SLS Core Stage Hot Fire Test (full duration)

NASA performed a second hot fire test of the core stage of the Space Launch System (SLS) rocket at NASA’s Stennis Space Center, Mississippi, on 18 March 2021, at 20:37 UTC (15:37 CDT, 16:37 EDT). During the test, that lasted 499.6 seconds, the four Aerojet Rocketdyne RS-25 engines were fired to simulate the stage’s operation during launch, generating 1.6 million pounds of thrust.
Credit: NASA

[@SciNewsRo]

NASA’s Space Launch System kzbin.info/aero/PLpGTA7wMEDFhjDiGXCfiEOhN8bLaq9NBP Short history of reusable rockets kzbin.info/www/bejne/kIW6f2yQZ8qFppY International Space Station kzbin.info/aero/PLpGTA7wMEDFjV3rHufRlA_0vdSQFL9a40

[@squirrelguy2195]

As a guy who grew up in the Shuttle era, hearing the RS-25 fire up again just sends shivers down my spine.

[@EstorilEm]

It's an incredible rocket engine design, that's for sure.

[@goldgamercommenting2990]

These included the older rs-25s from the first shuttle

[@3boud84]

but the sad fact is, it’s for a single use only witch is huge waste of money and inventory

[@Doggeslife]

Never heard FOUR together before though. Awesome.

[@mannybudhu3905]

That is over 10 million horsepower.

[@jbrevet66]

That flame diverter is the real hero in all this.

[@mikebeer1567]

I would love to see a documentary on the design of the testing platform, it must be immensely strong

[@EchoesDistant]

Here you go! Stennis Space Center Virtual Tour. kzbin.info/www/bejne/qoGak4GQqZWEeLcsi=sb_5udol7M9AfYX9

[@supernova4760]

It's just really heavy. Think of a concrete base that is millions of pounds heavy.

[@ianmangham4570]

Lots of steel and concrete

[@byugrad1024]

I believe you can see the beams flexing when all four engines are gimballing around.

[@rustygates3367]

That was beyond cool. The gimballing at 1:57 was f* awesome. The first time FOUR RS-25's have been fired together! My absolute favourite rocket engine, always has been, always will be.

[@johnnyghanja]

Definitely cool

[@fmbbeachbum8163]

I'm still in awe of the Saturn Vs. Seeing them in 4k in the movie Apollo 11 was incredible.

[@thejerseyj5479]

@@fmbbeachbum8163 these four engines generated 1.6 million pounds of thrust. No small feat, however, the Saturn 5's five F1 engines developed 7.5 million pounds of thrust. Staggering !!!

[@johnpolhamus9041]

Yeah, this is 1/7 of a Saturn V array of five F-1's!

[@kellyBorgman]

@@thejerseyj5479 each F1 engine produced 1.5-1.6 million pounds of thrust. All 5 in Saturn 5 launches produced 7.5 million pounds of thrust.

[@DarkFalconAnimations]

I remember watching this live and I was literally saying to myself, "Please don't shut down, please don't shut down."

[@PetrPss]

There are three things for which you can watch forever: fire burning, water flowing and burning fire creating flowing water.

[@renesoucy3444]

You can see rain falling from the clouds of those engines… unbelievable release of energy!

[@Blarnix]

Hearing those RS-25’s come back to life is magical. Go SLS, go NASA.

[@gen2mediainc.577]

oh yes my favorite engine :D purely for the exhaust

[@Blarnix]

@@gen2mediainc.577 those beautiful shock diamonds

[@georgegherghinescu]

To me they seem to run in such a smooth and controlled maner.. effortless somehow and the clean exhaust.. seeing them run again brings joy and admiration, a very special engine just as the vehicle it used to power. It's quite sad and unfortunate that four will be lost at the end of each launch.. PS: how about "reactivating" a Shuttle and the 747 carrier plane and droping it (early Enterprise test style) for a demonstration landing at airshows once or twice a year? The Brits kept some of their iconic stuff in almost flying condition for airshows like the very cool Vulkan bomber :D

[@Ignisan_66]

Senate Launch System is a pointless outdated rocket. SpaceX Starship will blow the Senate Launch System out of the water. POINTLESS ROCKET!!!! GO SPACEX!!!

