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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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Any ideas?: Calculating wet-mass and burn altitude for a Mars landing, using a Python simulation

In this post, I will explain the problem, provide some detailed context, and finally explain what I am searching for (what my question is basically). First of all, this should be quite a fun but ...
AvanD's user avatar
  • 21
6 votes
2 answers
488 views

Can Starship land on the moon horizontally?

Since the landing engines will be halfway up the body anyways, how about putting the landing legs to extend perpendicular and land with nose and main engine bay pointing towards their respective ...
Alonda's user avatar
  • 491
0 votes
2 answers
172 views

Starship maintaining tank pressure during reentry and landing

Starship relies on tank pressure to gain it's full structural strength. During reentry, the tank walls heat up, causing the ullage gas to heat up, causing pressure to rise. How will Starship prevent ...
Abdullah is not an Amalekite's user avatar
1 vote
0 answers
105 views

Are smaller rockets easier to land? [closed]

Is it easier to land a smaller rocket compared to bigger rockets?? Since they are lighter
Rocketsss's user avatar
1 vote
0 answers
94 views

How to approximate the force generated by Falcon 9 grid fins?

I'm interested in approximating the force generated by the grid fins on a Falcon 9 rocket during its descent phase. However, I currently lack specific data and equations for this calculation. Can ...
IsolatedSushi's user avatar
0 votes
0 answers
132 views

How to Model the Aerodynamics of Landing a Falcon 9

I'm currently working on a landing simulation for the Falcon 9. One of my primary tasks is to model both the environment and the rocket. In a previous rough simulation, aerodynamics were mostly ...
IsolatedSushi's user avatar
2 votes
1 answer
140 views

Propellant choices for a Mars landing; tradeoffs between LOX/CH4 and H2O2/RP-1?

What are the tradeoffs between LOX/methane and peroxide/kerosene for a Mars landing mission? In which ways are each better or worse than the other? I think the second one would more attractive for ...
Hartsfield's user avatar
11 votes
1 answer
3k views

What's the technology behind the floating landing pads?

We often see ships destroyed by storms and waves as tall as dozens of meters, so how does SpaceX keep these floating landing pads stable so it remains level during the landing? What if stormy weather ...
seilgu's user avatar
  • 221
3 votes
1 answer
254 views

When chopsticks catch the booster by the grid fins, what is the maximum vertical speed?

How much vertical speed can the grid fins handle before breaking off?
Star-SpaceX's user avatar
0 votes
1 answer
146 views

What caused the falcon booster landing failure during the CRS-16 mission?

On December 5, 2018 the Falcon 9 booster started spinning during the landing burn, and promptly appears to have soft landed on the ocean. While SpaceX stated that the booster could be reused it never ...
Starship - On Strike's user avatar
5 votes
1 answer
270 views

Why did the June 2016 SpaceX launch run out of propellant?

In other words, what caused SpaceX to miscalculate the amount of propellant required to safely land the booster. They had landed successfully on the drone ship in April. So what went wrong here? What ...
Starship - On Strike's user avatar
4 votes
1 answer
283 views

Does a RTLS (Return To Launch Site) landing deposit more soot on the booster than a drone ship landing?

First, it performs an extra burn (the boostback burn). Does this burn make a credible source of extra soot? Second, sometimes it appears to have flown through the second stage's exhaust plume. Does ...
Starship - On Strike's user avatar
7 votes
2 answers
3k views

Whats are the objectives of Artemis I?

Is there any major reason or research that can only can be done by humans or is it just so we can say "we did it again"?
Bored duck's user avatar
3 votes
1 answer
317 views

Can we land on either of Mars' moons?

Is it possible for anything to land safely of Deimos or Phobos? If so, are there any current or past proposals? If not, why? The only missions to Mars' moons I know of are Phobos 1 and Phobos 2 (both ...
user avatar
4 votes
0 answers
76 views

Did the dual booster landing timing change with USSF-44?

Falcon Heavy, on its fourth flight, landed its two core boosters via RTLS at LZ-1 and LZ-2. Previous F-H launches the two cores have landed at LZ-1/2 within a second or two of each other. So much so, ...
geoffc's user avatar
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21 votes
1 answer
3k views

Why was there only a single Falcon 9 landing on ground-pad in 2021?

According to Wikipedia, there was only one Falcon 9 booster landing on ground-pad in 2021, all other 30 launches at least attempted to land on a drone-ship. Comparatively, 2020 and (so far) 2022 both ...
Speedphoenix's user avatar
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4 votes
0 answers
95 views

Landing a 3-ton payload on the surface of Mars

I'm working on a university project about the construction of sustainable exploration camps on Mars. I want to land a 3-ton structure that will be used as a basis to build a shelter on the surface of ...
Elyo's user avatar
  • 141
3 votes
2 answers
2k views

Could Perseverance survive if Ingenuity failed?

