Is SpaceX's Raptor engine the king of rocket engines? 

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00:00 - Intro
02:55 - Basic physics of rocket engines
06:10 - Rocket engine cycles
20:30 - Rocket fuel comparison
30:40 - Raptor vs other rocket engines
44:05 - Summary
Article version - everydayastronaut.com/?p=9823&preview=true
SpaceX's new raptor engine is a methane fueled full flow staged combustion cycle engine and its so hard to develop, no engine like this has ever flown before!
Now this topic can be really intimidating so in order to bring the Raptor engine into context, we’re going to do an overview of a few common types of rocket engine cycles then compare the Raptor to a few other common rocket engines, like SpaceX’s current work horse, the Merlin, The Space Shuttle’s RS-25, the RD-180, Blue Origin’s BE-4 and the F-1 engine.
And if that’s not enough, not only is SpaceX using a crazy engine cycle, they’re also going to be using Liquid Methane as their fuel, again something that no orbital rocket has ever used! So we’ll also go over the unique characteristics of liquid methane as a rocket fuel and see if we can figure out why SpaceX went with Methane for the Raptor engine.
We'll also break down and explain all the different engine cycle types so you know what the full flow staged combustion cycle is, how it works, and how it compares to the other cycles.
So by the end of this video hopefully we’ll have the context to know why the raptor engine is special, how it compares to other rocket engines, why it’s using methane and hopefully find out if the Raptor engine will be the new king of rocket engines…
Rocket engine renders by @MartianDays MartianDays
F-1 Turbopump photo provided by Mike Jetzer/heroicrelics.org
HUGE thanks to my Moon Walker Patreon supporters! Blake Jacobs, Eli Burton, Jethro, Mac Malkawi, Neurostream, Ole Mathias Heggem
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Publicēšanas datums


25 mai 2019






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komentāri 100   
Vitaliy Pirms 22 Minūtes
Nice T-Shirt at the beginning of the video ! :)
Manuel Verdugo
Manuel Verdugo Pirms 53 Minūtes
Manuel Verdugo
Manuel Verdugo Pirms 54 Minūtes
reusability is a Yoke. rebuild merlyn fore flight is +50%, all raptor are only one flight and BOOM!
GhostNade Pirms 7 Stundām
I hope this video doesn't fall into hands of Romulans.
Mist Pirms 11 Stundām
Watching this one after the SN10 launch
James Howarth
James Howarth Pirms 16 Stundām
mau lwong fang
mau lwong fang Pirms 19 Stundām
If you can remember, The only fuel ready to use in space is this methane, and several gás station is avaylable along all solar system like some moons....
Darkex Pirms 23 Stundām
Raptor engine went well on the new sn10 test launch
TimesWatcher Pirms dienas
Fantastic job! Thank you!
Toaster Pirms dienas
i feel 100% more smarter than Steaven hawking
John Czipoth
John Czipoth Pirms dienas
most all propulsion are either solid liquids or gas why not plasma?
C G Pirms 2 dienām
Awesome video. Extremely well made and presented.
Tatiana Racheva
Tatiana Racheva Pirms 2 dienām
Wait, do you have heterochromia? I always notice hazel eyes, but then I see you only have one :)
A Hm
A Hm Pirms 2 dienām
Very very useful video, thank you very much
Nicolas Broodryk
Nicolas Broodryk Pirms 2 dienām
Outstanding video. Thank you 🙏
Scuba Pasta
Scuba Pasta Pirms 2 dienām
Watched it all even tho- I have no many ideas about this.
Tobias Lu
Tobias Lu Pirms 2 dienām
Wait, do u have heterochromia?
Great t-shirt dude!
Ra V
Ra V Pirms 3 dienām
Tim, you got any degree?
Will Hofner
Will Hofner Pirms 4 dienām
I've never felt more drawn to join a patreon for a yt channel than I am for this one. Truly inspiring stuff
Ethnicjunkie Pirms 4 dienām
I searched the last song in this video in the Maximum Aerodynamic Pressure Album but I couldn’t find it!! Does anyone knows what’s that last song?
Ethnicjunkie Pirms 4 dienām
By the way... this is an amaaaazing video
Michael H.
Michael H. Pirms 4 dienām
Forty-nine (49) minutes is NOT a long video! Additionally, the F1 was fired muntiple times before actual use. COULD it have been used multiple times? Very probably, yes.
