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.

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985 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-...
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166 views

Does the SpaceX spacesuit address any of the criticisms of ACES raised by Columbia Crew Survival Investigation Report?

A brief history of what Shuttle crews wore for ascent and entry, from the Columbia Crew Survival Investigation Report: The shuttle was originally designed to be operated in a shirtsleeve (bare-hands) ...
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171 views

Why is the water pumped out of the holding tank a minute before Falcon 9 liftoff?

SpaceX Falcon 9 - starlink mission on October 5. Video : Why is the water discharged at T- 01m:30s from the holding tank far away from the launch pad? This was also ...
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330 views

Do Starlink satellites have cameras?

Obviously, Starlink satellites are equipped with sensors for attitude and location detection (like a star tracker or sun tracker) but I'm wondering if they have with any direct Earth observation ...
9
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767 views

Roughly how many self-viewing cameras are present in a Falcon 9 LEO mission?

Watch any of last year's SpaceX LEO satellite deployment missions's broadcasts in YouTube, and you can see views from at least several different cameras. At least two on the 2nd stage nozzle, at least ...
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219 views

Will SpaceX paint over the NASA Worm on booster 1058 for its next flight?

For the Dragon Crew mission SpaceX flew a brand new booster (how declasse) B1058 and painted it with the old style NASA Worm logo. SpaceX owns the booster and is most likely to fly it many more times ...
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425 views

Why do the SpaceX suits require “drying” during the mission?

In the period when the Crew Dragon Demo-2 mission was initially docking with the ISS, before the hatches were open, one of the tasks was to "dry the suits". They reported on the status later, ...
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189 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 ...
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629 views

Dragon Pad Abort hot fire, how much cleanup work was needed?

The day before the Pad Abort test attempt (May 5, 2015) SpaceX test fired the SuperDraco engines in a hot fire. Similar to how they test the Falcon 9 a day or three before launch, the engines spin up ...
8
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1answer
210 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. ...
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116 views

What was the thin, black object that was moving around the engine bay of SpaceX Starship SN15?

SpaceX Starship SN15 flew and landed successfully but, A few minutes into the flight, a long, thin seemingly black object was seen moving around the engine bay What was this object? What is it used ...
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184 views

Would this Starship design alternative be viable?

Considering Starship atmospheric entry, belly dive and "bellyflop", latest iteration displays four aerodynamic surfaces, two aft fins and two carard fins. Soon will this configuration be put ...
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682 views

Why were the SpaceX ninjas (pad crew) using a stepladder to move something?

On the second launch attempt of the Dragon Crew Demo 2 (human spaceflight), sometime lower than 1:50:00 to launch, the ninjas spend about 5 minutes on a stepladder, dealing with a tube and box, which ...
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357 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 ...
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177 views

What are the highlighted rectangular objects on the SpaceX's CRS 21 Dragon capsule?

What are the rectangular objects seemingly placed where otherwise Super Dracos would be - in this picture of the CRS 21 Dragon 2 capsule? Reference: https://twitter.com/SpaceX/status/...
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SpaceX Dragon Shape: Power Series, Ellipsoid, or Haack/Von Karman?

The SpaceX Dragon module has a round apex typical of power series, ellipsoid, and Haack/Von Karman shapes. I'm wondering which of these SpaceX actually used. References would be appreciated. My guess ...
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79 views

What is the speed of crew Dragon upon splashdown?

After reentry, what is the speed of the Dragon 2 capsule right before splashdown? What g-force is received upon splashdown? At the time of writing, this answer gives such information for many other ...
6
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224 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?
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159 views

Does the low gravity on Moon eliminate the need for a launch pad/flame trench for a reusable rocket launch?

I'm new to rocket science and I learned how the rockets do not reach full thrust immediately and isn't really stable for the initial couple of seconds - hence the need for "launch clamps" and a ...
6
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295 views

Could SpaceX's Starship's landing and restart process work on Titan?

Gravity on Saturn's moon Titan is much weaker and the atmosphere is far denser than either Earth's or Mars's, which Starship seems to have been designed for. Could an unmanned starship do an Earth-...
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208 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 ...
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1k 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 ...
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161 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 ...
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128 views

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

Which system did spacex rely to? Falcon, not dragon
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1answer
420 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?
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76 views

Crew Dragon: How thick is the skin?

Auto body panels are about 20-gauge, or just under 1 mm thick. This is fine for many reasons: thin panels are light for good fuel economy and crumple easily for shock absorption without unnecessary ...
5
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187 views

What is this ring-shaped part falling from Starship SN9 after launch?

