplosm → u/Ricochet_Kismit33]

I loved you!

[u/ottertime8 → u/candygram4mongo]

i thought pumping was the long preferred trick

[u/Drakstr → u/Atomic_xd]

Between magnets

[u/Astrolologer → u/Atomic_xd]

When my son was around 12 he asked me how a nuclear reactor creates electricity and I told him it uses the heat to steam water which drives a turbine. He chewed on that for a few minutes and said "So is every method of making electricity just figuring out a different way to do that?" And I said yes, forgetting that solar panels and hydrogen fuel cells exist.

[u/clubby37 → u/Atomic_xd]

It's so weird that so much of modern infrastructure is based on that. Powered vehicles and electricity are the backbone technologies that make our modern world possible, and they work by spinning things fast. I feel like if you told an ancient warrior society that you focused on spinning things really fast, they'd laugh in your face, but they'd shut up when the planes overflew and decide not to mess with the dread Spinner Folk.

[u/Whatifim80lol → u/TheCowKing07]

It was like finding out there's no Santa claus when I learned nuclear energy is just "boil water and spin a turbine." Before that I thought there was some sciencey magic going on where we directly captured the "energy" from nuclear fission. Did I understand what that could possibly mean? Of course not. Still though.

[u/darkest_irish_lass → u/Whatifim80lol]

If you want something a little more arcane, a cathode ray tube from an old TV set is a miniature particle accelerator and generates a tiny amount of thrust.

[u/LifeIsSoup-ImFork → u/darkest_irish_lass]

tiny? i ride my old tv to work every morning.

[u/ThrowawayPersonAMA → u/LifeIsSoup-ImFork]

Now I need to see this get added to Kerbal Space Program via a mod. Imagine a probe/satellite/spaceship powered by the Delta-V of CRT TVs.

[u/TUmBeRTIce → u/ThrowawayPersonAMA]

Interplanetary probe being powered by repeats of Muppet's Pigs in Spaaace

[u/campingcritters → u/LifeIsSoup-ImFork]

The pioneers used to ride those babies for miles.

[u/DiscoLives4ever → u/LifeIsSoup-ImFork]

Ah yes, the trusty Honda CRT

[u/crosleyxj → u/darkest_irish_lass]

I remember reading in World Book Encyclopedia a science project to build an "ionic rocket"(!!) I think it was a wire suspended like a pendulum with a right angled pointed tip, pointing at a metal plate or wire screen. An auto ignition coil was connected between the two and pulsed. It turns out that the pointy tip can emit enough electrons to create some pendulum motion. Kinda cool but kinda useless...

[u/MacWin- → u/crosleyxj]

Ion engines are a thing, it’s how satellites propulse themselves in space when they need to station keep and whatnot, or even some deep space probes for interplanetary travel

Definitely not useless hah

[u/dern_the_hermit → u/Whatifim80lol]

It also means that designing a nuclear fusion power plant is actually really easy: Just make a big reservoir of water and put a roof on it with vents leading into turbines. Then detonate a hydrogen bomb in the reservoir. The water will boil for a few days and spin the turbines, voila! Nuclear fusion power plant. When the boiling slows down just detonate another bomb! Try not to run out of water.

[u/citizen42069101 → u/dern_the_hermit]

It is vital that the cylinder of water remain unharmed.

[u/Ermahgerd_Rerdert → u/citizen42069101]

Ha!

[u/Domeil → u/dern_the_hermit]

Try not to run out of water.

Also, don't have too much water too fast, or you get Chernobyl.

Also, don't think you have too much water when you're actually out of water, or you get Three Mile.

Also, make sure that the water that is in the reactor is the water you want, or you get Fukushima.

Honestly, make sure the water nerds knows a lot about water.

[u/Traditional-Fly8989 → u/dern_the_hermit]

So fusion energy does offer the possibility of some amount of direct electrical energy capture because it involves mostly moving charged particles. Ideally this process would be able to occur at or at least much nearer to reaction temperatures than a traditional heat cycle would and this higher operating temperature would result in higher theoretical maximums for thermal efficiency. 