[@s.s.85]

There's few sounds as awe-inspiring as the sound of a huge rocket engine ripping the gravity a new one!

[@CannonFodder873]

I'd like to SEE an Alcubierre Drive ripping SPACE a new one.🤔

[@DGFishRfine1]

As someone who has done a tragic amount of eyerolling at the SLS (which I've wanted very much to love)... That was one of the coolest things I've ever seen.

[@b1blancer1]

Interesting fact: The outlet pressures of the high pressure turbopumps is actually higher than the pressure inside the combustion chamber. Also notice at 4:45 how all that water vapor is creating heavy rain just to the left of and behind the tower.

[@appropinquo3236]

Any plumbing that comes before the combustion chamber needs to be at a higher pressure then the combustion chamber, to prevent gases from flowing back into the engine.

[@aaaeee2862]

Can they use this method to bring rain to drought stricken areas?

[@northtexasskies7786]

@@aaaeee2862 maybe but it would cost a lot.

[@aaaeee2862]

@@northtexasskies7786 👍

[@aaaeee2862]

@@neodiniankatanaflake9666 Isn’t rocket fuel environmentally safe? They use hydrogen and oxygen, which turns to water.

[@heythere135]

I was on edge after the first hot fire attempt. Was counting every minute on my watch hoping it would make it to the 8 minute mark. Glad to see it moving forward. I love SpaceX but it will also be cool to see this thing fly, if it ever does

[@technoquetz126]

This thing will launch August 29 to the moon!

[@LesFelts]

August 29 was scrubbed. New date is Saturday September 3, 2022 at 14:17 EDT.

[@SpirosPagiatakis]

You sir are a traitor to the SpaceX company... Shame on you, think about poor Elon!

[@davidmella1174]

@@LesFelts second scrub

[@av8644]

😁 soon?

[@nightgazr]

Impressive cloud machine 👏

[@LSD123.]

I read at the start of the video that the propellant is liquid hydrogen & liquid oxygen. Is the cloud just water vapor? Sorry if it's a stupid question, I definitely ain't no rocket scientist…

[@book824]

@@LSD123. The cloud like is water vapor but not really from the engines, in the beginning there is a lot of water flowing out and as the engine fires up, it vaporize the water into steam, the water keep flowing to during the burn there is always steam coming out as the exhaust from the engine vaporize them, and yes the engine do generate water vapor but you can't see them. Also the water is used to keep the structure intact as the sound from the engine can destroy it.

[@fork9001]

@@LSD123. Steam mostly.

[@fork9001]

people should use a set of RS-25 to vape instead

[@nascarman38n88]

@@fork9001 LOL

[@grandoceaniclinesrblx8772]

I saw RS-25 engines in person and they are absolutely massive.

[@ryanritter7814]

Getting hyped for artemis 1!

[@TheJimtanker]

Yea, maybe we'll see something in 20 years or so.

[@forgeskygaming3355]

Yea!!!! Am excited too! But ngl, SpaceX would have already put a starship on mars by then

[@TheJimtanker]

@@forgeskygaming3355 20 years and SpaceX will have hotels and gas stations on the Moon and Mars for NASA to visit.

[@forgeskygaming3355]

@@TheJimtanker I mean nasa ain't that bad also remember that spacex would have been nothing without NASA

[@TheJimtanker]

@@forgeskygaming3355 What did NASA do for SpaceX?

[@SRolla]

Water company: “So approximately how many cubic meters of water do you need guys for your rocket test?” NASA: “Yes”

[@neriozulberti1492]

Or when the head engineer’s wife ask much more steam for her iron 😄

[@paulierosenbaum8213]

Being a plumber I would love to build the pump system for that. Ohh well there's always a chance to get to work there.