The picture shown is a screenshot during the recent launch of SpaceX's SN9 from a live stream, and I noticed that a black ring fell off the exhaust/engine. It only shows up for around a frame or two ...
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113 views

How often has the Hitchhiker's Guide to the Galaxy been in space?

I came across an answer saying that a copy of the Hitchhikers Guide to the Galaxy was sent to space in Elon Musks roadster (in 2018). Has the book been in space before that (maybe taken to the ISS by ...
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116 views

Is Crew Dragon rated for any non-Spacex boosters?

The Spacex crew Dragon uses the Falcon 9 for its orbital launches, and is not set to ever use a different launcher. However, an uncrewed Dragon will probably launch on the Falcon Heavy, as is planned ...
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89 views

How much pressure would the raptor engines experience when Starship does an atmosphere entry burn at Mars?

The Starship second stage has 3 sea level engines and 3 vacuum engines. When doing the atmosphere entry burn to mars, how many Bars will the raptor engines experience? I'm thinking that because of the ...
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71 views

Electrical power requirements for Starship or Falcon 9

Anybody know where one could dig up electrical requirements for Starship? In other words, if Starship were sitting on the launch pad drawing power prior to launch, what would the load be? I imagine ...
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76 views

Thrombosis risk before launch

I am currently following the live broadcast of today's SpaceX launch. For a few hours already, astronauts are sitting inside the vessel, barely able to move. I wonder what precautions are taken to ...
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135 views

How does the SpaceX Dragon nosecone separate?

SpaceX's Dragon uses a nosecone to protect the docking port during ascent. The nosecone seems very large. 1/3 of the capsule's height large. And yet, it separates while the second stage engine is ...
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248 views

Power supply for StarShip?

Early renderings of the Mars Colonial Transport showed 2 fan shaped solar arrays deployed while in space. I haven seen any depictions of the StarShip with a solar array either in orbit or standing on ...
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81 views

How similar to a crewed flight will SpaceX Demo Mission 1 be?

With the upcoming premiere of the Dragon 2 in SpaceX's DM1 launch, I was wondering how similar it will be to a mission with actual astronauts. What I mean by this is things like: Will the launch ...
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187 views

Purging process of a rocket engine

Does spacex purge Falcon 9 engines after landing ? If so, which gas is used for purging?
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298 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?
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360 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 ...
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162 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
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175 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 ...
5
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1answer
381 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 ...
5
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1answer
307 views

What is the O/F mixture ratio and the ISP for the SuperDraco Engine by SpaceX?

Is it safe to assume a mixture ratio of 2.16 with an ISP of 313 s for the NTO/MMH, SuperDraco Engine manufactured by SpaceX? I am referencing the 2.16 propellant mixture ratio, and estimating or ...
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90 views

What material on windows of space vehicles?

Submarine windows are designed to withstand extreme pressure differentials, and at least on private submarines, those are generally made of thick acrylic. I want to say space vehicles like Crew Dragon ...
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235 views

What was the cause of the fire on the SpaceX Starship SN15

SpaceX Starship SN15 had a successful test flight and touchdown but a few minutes after it landed, a small fire was seen to break out next to the Fins. Why did this break out? What was the cause of ...
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62 views

How problematic is debris for Starship storage/depots?

So with the recent announcement that Starship has been selected as NASA's HLS (which is pretty radical), it's raised a question in me that been around for a while. For HLS; a Starship storage(depot) ...
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245 views

SN11 was launched in fog. Why not wait for better conditions?

The fog certainly frustrated the external observers, but it doesn't seem ideal from SpaceX perspective either. All the external observers were very distant from the launch/landing site and would be ...
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38 views

What does diiferent colours in orbital path seen in the CRS 21 launch video indicate?

The SpaceX broadcast of Falcon 9 - CRS 21 launch showed the orbital path of the vehicle differently than previous videos. Separate green lines and rectangualar boxes were visible. What additional ...
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214 views

How heavy is SpaceX's Octagrabber?

SpaceX's drone ships have a vehicle that drives under a booster after landing and then clamps onto it to secure it. Photos of it suggest that it has neither ballast nor any way to clamp onto the ...
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0answers
1k views

How much will Starship SN8 weigh on liftoff?

Apparently SN8 recently underwent a 'Cryo' pressure test and to do that the press stated that 1000 tonnes of liquid Nitrogen was used! Is that really true? That got me thinking: just how much does ...
4
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0answers
43 views

What was the Crew Dragon reentry mass for the mission that landed August 2, 2020?

What was the Crew Dragon reentry and touchdown mass for the mission that landed August 2, 2020? (I found that Soyuz Descent Module has a reentry mass of 2850 kg.) See: http://www.braeunig.us/space/...