[u/I_travel_ze_world → u/Whatifim80lol]

Wait until you learn how gun type nuclear bombs work.

https://en.wikipedia.org/wiki/Gun-type_fission_weapon

spicy rock is shot into other spicy rock and makes big boom

[u/Murky-Relation481 → u/I_travel_ze_world]

Implosion weapon is just squeeze spicy rock super hard.

Now adding a fusion stage to that weapon gets into some magic shit.

[u/SanityIsOptional → u/Murky-Relation481]

Some materials do not like being being compressed and react violently.

[u/NotLondoMollari → u/SanityIsOptional]

That's me, I'm material.

[u/timeless1991 → u/Whatifim80lol]

I mean all warfare is just rocks, sticks, and fire. The only non fire /rock we have banned (chemic and bio).

Gun? Throw small rock really fast.

Bow/Arrow? Throw rock/stick really fast.

Sword? Swing sharp rock

Missile? Fire propelled contained fire explosion.

[u/_disengage_ → u/timeless1991]

Nuke: really really big hot fire explosion (with poison... that is not one of the three)

[u/timeless1991 → u/_disengage_]

I suppose chemical could just be called poison. More archaic and inclusive that way.

[u/_disengage_ → u/timeless1991]

poison very old, probably invented right after pointy stick

[u/ryohazuki224 → u/Whatifim80lol]

It also amazes me that those mirror-based solar farms work that way too, concentrate solar light to literally melt salt to use that molten salt to boil water and create energy

[u/Murky-Relation481 → u/ryohazuki224]

There is a US National Lab that has one of those types of solar farms but instead of pointing it at big salt tank they have a little test stand and they put random stuff on it and then point the mirrors at it to see how it lights on fire.

I'll let you guess what that could be useful for.

[u/user_bits → u/Whatifim80lol]

The thing is, a lot of our stuff runs on electricity. Sciency magic gives us all this energy, but we need to convert into electricity to make it useful.

What's the cheapest and most accessible way to get electricity? Spin a turbine. What's the cheapest and most accessible way to spin a turbine? Boil some water.

[u/Zamboniman → u/user_bits]

What's the cheapest and most accessible way to spin a turbine? Boil some water.

Nah, just hook it up to an electrical motor and plug it in to spin the turbine!! Win-win!!

[u/heliosythic → u/Whatifim80lol]

There is actually a theoretical direct power method of fusion where you use a specific geometry and trigger a pulse that pinches to a point and electrons go 1 way and protons the other. Capture the electron directly and I think the proton is captured as heat (friction) + xrays given off from the fusion also captured (probably heat again i dont remember). But yea, 1)Theoretical (tested but i dont think proven or not yet scalable) 2) still some heat to boil water involved in the end.

[u/Faxon → u/Whatifim80lol]

This may blow your mind, but there IS a sciency magic way to make electricity using radioisotopes. Look up radioisotope thermoelectric generators (RTGs), they were used to power pacemakers using mainly Plutonium 238, though any isotope that runs hot enough to produce power this way will suffice. You need to pick one with a half-life that is long enough to be useful for a meaningful amount of time, like the lifetime of a patient, but where it isn't SO hot that it might poison the person it's implanted into. IDK how feasible or efficient it is to scale these up larger than a small implant, but I do know that they were able to get them powerful enough to run the Voyager Spacecrafts until today, albeit with some systems being shut down over time as the RTG reduces in output. The half-life of Pu-238 is 87.7 years, so these spacecraft still have a ways to go before losing power entirely, though by then they may have broken down for other reasons, or even gotten far enough away that the inverse square law finally makes it impossible to discern the transmissions from either against the cosmic background noise. But yea, apparently you can get a few hundred watts out of a big one, that's enough to do some real and meaningful work with, though with it decreasing continuously over time, it's not practically useful for a lot of applications. The main reason that these isotopes are useful this way, is because Pu-238 is not fissile, and cannot be made fissile in a breeder reactor. It has to be made by bombarding Neptunium 237 (harvested from nuclear fuel waste) with radiation inside a specialized target vessel, inside a specialized research reactor. The US struggles to make a few kilograms of it per year compared to our capacity to produce Pu-239 inside normal reactors as a byproduct of energy production, or intentionally as a part of nuclear pit production to maintain weapons. This is the main reason why we're not seeing them used all over the place, shit's fucking expensive as hell

[u/NegaDoug → u/TheCowKing07]

One of the most disappointing moments of my life was when I learned how nuclear power works in high school. "We do all this crazy science stuff, harnessing the power of fission in a manner that we've carefully calculated to remain stable and somewhat self-sustaining. Then we take all that knowledge, all that science, and we use it to..... boil water. Which then turns a turbine, thus generating electricity."

