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 and a crewed mission into orbit. See wiki for related tags.

Filter by
Sorted by
Tagged with
2
votes
0answers
39 views

Why would the Falcon 9 Block 5 carbon fiber thermal protection material need to be hydrophobic?

This answer to Nature of “the silky black 'highly flame-resistant felt'” on Block 5 Falcon 9's, and its intended functions? contains the following: This came into Falcon 9 design with Block 5 ...
7
votes
1answer
172 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 ...
8
votes
2answers
533 views

SpaceX Falcon-9 fairing heating during launch?

In watching the SpaceX SES-12 launch last night, I noticed what looked like the fairing of the rocket glowing a bit a while after launch. This was most obvious in the SpaceX video SES-12 Mission ...
4
votes
0answers
62 views

What's the logic behind the Draco RCS clusters?

Dragon V2 has four clusters of three Draco RCS thrusters on the front and back plus four under the nose cover. One thing is sure: that the thrusters can be fired to control linear motion in x, y, and ...
8
votes
1answer
200 views

Can SpaceX Starship Be laid on it’s side?

SpaceX is building Starships at a good tempo and may finally build them faster then they scrap them. The Falcon 9s have always been stored horizontally and erected at the launch pad. I’ve never seen a ...
1
vote
0answers
39 views

Is Starlink VisorSat really dimmer?

Basically a repeat of Is Starlink 1130 (Darksat) really dimmer? but this time with Visorsat. What is the observed brightness of VisorSat(s) and is it dimmer than non-Visorsat Starlink satellites?
4
votes
1answer
109 views

Crew dragon falcon 9 first stage shut down

Crew dragon falcon 9 first stage shut down around 6700 km/hr and starlink shut down around 7900 km/hr, but around the same time. Is this because the crew dragon weighs more?
5
votes
1answer
76 views

Do the ASDS barges have mission specific equipment?

End of June 2020, there was a planned Starlink (L9) mission on Jun 26, and OCISLY (Of Course I Still Love You, name of the vessel, really! Not making that up!) went out catch the stage. Then a few ...
9
votes
0answers
114 views

How does the Dragon nose hinge work?

The Dragon nose has a fairly elaborate hinge. I've read it's actuated by a hydraulic cylinder. Is that what I see in the picture below by the green line? Is it perpendicular to the longitudinal axis (...
7
votes
1answer
92 views

What goes in the bottom of the Dragon structural dome?

The Dragon has a structural dome shaped like a truncated cone (A below) on a stubby cylinder (B). Q: Is the crew section entirely in the truncated cone, or is it split in two stories with the second ...
3
votes
2answers
215 views

When Falcon 9's stage 2 engine fires up, does the flame of the engine affect stage 1 in any way?

Are there any specific design considerations that are made over nonreusable, traditional rockets to tolerate the blast from the stage 2 engine? As shown in this moment:
17
votes
2answers
2k views

Why will Superheavy/Starship have a landing pad so close to the launch pad?

According to this image (taken from this answer) The landing zone is situated right next to the Starship pad. In contrast, the Falcon 9 landing pads are much much further at 28°29′09″N 80°32′40″W on ...
8
votes
1answer
182 views

What is inside the overhead compartments in crew dragon

During the DEMO-2 live stream there was a black section visible above the heads of the astronauts. In an image tweeted out by Elon these were labeled as “9” and “10” with symbols of water droplets. ...
27
votes
2answers
5k views

Why do Crew Dragon astronauts need to climb up one level using the stairs before ingress?

While watching the launch of SpaceX Crew Dragon, I noticed that, once the astronauts came out of the elevator in the fixed service structure, they had to 'climb up' one level using the stairs, before ...
5
votes
3answers
316 views

How does SpaceX Falcon 9 keep balance while it is near to the landing site?

As we know, flight vehicles can't keep balance easily if they cannot propel enough air through their blades or wings. We can also see the Falcon 9 at a steeper angle a while before touching down on ...
3
votes
0answers
48 views

how much force can a falcon 9 landing leg handle

According to spacex, the falcon 9 landing legs are made of carbon fiber with aluminum in a honeycomb shape. How much force would be needed to break that?
3
votes
0answers
56 views

How thick is SpaceX's Dragon shell?

