• Sign in to Neowin Faster!

    Create an account on Neowin to contribute and support the site.

Sign in to follow this  

SpaceX Interplanetary Transport System (updates)

Recommended Posts

DocM    16,651

BOTE, I'm guessing about 15 meters wide by 75-80 meters tall for the BFS lower stage. Betting BFS will be both the upper stage and the vehicle.  A 4:1 aspect ratio would make BFS about 60 meters long, which means a stack 135-140 meters tall.

  • Like 1

Share this post


Link to post
Share on other sites
Unobscured Vision    2,682

Yep. 15 meter hull, likely vertical assembly. No way they'll be able to do an erector from horizontal with something this size, even dry mass.

  • Like 1

Share this post


Link to post
Share on other sites
DocM    16,651

And no way is it a 10-13 meter hull. It'd take a stack 150 meters (~500 feet) tall to hold the propellants, and there's not enough base area to hold 20+ engines with 4.2 meter nozzles.

  • Like 1

Share this post


Link to post
Share on other sites
DocM    16,651

Looking like a ~4 meter nozzle for the vacuum Raptor, and just under 2 meters for the sea level Raptor.

 

The combustion  chamber won't be much larger that a Merlin 1D's, more than 3x the pressure, but that dual multi-staged pumping system is going to be something to behold.

 

We ain't in Kansas anymore. 

  • Like 2

Share this post


Link to post
Share on other sites
DocM    16,651

Looks like SpaceX updated the Raptor Wikipedia page - added proprietary info like mix ratio and more accurate thrust numbers.

 

Raptor 

 

Propellants: LOX/liquid methane
Mixture ratio: 3.8:1
Cycle: Full-Flow Staged Combustion
Pumps: 2× multi-stage
Chambers: 1
Chamber pressure: 30 MPa (4,400 psi)

 

Sea level performance


Thrust (S/L): 2.7 MN (610,000 lbf)
Isp (S/L): 321 seconds
Nozzle ratio: ?? (likely 50ish)
Nozzle diameter: ?? (likely <2 meters)

 

Vacuum performance


Thrust (vacuum): 3 MN (670,000 lbf)
Isp (vacuum): 362 seconds
Nozzle ratio: 150
Nozzle diameter: ~4 meters (13 ft)

  • Like 2

Share this post


Link to post
Share on other sites
DocM    16,651

Typo correction

 

Isp (vacuum): 382 seconds

  • Like 1

Share this post


Link to post
Share on other sites
Unobscured Vision    2,682

Yeah, we always lose about 10% at SL. That's the way of things ...

 

I stand by what I said though ... watching a night launch will be uncomfortable. Watching it in the daytime might be too. Two-dozen-plus Raptors going off at once is gonna be bright. :yes: 

  • Like 2

Share this post


Link to post
Share on other sites
Draggendrop    5,747

 

 

67th IAC calendar of events

151 page pdf for the 67th IAC, 2016

 

I really wish I was there...way too cool...:D

  • Like 1

Share this post


Link to post
Share on other sites
DocM    16,651

Musk corrected himself about the production Raptor area ratio.

 

@elonmusk

@rocketrepreneur Meant to say 200 AR for production vac engine. Dev will be up to 150. Beyond that, too much flow separation in Earth atmos.

Share this post


Link to post
Share on other sites
Beittil    584

Internet breaking day is upon us :D

  • Like 2

Share this post


Link to post
Share on other sites
+John.    1,395

It's here! I've only been waiting since February!

7drHiqr.gif

  • Like 3

Share this post


Link to post
Share on other sites
DocM    16,651

18:30 UTC. 
 

Share this post


Link to post
Share on other sites
Draggendrop    5,747

Ed the Sock.jpg

 

50 minutes to "showtime"....xmas in September....

 

 

 

 

 

 

 

 

 

 

:D

 

  • Like 1

Share this post


Link to post
Share on other sites
anthdci    218

that video!

Share this post


Link to post
Share on other sites
Beittil    584

Initial response...

how-can-diabetes-faint-800x800.jpg

  • Like 2

Share this post


Link to post
Share on other sites
DocM    16,651

ITS-engines.jpg

  • Like 2

Share this post


Link to post
Share on other sites
anthdci    218

mind blown if they pull this off!

  • Like 1

Share this post


Link to post
Share on other sites
FloatingFatMan    19,056

Hurry up! Stupid minutes and seconds ticking by so slowly!

  • Like 1

Share this post


Link to post
Share on other sites
DocM    16,651

42 engines on BFR is about 28 million pounds of liftoff thrust.

 

Boosback

spacex-bfr-boostback.jpg

  • Like 2

Share this post


Link to post
Share on other sites
anthdci    218

thats smaller than the 15m predicted... those engines must be packed pretty tight

Share this post


Link to post
Share on other sites
DocM    16,651

I figured 15m for 30 or less engines, but 12m for 42? 

 

Differential throttle steering?

Share this post


Link to post
Share on other sites
Beittil    584

 

Le Meh...

Share this post


Link to post
Share on other sites
DocM    16,651

28 km/s , about a 25 day transit.
 

  • Like 1

Share this post


Link to post
Share on other sites
Draggendrop    5,747

 

 

 

Share this post


Link to post
Share on other sites
This topic is now closed to further replies.
Sign in to follow this  

  • Recently Browsing   0 members

    No registered users viewing this page.