[@Rambo2-501]

Didn’t realize these engines are also called “The Vector” in Kerbal Space Program are what I use on some of my heavy landers. So cool!

[@leehasenour6202]

Ahh... the raw power of the new SLS core stage!!!🔥

[@ukaszwisniewski2774]

Now you know, how looks clouds factory !

[@buhwhatidk]

engrish

[@leokimvideo]

Amazing it formed its own weather system and rain was falling. So nice to see reliable old tech put to new use.

[@scottscott6794]

That was absolutely awesome. The power the thrust, the engineering of the building that these engines were held in. Thank you for this video I thought it was awesome.

[@jessefoulk]

And just think, there are two SRB's blasting away along with these at launch. Incredible sound

[@tvre0]

Somebody should overlay the sounds to get an idea of what it will sound like

[@Nuvenss]

Tons of water are used do reduce de external noise.

[@jacksdjfam]

Water based sound suppression system which without it could cause the acoustic energy given off by the engines to damage the vehicle...plus in terms of fuel : 540,000 gallons of liquid hydrogen 200,000 gallons of liquid oxygen

[@sinpi314]

The water evaporates and becomes clouds, the clouds precipitate, no water is wasted here :’)

[@twmax4137]

Plus the exhaust is just water vapor

[@gavinperch9413]

Is it true that the sound is reduced because the noise from the rocket engine vibrates the water droplets to heat them to a vapor and its that vibration energy that is being used to heat the water instead of continuing on as sound waves?

[@aerospacecinematics7120]

Go Nasa, Go Artemis, Go to the moon

[@TheJimtanker]

Go SpaceX and go Blue Origin!!!

[@Cnightz]

I was waiting for the test pad to start lifting into space. Instead we were just pulled out of orbit for 8 mins ;) Very impressive gimbel test!

[@twobyfour]

Haha! Great comment.

[@DevSolar]

Since the rocket exhaust hits the ground and pushes it as well, most thrust of that burn is being cancelled out. The deflection to one side would generate the largest thrust vector, but compared to the mass of the earth that's not even a pinprick.

[@dundisdundat7022]

At about 5 minutes I just teared up in immense laughter from the thrill of this this is amazing !! I need to feel this up close

[@andrewhillis2269]

Just don't get too close because the sound energy coming from those engines would rip a person to shreds ! ! ! 👍👍👍👍👍👍

[@alexandrek2555]

@@andrewhillis2269 une telle puissance

[@MrAnswerification]

"Place him where he can be assured of warmth."

[@samuelescapejr.2872]

@@andrewhillis2269 r

[@THE-BUNKEN-DRUM]

That's what she said. 😉

[@krultepes57]

Fact : It's the biggest and most powerful stage tested since Saturn V first stage test

[@GumballAstronaut7206]

Ssssh don’t let the SpaceX fanboys hear you

[@pebmets]

@@GumballAstronaut7206 They are in denial that the RS-25s have performed magnificently while Space X is still attempting to get the Raptors stable.

[@GumballAstronaut7206]

@@pebmets Not only that, the only reason why the raptors are even able have the power to lift the Starship Super Heavy, is in numbers....the Saturn V, SLS, and even the Space Shuttle engines used nothing but raw power.

[@pebmets]

@@user-zl5cv6vw2m People keep criticizing the RS-25s because they have been around a long time. These are not the same engines from 1981. They have been upgraded and enhanced since them. This is why they run at 109%. Since there initial specs, they have been improved to get that much more performance. They have flown 405 times with only one failure and that mission was still able to continue. Yes raptors are relatively new, but new does not equal better. Liquid Hydrogen is a very efficient, (and cleaner), fuel but very difficult to store. It would be very difficult to use hydrogen on long space flights because of the need to keep it very cold to keep it from venting. Are raptors better engines? We really won't know until SpaceX gets them stable. As of now, The RS-25s is a more stable and efficient engine. Over time, this could change, but not as of today.