Is it just a thin shell like a rocket has, or is it lined with thermal insulation on the inside? Trying to model in 3D and am wondering how to make the shell panels---thin like those of a car or thick....
6
votes
2answers
307 views

Landing legs problem with Falcon 9 Block 5 / Starlink 3 mission

Is this a late landing burn problem? it seems that the engine touch the OCISLY ground as the landing legs flex. Landing occurs at about T+0:08:20
13
votes
1answer
183 views

Why did SpaceX swap the LOX and CH4 tanks between Mk1 and SN1?

According to most sources, the Starship Mk.1 had its LOX main tank (not talking about the header tanks here) on top and its main methane tank below. But it seems the SN1 revision, and all subsequent ...
6
votes
1answer
175 views

Are the SpaceX ground crew wearing masks as part of a standard suit or to prevent COVID-19?

Watching the live SpaceX operations and I noticed the ground crew were all wearing masks Is this part of the standard ground crew kit, or is this just for COVID-19 prevention?
4
votes
1answer
110 views

Can the Valsalva maneuver or nose-scratching be done inside a SpaceX suit helmet?

Sometimes you gotta scratch your nose. Or you need to perform the Valsalva maneuver (close your nose and mouth, then blow hard) to help make your ears "pop". If you can flip your helmet ...
1
vote
0answers
162 views

What light was the Falcon 9 grid fin occulting in todays SpaceX Nusantara Satu Mission live broadcast?

What light was the Falcon 9 grid fin occulting in todays SpaceX Nusantara Satu Mission live broadcast? I backed up the time slider on the YouTube live broadcast and snapped some screen captures, ...
2
votes
0answers
171 views

What is producing these strange lights around the Falcon 9 grid fins (Starlink launch)?

Early in the video of the launch of the first sixty SpaceX Starlink satellites we can see that after stage separation the first stage grid fins open. Around that time there are some phenomena I don't ...
6
votes
0answers
196 views

What (the heck) is this purple donut in the video of the Falcon 9 fairing's atmospheric reentry?

This SpaceX tweet (found in CNET's SpaceX camera captures incredible view of rocket part returning to Earth) shows a video taken by a camera in one half of the fairing on the recent STP-2 mission and ...
4
votes
2answers
1k views

Is the Falcon 9 launch/landing telemetry data available for visualisation purposes?

If like to visualize the launch and landing, maybe tied into the audio.
12
votes
3answers
1k views

Would it be possible for SpaceX's BFR to return the Hubble Space Telescope to Earth in the future?

Ever since the Space Shuttle retired, there was an unpopular decision to leave the Hubble Space Telescope until it eventually stopped working, since there was going to be no way to return it to Earth. ...
15
votes
2answers
1k views

How strong and “hot” is the wind on the payload after the fairing is deployed at ~110km?

In the question What makes 21st century fairings so valuable that they'd potentially be recovered and re-used? I said: 21st century fairings are much more than passive rooftop boxes to "keep the ...
7
votes
3answers
290 views

Starship Flame trench

During static fires of the Starship engines the exhaust goes everywhere creating a dust cloud, hitting everything with sand. Why does Spacex in Boca Chica not have a flame trench at the Starship test ...
3
votes
0answers
96 views

Space-X Falcon-9 and Falcon Heavy fuel consumed for landing

The question is, how much fuel is used by each of above rockets for landing (in % of whole fuel of the rocket) as a function of three following components - payload, orbit and descend trajectory (land/...
6
votes
2answers
208 views

SpaceX Body Flaps - Why so Much Power Required

I don't doubt the credibility of this particular source, but why would control surfaces, even at hypersonic speed (in rarefied air, mind you), and even with substantial windward surface, require 1.5 ...
3
votes
0answers
43 views

Where are Falcon 9 1st stage GN2 tanks located?

Is nitrogen propellant for the two cold gas thrusters pods contained in the interstage? The view we have from the B5-B1050 recovery shows several small COPV(s) pic1 Here you can see where the cold gas ...
11
votes
3answers
2k views

Can the Indian government ask SpaceX to pay for bandwidth usage in its airspace?

Any telecom operator who wants to launch their services in India has to pay billions of USD to the Indian government. My query is if I'm using SpaceX Starlink based data, can the Indian government ...
7
votes
1answer
145 views

Which are good resources to learn more about the components of a rocket engine?

A detailed and annotated image of a SpaceX raptor engine (found on a SpaceX website) illustrates that in addition to the major components (e.g. pumps, inlets, combustion chamber, nozzle), there are ...
3
votes
0answers
229 views

What is the function of this Merlin engine's tube, and why is it getting red hot?

