Questions tagged [landing]

Questions regarding the specific part of flights, during which a spacecraft touches down on the solid ground of a celestial body.

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5
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1answer
104 views

Would landing on mars during a storm considerably increase atmospheric drag?

Any chance we could harvest all those dust particles for an significant improvement in aero-breaking capabilities or would it destroy most heat-shields?
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Why is the first stage from the Falcon 9 SES-12 mission not recovered?

Youtube video here At 4:13 minutes into the Iridium-6/GRACE-FO NASA Launch, the commentator mentions: The first stage is not going to be recovered, so there won't be any views from the drone ship ...
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2answers
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Do Falcon 9/Heavy Block 5 boosters need landing legs? Or can they land back on their launch mounts?

At 2017's International Astronautical Congress, Elon Musk claimed that SpaceX could master propulsive landing without landing legs. The assertion was that Falcon 9's ...
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3answers
214 views

Is Mid-Air Deployment of the Mars Helicopter Feasible?

According to a recent news announcement1, NASA is going to send a small helicopter to Mars for testing purposes. Future landers could carry more of these future rotorcraft [that might] act as ...
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1answer
82 views

Would a large impactor on an ice moon cause a thinning of the ice surface?

While it has not been confirmed, Callisto (Jupiter IV) could potentially have a small subsurface ocean below a thick ~100 km ice layer, according to Wikipedia. A mission to explore that ocean might ...
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2answers
227 views

SpaceX May 11, 2018 Falcon 9 launch had no boostback burn

One of my questions regarding the May 11 launch is Why no boostback burn? I assume that without such a burn, Stage One would continue on at about 8,000 km/hr in an EASTWARD direction, away from the ...
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1answer
1k views

How does a gamma ray altimeter work? What kind of sensor is used?

The answers to the Space SE question Soyuz landing ground detection really surprised me. A gamma ray altimeter is used by the returning Soyuz capsule to detect the presence of solid ground immediately ...
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2answers
412 views

SpaceX Raptor engined first stage landing

Reusability is a key strategy for SpaceX to lower the cost of orbital and interplanetary launches. With the Falcon 9 they are using the powered landing approach to recover the first stage for reuse. ...
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1answer
184 views

How can one ensure safety of the crew capsule if the rocket blows up at max dynamic pressure?

In general, say the rocket like the Soyuz blows up any time during flight (not on the ground). Is there some way to ensure that the crew capsule can be returned safely back. If it is high enough but ...
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2answers
2k views

What is the cause of this Falcon 9 first stage “dance” after landing?

Recently I watched a video on YouTube by Scott Manley: How To Do A Hoverslam - Things Kerbal Space Program Doesn't Teach. It deals about landing burns of Falcon 9 first stages. It features short clips ...
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1answer
1k views

Which crewed spacecraft provides the gentlest decent and/or landing?

Landing with a Soyuz capsule is often compared to being in a car accident1, it's pretty violent on touch-down. On the other hand, I imagine the Space Shuttle's touch-down to be a little like a rough ...
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2answers
5k views

Could SpaceX land on the moon today?

Now that SpaceX has a bunch of flown Block 4 Falcon 9 rockets laying around, could they theoretically do a mission to the Moon with landing even if it's just a rocket with no payload? Does it work out ...
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1answer
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Why the soot pattern on the nosecone of Falcon Heavy side booster?

When a SpaceX booster is landed, we are used to seeing soot deposited all over it, usually in a specific pattern. You can read more about that in this question: Why the strange bands of soot of the ...
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3answers
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Is it possible for something to fall straight down to earth? What are the requirements?

Meteorites leave strewn-fields before impacting, SpaceX rockets come in at an angle and stand up straight at the last second, the Soyuz capsule doesn't fall straight. I assume this has to do with the ...
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1answer
304 views

Is Engine thrust noticeably increased near the ground

I know next to nothing about Rocketry and Space Flight. I assume that the majority of the force generated by a rocket's engine is simply the result of throwing gasses out of the bottom very fast, and ...
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7answers
6k views

What technological breakthroughs were required to land booster stages?

It is only recently that SpaceX developed first stages that can land again, and be reused. The (until recent) non-existent landing of re-useable rockets is presumably, partially, due to a lack of ...
3
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1answer
2k views

Just how much of the Falcon Heavy is reusable?