[@evandavid9087]

Was Saturn V more powerful? I would have thought this would be more powerful for some reason

[@jerrypolverino6025]

I always loved the RS 25’s. Reliable, powerful, efficient.

[@MMCUSN]

Because shock diamonds never get old and watching four rocket engines twerk in unison is always a crowd pleaser. 😊

[@Woodsballer209]

"...watching four rocket engines twerk in unison" Gave me a fit of laughter. From a DS3, thank you Chief.⚓

[@jayfblank]

lmao! Love it. I will never view an engine gimbal the same again!

[@Spacey_key]

Holy shit it actually worked

[@tonymercer8588]

Haha. My thoughts exactly. I really didn't think they would pull it off.

[@jptwentyfour887]

@@tonymercer8588 um this stuff is pulled off all the time

[@acr5605]

@@jptwentyfour887 first try something broke

[@jerryham5659]

@@acr5605 Nothing broke first try, just the engines had tight temperature parameters that were breached, but it wouldn't have mattered in flight.

[@EstorilEm]

Uh, the RS-25's have a perfect track record during the Space Shuttle program (well minus a sensor that shut one down, but they still got to orbit) - the engine itself is (and has been for decades) a modern marvel, especially given its complexity and reliability. The only thing holding SLS back is politics. Every new administration sends NASA in a different direction, and these days, all the defense contractors want the biggest piece of the pie they can get. It's not really NASA's fault. :(

[@pebmets]

Here is the proof that we do have a rain machine.

[@BeezyKing99]

they need to fire up all of the rain machines to help cool off the planet

[@robertzeurunkl8401]

4:43 -- All that water vapor is creating actual rainfall in the background. Neat. How cool would it be to stand in a rainshower created by a NASA ROCKET engine!

[@23Skadoosh]

You having a wet dream. Hahahahaha

[@xxHOLESHOTxx]

Aerojet Rocketdyne and Boeing collaboration.*** NASA gets too much credit for writing a check.

[@DogSerious]

@@MDE_never_dies You do when you get flooded out and then they have the nerve to shout "Climate Change"

[@Elimarzordan]

Did someone else see the rain from the cloud?

[@my3dviews]

Yes, they did say that it caused it to rain.

[@Elimarzordan]

@@my3dviews Awesome 😃

[@EchoesDistant]

This is common from RS-25 tests and launches. They combine LOx and LH2 and emit water vapor as exhaust.

[@claudevieaul1465]

I've known this for decades but I am still amazed that from 2 frozen gases a form of absolute *hell* is produced exiting at stupendous velocities 😀 I so would like to experience this up close, but of course that's out of the question - the noise levels alone are lethal. We'll make do with the images 😜

[@Hippida]

And, isn't the exhaust basically water vapor ?

[@BerzerkaDurk]

@@Hippida yes

[@davidthorsby8225]

Earplugs an safety glasses ! She'll be right bruv get as close as u want "no wucken furries"!! Hahahahaha

[@Inertia888]

@@Hippida It is fascinating that hydrogen & oxygen, the two components of water, can be mixed and burned to make such fire! And then at the outlet, water is used again to tame that fire!

[@yxeaviationphotog]

Kind of cool....at about 4:42, there is actually rain coming from that exhaust cloud.

[@notmo.]

It's just pure water, right?

[@yxeaviationphotog]

@@notmo. Yup.

[@apolloskyfacer5842]

There was the mighty Saturn V, and now THIS !

[@sting1111]

Ya I would like to see 5 F1s in a test. They didn’t need srb,s

[@tomcline5631]

This stack,all up,with however many boosters it's gonna use is still only 20% more powerful than the the 5 F1 engines on the Saturn V! It's cool but kinda embarrassing at the same time. This "brand new venture" is flying on 40+ year old technology! Only reason it ain't flying on 60 year old technology is that they didn't have any flight capable F1s and this new super genius generation couldn't build a copy! So,cool the govt is trying,but damn guys. They designed built and tested those mighty F1s with less computing power than a Casio calculater watch!THEN FLEW THEM BITCHES TO THE MOON!!!!! We can't even get into low earth orbit(manned) with out help!

