SpaceX Merlin (& Raptor ) Engine R&D, GPU-Powered

Sai Praneeth
Sai Praneeth

One of the best I've seen.. Adam Lichtl moved onto founding an AI Pattern Recognition startup, and Stephen left to Nvidia as a principal software architect Looks like CFD is getting dead with not much of scope.. Sad to see such an amazing CFD talent not being in use anymore

2 months ago
Raoul Sombrero
Raoul Sombrero

Why does wveryone say Mars is the natural next step? Why not the moon?

3 months ago
The Blasphemous Gospel
The Blasphemous Gospel

Some of the finest engineering porn.

3 months ago
kahlzun
kahlzun

Literally playing KSP in the other window while watching this :)

3 months ago
foo bar
foo bar

this could help a lot in fusion research e.g. stellarator

4 months ago
This is not a rehearsal
This is not a rehearsal

At 0:10 he says "And we were founded in 2012", but the slide says 2002. Oops

4 months ago
Martha Richardson
Martha Richardson

I BET IT IS ONE HELL OF A RIDE UP

4 months ago
Martha Richardson
Martha Richardson

ITS OVER DUE FOR US TO DEVELOP MORE POWERFUL DIFFERENT ROCKET ENGINES, FOR ME THE BLAST-OFF IS MOST THRILLING, THE INTENSE POWER AT BLAST-OFF, IT ONLY TAKES 8 MINUTES TO MAKE ORBIT FROM ZERO MPH TO 17,500 MPH

4 months ago
Bear049
Bear049

The Nozzle should be larger to allow for the use of propellant explosion harmonic energy capture and use

4 months ago
galesx95
galesx95

this is satisfying to watch

4 months ago
Marius Popescu
Marius Popescu

as someone writing a CFD code this was super interesting

4 months ago
John Coppola
John Coppola

brilliant! Nevermind. You can guess the wavelet order desired based on the error tolerance parameter. I like your quote: "Physics is art!"

4 months ago
Dixie Danks
Dixie Danks

What is Dater?

5 months ago
Aalborg Armwrestling
Aalborg Armwrestling

What programming languages do you guys use?

5 months ago
Norrin Radd
Norrin Radd

3D Engine developement used in Sience XD

5 months ago
GreenOwl
GreenOwl

yodabytes. you spelled it wrong.

5 months ago
Bhil
Bhil

Isn't the grid just an Octtree / Quadtree like widely used in 3D/2D physics collision engines used in computer games?

5 months ago
Craig Ripplinger
Craig Ripplinger

Very good work! Wonderful simulation of combustion in a cylinder. I like the references to piston engine simulations - have studied pre-ignition and detonation in engines for decades. In the realm of computing interest, check out the IEEE Spectrum article "Not Your Father's Analog Computer" by Yannis Tsividis, Feb 2018. Best Regards. CR

5 months ago
Keegan Spencer
Keegan Spencer

“Founded in 2012” - slide says 2002 ... little muck up there lol

5 months ago
nizm0man
nizm0man

Rocket science is pretty damn complicated.

5 months ago
Flash Tech
Flash Tech

I did fluid cfd. Very interesting how they could do this with one gpu

6 months ago
Jason Thurston
Jason Thurston

Unfortunately the atmosphere is essentially a vacuum, at least as far as human survival. The moon actually has an atmosphere too.

6 months ago
shayne fitzgerald
shayne fitzgerald

Make a "Fractal" Combustion Chamber and a Fractal Nozzle. That may remove Eddies in the Exhaust Section.

6 months ago
Peaces
Peaces

This is off topic although. I would much rather go home then work on any advanced mathematics. I can not stand math teachers. Math is awesome!!! but I just have hated every math teacher i have had. School's probably alright once you reach collage and tell every one to buzz off and let you do your work, Including your teachers. Any participation based grading system, is obsolete Often teachers grade off wether they like you or not, and wether or not you smile at them, Not wether or not you do your work. though Rocket science requires group effort, It does so on a intellectual and creative basis. not many school environments have such circumstances. And this is without even mentioning that MLA formatting changes each year, and with it so does the language you have to use to explain your mathematical formulas, and you are also graded on Your spelling and sentence formatting in math classes, If our schools and government could get their heads out of their asses and start paying the teachers instead of the principles, And Decide On what is english for once, then it would be a far more conducive environment for proficient learners rather then going back and relearning formatting, One could simply continue to learn.... Anyway this off topic, And the problems of education have nothing to do with rocket science, Have a nice day.

6 months ago
Canard Paa
Canard Paa

Awesome!

8 months ago
Nico K
Nico K

That was like porn, just better.

8 months ago
Nomoreidsleft
Nomoreidsleft

Sorry not drinking that kool-aid. -285 (K/C/F) no matter what is freaking cold. Send Elon Musk there and have him report back.

8 months ago
Robert R
Robert R

Only possibility is F

4 months ago
Nomoreidsleft
Nomoreidsleft

I said -285 (K/C/F) , obviously not kelvins, since -273 is absolute zero.