I've been looking for just this one bit of info, in all the press: exactly how much of the Falcon Heavy is recoverable and reusable? Obviously not the fuel, but is all the hardware recovered? If so, ...
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2answers
2k views

Why did the Falcon Heavy core engines fail to reignite?

I realize that this is a hot take, less than twenty-four hours later at the time of posting, but is any technical detail known about why the core engines failed to restart, causing the crash?
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2answers
5k views

Did the fairings from the Falcon Heavy test flight get recovered?

According to the flight plan that Elon Musk posted on Twitter, there's a section listed as 'Fairing Recovery', was this section successful? Did the Fairings get recovered?
8
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1answer
349 views

How will they lower the landed side boosters after landing, if there is a nose cone?

To lower/handle landed stages, SpaceX has a rig that connects to the inter stage and they use it as an attach point for the crane to lift/move it. The two cores landed in Florida after the first ...
4
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1answer
374 views

Does the centre core really need three engines to land, and if so why?

Reports suggest that the centre core of the FH launch crashed because it couldn't get the necessary three engines relit. If this isn't a misunderstanding (there was something about the shrapnel ...
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2answers
3k views

Why not jettison the nose-cone from Falcon Heavy side boosters for better control authority?

With February 6th's launch of Falcon Heavy we saw the landing of both side boosters. During the past few weeks and again in the press conference today I've heard over and over about the increased ...
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3answers
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If the SpaceX drone ship's camera feed gets disrupted every landing, why cant they throw the antennae off the ship on a buoy for better reception?

They mentioned on the live stream that this is because of the shaking antennae. It has also been discussed on here before why this happens: Why does the video feed always fail during Falcon 9 ...
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1answer
3k views

What is the velocity profile of a Falcon 9 first stage landing?

How fast is it travelling as it comes into landing, before and after the re-ignition of the engine, and how quickly does it decellerate?? I would expect that it would be falling at about terminal ...
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4answers
40k views

What was the fate of the main core of the first Falcon Heavy launch?

February 6th 2018 saw the first test launch of SpaceX's Falcon 9 Heavy rocket. During the main core's landing on the marine landing pad, the connection was lost. As such it is not immediately clear ...
5
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1answer
184 views

Falcon Heavy launch to landing time

We are going to see the first launch of the Falcon Heavy in person February 6th 2018. What is the expected time from initial launch to landing of the two strap on boosters nearby?
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3answers
655 views

Will SpaceX land the first stage for the TESS mission on land or a barge?

I may have the opportunity to watch the upcoming Falcon 9 launch of NASA's TESS mission in person. Because of this, I'm curious whether I'll be able to watch the first stage of the Falcon 9 land back ...
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2answers
270 views

How, in the SpaceX Mars stack, do they plan to address de novo landing sites?

Given a new, unprepared "in the field" landing site for a rocket, what is the SpaceX strategy? Are the landing legs intended to be rated to handle that kind of instability? How can they possibly be? ...
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2answers
1k views

What is the turnaround time for SpaceX's barges?

I believe that currently, SpaceX only has two landing barges - one in the Atlantic (Of Course I Still Love You (OCISLY)), and one barge in the Pacific (Just Read The Instructions (JRTI)). How long ...
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2answers
3k views

On the Falcon Heavy, why are the side boosters using Ti Grid fins, but not the center core?

Elon Musk showed a picture of the almost ready to fly Falcon Heavy in the HIF (Horizontal Integration Facility, aka rocket barn). You can see the darker, larger grid fins on the side cores, and the ...
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1answer
1k views

Why are the new Titanium Grid fins not used on all Falcon 9 landings?

With the Block 4 version of the Falcon 9, one of the new features is the Titanium Grid fins, vs the previously used Aluminium fins. However, not all Block 4 flights have used the Ti vs Al fins. Is ...
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3answers
845 views

Why does one leg open slower than others on Falcon 9 landings?

I had noticed this before, but when landing, the legs do not open at exactly the same time or speed. For the CRS-13 mission, it was really obvious in this video around 50 seconds into the video. ...
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1answer
519 views

Why use skids for landing gear on an orbiter?