[@thejerseyj5479]

@@tomcline5631 we need those guys with the white short sleeve shirts, skinny black ties and pocket protecters !!! They got us to the Moon and back with slide rules and pencil and paper. Amazing men.

[@tomcline5631]

Ain't no shit! This generation of nerds can't even get outta bed without their computers! These kids can't even read or write in cursive any more! If you left them alone with a slide rule pencil and paper,they couldn't add 2+2 and come up with the same answer 4 times in a row. The govt shouldn't have retired the shuttles without a replacement system Flying. All these bummed rides with the Russians have cost us hundreds and hundreds of million dollars! And I'm not impressed to much with the civilian rocket men they got Workin on private projects. The US needs our own manned orbit capable system that way these civilian private companies can't control access!

[@mickclitheroe8585]

Ooh, I just know that something good is gonna happen ☁️🌨☁️

[@A-Smith]

I don't know when, But just saying it could even make it happen....

[@clazza65]

Utah Saints.

[@user-rk9nf5ee5m]

@@clazza65Kate Bush “cloudbusting”

[@user-rk9nf5ee5m]

@@clazza65Kate Bush

[@user-rk9nf5ee5m]

@@clazza65Cloudbusting

[@dhtelevision]

1.6 million lbs of thrust, not as much as the Rocketdyne F1, but still extremely powerful.

[@fromnorway643]

About the same as a single F-1, but the Saturn V had _five_ of those.

[@007stopjockin]

SLS will have 11.9 million pounds of thrust at take off. Who's going in March?!?! I will be there! 007

[@greatvalue1441]

@@007stopjockin March lol starship will be beautiful when it takes off

[@alanwatts8239]

@@greatvalue1441 Even more so when it explodes in the air as a result of being rushed.

[@technoquetz126]

@@alanwatts8239 exactly, it seems like Spacex rockets explode like every day, and just because musk claims that some rocket that’s never been tested will put 1 million people on mars by 2050 does not mean it will happen, because I guarantee all of his supporters that it won’t

[@robertbowes7054]

That is truly an amazing sight/sound!

[@jimdevlin2138]

8m22s that spinning cone of flame at the back is just beautiful.

[@curtelliott3344]

I remember back when the Saturn Five rockets where going and this video just brings back those memories. It's just awesome.

[@imetzl9340]

What blows my mind is you could easily rest your hands on the bell of those nozzles while firing and it would be too cold to keep them there, not too hot. Obviously you couldnt stand there regardless but still, the use of the below freezing fuel running through the bells to keep them cold during firing is remarkable engineering

[@afoxwithahat7846]

The vibrations from the engine would likely break your hands

[@cow472]

@@afoxwithahat7846 Actually the sound waves would burst all of the blood vessels in your body if you were anywhere near that building when those rockets went off

[@imetzl9340]

@@afoxwithahat7846 Obviously. I was just speaking to how cold the the bells were and giving an analogy

[@AlphaGametauri]

@@imetzl9340 Don't, some people just don't understand expressions

[@andrewmichleski3649]

The engine bells and nozzle are about 800 f.. but the hot gas over 1500f.

[@olelaue5078]

Sad that those RS25s won't be recovered like in Shuttle times

[@ranger7yago306]

The smoke looks so clean

[@SciNewsRo]

Hydrogen + Oxygen = water

[@MichaelTheRead]

Literally the cleanest-burning engine we've ever invented. The exhaust it produces is almost pure water vapor.

[@Megacat8199]

It is pure water vapor, in fact all pure hydrolox engines produce water vapor

[@_mikolaj_]

GO ARTEMIS! amazing test!

[@reedschrichte800]

@2:23 what are the flames around the top of the rightmost engine?