6 months ago
Krzysztof Łukawski
Krzysztof Łukawski

I wonder where you can get -285 Kelvins. But yes it would be really cold. /s

6 months ago
free thinker
free thinker

This Mars goal is a red herring promoted by our industrial military complex. The real goal is to dominate space. It was the father of rocketry, Goddard, who put forward the the idea that whoever controls space will control the world. NASA and space "exploration" is all about that, not some quest to satisfy our yearning, or curiosity.

8 months ago
PunchAPeach
PunchAPeach

So enlightening, this has boosted my understanding of combustion physics AND data compression AND indexing!!!

8 months ago
Sam McDonald
Sam McDonald

Just an amazing presentation. 👏🏻👏🏻👏🏻👏🏻👍🏻

8 months ago
rickrack78
rickrack78

GTL leads in modeling and analysis of combustion instabilities. The Universal Combustion Device Stability (UCDS™) framework is an energy-based approach developed to quantify the physical processes leading to the emergence of combustion instabilities. This multi-faceted framework can be applied to provide rapid predictions of combustion systems instabilities as well as a method for providing maximum insight from computational and experimental data. https://www.gtlcompany.com/what-we-do/modeling-simulation/#combustion-stability

8 months ago
gacekky1
gacekky1

I wonder if this is what the Russians used when they designed the Soyuz.

9 months ago
Luke Jacobs
Luke Jacobs

God I love you all

9 months ago
Jiansen Zheng
Jiansen Zheng

I just saw "Kerbal Space Program" in one of the slides.

9 months ago
Danny Crofts
Danny Crofts

That's amazing 😍🚀 xxxxx

9 months ago
The Q
The Q

If I ran a space company. I'd make my engineers build engines using the most powerful of fuels. *Yes the toxic ones.* We're talking about liquid fluorine as an oxidizer. And probably some nitrogen-hydrogen compound as the fuel. A reaction such as that which knocks off the hydrogen to be the main driving gas propellant and the nitrogen-fluorine reaction to give that hydrogen the kick in the ass he needs to get the hell out of that engine bell!

9 months ago
Amperzand
Amperzand

David Vermillion, have fun convincing the world to let you build such things. Past a certain point, it's safer simply to use a nuclear drive.

3 months ago
EvRGrN EvRGrN
EvRGrN EvRGrN

Nasa is a MASONIC CULT. Space does not exist. Idiots.

9 months ago
Lensflare Deviant
Lensflare Deviant

EVRGRN - You are sadly just another poor soul doomed to live in a world that you can't understand and will always frighten you.

4 months ago
EvRGrN EvRGrN
EvRGrN EvRGrN

Mosern1977 ... Loads of TRUTH

7 months ago
Mosern1977
Mosern1977

Pretty sure you've got loads between your ears.

7 months ago
Andrew Cliffe
Andrew Cliffe

Brilliant in every way!

9 months ago
Chaim Goldbaum
Chaim Goldbaum

Sparse based octree search, basically how unlimited detail graphics engine works.

9 months ago
Annamaria Caporale
Annamaria Caporale

Can you help me contact Elon Musk please PS I subscribed and liked the video. My eMail is [email protected] if he says yes I have designed a M class rocket motor

9 months ago
Variety_Pack
Variety_Pack

What a boring presentation. So much interesting information, delivered in a voice as exciting as a moldy pancake, with awkward pauses and near-perfect recitation of what's on-screen.

9 months ago
Stephen Kramer
Stephen Kramer

Variety_Pack what a retarded moron making a comment, only pays attention to things that are presented with excitement by other morons!

5 months ago
Marcell D ́Avis
Marcell D ́Avis

Variety_Pack Looks like you accidentally put your comment under the wrong video

6 months ago
System32
System32

like if your Team green "Nvidia" didn't know they help rocket science till now XD

9 months ago
beingatliberty
beingatliberty

why aren't these waves being described by bezier curves would match the original curve much better for less data ?

10 months ago
John Schultz
John Schultz

14 seconds in and the narrator says they were founded in 2012 yet the screen say 2002. How daft will this get as time goes by?

10 months ago
saultube44
saultube44

You need redundant back ups, 3 or 4, on the spaceship you're traveling and several more on steps on the trajectory to Mars, so in case something goes wrong, while traveling or on Mars, you have several resources back ups already in space waiting to move on demand. We need a global economy, be efficient at maximum to be able to explore planets in a sustainable way through worldwide efficiency. Resource Based Economy Message https://pastebin.com/rys5Da9F If not, the greed-based problems of capitalism will be reproduced to where ever we go and we'll have a Expanse Series situation http://www.imdb.com/title/tt3230854/?ref_=nv_sr_1 You might have success your way, but only for an elite that will stab you in the back at their convenience, because capitalism has made them that way, we need to improve morally and socially and politically before colonizing other places on Space, specially when we get to the Asteroid Belt to mine it

10 months ago
j16out
j16out

45 AMD fanboys dislike this

10 months ago
James Brooks
James Brooks

Thank you...