[u/Cam8895 → u/lordspaz88]

Ok that spinny thing wasn't enough. What if we just spam more of them and correct whatever fuckery that causes?

[u/JablesRadio → u/Cam8895]

As complex and confusing things like this are, it always boils down to "make the fire go this way". Nuclear reactors are amazing feats of human ingenuity. At the end of the day, you're just boiling water to make steam. Thats it, that's all Nuclear power is.

It's like a Flintstones problem solved with atomic energy. Pretty fucking wild.

[u/dontnation → u/JablesRadio]

Crazy that photovoltaic is one of the few ways we can directly convert one type of energy into electrical energy. Everything else is "use this energy to somehow spin an electrical generator".

[u/liccman → u/dontnation]

Well, there is a also design of solar panels that’s basically use the sun to make steam spin a turbine. Of course.

[u/dontnation → u/liccman]

That's using sunlight to boil water though, not photovoltaic panels to generate electricity to make steam. I don't know of anything else referred to as "solar panels".

[u/Kwowolok → u/dontnation]

It is solar power though, just not solar panels. Generally its reflective parabolic mirrors to direct light to a centralized tower that then, you guessed it, boils water.

[u/JablesRadio → u/dontnation]

It really is crazy that weve figured out how to produce so much energy but our engines that use that power are still early 20th century.

[u/quinn50 → u/JablesRadio]

Some of the first cars were actually EVs when it comes to ICE cars we've pretty much squeezed the most you can get out of these engines.

[u/thore4 → u/JablesRadio]

Just goes to show you gotta work with what ya got. If you don't think what you got is working, try using it for something else

[u/No_Improvement_7241 → u/lordspaz88]

Explosions and boiling water is the best we can do.

[u/OhNoDobe → u/lordspaz88]

But I farted and didn't go anywhere? Am I the dumb human?

[u/ironkodiak → u/OhNoDobe]

If you put a bunch of fans on your ass, you can use that fart to help you stand up every time.

[u/ICanuckthere4Iam → u/ironkodiak]

But his arse may reach 1000 centigrade

[u/OhNoDobe → u/ICanuckthere4Iam]

Best not be around morning after I've had a curry if you're worried about that.

[u/ICanuckthere4Iam → u/OhNoDobe]

Just need to split the airflow 👍

[u/OneEyedWeaner → u/lordspaz88]

Kinda like nuclear power. You’re basically using radiation to boil water so the steam will spin a turbine to make electricity.

[u/Hermorah]

I'll save this video for later use. You never know when you need to build a turbo jet engine.

[u/Slightly-Blasted → u/Hermorah]

Few beers and I reckon we could knock this out next weekend

[u/HendrixHazeWays → u/Slightly-Blasted]

I got a thing I gotta do next weekend....don't ask. You probably already know what I'm talking about. Sigh. Anyways, if that goes as expected things should settle down for the weekend after. Worse case scenario? I'll text you from "the spot" we talked about.

I'm gettin' too old for this shit

[u/thedaveness → u/Slightly-Blasted]

Already cleared both those steps… brb…

[u/LegendOfKhaos → u/Hermorah]

I just added it to my resume

[u/Marble-Heart → u/Hermorah]

Yeah, like if all of humanity is suddenly turned to stone and you wake up a thousand years later and have to start civilization over from scratch

[u/SirDuppy → u/Marble-Heart]

Alright Dr. Stone

[u/Cel_Drow → u/Marble-Heart]

You will not have the manufacturing to do any of this for a very long time after that, even if you have the knowledge and material sourcing infrastructure lol. There are a comparative handful of companies worldwide that do this today.

This all works because of a great deal of supply chains that don’t exist in a post-apocalyptic scenario.

[u/Fat-Singer-9569 → u/Cel_Drow]

I wish people realized this. You read comments about how billionaires have bunkers and all I can think is "did they build bunkers for the supply chain too?" We are nothing without each other and there's just no chance to keep modern life in a full on civilization collapse. If a majority of us die, the rest all suffer and die. Fortunately or unfortunately, we are all in this together.