[@notflyingcereal3575]

Its trapped gas from the exhaust it was expected to happen but during flight it would be put out from low atmospheric pressure

[@reedschrichte800]

@@notflyingcereal3575 Thanks! A bit unnerving to observe though.

[@Peyethon]

The moment I saw those during the livestream, I thought an abort was coming

[@SciNewsRo]

It was actually explained during the livestream, shortly after the test was over. Just some insulation used only for the test. It will not be used when the rocket launches.

[@reedschrichte800]

@@SciNewsRo Thank you!

[@cowerdnerddespacito9518]

The Kerbal space program route of slapping some vector engines onto an orange tank and praying for the best

[@saints093]

I'm glad they are reusing the main engines from the space shuttles for the SLS project, at least the main engines from the shuttles weren't scrapped & just glad they have a new life

[@midsouthexpress]

They have one last hurrah, unfortunately they won't be recovered and them and the boosters will fall into the ocean to never fly again..

[@literallyshaking8019]

Impressive. Now let’s see Paul Allen’s SLS Core Stage Hot Fire Test (full duration).

[@f3p]

The gimbal test looked like the engines were about to fall off lol

[@chrisjohnston4445]

Yeah, I wasn't expecting that, so I got worried!

[@Sailor5116]

I used to live about 10 miles from the Stennis test site. In the cool, dense air on winter nights when the shuttle engines were tested, my windows would rattle.

[@lancer525]

If all you guys think it was cool to hear the RS-25s light up, you should have heard 5 F-1s go. Miles away on the beach, you could _feel_ it in your guts. There has never been another sound remotely comparable. I'm lucky enough to have been there for two of those launches. Wish you could have been too...

[@Galactipod]

If you were right next to the vessel, the sound alone would literally kill you instantly.

[@frayedsanity]

Seriously I love these engines. They don't pollute the atmosphere at all! They just make a huge rain cloud! Fusing to separated elements back together! so good!

[@veergauba]

You do get a little bit of Nitrogen Oxide (NOx), which is a pollutant. This occurs when the hot rocket exhaust combines with air.

[@frayedsanity]

@Veer G did not know that...I stand corrected 😅

[@Ignisan_66]

How do you think they make the hydrogen? By electrolysis using "green" electricity? Nah, way too expensive. They use regular "grey" hydrogen made by methane steam reforming. That is a process that produces CO2. Add in the crappy solid rocket boosters which produce a lot of *solid* particulate matter and you have a pretty dirty rocket.

[@stargazersmith1895]

The blue shock cone is great

[@andrewhillis2269]

Also known as shock diamonds & mach diamonds ! ! ! 👍👍👍👍👍👍

[@johnnyloco970]

@@andrewhillis2269 yes it looks like a blue tornado. A tight diamond is preferred and any more than one like we see with the raptor is not desirable.

[@robertzeurunkl8401]

Man, when you watch it up close like this, 8 minutes is a HELL OF A LONG TIME!

[@SouperAsH]

Remembering the F1 engine, and how sooty it burned, compared to the clarity of the RS25... Yes, the output is very different, but when four of the newer designs are ganged together, it makes for a very impressive display of raw power.

[@andrewmichleski3649]

Different fuel .

[@overthetip]

The RS25 are not as powerful though. That's why they need two giant SRB.

[@moltenlavaguy9334]

NASA good SpaceX good ULA good

[@narke2667]

Blue Origin bad

[@miguellopez3392]

ULA bad.

[@miguellopez3392]

@ ULA put itself as sole launch provider though politics and then took in a free 1 billion a year for doing nothing, stagnating progress as they intentionally moved slow to employ longer.

[@gokulnathg5801]

SpaceX bad 💩

[@CStone-xn4oy]

Its about dang time that SLS gave some good news about itself. Maybe it will survive after all. Lets start with Artemis I and see where things go.

[@aaronwilliams8621]

That will toast your marshmallow

[@fellpower]

Releasing that much power is incredible ^^

[@abizair1832]

The sound's so immersive, i can feel the G-force pulling me

[@adarsh4764]

Bruh any animals in the nearby forest would be like- Yo, today the clouds came so down!

