Linked Questions

67
votes
10answers
42k views

Why is SpaceX considering Methane as fuel for their next engine, the Raptor?

Currently, SpaceX has developed the Merlin 1 family (1B (Falcon 1), 1C (Falcon 9 v1.0), 1D (Falcon 9 v1.1/F9-R/Falcon Heavy), vacuum versions and sealevel versions) which are LOX/RP1 based. (75-...
14
votes
3answers
5k views

Is the supercooled LOX used in Falcon 9 Full Thrust a first?

One of the changes made to the Falcon 9 v1.1 Full Thrust was using supercooled liquid oxygen at 66 K (-340 F) as well as chilled RP-1. I've seen various claims that this is a first in the industry. ...
5
votes
3answers
4k views

Autogenous pressurization with sub-cooled propellant

In his IAC 2016 talk, Elon Musk said (at 28m 4s in the video) that the ITS booster tanks would use autogenous pressurization. This means there is gaseous oxygen resp. methane in the tank. To stay ...
4
votes
1answer
1k views

Vector-R's LP-1 and -2 engines use liquid propylene as fuel with LOX, advantages and distinctions from kerosene?

@gwally's answer highlights the company Vector Launch Inc. and their Vector-R rocket, which uses three LP-1 18,300 lbf engines on the first stage and one LP-2 1,000 lbf second stage engine to put ...
3
votes
3answers
248 views

3* Tonnes Unaccounted for in Falcon 9 FT Weight Wikipedia Calculation?

On the Falcon 9 FT Wikipedia page, the fully fuelled weight of Falcon 9 is only 546 300kg instead of 549,054kg as stated on SpaceX website. 546,300 kg - Wikipedia ...
2
votes
1answer
389 views

ULA's plan for LH2/LOX 2nd stage that can maintain propellant for an extended period of time?

Business Insider's (long) article SpaceX's biggest rival has a 'genius' plan to cut its rocket launch costs more than 70% contains the statements sourced from ULA's CEO Tory Bruno: Vulcan should ...
0
votes
1answer
575 views

Is the “cryogenic helium” system in recent discussions actually LHe for cryopumping?

I am wondering if the "cryogenic helium" system discussed in articles about the 1-Sept-2016 SpaceX Falcon 9 anomaly (see this answer for a good summary to date) is not actually related to the high ...
3
votes
1answer
326 views

How would the Saturn V have differed if the first stage was using liquid methane and LOX?

We have seen here the excellent answer to the question: How would the Saturn V have differed if the first stage was also LH2/LOX? What if liquid methane would be used instead of kerosene? Would the ...
2
votes
2answers
164 views

Is it possible to load propellant during the lift off? [duplicate]

Falcon 9 rocket consumes approximately 30 tons of fuel for the first 15 seconds of flight while it's still less than 350 meters in altitude. Is it possible to build a giant tower near the launchpad, ...
6
votes
0answers
326 views

Why NASA's sudden (apparently) interest in Wax hybrid engines? Which property is so attractive now?

I've just read the NASA news item From Pedicures to the Peregrine Rocket, Paraffin Wax Proves Its Worth. The project started when researchers at Stanford discovered that paraffin fuel burns three ...
0
votes
1answer
212 views

Is NASA's Performance Vehicle Calculator website open for public use?

This answer links to "NASA's Performance Vehicle Calculator" with the link https://elvperf.ksc.nasa.gov/Pages/Query.aspx I've also found the same link in https://forum.nasaspaceflight.com/index....