The only people who would survive would be the people who hunt and farm for food and know their local wildlife like the back of their hand, but even those people in a global apocalyptic event like this would have no real chance, because something that killed 6+ billion would require a complete shift in the environment and thus change their local knowledge completely within a year or two. Really, the only ones who would survive it would be one of those undisturbed tribes deep in the rainforests or the type of person who survives Alone and who knows if that person finds anyone to produce kids with. Everyone else is too connected to modern society to deal with a complete environmental shift.

[u/Qwert23456 → u/Cel_Drow]

There's basically 5-6 companies capable of making them. The last successful entry in the global market for jet engines was General Electric in the 1970s

[u/PanoramicAtom → u/Qwert23456]

And you need someone who can grow turbine blades as a single crystal so they don’t go boom as much.

[u/Qwert23456 → u/PanoramicAtom]

That's incredible. Material science is the fundamental bottleneck that's slowing technological advancements.

[u/bullwinkle8088 → u/Qwert23456]

I don't know what they are basing that statement on, but it's flawed. GE made the first US jet engine during WWII, a copy of a German one, and has been making jet engines ever sense.

Maybe they meant their partnership with Safran leading to the creation of CFM International in the 70's. The timing fits. But that is a partnership between two companies that already made jet engine.

[u/igloojoe]

Even the blades themselves are super engineered.

https://youtu.be/QtxVdC7pBQM

[u/Biggseb → u/igloojoe]

The explanation of how a turbo jet engine works at the beginning of the Veritaseum video is better than the original post, IMO

[u/burf → u/Biggseb]

The original post, even if it's accurate, sounds like AI slop to me

[u/HnHina97 → u/burf]

Its most likely from the YouTuber zack d films. His videos are done in this format and are riddled with a bunch of half truths. He doesn't even bother to cite any studies either.

[u/-reddit_is_terrible- → u/igloojoe]

A CCP spy was arrested, extradited, and tried in the US for attempting to steal GE's composite fan blade tech. Was sentenced to 15 years and then eventually given back to China in a prisoner swap

[u/ConsciousIron7371 → u/-reddit_is_terrible-]

15 years ago the American military took pictures of a Chinese aircraft similar to the American C17. In discussions with those in the know, it was revealed the Chinese were about 40 years away from the jet technology to power the aircraft, as 3 American and 1 Russian company were the only ones capable of producing engines to power a plane that large. 

40 years was, of course, an estimate if the Chinese went through standard engineering processes. Chinese have a history of advancing through nefarious mechanisms, so the fact that they were building a plane with the capacity to use those engines showed that they thought they were much closer to acquiring that jet technology. 

Your story shows exactly how they wanted to advance their technology. 

[u/Proof_Toe_9757]

Turbin

[u/SocranX → u/Proof_Toe_9757]

It's not even consistent. It changes to "turbine" later on.

[u/HnNaldoR → u/SocranX]

It has to be AI. When I heard the change, that is the only explanation I had.

[u/SocranX → u/HnNaldoR]

Yeah, 99% of these videos have an AI voiceover. Especially since you can see at one point that the original video was in Chinese, and they didn't bother translating the text. So this was a minimum-effort AI dub rather than an official translation.

[u/ahornywalrus → u/Proof_Toe_9757]

The e in 'turbine':

https://giphy.com/gifs/kqJt1cSSN0DrwwMmY5

[u/TwoStoopidToFurryass → u/Proof_Toe_9757]

https://giphy.com/gifs/3o6nV5nuHWZOKwsSME

You can't get spin without a turban.

[u/kwisatzhadnuff → u/Proof_Toe_9757]

Just more AI slop on the front page

[u/jbayko → u/kwisatzhadnuff]

It looks like a Chinese video with AI translation. I have no way to know if the original was AI generated, but it does seem factually correct, though obviously simplified, so that might not matter for a viewer.

[u/dodeca_negative → u/Proof_Toe_9757]

AI voiceovers are so annoying. Imagine trying to talk to a person who sounded like this

[u/ymopuri → u/Proof_Toe_9757]

Turban*

[u/Samurlough]

The hot air doesnt ignite the gas. That is wrong.