[@tigertrap2269]

Using a two-stage High Pressure Oxygen Turbo pump turbine, the turbine produces 29,410 horsepower to pump 69.6 pounds of liquid oxygen per second.

[@MRCHANNEL2123]

reminds me of the Apollo missions, but in the 21st century

[@geomodelrailroader]

Good Job Stennis! now get that core to the Cape the boosters are waiting.

[@Volker1944]

Well, this time it functioned. Congratulations, NASA.

[@mikebeer1567]

What is the thrust of this compared to apollo

[@Jason-gt2kx]

Will be an awesome sight. I hope it launches this year.

[@justanotherasian4395]

That is sick.

[@rattywoof5259]

Why?

[@justanotherasian4395]

@@rattywoof5259 sick as in cool.

[@jptwentyfour887]

@@justanotherasian4395 nah hes an idiot, he’s asking why to the “sick as in cool”.

[@my3dviews]

@@justanotherasian4395 It wasn't cool. It was really hot. 😂😂😂

[@jessefoulk]

I can't believe it's already been over a year since this finally happened

[@JeffGoins88]

The outside of the bell was still frozen through the entire static fire! 🔥 🥶 😳

[@James-cb7nb]

Will these engines fit in my Honda?

[@ND-jf2bm]

What are you up to?

[@unknowndivision170]

No. This engine is too big for your honda 😂

[@MrTwins95]

I've been pretty critical of the SLS, its way too expensive and has taken way too long.. but that being said, its being built regardless, I can't wait to see this thing fly. It's basically all ready at this point for Artemis 1, I just hope there's no more delays for some reason.

[@whyiseverysinglehandletaken2]

The SLS isn't expensive, the development is

[@MrTwins95]

@@whyiseverysinglehandletaken2same difference for the tax payers. We pay for it all the same. The program as a whole is just expensive. And yes, even an individual launch of an SLS is still expensive in of itself.

[@Gaetano.94]

Just for today hopefully:(

[@sandroutb]

Enjoy paying SpaceX 2.9 billions for two moon landings then!

[@dsdy1205]

1:58 My dog when I bring out the leash

[@Blubb5000]

And this is how cumulus nimbus clouds are born.

[@fifaRAWR]

Jeremy Clarkson approves POWWWEEEEERRRRR

[@EstorilEm]

I'd love to know how much water they went through for this test... I can't even comprehend it. The standard deluge system uses an incredible amount, but a full-duration burn?!

[@abizair1832]

Might as well use an entire lake for testing

[@alanwatts8239]

They don't use any water, the water is created when the hydrogen burns together with oxygen.

[@alanwatts8239]

@Smithy18 Never heard of that, is it isolated to the RS-25?

[@George.Coleman]

Holy Moly imagine the speed this thing could achieve with an 8 min burn in space

[@jeremyboles2558]

Wonder how far away you can feel ground shake

[@voongnz]

Excellent test!🚀

[@meesalikeu]

big congrats to nasa that was awesome! 👍🏽☄️💫🚀

[@-ThisIsTheWay-]

I can't wait to see that thing take off

[@sheltechllc]

Just watched the 1960s test from NASA and the difference between the cleanliness of the fuel burn has REALY changed over the decades.

[@TheSteveSteele]

The Kerosene engines ran rich which produced that soot.

[@mkvenu7474]

Congrats NASA and the whole team, GREAT 🙏

[@reedschrichte800]

@4:52 behind the test stand it looks like the exhaust cloud is raining :-)

[@jorge9312]

Es vapor de agua y al enfriarse se condensa y llueve. Lo mismo pasa en el edificio de montaje donde se ensambla el saturno 5 llovía.

[@humanhiveanomaly]

Could be, pretty water saturated and hot. Not much cooling needed to precipitate out.

[@stargazersmith1895]

Yep

[@jptwentyfour887]

It does, i work on the site, saw a couple tests in person, and got to see this one today.

