Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [spacex]

Space Exploration Technologies Corporation, or SpaceX, is a private space exploration company. It was the world's first privately held company to successfully launch a cargo mission into space.

14
votes
1answer
782 views

What is the value of the cross-track angle between the two designated CRS-4 first stage recovery zones?

For the SpaceX Falcon 9 launch on its Dragon/CRS-4 cargo delivery mission to the International Space Station, according to Spaceflight 101, two downrange safety zones have been identified: The SpX-...
7
votes
1answer
234 views

SpaceX 2nd stage or tumbling satellite? WSW to NE over FL

Around 2040 EST We viewed an irregularly flashing object flying from WSW to NNE (roughly) from Jacksonville FL. Is the SpaceX 2nd stage still up there and if so, would it be tumbling and visible? Is ...
6
votes
1answer
375 views

How does the flight trajectory of a GEO vs LEO mission vary for a Falcon 9 first stage?

How does the trajectory vary between the two types of missions? Specifically, how does the speed and velocity vary for the booster for a Falcon 9 mission?
19
votes
0answers
1k views

Where is the TEA-TEB stored for the Merlin engines onboard Falcon 9?

The Merlin 1D engines can restart up to four times, they use the pyrophoric mixture of TEA-TEB (Triethylaluminum-Triethylborane) to ignite the engines. My question is where is this stored in the ...
9
votes
0answers
198 views

How is Dragon-v2 prepared for being docked for months at ISS?

The Dragon spacecraft is being certified for manned spaceflight. If it's to replace Soyuz, though, it will have to serve as an escape pod for the crew. The current delivery missions are proving its ...
9
votes
0answers
156 views

Has SpaceX ever done a hot restart of a 2nd stage?

Another question highlighted this Space X commentary for the GRACE-FO launch: Now in order to fly an efficient trajectory for both of the payloads, we’re actually now running the second stage ...
8
votes
0answers
315 views

What caused this shadow on Falcon 9 stage 2 w/Jason-3 before circularization burn?

While the image appears bright, the light is just reflected sunlight (from the earth, per the webcast). The circularization burn doesn't start until about T+ 00:55:16 per the SpaceX webcast. But at ...
7
votes
0answers
167 views

Onboard recording of trans-Mars injection

Is there any video recording of the Falcon Heavy trans-Mars injection burn from onboard cameras? The live feed of the Tesla Roadster and Starman orbiting Earth cycled through multiple cameras ...
7
votes
0answers
108 views

Did SpaceX use TDRSS or USAF ground station to track Falcon 9 stage 2?

Which system did spacex rely to? Falcon, not dragon
6
votes
0answers
186 views

How is Mr Steven piloted when catching a fairing?

Mr Steven is the ocean-going vessel used by SpaceX in its attempts to catch re-entrant Falcon 9 fairings for possible reuse. How is this ship controlled during fairing catch attempts? Is she* manned ...
6
votes
0answers
143 views

What accounts for the signal delay from cameras on the Falcon 9?

On the last few webcasts, SpaceX has shown video from both ground tracking cameras and the on-board camera side-by-side, and there's a noticable delay between the two, with the on-board camera being ...
6
votes
0answers
162 views

SpaceX CRS-11 landing pad debris identification

After sending CRS-11 into orbit to rendezvous with the space station, the first stage of the SpaceX rocket Dragon landed on Landing Zone one. In the video released subsequently you can see two pieces ...
6
votes
0answers
418 views

What upgrades does the Merlin 1D need to increase its time between overhauls to 1000 hours?

This is a question I've been pondering for the last few weeks after I back-calculated the details of the Merlin 1D engine. Just as a thought exercise, I wanted to see what upgrades the Merlin 1D would ...
5
votes
0answers
105 views

Why is heated Helium used for tank pressurisation in Falcon 1?

Here in Falcon 1 user guide, in table 2-1 in page 8, heated Helium is mentioned as used for tank pressurisation. What will be the temperature of such He and why is heated He used?
5
votes
0answers
106 views

Does the downrange position of an ASDS vary, depending on payload mass?