God Slayer
God Slayer Pirms 4 dienām
Ego Bezos had better hope that Elon Musk doesn't ever decide to create an online marketplace
nagantm441 Pirms 4 dienām
Rd-170 flew more than the f1 on the zenit...
Roman Matveev
Roman Matveev Pirms 4 dienām
Great video, Tim! Watched it twice with the same amount of joy!!!
Will Hofner
Will Hofner Pirms 4 dienām
This channel is incredible
SPG 12
SPG 12 Pirms 4 dienām
Why does the engine bay light on fire when the engines flame out?
Roman Matveev
Roman Matveev Pirms 4 dienām
Russian engine RD-0120 (which powered Energia rocket) is *equaly* efficient as RS-25. They have almost the same weight, same impulse (RS-0120 just a little bit more efficient in vacuum but samely less efficient at sea level). Juts on prise definitely goes to RS-25 - its thrust is 12-15% ahead of Russian rival
Hanuscsak Illes
Hanuscsak Illes Pirms 4 dienām
Aaaannndd... This is why sn10 exploded
J.C. Schaumleffel
J.C. Schaumleffel Pirms 4 dienām
The teacher I never had
gk Pirms 5 dienām
Thank you for using SI units. This way, non-Americans finally know what you are talking about. Sadly, NASA is still using the horrible incoherent american unit system in its hp and videos. :(
Le Lad
Le Lad Pirms 5 dienām
ThunderF00t would just scream that these are all lies
Sambit Sahoo
Sambit Sahoo Pirms 5 dienām
Recommended right after SN10 goes KaBOOM!
Christian Rodriguez
Christian Rodriguez Pirms 5 dienām
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c g
c g Pirms 5 dienām
“I can’t even fathom”. This man is a beast..
Tony Almeida
Tony Almeida Pirms 6 dienām
1:42 I noticed... I'm scared... but I'm prepared...
Christopher Vogel [Virgin Valley HS]
Nice, very well explained. I am part of a nuclear monitoring organization in Nevada. As part of our training we spend a lot of time Talking to the scientists who worked at the nuclear teat site. One of the most interesting lectures was about the nuclear rocket program from the late 50's and into the 60's. While I don't remember the exact numbers, I know that they ran test engines for HOURS at specific impulses of around 900 sec. That is amazing considering the raptor has a theoretical max of 370 sec with a very limited burn time. I have heard that Rolls Royce is still looking into this technology.
John Brunner
John Brunner Pirms 6 dienām
Please do an in depth look at the Nuclear Salt Water propulsion system which can get us from Earth to Mars in weeks not months.
Tabitha Bailey
Tabitha Bailey Pirms 6 dienām
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TecSanento Pirms 7 dienām
Do they actually push liquid methane into the combustion chamber or is it gasified by the time it reaches the combustion chamber ?
matthew fitzpatrick
matthew fitzpatrick Pirms 7 dienām
Thank you.
Senna Pirms 7 dienām
Question for anyone. What if Elon made a star ship that did not come back from space by that I mean the starship only has a detachable lower engine or lower ring. What amount of the starship could used. The other question I have is what type a size and shape could be fitted by the heavy lift rocket. Could This be larger that the starship. What would you place on the heavy lift rocked.
Electric paisy
Electric paisy Pirms 8 dienām
Three Questions: 1. How does oxygen exhaust gas melt everything away when the only reason to run rich is to cool stuff down and why doesn't it happen when fuel rich? 2. How can this advanced engine with two pumps and the special alloy for the oxygen rich side be almost as cheap as the open cycle Merlin? 3. 43:08 but didn't two Merlins fail firing back up on the center booster of the falcon 9 heavy test for the deceleration burn?
Hello World
Hello World Pirms 8 dienām
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Lostmacs Failprofi
Lostmacs Failprofi Pirms 8 dienām
Is it okay to use this as sleepcast?
Sam Becker
Sam Becker Pirms 8 dienām
I very much enjoyed your video Tim Dodd. I can see that everything we design, build and reuse here on Earth has your explained ripple effect. You certainly have some things in common with Elon Musk with your completeness in comparison. I thought maybe you worked for Space-X, I goggled you after the video. I liked your video @100K thumbs up display. That puts me in Liked your video 101. Wow you have 2K competitors, because I'm sure that's not your audience. :)
Robert Frank
Robert Frank Pirms 9 dienām
Has Merlin beat the RS25 in flight record?