[@michaelwilliams8297]

The vortices in the exhaust cone are beyond cool

[@robertsawaryn5596]

They call them shock diamonds

[@brianv1988]

Felt like it was on for a half hour but it was olny 9 min these engines are amazing so glad there using them love it cant wait for the orbital flight test it's going to be so awesome and history will be made again

[@exospacelab6630]

Yas

[@TheRepublicofKnowledge]

Why was there a fire near one of the engine’s?

[@benjamina8357]

Maybe because they are rocket engines that literally spew fire /s

[@FonicsSuck]

It's common for areas surrounding the thrust make it happeners to catch fire, it's typically some sort of ablative coating that is burning off specifically to protect the core stage from the bazillion degree heat. You'll see this on most, if not all rocket stages.

[@3nigma.3nc]

Normal in a test condition, the material on fire is protecting the internals. This fire would not be as bad during flight.

[@kristenburnout1]

CAPU exhaust

[@rubiks6]

It could be that that's what rocket engines do. Just my guess.

[@Bohdan_Medvedskyy]

RS-25 disposal program. I hope after SLS they will start producing the RS-68.

[@AlainHubert]

We're in 2022, and NASA still doesn't have high-fidelity communications equipment?

[@evolicious]

This is what high-fidelity comms hardware sounds like. You need the correct hardware and have a direct connection to actually get the experience. Same tech used in commercial and private aviation.

[@AlainHubert]

@@evolicious The comms tech used in commercial and private aviation is antiquated and sounds really terrible also. Time for an upgrade. The microphones and their preamps are the culprits. We have smartphones capable of removing 95% of background noise in audio conversations, with high fidelity sound, no need for mics stuck to the side of the mouth with awful wind noises, pop and hisses, so why not something as efficient in commercial comms too?

[@jonhayes9223]

Heavy lift but only single use, right? I sure hope we’re still building those engines. Seems wasteful in in the age of reusable boosters.

[@MaryJane-sj3gw]

No. Reusable. One of those was on the Hubble mission and one was on the Shuttle that took the oldest astronaut into space.

[@mrczymbor9580]

especially since the engines are designed for reuse, they are old space shuttle engines

[@jonhayes9223]

@@MaryJane-sj3gw yup, I knew they were previously flown. My point was they’re not coming back from the next flight.

[@my3dviews]

They are using up the existing 16 engines on the first four flights and then will produce single use equivalent engines, which are supposed to cost less than if they built the same ones as these.

[@Theironminer-ky2pg]

they are using spare engines, once they have used all of the spare RS-25 engines they will make an equivalent engine that is not reusable.

[@html8525]

To the Moon!!! 🚀🚀🚀

[@perplexical]

imagine it broke free and the core stage just flew away 💀

[@rikvermar7583]

they should build more test stands in countries affected by severe droughts

[@exospacelab6630]

Sucsess

[@waitwhat3547]

@@edelahaye oww! doog englsh!

[@blackhatfreak]

NASA will be on the moon and mars before Starship even launches a full stack.

[@BigPlanesCustomLEGOaircraft]

You're kidding me, right? The SLS has been in the works for over a decade and has yet to even see a single flight. Starship has been around in any real sense for only a couple of years and has seen multiple flights, albeit not all successful, and is looking to launch a full-stack by the end of the year. NASA is a government bureaucracy that has to deal with multiple slow contractors and is at the whim of Congress. We'll be lucky to see a manned moon mission by 2050 let alone a mars mission. NASA does great work, but they are using reused technology from the shuttle that won't even be able to land on the moon in one launch. SpaceX is developing a completely new generation of rockets, that if it can be successful, will make mars missions possible.

[@stegatops1]

Imagine the noise at the edge of the bunker!

[@djohanson99]

that was neat. now just think of all the energy dissipation that has to occur to a spacecraft when it has to return thru the atmosphere. Issac Newton was one smart dude to know this before our modern way of life.