10 months ago
Peter & Pete
Peter & Pete

what a load of rubbish, just words, images, few snippets of actual video and lots of animation! Obviously not gonna go far on this eh?

10 months ago
Amperzand
Amperzand

Peter & Pete this video is about how they create the animation so they don't have to produce as much expensive real footage.

3 months ago
John Robinson
John Robinson

The GCR issue may doom any mission to be tiny or fail unless we have supporting infrastructure on the Moon. But, we'll see.

10 months ago
John Robinson
John Robinson

Three days on the Moon damaged the arteries of the Apollo astronauts. Hybrid shields? Foot-thick lead walls? GCR is a killer...literally.

10 months ago
Goober
Goober

"no computer big enough " there is.... you could use blockchain get the world involved!

10 months ago
Jeremy Ardley
Jeremy Ardley

I wonder if they used STL for the data mapping?

10 months ago
Chameleon Scheimong
Chameleon Scheimong

The thing I love about CFD (or multidimensional calculations in general) is that you can do the math in one dimension, and simply tell the computer to run it three times and more often than not, it will work. As a computer science major undergrad I find that compression algorithm extremely interesting and potentially useful for my upcoming project.

10 months ago
Brad Wilson
Brad Wilson

Very interesting presentation.

10 months ago
magicstix0r
magicstix0r

So SpaceX engines run on kerosene.... So one rocket launch undoes all the good of all those Teslas driving for years? .....

10 months ago
Raptorman0909
Raptorman0909

The annual consumption of fuel in the USA alone is about 172E9 gallons. The Falcon 9 first stage has about 38,843 gallons of RP-1 kerosene. So, it would require over twelve thousand Falcon launches every day to match to fuel use. If we figure 25 launches per year the Falcon 9 will consume about 0.00056% of the fuel used in the USA.

4 months ago
Arthipex
Arthipex

The primary stage contains about 225 tons of fuel - oxygen included. That's nothing compared to what traffic uses every day. A small sacrifice for all the advantages it gives us.

10 months ago
Sany0
Sany0

ok these SapceX ppl are going at it arse backwards......Get to the moon first...establish a base underground (radiation protection)...then build a linear accelerator and fire a spacecraft at mars....no fuel needed unless course correction or until in orbit of mars.

10 months ago
Darren Wu
Darren Wu

2:05 Kerbal Space Program XD

10 months ago
Deadmeatslick
Deadmeatslick

"to melt water"

10 months ago
ThomasHaberkorn
ThomasHaberkorn

17:20 this wavelet compression is very interesting, however, in a simulation, where do you get the initial ("correct") data from if you haven't done a simulation yet? Do you us a complete fine-grid (and slow) simulation first and for different geometries use the same compression nodes or are you using some "educated guess"?

10 months ago
thomas williams
thomas williams

Venus is where you should go. It's closer, you could make it like cloud city in return of the jedi.

10 months ago
Jessie Grabow
Jessie Grabow

Empire, c'mon! Besides, there's an array of problems with dealing with Venus (acid, pressure, no access to metals, etc). Mars is solvable with current tech. Mars needs to be first.

3 months ago
YodaWhat
YodaWhat

+Nice? -- Yes, but the atmosphere of Venus is very massive, about 100 times the density of Earth's, which suggests that the _absolute moisture_ is about 100 times higher than you state. Also, there is Hydrogen in the plentiful Sulfuric Acid droplets there. In other words, Venus has plenty of Hydrogen for making the paltry amount of Methane needed for rockets! Venus also happens to be rather enriched in Deuterium, because it was mostly the regular lightweight Hydrogen (Protium) which got stripped away over the eons, leaving most of the D behind. So if we ever get Deuterium fusion working productively, Venus is also _the place_ to refuel fusion rockets.

4 months ago
Linecraftman
Linecraftman

where would they get water for methane? Venus atmosphere is only ~0.001% water.

5 months ago
Aaron Schwarz
Aaron Schwarz

Combustion Technology Ongoing benefits can be realized in tradition ICE vehicles by further optimization of combustion in reciprocating piston engines that will migrate from their current roles as primary movers to EV enhancing range extender roles in long range battery electric vehicles (BEV's) as onboard internal "combustion" engine range extender generators! Computation simulation enabled complex CAM profiles that enabled VTEC and DOCH functionality with VVTI that was impossible using non-computer optimized production techniques. Computation simulation enabled the development of advanced engine controls that enabled fuel injection, variable ignition timing and advanced emissions controls Computational simulation helps current automakers accelerate the development of self driving car technology Computational simulation enables aircraft designers to optimize wing & aircraft shapes to enhance aircraft control while reducing fuel consumption for longer range & lower emissions Computation simulation of engine combustion enabled the development of direct injection technology or GDI that enhances power output, efficiency & emissions The ongoing advances possible with CAE will enabled artificial intelligence to help engineers select the best system architecture by suggesting novel modifications to all facets of a given design, paving the way forward for more ongoing innovation!

