oh god be4 looks terrible compared to raptor 3. It’s huge, heavy, less powerful and not as efficient.
LPNTed on
If the graphic sizes are relatively to scale…… Raptor 3 V. BE-4…. HOLY FUCKING FUCK!
PckMan on
You frgot Intuitive Machines’ VR900
Frodojj on
There are three types of Raptor in addition to those versions. Vacuum raptor is optimized for vacuum operation. It has better isp because of its larger engine bell. There is also a stripped down version that is used on the booster’s outer edge that doesn’t gimbal and uses connections in the launch mount to start the engines. It weighs a lot less than the standard version. All three types have different specs. Which one’s specs are you including there, or are they mixed together?
Decronym on
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:
|Fewer Letters|More Letters|
|——-|———|—|
|[BE-4](/r/Space/comments/1f0vp0p/stub/ljv4098 “Last usage”)|Blue Engine 4 methalox rocket engine, developed by Blue Origin (2018), 2400kN|
|[ESA](/r/Space/comments/1f0vp0p/stub/ljv0hxs “Last usage”)|European Space Agency|
|[ISRO](/r/Space/comments/1f0vp0p/stub/ljv3eet “Last usage”)|Indian Space Research Organisation|
|[Isp](/r/Space/comments/1f0vp0p/stub/ljv4098 “Last usage”)|Specific impulse (as explained by [Scott Manley](https://www.youtube.com/watch?v=nnisTeYLLgs) on YouTube)|
| |Internet Service Provider|
|[RP-1](/r/Space/comments/1f0vp0p/stub/ljv4agm “Last usage”)|Rocket Propellant 1 (enhanced kerosene)|
|[SLS](/r/Space/comments/1f0vp0p/stub/ljuq20d “Last usage”)|Space Launch System heavy-lift|
|Jargon|Definition|
|——-|———|—|
|[Raptor](/r/Space/comments/1f0vp0p/stub/ljv1qhj “Last usage”)|[Methane-fueled rocket engine](https://en.wikipedia.org/wiki/Raptor_(rocket_engine_family)) under development by SpaceX|
|[Starlink](/r/Space/comments/1f0vp0p/stub/ljuzhcp “Last usage”)|SpaceX’s world-wide satellite broadband constellation|
|[hypergolic](/r/Space/comments/1f0vp0p/stub/ljv4agm “Last usage”)|A set of two substances that ignite when in contact|
|methalox|Portmanteau: methane fuel, liquid oxygen oxidizer|
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14 Comments
[Here](https://www.reddit.com/r/SpaceXLounge/comments/1eyn7gs/comparison_of_methane_rocket_engines/) are the sources of information.
Ahh… the usual big three: USA, China & New Zealand…
I’ve never seen anything that didn’t make me think Blue Origin and Jeff Bezos suck at space.
The engine with the longest development, while having the highest thrust is basically losing in all other areas.
Prometheus Engine (ESA)
https://en.m.wikipedia.org/wiki/Prometheus_(rocket_engine)
* Thrust, sea-level
980 kN
* Chamber pressure
100 bar
* 360 s specific impulse
* start of development: 2017
You are missing Prometheus https://en.wikipedia.org/wiki/Prometheus_(rocket_engine) and the Long March 9 one.
oh god be4 looks terrible compared to raptor 3. It’s huge, heavy, less powerful and not as efficient.
If the graphic sizes are relatively to scale…… Raptor 3 V. BE-4…. HOLY FUCKING FUCK!
You frgot Intuitive Machines’ VR900
There are three types of Raptor in addition to those versions. Vacuum raptor is optimized for vacuum operation. It has better isp because of its larger engine bell. There is also a stripped down version that is used on the booster’s outer edge that doesn’t gimbal and uses connections in the launch mount to start the engines. It weighs a lot less than the standard version. All three types have different specs. Which one’s specs are you including there, or are they mixed together?
Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I’ve seen in this thread:
|Fewer Letters|More Letters|
|——-|———|—|
|[BE-4](/r/Space/comments/1f0vp0p/stub/ljv4098 “Last usage”)|Blue Engine 4 methalox rocket engine, developed by Blue Origin (2018), 2400kN|
|[ESA](/r/Space/comments/1f0vp0p/stub/ljv0hxs “Last usage”)|European Space Agency|
|[ISRO](/r/Space/comments/1f0vp0p/stub/ljv3eet “Last usage”)|Indian Space Research Organisation|
|[Isp](/r/Space/comments/1f0vp0p/stub/ljv4098 “Last usage”)|Specific impulse (as explained by [Scott Manley](https://www.youtube.com/watch?v=nnisTeYLLgs) on YouTube)|
| |Internet Service Provider|
|[RP-1](/r/Space/comments/1f0vp0p/stub/ljv4agm “Last usage”)|Rocket Propellant 1 (enhanced kerosene)|
|[SLS](/r/Space/comments/1f0vp0p/stub/ljuq20d “Last usage”)|Space Launch System heavy-lift|
|Jargon|Definition|
|——-|———|—|
|[Raptor](/r/Space/comments/1f0vp0p/stub/ljv1qhj “Last usage”)|[Methane-fueled rocket engine](https://en.wikipedia.org/wiki/Raptor_(rocket_engine_family)) under development by SpaceX|
|[Starlink](/r/Space/comments/1f0vp0p/stub/ljuzhcp “Last usage”)|SpaceX’s world-wide satellite broadband constellation|
|[hypergolic](/r/Space/comments/1f0vp0p/stub/ljv4agm “Last usage”)|A set of two substances that ignite when in contact|
|methalox|Portmanteau: methane fuel, liquid oxygen oxidizer|
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ISRO is also building a metholox engine, I think. but there’s not much info about it in public.
Edit: They already tested a 20ton prototype a few years ago. https://youtu.be/DyU9cUbY8Bg?si=D2-r1-qT_tu1aIdl
I thought these were chess pieces before zooming in
What is the source on BE-4 Isp? Blue hasn’t released numbers but the estimate on Wikipedia is 340 s
Ok, now all we need is a repurposed spinning orbital hotel to bolt some of these onto and we’re go for Mars.