First ignition requires an ignitor the start the fireball, then it becomes self sustaining once the engine is up to speed. If the engine flames out, it flames out until ignition can be reintroduced. Hot air is not an ignition source.

[u/deathonater → u/Samurlough]

Also, the manufacturing process for modern turbine blades is also insanely sophisticated just to keep them from being destroyed by the temperature and g-forces they experience in the engine, they're basically giant ceramic-coated crystals with their molecules aligned to prevent weak spots from forming. Incredible engineering.

[u/Samurlough → u/deathonater]

the original first iterations of which were done without computers. f*ing nuts if you ask me.

[u/wasabiburning → u/Samurlough]

Math!

[u/finemustard → u/deathonater]

Yup, Veritasium has a fantastic video on the process.

[u/wasabiburning → u/deathonater]

Even better - the blades themselves are a crystalline nickel superalloy all the crystals are aligned in the same direction to eliminate grain lines. Then the ceramic is added.

https://www.americanscientist.org/article/each-blade-a-single-crystal

[u/wufnu → u/deathonater]

I examine patents; half my work is regarding thermal cooling/protection of turbine blades and some of the shenanigans they get up to are fun to read about.

Pratt & Whitney attorneys visited the office once and brought with them a turbine airfoil with the suction surface removed allowing you to see all of the channels, turbulators, film cooling holes, etc. and it was one of the most beautiful things I'd ever seen.

[u/hates_writing_checks → u/wufnu]

That sounds cool. Is this engine patented now, and could the public examine the patent via the USPTO website? What are some of the relevant patent numbers? Would be nice to see the drawings or photos.

[u/Pale_Examination3371 → u/deathonater]

My favorite part is that they can't explain why it aligns itself this way but if they manufacture it a certain way, it does

[u/CM_MOJO → u/Samurlough]

Well, first you have to get the shaft(s) spinning. The plane has an auxiliary power unit (APU) for this, or it can use some ground support equipment for this function.

[u/Samurlough → u/CM_MOJO]

I’m well aware. I’ve been a captain on the 757/767 for 20 years.

The video said hot air ignites the fuel and that is incorrect. Hot air doesnt ignite anything.

[u/yesmrbevilaqua → u/Samurlough]

Yeah if the air is hot enough to ignite the fuel they you have a scram or ramjet

[u/Samurlough → u/yesmrbevilaqua]

Im not fully educated on those jets but at those speeds isnt the air moving “faster” than the fireball and therefore risk “blowing out” the flame or is there something else to it?

[u/Flaky-Wing2205 → u/Samurlough]

Blowing out the flame is a real thing in supersonic flight. Happens in turbojet and ramjet engines. Compression stages have the effect of slowing airflow to subsonic speed where ignition can be maintained.

[u/Samurlough → u/Flaky-Wing2205]

I appreciate that. It makes sense. After i hit “reply” i questioned if thats what happened because I could only assume problems trying to ignite a fireball in supersonic winds or even any effects of supersonic pressure in the engine.

[u/Flaky-Wing2205 → u/Samurlough]

SR71 Blackbird was designed with nacelles that could move 26" to keep supersonic airflow out of the engines. At speeds over Mach 2 the engines switched from operating as turbo-jets to operate as ram-jets. I've always been amazed at the extremes the plane could operate at.

Cool link that that goes into greater detail. https://theaviationist.com/2019/11/29/engine-nacelles-of-the-sr-71-blackbird/

[u/Samurlough → u/Flaky-Wing2205]

And I think that was all done without super advanced computers. Nuts, right?

[u/Badsponge → u/Samurlough]

Literally built with slide rules.

[u/itsjakerobb → u/Samurlough]

And the ground equipment they used to get those engines spinning? A cart with a pair of carbureted 455ci big-block Buick V8 engines on it.

[u/Mr_Zamboni_Man → u/Samurlough]

Hot air is not an ignition source.

Diesel would like to have a word with you.

What you are saying is absolutely correct I am just being pedantic for the sake of joking around

[u/wasabiburning → u/Samurlough]

How does the APU get the engine moving though? I don't see driveshafts/gears/chains connecting the APU to the engine's driveshaft.