10 months ago
Anchor Bait
Anchor Bait

Founded in 2012 or 2002? Or maybe it was 2008?

10 months ago
TheToric
TheToric

i love how the NASA mars arcetecture picure is just a pic of a KSP replica. i can see nearteas parts in there.

10 months ago
etmax1
etmax1

commentator talks like a child, I hope he does better at rocket science than he does in English :-)

10 months ago
thatGUYbehindthemask
thatGUYbehindthemask

2:38 KERBAL SPAAAAAACE!

10 months ago
Sędziwój
Sędziwój

at 17:12 it not be better to not count distance, but field of triangle make from 2 green 1 blue dot?

10 months ago
Sędziwój
Sędziwój

And if they use Radeon Vega SSG they get more memory, better calculation ;) 16GB (HBM2) + 2TB (SSG)

10 months ago
spinbaldak
spinbaldak

And you guys have the coolest names for your hardware!

10 months ago
Steven Trajkovski
Steven Trajkovski

the cup becomes warmer because the eddy's cause the heat to move from the liquid(coffee which is cooling) into the cup not the cup of coffee your not making sense and experts don't make mistakes when speaking hats why they are experts

11 months ago
Sean Baskett
Sean Baskett

This video is like the rocket nerd equivalent of highbrow supermodel lesbian threesome porn. I love it, I actually learned a good bit about plumbing and combustion dynamics. I'm still a bit blown away that the Raptor is full flow staged. If I remember right, the RD 270 was the only other one that worked on a test stand. How Glushko kept that engine together using NTO and UDMH escapes my comprehension entirely. I wish there was video of it somewhere.

11 months ago
Echoeversky Ü
Echoeversky Ü

Sam McDonald Very stable genius indeed. :3

6 months ago
Sam McDonald
Sam McDonald

Sean Baskett . In all of nerdum you have just reached the status of God in my book. Hibrow lesbian threesome ? Just genius. 😂

8 months ago
Jared Brewer
Jared Brewer

Well that was my entire Master's Thesis in 45 minutes... For any CFD Engineer, this is a great primer.

11 months ago
Michael Takrama
Michael Takrama

yep, great primer till you get started....lol :)

4 months ago
darrick steele
darrick steele

Oh wow! Light bulb went on! I get it now!

Year ago
dango85
dango85

hooooly sheeeeet!!!

Year ago
Dave B
Dave B

Our biggest problem is the incredible noise rocket engines make. There is a start up company that makes mufflers for rockets, called QRocket, its funded using the backers of solar road ways, and technology developed by the spinning solar panel company. For water collection we could use the water seer and transfer energy using Ubeam and the EM Drive. Who wants to donate to my patreon?

Year ago
Mbc ‍
Mbc ‍

To date we have 18 successful missions to date

Year ago
SeanFalloy
SeanFalloy

Did not know what I was clicking on but it was very interesting and I was able to put off the stuff I need to do just a little bit longer.

Year ago
Aaron Risley
Aaron Risley

cool learning that the friction isnt causing re-entry temps but ita the gases being compressed by the shockwave

Year ago
Free Speech
Free Speech

SPACEX is fucking hoax. There are countries spend decade to create engine. And here no name guy with no rocket knowldge creating 4 engine merlin D a week. All just a scam. One mistake all engine would be scrap. Why make engine as though fool proof. I think its all media manipulation. Everything about SpaceX shows me they are a hoax organization for NASA to trick people. SPACEX probably hired NASA employees to do this scam.