SpaceX in its recovery attempts can either do a Return To Launch Site (RTLS) or land downrange on an ASDS landing barge. The Telesat 19V and 18V payloads were some of the heaviest payloads on the ...
5
votes
0answers
110 views

Nature of “the silky black 'highly flame-resistant felt'” on Block 5 Falcon 9's, and its intended functions?

The Teslarati article SpaceX Falcon 9 Block 5 rocket’s drone ship return captured in stunning detail [gallery] and accompanying photo spread shows many interesting details of "SpaceX’s first West ...
5
votes
0answers
112 views

What is the droplet size that is desirable for pintle injectors?

The pintle injectors tend to generate droplets after impingement of the fuel and the oxidiser stream and I understand that the droplets will be premixed. In such a case, even a larger premixed ...
5
votes
0answers
958 views

Potential improvement to BFR or New Glenn if equipped with aerospike exhaust on their engines?

Aerospikes basically tackle the issue of the variability in required expansion ratio for a rocket engine to be efficient at a given altitude. A recent example though mired in legal issues is a small ...
5
votes
0answers
518 views

Progress of the raptor engine

I have seen that Space X has tested a scaled down version of the raptor, but that was about a year ago. Does anyone know the current progress? Do they have a full scale model? Have they hot fired a ...
5
votes
0answers
495 views

Falcon 9 v1.1 Full Thrust Specifications

Does anyone know what the dry mass and mass ratio of the Falcon 9v1.1 Full Thrust Stage 1 is? The best info I've been able to find was by taking the specified burn time and multiplying it by the mass ...
5
votes
0answers
79 views

Atmospherics for 'next generation' manned space flight / Exploratory Class Missions

Decompression sickness is a significant risk to both current and future astronauts and currently significant time is lost in preparation for extra-vehicular activity on the ISS [including airlock ...
4
votes
0answers
155 views

What is SpaceX's parachute problem that NASA is concerned about in the NASA ASAP report?

The Washington Post's NASA to launch safety review of SpaceX and Boeing after video of Elon Musk smoking pot rankled agency leaders says: Earlier this year, Boeing had a propellant leak during a ...
4
votes
0answers
69 views

Purging process of a rocket engine

Does spacex purge Falcon 9 engines after landing ? If so, which gas is used for purging?
4
votes
0answers
114 views

Fuel carried by current Crew Dragon

How much fuel weight will the current Crew Dragon carry? Will it be just enough for launch abort, or the full load (over 3000 lbs) needed for propulsive landing as a back-up to the parachutes? I ...
4
votes
0answers
68 views

What sort of ambient air density was there when/were Starman/Roadster first started playing Bowie's “Life on Mars”

When the Falcon Heavy test flight 2nd stage fairing opened at about 115 km, David Bowie started singing "Life on Mars". Okay, the Tesla Roadster's stereo started playing "Life on Mars", or at least ...
4
votes
0answers
150 views

Is there any flutter analysis available regarding Falcon's grid fins?

I have never come across any papers which talks about flutter analysis of gridded fins in general, does it not under go flutter behavior or is it technically incorrect to talk about flutter for ...
4
votes
0answers
90 views

How long does it take SpaceX to mount a stage on the McGrgeor test stand, run the test, and dismount it?

Gwynne Shotwell at SmallSat 2016 in Utah mentioned that SpaceX would be using the JCSAT-14 recovered first stage as a fleet leader in wear and tear. That they would be mounting it on the McGregor, TX ...
3
votes
0answers
49 views

What are the chances that the ISS transits the moon as seen from your house (or headquarters)?

In this answer I tried to do a simple probablistic estimate on the distribution of the ISS's ground track passes over Earth's equator. Recently there is a photo of the ISS passing over SpaceX ...
3
votes
0answers
74 views

What could be used to associate these fairing halves with their launches?

Eric Ralph's Teslarati article SpaceX’s BFR factory in LA spied with four Falcon 9 fairing halves shows several panoramic photos of the site for the future rocket factory. In it, the author says: ...
2
votes
0answers
116 views

Does the 90 million cost for the Falcon Heavy include everything?

SpaceX says that it costs them 90 million each time to launch a Falcon Heavy, does this include fuel? If I where to purchase a Falcon Heavy launch, how much would it cost me to launch it, buying my ...
2
votes
0answers
94 views

How much noise would the BFR make at launch?