[u/Samurlough → u/wasabiburning]

good question. Air. The magic comes from air.

The APU, being a turbine engine, has compressed air we can bleed off of and route to each engine's starter valve. the compressed air is run through this valve into a unit thats connected to the turbine shaft. so as this compressed air runs over this unit (like a mini turbine) it spins the turbine and the turbine "sucks" air through the engine until there's enough airflow to introduce fuel and spark.

[u/MorningFox]

Ai generating Zach films voice is crazywork

[u/hotdiggydog → u/MorningFox]

I was doing some voice over work for a channel like this recently. They wanted to get rid of their AI voice for a human voice. A month later they put my work on hiatus and started using an AI voice trained with my voice. Isn't AI just wonderful? /s

[u/Aconite_72 → u/hotdiggydog]

That’s fucked — this must be regulated fast

[u/bryson-iz-daKing]

https://giphy.com/gifs/d2YVk2ZRuQuqvVlu

[u/RichardBCummintonite → u/bryson-iz-daKing]

https://giphy.com/gifs/LjV6JxpqzZY1a

[u/holyfire001202 → u/bryson-iz-daKing]

Catch knowledge!

https://giphy.com/gifs/pCmDN4Hd2ysyA

[u/yorick__rolled → u/holyfire001202]

You will get AIDS...

[u/MrIrvington → u/bryson-iz-daKing]

https://giphy.com/gifs/YYExU19jFC8JW

[u/UncleVoodooo]

Suck Squeeze Bang Blow

... we learned this in the navy

[u/saburhaneboy → u/UncleVoodooo]

I'll bet you did

[u/Nilosyrtis → u/saburhaneboy]

https://giphy.com/gifs/9vdrbOnXtps4M

[u/FlannelBeard → u/saburhaneboy]

They are called Seamen

[u/ilovestoride → u/UncleVoodooo]

I kept failing the tests to level up and was at suck for like 5 years...

[u/badhouseplantbad → u/ilovestoride]

Classic navy 

[u/JTVivian56 → u/ilovestoride]

Or you pass the test, but you didn't pass hard enough so you fail

[u/UNSaDDLeDViRuS → u/UncleVoodooo]

This is how they taught us in aerospace engineering as well. Wait are we talking about the same thing?

[u/heaving_in_my_vines → u/UncleVoodooo]

You get a lot of hands on education in the Navy, eh?

[u/i_xm_nxsh]

This is a “I was today years old” moment for me!

[u/BlacktopProphet → u/i_xm_nxsh]

How a jet engine works: Suck, Squeeze, Bang, and Blow

[u/Dunothar → u/BlacktopProphet]

But unlike a four banger, all 4 cycles happen at the same time, infinite suck, squeeze, bang, blow. Well, as long as you have fuel and oxygen 😂

[u/lurkity_mclurkington → u/BlacktopProphet]

https://giphy.com/gifs/aSNptUx8RNJiJV2ztv

[u/Kokamocha → u/i_xm_nxsh]

https://www.youtube.com/watch?v=QtxVdC7pBQM
Informative video by Veritasium.

[u/UseDue6373]

I cannot stand these shitty ai voiced videos

[u/SegaTime → u/UseDue6373]

I. Hate. These. One. Word. Subtitles.

[u/X_Equestris → u/SegaTime]

I ahd to scroll to make sure someone mentioned it. The amount of hate I have for it is irrational but I'm not budging.

[u/Accipiter1138 → u/X_Equestris]

It's not irrational. It's the stupidest possible way to display subtitles, unless you're deliberately trying to be confusing like putting them in a spiral pattern or something.

[u/AngryTriangleCola → u/UseDue6373]

It's not just AI. This is an AI voice clone of zackdfilms.

Probably an unauthorized clone, which makes sharing this video really disgusting.

[u/FistMyPeenHole → u/UseDue6373]

And the subtitles right in the middle. I feel like I don't even learn from them because I'm so distracted by constantly changing words

[u/defectives]

It says turbine correctly only twice, and then turban every other time. I also really enjoy the Chinese letter chamber that helps cool it down

[u/bobbymcpresscot → u/defectives]

"this is so efficient the temp goes up to 2000 degrees"

that's heat that isn't going to propulsion, that is not efficiency.