Year ago
Tim Allen
Tim Allen

Unfortunately you are almost right! I try so hard to see good in everyone even the bad ! Heres why! "YOU" "ME" and everyone else has had something driven into our brains.....RE: "its called education" SHHH! Don't tell anyone its a secret !   So here is how it works...... Im sure you went to school, " didn't you?"  Sure you did ! or else you couldn't be writing me back!  Ok! so im being a little bit of an ass, don't take it personal though I have a bad habit of that!  Im gonna tell you how I feel about all of this....First one governments!  They have been doing this long before you can imagine ! Think for just a second.......Long ago! OH! lets say over 2017 years! Hey! Isn't that the year? LONGER! "NO" "LONGER!" This shit has been going on "Who the hell knows"  Its called authoritarian! Im better than you attitude! You are probably one of those! Next Religion!  anyone that can go around thinking that theres some guy that's gonna take care of 'ALL' the problems......Yeah "NOT!"  If this was true we'd all be living like a king !HA! HA! We'd live for ever! "BS" Now the last one.... The monetary system!  There isn't much to say but its great to have but this dose'nt work either ! Here is why!    There isn't one of these this that work! They are all a control mechanism that's been around far to long !  We have had shit pounded into our heads so someone can control you and keep you in check!   There not really parasites, they have been told that there the great ones..... YEAH! " WRONG "! I call people stupid! And in some cases me as well!  Not in a bad way, heres why; you can only know what is put in your head.....Do you know everything? We are over populated on earth . We have to find a new place to keep fucking up!  Now I know you don't know everything and I don't either!  So lets try something new here,  first you are NOT going to change shit!    PUT your thinking cap on and lets try to ignore these people you hate!   TRY to make something work, like finding a cure for something!  Or try this  .... there has been a break through to some  pretty fascinating  material!  Its called GRAPHENE! Figure out how to mass produce it and YOU WILL BE A RICH MAN!    Look it up!   I'll tell you a little about it first.   Its 1 atom thick and everyone who has work with it is totally amazed !  It is 200 time stronger than steel , the electric conductivity is so great that the computer your on went from 100 % operating speed to 1000 % operating speed in just 12 years! You see electrons travel across it 1000% fast than the silicon chip we use....OH! wait theres more...!    Because its 1 atom thick its flexible , MORE OK! because it only one atom thick it dosnt weigh anything and even more ....It can used as a filter for water and it can hold a charge for a battery,NOTE : If you were to make a battery out of this and there has been only a few it can hold a charge 100 times better than any battery we have!    Here is the problem!  No one as yet has been able to mass produce it!     LOOK INTO IT!  Now all this is , is graphite ! You know it as a #2 pencil , you know the lead in it!   So  STOP HATEING START STUDING STUPID!    Remember its not a bad word it just means YOU DONT KNOW!               OH! The world is not going to end tomorrow I hope!   One more thing graphene is heat resistant!  Be care how you spell it because its a new word and it can be spelled and spell correct will change the word!

10 months ago
Free Speech
Free Speech

@Tim Allen parasite is part of eco cycle. Parasite bring change through chaos and give impetus. But what we have is too much parasite. Even our stomoach has parasite. There are good and bad. At present jew parasite becoming monopolising all jobs in all western country and almost making the host near death. Israel has to be removed for world to survive. if you allow parasite to have dream of their empire , world is goner. Death and destruction awaits humanity at the hands of jews. No way out. These jew parasites are not enlightened. Once you feed parasite , it thinks it deserve it. Good luck world.

10 months ago
Tim Allen
Tim Allen

I'm somewhat to agree with you and I don't feel it is right that our taxs dollars are being spent properly, and it may be just another way to get your money! All that being said I have one question for you? If you have the answers to how to change the way get control back from the money grubbing people of this planet, please share?  I personally want it to stop! Mean time , please come up with an engine to get out into space because that my friend will give us the true answers!

10 months ago
Free Speech
Free Speech

@SeanFalloy There are many scams in paypal. This one is funny. They give you free money to use like 25 dollar into your account. Then if you use it by any chance they take it from bank. Basically they consider 25 dollar don't exist. I had to close one account because of that and my 100bucks also in there even now. i ordered something 105 thinking 125 in there. They over drafted the bank and pissed me off. Here is another taken from paypal site as well. "I transferred $1000 from my bank account to paypal. My bank has deducted the money and paypal has in fact received it. However, the money is not available to me because paypal claims it is "processing". Funny how "processing" is not covered on the status descriptions. Does that mean loaning my money to otehr banks on short term while keeping it from me? I.e., teporarily stealing it from me? I assumed that paypal had our money because they do - it was transferred electronically and no paper exchanges hands between the bank and paypal. Electronic money can not disappear for days any more than the electrons they are made of. So next I buy something but now PayPal demands a credit card number even though they have my money and when I do, they charge my credit card and they keep my money and the money I deposited that they are keeping from me. This has harmed my reputation since I am unable to pay for an item I comitted to buy yet Paypal has my money. I am planning to file a complaint with the state attorney general and will join any class action lawsuit against Paypal. You don't get to keep my money, interest free and without my permission while you loan it to others. It is time we the people regulate the banks into bankruptsy."

11 months ago
Robert Cartwright
Robert Cartwright

😳

11 months ago
Covalence Dust
Covalence Dust

This amazing. Very interesting and educational. I'd love to see more presentations like these!

Year ago
Caygill's
Caygill's

At 24:30 "the reason of the heating on re-entry is not due to friction of air, but because of compressive heating...". Learned something new here!

Year ago
John Coppola
John Coppola

same here. Made obvious sense after he said it! Adiabatic compression. Same thing happens in your car engine.

4 months ago
233kosta
233kosta

+YodaWhat I'm not. It's got fuck all to do with boundary layers and other than shielding (ablative or otherwise) - there's fuck all you can do about it as an engineer. I would however point out that this radiation is emitted in all directions, not just towards your returning spacecraft. The alternative is that the gas itself gets about 3 times hotter and melts your vehicle.