In addition to multi-planetary travel, SpaceX has plans to use the BFR for intercontinental travel. However, would the sound generated by the BFR's launch disrupt local communities and therefore make ...
2
votes
0answers
63 views

Falcon fairing half - between separation and parachutes deployment

How does Falcon fairing half behaves in atmosphere before parachutes deployment? What is its free fall attitude in atmosphere? Is the fairing's attitude stable (with some wobbling, but without ...
2
votes
0answers
74 views

Time For SpaceX to Plot Landing Course

How much time would it take for the SpaceX engineers/astrophysicist/other employees to plot the landing course for the reusable first stage rocket to land exactly on a 214 by 170 meter landing pad (or ...
2
votes
0answers
168 views

What kind of power does “…most powerful all-electric propulsion communications satellite ever produced” refer to?

The Florida Today article On second flight, SpaceX Falcon 9 rocket to launch 'brute' of a satellite from Cape describes the upcoming SpaceX launch of SES-12. Next to this tiny image of (presumably) ...
2
votes
0answers
201 views

What's up with Star Man's Roadster's suspension?

On Earth, a vehicle's weight compresses the suspension, and the wheel rims are generally designed to closely fit the contour of the tires with only a small gap between. Take away that weight, the ...
2
votes
0answers
139 views

For a cubesat mission piggybacking on a Red Dragon, what are the tradeoffs for launch early and late in the launch window?

SpaceX will be launching two Red Dragons in 2020, one at the beginning of the launch window (July) and one at the end (September). For a CubeSat mission that would have to piggyback on one of the two ...
2
votes
0answers
203 views

How much helium and nitrogen are used in SpaceX's Falcon 9?

How much helium and nitrogen are used on SpaceX's Falcon 9?
1
vote
0answers
49 views

What are some drawbacks of Automated Flight Termination Systems (AFTS) sometimes called Automated Flight Safety Systems (AFSS)?

I often read about how AFSS is the the next big part of the range of the future, and how it is a tremendous improvement upon the current system. But I never really read about the drawbacks. No ...
1
vote
0answers
109 views

Details about the BFR abort procedures?

What kind of emergency procedures will the BFR have during landings? I can see an abort to an alternate landing zone but what about when you have a an emergency ten seconds after engine shutdown?
1
vote
0answers
46 views

Temperature indicators/labels on space debris?

There was a picture in this question about space debris on shore. Seems to be a part of a Falcon 9. The round stickers are used for temperature control. Similar labels are sold by some companies, for ...
1
vote
0answers
250 views

Could the Starman/Roadster spacecraft have targeted a well defined heliocentric orbit if it had wanted to?

Does the FH upper stage have things like inertial guidance, star cameras, GPS/GNSS, and/or other helpful equipment that would have allowed it to do careful thrust vectoring during the 3rd and final ...
1
vote
0answers
449 views

How much fuel is necessary for 2nd stage of Falcon 9 rocket to land?

What is the fuel mass nedeed for the 2nd stage of Falcon 9 rocket to land, how much compared with its total fuel mass that it has? Or how much delta-v is necessary? Would it be able for Falcon 9 to ...
1
vote
0answers
60 views

Does a low-orbit communication network drive a sustainable launch market?

With SpaceX recent announcement of a huge satellite network in low earth orbit, I was wondering if such a network would motivate a sustainable large-scale launch capacity, i.e. a increase of scale of ...
1
vote
0answers
285 views

What is the weird dual-tone pattern on the 2nd stage nozzle SpaceX JCSat-16?

I think it may be related to the sun, but I don't understand the "tooth" shape in the GIF - is this a shadow of something? Is the spacecraft already spinning for the satellite deployment? What are ...
0
votes
0answers
145 views

Avionics Systems on board Falcon 9 (Reusable)

What kind of control systems are active and how do they function on board a Falcon 9 booster while it's landing ?
0
votes
0answers
286 views

How to view the Feb 6, 2018 Falcon Heavy launch?

Will the Feb 6, 2018 Space x Falcon Heavy launch from KSC be visible in Boca Raton/ Deerfield Beach area? Is there a good site for determining viewing ranges for launches?