In the video of the recent SpaceX Starlink launch, one view of the Falcon-9 2nd stage engine shows a cane-shaped tube that glows red hot at the "handle" end and seems to get hotter over time....
5
votes
1answer
114 views

How do Falcon 9 grid fins deploy?

Is it aerodynamic drag that flaps the grid fins open? Or is there a controlled mechanism for it? Pictures show the grid fins connect through a small link to something inside the rotating trunnion arm--...
3
votes
2answers
259 views

Is this an IR or visible light image? What's illuminating the F9's grid fins?

I saw this image in Spaceflight Now's 30-Oct-2017 article SpaceX Falcon 9 successfully launches Koreasat 5A. Pitch-black background and rocket body with extremely bright grid fins. Is this an ...
5
votes
3answers
1k views

What happens if the Falcon 9 launches with its grid fins open?

Let's suppose that the grid fins of the Falcon 9 remain open and the rocket still launches. This is probably never going to happen because the SpaceX team is exceptionally good, but I am trying to see ...
7
votes
2answers
1k views

Why is SpaceX deploying Starlink satellites without inter-satellite communication capability?

According to this answer, which cites Wikipedia, the current batch of Starlink satellites that are being deployed don't have the ability to talk to each other. That will come later, according to ...
10
votes
1answer
96 views

What factors do (or are expected to) limit reuse of a Falcon 9 block 5 first stage?

SpaceX have claimed (reported here) that the Falcon 9 Block 5 first stage should be reusable up to 10 times without significant refurbishment, and up to 100 times in total. What factors are expected ...
11
votes
1answer
2k views

What is this propeller-like object on top of the SpaceX Hopper?

In the spirit of Why does this rocket have a nose cone “cozy”? I'd like to ask why the SpaceX Hopper has a propellor on top, or at least something that looks reminiscent of Beany's propeller. What is ...
15
votes
1answer
657 views

Starlink's autonomous collision avoidance

On their website, SpaceX claims that Starlink satellites are able to conduct autonomous collision avoidance manoeuvres using alerts from the US Department of Defence. This seems very reasonable, given ...
4
votes
1answer
165 views

What are these cartridges with holes on the Dragon trunk?

You can see them on the rim in a hexagonal pattern in the picture below. Also present in the latest version of the Dragon trunk, but less clearly than here. They alternate in color from nickel to ...
7
votes
1answer
643 views

Effects On ISS Orbital Mechanics Resulting From Added Mass Of Dragon Capsule Visit

Does the ISS require any type of orbital mechanics management once the Dragon capsule was confirmed with a positive airlock seal, and the mass of the spacecraft, 2 additional astronauts, and supplies ...
6
votes
1answer
304 views

Falcon 9 2nd stage pusher; how far does it continue to extend as it accelerates separation?

I've just watched Scott Manley's video SpaceX's Water Landing Reveals Rocket "Secrets" (or, What We Learned from CRS-16) (again) and he mentions the second stage "pusher" in the center of the view (...
12
votes
1answer
205 views

Why couldn't the (original) Dragon land in the Atlantic?

Some of the coverage of the last flight of an original Dragon freighter mentions that the coming Dragon 2 will be able to land in the Atlantic, with resulting advantages: Beginning with the CRS-21 ...
3
votes
0answers
49 views

Relative elevations of the bases for Falcon and Starship pad at LC-39A

The NASA environmental report of August 2019 (https://netspublic.grc.nasa.gov/main/20190801_Final_DRAFT_EA_SpaceX_Starship.pdf) provides a 2D view of of the planned changes to 39A for Starship. A ...
24
votes
1answer
2k 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 ...
6
votes
1answer
87 views

SpaceX Dragon 2 (Crew Dragon) Standalone Mission Duration

Wikipedia's Dragon 2 page states a one week free flight limit. However, by following their source, the only information available is mission duration from one week to two years. This book also states ...
12
votes
1answer
338 views

What is this device/object that the SpaceX astronauts are holding?

Watching the SpaceX Demo-2 launch preparation livestream, I saw both Bob and Doug using some sort of little gadget. It looks like a chunky cell phone, or a flat gopro. It appears to have an LCD on the ...
37
votes
4answers
6k views

After the Crew Dragon's success, does Boeing's Starliner still offer value?

Boeing's Starliner is more expensive than Crew Dragon and seems not to offer any significant advantages. Is there still value to NASA or other parties in the future to having a choice between the two?

1
2 3 4 5
23