4 months ago
YodaWhat
YodaWhat

+233kosta -- You really cannot brush off the radiative effects which occur within hypersonic shock situations. The air is dissociated and ionized, which means it is a plasma. All plasmas emit x-rays. In spacecraft re-entry the x-rays are of low energy, but extremely intense. Radiative heating power (megawatts) is proportional to a high power (exponent) of the vehicle velocity. Usually something like 5th power is quoted, but certain aspects of re-entry heating can vary as the 8th power of velocity!

4 months ago
Slartybarfast B
Slartybarfast B

233kosta Thank you very much for your detailed reply. You cleared up my confusion very well. Shockwaves and corresponding compression heating are such an interesting phenomenom. I should be close enough to the Falcon Heavy landing site to hear the triple boom (×2) as it lands soon (hopefully). I'll have a better understanding of the shocks I'll feel when that happens. The Shuttle's double boom was almost commonplace as I grew up under the final 45 miles of their landing approach. I sorely miss those powerful and sometimes unexpected booms announcing their return home. Thanks again!

6 months ago
233kosta
233kosta

+Slartybarfast B Generally speaking - yes, they do. Most of what's inside an ICBM warhead is a hell of a lot less heat sensitive than say 3 hew-mons in a space capsule, so you can put more heat into it without issue. Sticking all the sensitive bits somewhere around the back of one's warhead will also protect them from excessive heating. The philosophy here is completely different. With a manned capsule you're interested in slowing down and eventually stopping, which means you want all the drag you can get anyway. With an ICBM - you want to crash into the enemy, so getting there as fast as possible is quite high on the priorities list. The practical upshot of this is that you spend a lot less time heating up your space vehicle, so even though there's more heat coming in from the shocks - it hasn't got enough time to heat up anything sensitive to the point of failure. Obviously all the calculations for this would have been done in advance, right at the design stage, so the thickness of material, structural design, etc. would have been optimised to allow for the high heat of an oblique shockwave during reentry. It should also be kept in mind that past a certain Mach number shockwaves will detach from a pointy body regardless and that offers some thermal protection, though not quite as much as forcing a detached (normal) shockwave via blunt body. The exact Mach number where shocks detach depends on how pointy one's body is and also whether it's a conical shape or a wedge shape. For more on why it's not too important that you're getting more heat transfer on a missile by having oblique shockwaves look into *transient heat transfer* ;) P.S.: Detached shockwaves are sometimes referred to as "normal" shockwaves as they are at 90 degrees (normal) to the flow direction at least at the stagnation point (where relative flow velocity is zero, static pressure and temperature are highest). Shockwaves attached to a body, coming away in a straight line and at an angle are referred to as "oblique" shockwaves. A key difference needs to be noted between detached shocks and true normal shocks. Normal shockwaves are observed in closed flow conditions (i.e. pipe, engine intake, etc.), where the entire shockwave is normal to the flow. Normal shockwaves form a component of a detached shock directly in front of the stagnation point and due to their characteristics cause a region of subsonic flow to form between them and the body. The normal part of a detached shock is the forward constraint of said subsonic flow, the body is the aft constraint and a Mach line (from 2D flows) forms within the stream around the body and behind the shock, outside which flow is supersonic. The size of the subsonic volume between the shock and the body will have a great effect on the amount of drag produced by the body. Normal shocks also form a large or small part of the aft end of a transonic shock (like say on an airliner's wing), depending on how well the wing is optimised. These are called lambda shocks due to their resemblance to the greek letter. An aerofoil is considered well optimised for transonic flight if the normal component of the lambda shock remains small throughout the airframe's entire transonic flight envelope. In general, due to the characteristics of normal shockwaves, any other shockwaves which contain a significant normal component are referred to as "strong", while those which do not are referred to as "weak". The reason normal shocks are considered "strong" is because a lot of compression takes place within them, heating the gas much more than a weak (oblique) shock and slowing it down to a subsonic speed. Coincidentally, the faster one's gas is travelling above the speed of sound - the slower it comes out on the other side of the shockwave. Normal shocks are an intrinsic part of the flow system of any ramjet engine, adding a significant final stage of compression and slowing the gas down to subsonic speed for mixing and combustion. Due to the excessive entropy of normal shockwaves, scramjet (Supersonic Combustion RAMJET) designs omit them altogether, opting instead for supersonic mixing and combustion, in the interest of efficiency.

6 months ago
Adam -亚当-
Adam -亚当-

I am skeptical at just how easy it will be to compress the CO2 in the martian atmosphere. I really hope the surface numbers turn out to be higher.

Year ago
Jessie Grabow
Jessie Grabow

Compress it how? For what purpose? We can easily compress it with pumps.

3 months ago
YodaWhat
YodaWhat

It helps A LOT that the Martian CO2 starts out cold... It is denser (helps to limit the compressor 1st stage size) and will not be as hot during compression (intercoolers will be dumping heat into a much colder heatsink than on Earth). Still, beginning at 1% of Earth-normal pressure is a challenge akin to inflating a truck tire with what is sucked out of a vacuum chamber. :O

4 months ago
NathansHVAC
NathansHVAC

Adam -亚当- it is easy with centrifugal compressors.