Carter Etherington
Carter Etherington Pirms 9 dienām
Best 49 minutes I've ever spent!
Jason Wethers
Jason Wethers Pirms 9 dienām
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Lisabeth Low
Lisabeth Low Pirms 11 dienām
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Michael Pirms 11 dienām
Its kinda funny watching this now with all the problems raptor has had in spacex SN test fires and launches. No offense Tim, but take a step back and dont give a crown award to somebody who hasnt even had the device plugged in working in an actual vehicle. Everybody on YT is rushing, falling over themselves to give Elon the medal before he has even done anything.
a_minorr Pirms 11 dienām
20 dollars for 1,000,000 Newtons? T h a n k s
Greg Lialios
Greg Lialios Pirms 12 dienām
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Andre bustos
Andre bustos Pirms 12 dienām
Cuando saca increase the enthalpy su nuevo álbum
Bender81 Pirms 12 dienām
Nice shirt. Oh, and video too
A Matías Quezada
A Matías Quezada Pirms 12 dienām
We have progressed so much in 2 years
Sukacita Yeremia
Sukacita Yeremia Pirms 13 dienām
You know how rocket engines work. But how do they control the throttle?
Charles Fox
Charles Fox Pirms 13 dienām
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Three Haks
Three Haks Pirms 14 dienām
Do you know that you have different colored eyes>]\?
Maggie B
Maggie B Pirms 14 dienām
My head hurts but at least I learned something
Shannon McStormy
Shannon McStormy Pirms 14 dienām
When discussing the Airships and how "unsafe" they are, realize that today we fly with wings filled with jet fuel......
Lausy Maus
Lausy Maus Pirms 14 dienām
Doesn't he say:" this vids long" everytime? Are there short vids? Do they exsist?
Lausy Maus
Lausy Maus Pirms 14 dienām
@Everyday Astronaut um.... thanks for responding!!! really informative videos, you and scott manly are my youtube-space-heaven :) i guess i should have formed my question as: Dont you say:" this video is going to be long" everytime. Greetings from a german fan btw!
Everyday Astronaut
Everyday Astronaut Pirms 14 dienām
They used to 😂
Space and Nature
Space and Nature Pirms 14 dienām
I've learned soo much, THANK YOU
Dennis Lindqvist
Dennis Lindqvist Pirms 15 dienām
The question is whether it will ever be possible to send humans to Mars without it becoming a suicide mission?
Abseiduk Pirms 15 dienām
Was the fathom pun intended?
ce sneaks
ce sneaks Pirms 15 dienām
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Damp was not
Damp was not Pirms 16 dienām
37:15 wow ;)
Damp was not
Damp was not Pirms 16 dienām
This dose not work lol
Damp was not
Damp was not Pirms 16 dienām
11.46 wow ;)
magnetoflyer Pirms 16 dienām
hi, can i use you video to explain raptor engine in my wesite . I'll ask them subscribe you channel in return.
Luis Pires
Luis Pires Pirms 17 dienām
Tim, we need a recap on the raptor!
EthanGBB Pirms 17 dienām
Wasn’t there a engine being developed by the USSR that was a full flow staged combustion engine that ran on methalox?
JC_from_TX Pirms 18 dienām
Now we just need the Epsetin drive...
Jay B
Jay B Pirms 18 dienām
30 minutes in and just realized dudes eyes are different colors
08yallvon Pirms 18 dienām
8:16 the inly thing I did not understand was “pressure always flows from high to low” rest was a piece of cake
Kharmitas Pirms 18 dienām
A simple explanation of that can be summarized like this: pressure is energy. Take a liquid propane tank as an example - propane is not normally a liquid at room temperature. It doesn't become a liquid at room temperature unless it's upwards of six times as pressurized as the atmosphere of earth at sea level. Propane stored in a tank has to be pumped into that tank using an immense amount of energy to force it into a liquid state - and aside from the energy lost to thermal inefficiency, all of that kinetic energy is stored as potential energy in the propane, which is in the tank. That's why the tank needs to be thick steel - if it weren't strong enough, the physical force used to push the propane into the tank would just burst the tank and the propane would revert to being a heavier than air gas. When you open the valve of the propane tank, the propane boils as the potential energy stored in the form of pressure turns back into kinetic energy and forcefully ejects the gas left when the propane boils into the outside of the tank. It can do this because the propane in the tank has more potential energy than the atmosphere outside of the tank - in order for things to be stable without a steel wall and without supercooling the propane, the atmosphere and propane both need to have the same amount of pressure - the same saturation of potential energy. If you stuck a full, room temperature propane tank into an environment with 14 atmospheres of pressure, which is about the max we actually find in propane tanks, then opened the valve... liquid propane would pour out, because the potential energy saturation inside and outside the tank are the same. The propane does not possess enough energy to boil in that environment, because it's not hot enough to reach its boiling point at that pressure, let alone to supply the latent heat of evaporation. Side note: that latent heat of evaporation is why when propane vaporizes, it's really cold, and why it heats up while it's being compressed - boiling in and of itself takes energy beyond what's needed to reach the boiling point, and condensing into a liquid frees up the energy that was spent boiling in the past. This is also how refrigerators work - if you use a machine to forcibly alter the pressure of a chemical with properties similar to propane, you can force it to absorb heat from inside the fridge in order to boil when you lower the pressure, then after you move it further from the inside of the fridge you can forcibly compress it, which pushes the heat it absorbed while boiling into your house. Then the cycle repeats as the re-liquified refrigerant is pushed back into the part of the refrigerator where it boils. Propane is even used as a refrigerant in some cases.