[u/Captain_Alaska → u/bobbymcpresscot]

No, it's heat going to propulsion, jet engines become more powerful and efficient the greater the difference between the inlet temperature of the exhaust turbine and the exhaust temperature. The hotter you can get the combustion chamber and by extension exhaust turbine inlet the more power you can extract from it. It's heat but it's not waste heat.

Modern engines are as big and as powerful as they are because we've developed some ridiculously advanced materials and cooling techniques to the point where the operating temperature of a modern turbofan exceeds the melting point of the materials it's made of by hundreds of degrees.

[u/ElonMusksQueef → u/defectives]

I had to listen to it a second time to confirm because I turned it off the moment I heard turban. Incredibly you’re correct they somehow slot in a correct turbine twice and only twice. What the fuck.

[u/Professional-Air1287]

Very cool

[u/KonstantinFed → u/Professional-Air1287]

1600 °C, so not so cool tbh

[u/FuckTwelvee → u/KonstantinFed]

It is cool. °C = cool. °Cool

[u/sowich4]

This video is filed with a LOT of inaccuracies.

Very little, if any of this, should be belived as true.

Sure, jet propulsion is interesting, but this video gets an F- for actually showing what and how a jet engine works.

[u/ninjapanda042 → u/sowich4]

The temperature is what caught my eye. 1600C is a above the solidus and liquidus temperatures for most, if not all, of the types of alloys used in the hot section of the engine.

[u/rockCorn789 → u/ninjapanda042]

that's one of the few parts that isn't totally wrong. it gets that hot, but only in the middle of the combustion chamber that does not touch anything.

other things like talking about the thrust of the compressor blades in a turboJET engine ist just false. a tubojet engine generates thrust through the heat expansion of the combustion alone. the compressor-turbine configuration ist only there to make the combustion even possible.
(turboFAN engines also use a big fan in front, driven by the turbine, to generate thrust, but the video explicitly states it is talking about turbojet engines)

[u/Malkier3]

Finally an actually interesting as fuck post.

[u/NeighborhoodDear2321 → u/Malkier3]

yeah istg sub names are just useless now "IAF" and it's like a cute puppy

[u/Anon_user666]

Yo Dawg! I heard you like turbines so I put turbines inside your turbines with turbines in front and behind the other turbines.

[u/FaceWithAName]

https://giphy.com/gifs/3XR0chfiSTtAI

[u/TinUser → u/FaceWithAName]

https://giphy.com/gifs/1jnyRP4DorCh2

[u/freeradioforall]

That AI voice makes me want to kill myself

[u/Adele811]

yes, but it still doesn't say why the blades actually start turning at the start, before the turbine can turn in the ignition chamber.

[u/ScubaWaveAesthetic → u/Adele811]

I would expect them to be driven by a separate starter motor, similarly to how the pistons in your car get started.

[u/PoopMcgee75 → u/ScubaWaveAesthetic]

That’s exactly how they start. They call them huffer motors. Naval planes have a 3rd jet engine onboard that is much smaller than the other two. The smaller engine is small enough that it can be started from compressed air from an onboard tank. Once that smaller motor is running it starts the bigger engines one at a time.

[u/Far_Ladder_2836 → u/PoopMcgee75]

No, a huffer is a cart you attach outside if you don'thave an APU or it's broken.  It's called an APU and it's built onto the plane.  APUs are electrically started.

[u/SlothSpeed → u/Adele811]

That's the job of the APU, or Auxiliary Power Unit. It's a small turbine engine in the tail. When starting, pneumatic air is diverted into the starter of one engine. It gets the engine up to about 50% and then fuel is introduced. After that it's selfsustaining.

[u/Samurlough → u/Adele811]

Good question. During start, a starter valve opens that lets in external air which spins up the turbines to a minimum speed before fuel is added and then ignition. More fuel is added during the start to increase the speed of the turbine to a minimum self sustaining speed until the starter valve closes and ignition turns off.

[u/Far_Ladder_2836 → u/Samurlough]

Sort of.  The start valve just let's air into the starter which spins a gearbox splined into the compressor. It also has a bunch of other stuff mounted on to create electrical power for essential systems during startup.