10 months ago
Farras Fars
Farras Fars

3.22 kerbal space program

Year ago
John Roach
John Roach

An open system will allow different physics to exist. U need the same velocity reference so u get extremely high velocity by not using conservation of Momentum . This is good for getting into orbit, but the hard part is constant acceleration and only electricity. Forget Newton he is a knockoff.

Year ago
John Roach
John Roach

U can send up 10 or more units that will hock themselves together. Use AI. Russia did this years ago.

Year ago
John Roach
John Roach

Mass exhaust is to slow in space. But your other stuff is good. In space use closed system so u can use F = Ma not conservation of momentum.

Year ago
Amperzand
Amperzand

John Roach, that is literally what conservation of momentum is.

3 months ago
Vita Nova
Vita Nova

I like to think of the maximum sampling frequency as the Planck length of the simulation, huh Elon :)

Year ago
David Parry
David Parry

18:00 - Bad news. Your Wavelet Compression Algorithm, as described, has a major flaw. I now worry about SpaceX engineering. These SpaceX videos make me more nervous about their future everytime I see one. Enjoy.

Year ago
David Parry
David Parry

01:00 - One minute in already some slight issues. _"...we launch satellites for customers..."_ should read _"we _*_blow up_*_ satellites for customers..."_ and _"...we send the Dragon capsule to resupply..."_ should read _"...we _*_blow up_*_ the Dragon capsule _*_on route_*_ to resupply..."_ You're welcome.

Year ago
Raptorman0909
Raptorman0909

I wonder what happened to David Parry in the last year. I wonder if he's so kind as to update his analysis.

4 months ago
Mattias Gyllenvarg
Mattias Gyllenvarg

They are all liquid fuel.

10 months ago
Tim Allen
Tim Allen

Sounds to me, someone took some toys away from you! And now your pissst! You say you design machines? So i'm interested , what type and did someone step on your toes because yours wasn't picked? No i'm not just for Elon ! What brought me here was the engine ! I do have a question about these engines? Are all of them a solid fuel rockets, and why solid fuels, and is this because of Government reasons we use solid fuels?   Why not other fuels?

10 months ago
David Parry
David Parry

+YouCubed22 Elon makes me laugh with his firework displays. The yellows and reds are pretty. I'm too busy designing Machine Intelligence applications. I don't have time to play with rockets...

Year ago
YouCubed22
YouCubed22

David Parry if you hate spaceX so much why dont you invent a better rocket to take out their market share, go sell to to the Russians or the Japanese and stop wasting your time with the low-type Elon Shaped pillow huggers like myself?

Year ago
David Parry
David Parry

Simulation? GPUs? Floating Point? And you're intending to strap living americans to this thing and light it? Great. Cool. Wonderful. I've always wanted to see a cloud painted with americans and a fireball...

Year ago
nan3r
nan3r

David Parry Ah, but I've seen that already. It was called the Challenger. Remember that? I do believe that was NASA, however, iirc. What an upright, ethical decision to launch... I suggest getting your head out of your ass.

11 months ago
45445 Angels
45445 Angels

just like russians uses giant matchsticks to light theirs

Year ago
David Parry
David Parry

Why don't they show the ones that blew up in their ads?

Year ago
nan3r
nan3r

Like how NASA should show videos of the Challenger incident when they talk about their success and ethical practices, right? Point being, all companies/agencies involved have experienced major failure at one point or another. It is part of development. The risks associated with Spacex's failures, however, are nothing in comparison to those taken in the past by space agencies

11 months ago
Exzcellion Gamma
Exzcellion Gamma

Also while I do think showing up explosions of their rockets is cool and all for an ad, I don't think it does when you want to promote your rockets' efficiency or safety. Remember, we have a 'Never Live it Down' side. One or few mistakes define who you are [even if wrongly], no matter what you might accomplish next.

Year ago
Exzcellion Gamma
Exzcellion Gamma

Take it easy will you? I see you all around here. They fcked up, yes... in Materials Science for this one: That static fire anomaly was due to COPV's structure being layered as permeable aluminum inner lining and impermeable carbon overwrap. This container buckles slightly due to high pressure but there' no real issue against this, except for one thing no one knew about without delving deep into Materials Science. Liquid helium is kept inside COPVs to maintain pressure in the LOX (Liquid oxygen) tank. When pressurized LOX is in the tank, some of the LOX seeps in the aluminum lining and gets trapped into the voids generated by the buckles. Since liquid He is colder than LOX, LOX solidifies (turning to SOX as RSs would call them) and is ignited by friction ignition with the linings. But they didn't need to show it up here either when you can file a more detailed report about this on paper.

Year ago
David Parry
David Parry

+TheKSPDesigner​​ So if the gas _'leaked through the atomic structure of the metal'_ you're suggesting they fucked up and used the wrong material to build a gas tank? Are all your excuses this weak?