Fletcher Kirby
Fletcher Kirby Pirms 18 dienām
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Luke Andris
Luke Andris Pirms 18 dienām
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Robin K
Robin K Pirms 18 dienām
"lighter than air"
Dagfinn Sevecke
Dagfinn Sevecke Pirms 18 dienām
Does the thrust to weight ratio help when the rocket is fully fuelled?
Steve Acho
Steve Acho Pirms dienas
It's a factor, but as he explained, other factors include the energy of the fuel, the amount of oxidizer that must be carried, and the weight of the fuel tanks to contain the pressure of the fuel. All of those create different challenges that add to the weight of the rocket.
diniito toom
diniito toom Pirms 18 dienām
Dont forget to watch rover landing on mars today🤩
Kuganesan Thanansan
Kuganesan Thanansan Pirms 20 dienām
Trevor Pullen
Trevor Pullen Pirms 20 dienām
I have to go back and re-watch this video every few months. It makes more sense every time.
Наталья Кондратенко
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Mia A
Mia A Pirms 20 dienām
Great video!
Randy P
Randy P Pirms 21 dienas
Twixx Pirms 21 dienas
rocket scientists: NOOO YOU CANT SAY THIS ROCKET ENGINE RUNS ON FART😭😭😭!!! me: haha fart rocket go brrr
Dominik Schwarzer
Dominik Schwarzer Pirms 21 dienas
I feel smart now. Thank you! And interesting how quick this video is outdated. Only 2 years later there have been astronomical improvements! I'll check your channel for an update!:)
Rusell Jann Dela Cruz
Rusell Jann Dela Cruz Pirms 21 dienas
Am I the only one who noticed that this guy's eyes have different colors? one is green and the other is brown? seems like rocket fuel! XD Kiddin'! Great content Man!
Timothy HYF
Timothy HYF Pirms 22 dienām
Thank you very much for this rich and free video
Greg Lialios
Greg Lialios Pirms 22 dienām
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Wolfango De Francesco
Wolfango De Francesco Pirms 22 dienām
Bravo 👍🏼
Kenneth Gray
Kenneth Gray Pirms 22 dienām
( ^_^)/ Pointy end up, flamey end down.
David Steigerwald
David Steigerwald Pirms 22 dienām
This was an awesome presentation, thanks so much for the education. Sorry to see the charts haven't been updated yet on the web site, as referenced months ago by other posters.
MR. METHANOLOGY Pirms 22 dienām
Methane is the next generation propellant and important step to liquid renewable e-Methanol
TKwyo12 Pirms 23 dienām
amazing content thank you!
семен семенов
семен семенов Pirms 24 dienām
Как оно летает это НЛО? Далеко ли, как его усовершенствовать?
Scorpion ZX
Scorpion ZX Pirms 24 dienām
Floriduh Man
Floriduh Man Pirms 24 dienām
Really long... 49 minutes...
Yataka Pirms 25 dienām
1:00 please where i can find this t-shirt ??
zlatko cargonja
zlatko cargonja Pirms 25 dienām
Why polute? Put a windmill on top of the rocket and have it go
Kelly Besuijen
Kelly Besuijen Pirms 25 dienām
why dont they use mechanical energy launch. catapult or rail gun kinda thing
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