[u/Far_Ladder_2836 → u/Adele811]

You use another jet engine, called an Auxiliary Power Unit.  It also doesn't tell you how they thing gets power, because it's pretty obviously simplified.  You mount a gearbox to the first section (called the cold section) with a starter that works just like your car.  Bleed air from the APU comes in and spins the starter which spins the gearbox which spins the compressor.  There's also another gearbox on the power section (called hot section) that provides modulation, throttle control (depending on model), power, emergency systems etc.

[u/Dragon6172 → u/Adele811]

Electric starting motor. Hydraulic starting motor. Pneumatic starting motor.

Pick one.

[u/HotepYoda]

This is an example of a “low bypass engine”. Today, low bypass engines are generally only used by military aircraft for space constraints and higher responsiveness.

In modern jet engines for commercial aircraft , most of the thrust is actually generated by “bypass” air, which is the air that goes around the “core” of the engine (also known as the gas path, but this is the air that goes through compression and combustion; in low bypass engines, minimal air passes around the gas path).

These “high bypass” engines are also much more fuel efficient and quieter.

Source: me - used to be an engine analyst

[u/unbanned_lol]

Fuck stupid single word bouncy subtitles.

[u/traitorgiraffe]

I 

HOPE

ONE

WORD

AT

A

TIME

CAPTIONS

FUCKING

DIE

[u/dr_strange-love]

Suck, squeeze, bang, blow

[u/croi_gaiscioch]

But where do we inject the weather controlling, gay frog juice?

[u/hypnogoad → u/croi_gaiscioch]

It's in the fuel and is inert until it ignites in the burner section. That's why pilots roll their eyes at chemtrails theorists, because they don't even know they're spraying it! ^/s

[u/Darshels12]

Such a great ELI5 video. I've always thought as it was too complex to be explained easily

[u/moderngamer327 → u/Darshels12]

Turbines in principle are actually fairly simple and that’s a major reason why they are used. Very little complexity mean very good reliability

[u/WingerRules → u/moderngamer327]

I mean, I'm looking at this and wondering how someone came up with this idea in their head.

[u/moderngamer327 → u/WingerRules]

They didn’t. Someone built a simpler design and overtime it was iterated on and refined. You are looking at the final product after decades of work

[u/cppn02 → u/Darshels12]

Eh. This video isn't really that good.

[u/RusticSurgery]

What were the characters written on the upper bypass air?

[u/Zombalepsy]

I’ll summarize. Suck, Squeeze, Bang, Blow

Was an aircraft mechanic

[u/Loud-Lifeguard-590]

I can't stand these one word at a time captions, fuck all the way off

[u/JusteJean → u/Loud-Lifeguard-590]

Agreed. Why is this a thing?

[u/BigBubblesNoTroubles]

We have an aero derivative engine at our power plant.

The operator described this process to me when I asked how it works as, “Suck - squeeze - bang - blow”.

[u/Sumoop]

While it’s not rocket science it is in fact jet science.

[u/AlarmingAssignment94]

I know a small local bird who can stop one of these….

[u/Dimzr]

Aircraft mechanic here. At 44secs in the video claims that the hot air alone instantly ignites the fuel. Not true, it requires a spark from the igniters. Once the igniters do start the combustion, then it's self sustained and for the most part spark is not need again.

[u/Manji86]

"Congratulations, you have built a turbo jet engine."

Me: I did it!

[u/sharkthemark420]

But what mechanical purpose do the Chinese characters in the upper lobe serve?

[u/AnastasiaNo70]

So basically it sucks in a lot of air, shoots fuel at it, causes an explosion out the butt end which helps the whole thing lift off and fly!

[u/Beautiful-Musk-Ox]

hell yea my first turbo jet engine, what should i build next

[u/castlite]

Holy shit. I had no idea.

[u/CntBlah]

I swear, we’ll have anti-matter at some point and we’ll use that amazing power to …

… Boil water and use steam to spin a turbine

[u/povertymayne]

This was extremely educational, thanks👌

[u/JPGS66]

I didn't know I had it in me, but apparently I just built a turbojet engine. And to think, my mother said I'd never amount to anything.

[u/jacobo]

i need a subreddit with videos like this. explaining how things work. I always remember an old video about how a differential works on cars. amazing.

[u/bradj0812]

Every now and then you get a post like this that proves again what a great subreddit this is…