Why does the Dream Chaser use a skid as the nose landing gear? Wouldn't this increase the risk of accidents or damage to the runway when landing on a paved runway?
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1answer
235 views

Could a Falcon 9 booster return to Earth with its payload safely in an emergency? [duplicate]

Suppose that during the boost phase a Falcon 9 lost enough engines that it could not deploy its payload into a useful orbit or trajectory. Are there some scenarios where it could conceivably return ...
0
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1answer
178 views

Is it necessary for a vertical landing rocket to have the upper fuel tank empty?

You may imagine that having an upper fuel tank still having heavy liquid inside while landing, as today some reusable rockets do in a vertical attitude, may ease the machine falling on its side. Is ...
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0answers
216 views

Why haven't backup parachutes been used for spacecraft?

Skydivers normally wear a backup parachute. Apollo 15 survived with two out of three parachutes working properly. But wouldn't it be great to have a second deployment option, like skydivers do? The ...
0
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1answer
144 views

Is there some reason why ORBs don't land in a cylindrical cage? [duplicate]

Just watched Elon's video on How Not to Land an Orbital Rocket Booster (ORB), and I just look at that and wonder why they don't build a large metal cylindrical cage on the landing platform so if it ...
7
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1answer
340 views

How to optimize time of ignition for an on-orbit burn and/or coast phase on ascent?

I've been playing around linear tangent based guidance laws (specifically the old Atlas-Centaur Surveyor guidance, Apollo IGM and Space Shuttle PEG code) and while PEG has an option for a coast phase ...
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3answers
153 views

What is the soonest manned lunar landing date? [closed]

With the equipment development timelines we know about, what is the soonest date a manned lunar landing could take place?
3
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1answer
638 views

How do the F9 grid fins extend and rotate?

How do the F9 grid fins extend and rotate? When the vehicle launches they are flat against the surface of the vehicle. As the first stage begins reentry, the fins extend and start 'flying' the ...
7
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1answer
2k views

When will the first use of the SpaceX rocket grabber be on an ASDS?

SpaceX has been caught developing a thin flat robot to drive out on the ASDS deck and grab a landed stage. Some are calling it the SpaceX Roomba (Xoomba?) others are campaigning for the name Attitude ...
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1answer
1k views

What do the Teeth on the SpaceX Falcon Mod4 do?

Can someone explain the purpose of the 'teeth' seen in the last picture of this answer? Do they have a specific name? They look too far up to be used to grab anything since the rockets land ...
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2answers
15k views

How are the SpaceX Falcon 9 Mod 3 and Mod 4 grid fins different?

Elon Musk tweeted "Flying with larger & significantly upgraded hypersonic grid fins. Single piece cast & cut titanium. Can take reentry heat with no shielding." These have been commonly known ...
2
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1answer
461 views

Do the SpaceX ASDS orient themselves in a particular direction before a landing? Is there a “landing ellipse”?

The SpaceX Autonomous spaceport drone ships have longer and shorter direction, both for the flat, apparently land-able area, and total footprint in the water. The ships have vertical projections at ...
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1answer
430 views

From which direction was the Falcon 9 1st stage's landing approach (BulgariaSat-1)?

Looking at this cropped section of the screenshot described below, this is what I think I see: A: Shadow from the leg support on the right, but not the left. B: Scorch marks? C: Scorch marks? D: ...
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2answers
2k views

Why were three engines used for the F9 1st stage landing burn (BulgariaSat-1)?

As pointed out in the question What is the “emergency crush core”?, an Elon Musk tweet about the Falcon 9 1st stage landing following the BulgariaSat-1 launch says: Rocket is extra toasty and hit ...
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2answers
8k views

What is the “emergency crush core”?

In his tweet Elon Musk said: "Rocket is extra toasty and hit the deck hard (used almost all of the emergency crush core)" What is he talking about?
3
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2answers
314 views

SpaceX stage 1 reentry control?

In watching today's BulgariaSat-1 broadcast: It was mentioned that the drone ship had acquired the 1st stage as it was returning. I had always been under the ...
5
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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 ...
2
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2answers
213 views

Has F9 landed on ships in both the Atlantic and Pacific oceans?

Watching the CRS-11 hosted webcast starting at T -00:08:24 got me thinking about SpaceX launches on both the Atlantic and Pacific coasts of the US. Have there been ...

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