Year ago
David Parry
David Parry

SpaceX have had several failures; both pre- and post-launch. Which part of the exploding 2nd stage fuel tank issue do you not attribute to SpaceX? Please clarify your comment. Thanks in advance.

Year ago
greg liako
greg liako

Hey cool! Can you upload the jet engine openfoam file in github?!

Year ago
Dario Delgado
Dario Delgado

I like the part about hydrogen combining with oxygen, all the equations, good to see in depth thermodynamics

Year ago
Christopher Cook
Christopher Cook

"When the pioneers went across the united states, they had infrastructure"Not True! you are forgetting the first American western explorers, Lewis & Clark.they traveled light - they lived off the land and used the recourses available. What you are doing is an injustice to not only the people you are informing, but also to history. SpaceX has the ability to send missions to Mars now...with the rocket capacity at their disposal...how? Mars Direct!https://youtu.be/zlxaa-ai1bshttps://en.wikipedia.org/wiki/Mars_Directin the expansion westward, we did not take massive towns and supplies, it was a small trickle of resources and time.

Year ago
Christopher Bloom
Christopher Bloom

Christopher Cook Luis and Clark had native Americans helping them on their trip.

Year ago
David Parry
David Parry

+izzad ibrahim No. You first, Madam.

Year ago
izzad ibrahim
izzad ibrahim

+David Parry fuck off david.

Year ago
David Parry
David Parry

+izzad ibrahim Izzad? No thank you, Miss.

Year ago
izzad ibrahim
izzad ibrahim

David Parry fuck off david

Year ago
John Smith
John Smith

The second you mentioned KSP, I was booting KSP, and that image answers my short term stay problem. How coincidental.

Year ago
Jeffrey Marshall
Jeffrey Marshall

What a great laymans explanation of the wavelet transform (as perceived by a layman)! I'd love to take some time to play with this in another context (doing map generation based on physical process simulation for games).

Year ago
Ima SuperPerson
Ima SuperPerson

Too bad smart guys are so bad at communicating their thoughts in "normal" terms. This guy is very much impressed with himself, but doesn't really give a fuck about his audience. It's not hard to convert techno-babble into English, but one does have to TRY.

Year ago
Michael Hill
Michael Hill

I understood it just fine. Perhaps you weren't the intended audience.

10 months ago
Ima SuperPerson
Ima SuperPerson

This really did bore the fuck out of me, and I helped build the ISS. LOL. Damn, this guy wouldn't last 5 minute in a real NASA meeting, because he's failing to communicate. He's just spewing a bunch of technical nonsense that no one in the room knows or gives a shit about. He lost me about 5 minutes in. Even at NASA, you have to speak to your audience. It's not just like talking in the mirror.

Year ago
Ima SuperPerson
Ima SuperPerson

Rock on SpaceX! Keep up the great work and keep developing. You guys are doing a great job, and we need you to keep us moving forward.

Year ago
Suyash Sharma
Suyash Sharma

You say the biggest hurdle is Radiation and then you explain the deltaV and the trajectory. Like no mention to the Van Allan belt and the radiation that can't be overcome midway between earth and mars.

Year ago
dxguy
dxguy

Listen again. The entire challenge to minimize radiation exposure is to select the right transfer orbit(s) so that a "window" of acceptable human exposure is met. This is one of the major consideration in selecting thrust / orbits.

Year ago
JP Montello Dr.Phosphorus
JP Montello Dr.Phosphorus

What is the theoretical maximum Isp from a near stiochiometric mixture of LOX and RP-1? I assume that as you approach the stiochiometeric mixture the Isp increases with a drawback of combustion instability.

Year ago
Ima SuperPerson
Ima SuperPerson

Mad?  lol  No, I'm not mad.  I'm trying to understand who you're asking here, and why?  If you have questions about combustion, etc., why not address it to some of the engineers at SpaceX?  I'm sure they know.

Year ago
JP Montello Dr.Phosphorus
JP Montello Dr.Phosphorus

+Ima SuperPerson no seriously it's a real issue. no joke, not kidding. combustion instability in terms of detonation vs a smooth deflagration. If you keep getting mad I'm not going to respond.

Year ago
JP Montello Dr.Phosphorus
JP Montello Dr.Phosphorus

+Ima SuperPerson you're supposed to be a bit of a know it all to be successful in the aerospace industry. that's just how it is because it's complicated information

Year ago
Ima SuperPerson
Ima SuperPerson

42. That's your answer, now go away and get that condition treated.

Year ago
JP Montello Dr.Phosphorus
JP Montello Dr.Phosphorus

I mean it's typically better to be fuel rich anyways because fuels tend to have a lower MW than oxidizers and non corrosive to the metals

Year ago
tmusic99
tmusic99

at 39:02 Are errors in boundry condition assumtions critical in this application ? Sensitivity analysis? Just proactive modeling or do you drive multiresponse performance ?

2 years ago
Ryan Ballantyne
Ryan Ballantyne

Pretty sure you have to pay to hear this kind of stuff in college...amazing

2 years ago

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