They both landed successfully and ingenuity was deployed. Perseverance drove away, and then Ingenuity failed. Could Perseverance survive on its own?
user avatar
7 votes
1 answer
2k views

Could Ingenuity survive if Perseverance failed?

For the purposes of this question, we will assume that they both landed successfully. Ingenuity was deployed properly. Then, Perseverance drove away, and then Perserverance say hit a large rock and ...
Starship - On Strike's user avatar
0 votes
0 answers
102 views

Why can't the Falcon 9 first stage touch the water? [duplicate]

SpaceX is spending considerable effort to catch the Falcon 9 first stage onto a giant drone ship. I am aware that salt water ruins almost everything in the long run, but the first stage is a composite ...
Starship - On Strike's user avatar
10 votes
1 answer
300 views

How fast are Ingenuity's knees wearing out?

Each leg of Ingenuity has what I'll call a knee. After just a few flights, on 2021 May 10, NASA wrote: By plastically deforming and fatiguing as it absorbs energy, this flexure acts much like the ...
Camille Goudeseune's user avatar
1 vote
0 answers
182 views

Fuel profile for Apollo 11

I downloaded a dozen of NASA documents about post-flight analysis of Apollo 11 mission, but I cannot find a table or a plot of fuel usage and remains; Some of the documents which I found: http://www....
jumpjack's user avatar
  • 3,033
2 votes
2 answers
252 views

Why do New Shepard's drogue chutes just "hang there" for ten seconds before deploying the main parachutes? What happens during that time?

The cropped and sharpened screenshots below are from the Blue Origin video Replay: New Shepard Mission NS-19 Webcast after about 02:03:16 (T+08:07) and show a ...
uhoh's user avatar
  • 149k
2 votes
0 answers
160 views

What are the innovative aspects of New Shepard's "retro-thrust system on the bottom of the capsule"?

Background: The final velocity of the capsule after the main parachutes are deployed is a balance; it should always be slow enough that the crew is not injured and for reusable capsules and for space ...
uhoh's user avatar
  • 149k
3 votes
1 answer
920 views

Hard (15mph) landing, no retrorockets fired?

Today’s (12-11-21) Blue Origin New Shepard crew landing looked to be at full 15mph with no evidence of retro rockets firing or slowing of the capsule. Did they fire?
BryonS's user avatar
  • 39
6 votes
2 answers
2k views

Is it possible to propulsively land an SRB?

I am wondering if it is possible to propulsively land a solid rocket booster after it detaches from the core booster. I know you could use thrust termination ports to stop thrust, but it would drop ...
Duck's user avatar
  • 327
1 vote
1 answer
192 views

Why does the New Shepard Crew Capsule sometimes deploy 3 parachutes and sometimes deploys only 2 parachutes?

The NS-18 capsule on Oct 13 2021 (with William Shatner aboard) landed with 3 parachutes deployed. In contrast, The NS-12 capsule on Dec 11 2019 landed with 2 parachutes deployed. Strangely in both ...
Paul Tweedlie's user avatar
13 votes
0 answers
340 views

Which kinds of survival equipment does Crew Dragon have, in case of an emergency landing?

Soyuz spacecraft has various survival equipment for different cases of emergency landing. The cases include water landing, desert landing, snow winter landing (crews have special winter suits). They ...
Heopps's user avatar
  • 9,061
2 votes
1 answer
146 views

What flag is flying over the landing site of the Shenzhou 12 crew astronauts returning from Tiangong? What does it say?

NBC News has a short video clip Astronauts Return After 90-day Mission To China's Space Station A trio of Chinese astronauts touched down in the Gobi Desert after completing China's longest space ...
uhoh's user avatar
  • 149k
3 votes
0 answers
128 views

Why did the last two NASA rovers land in craters?

Perseverance landed in Jezero crater, Curiosity in Gale crater. Do craters have any specific properties that make them desirable landing sites for rovers?
usernumber's user avatar
  • 5,048
3 votes
1 answer
649 views

How do SpaceX intend to transport their starship/super heavy?

One of the design constraints of the Falcon 9, its skinniness, is to allow it to be transported by truck back to the launch site. Falcon 9 is 3.7 metres in diameter, whereas Starship and the super ...
Ingolifs's user avatar
  • 6,458
48 votes
1 answer
5k views

Why were the Space Shuttle Orbiter's landing gear not level?

Looking at an image of the orbiter on the ground, it's obvious the nose landing gear is positioned higher than the other landing gear in the wings, making the nose of the orbiter droop down. As far as ...
DrKlutz's user avatar
  • 583
3 votes
1 answer
174 views

SpaceX live broadcast of booster & boat's eye view of the GPS III Space Vehicle 5 were both uninterrupted; have they make some upgrades to the system?

This answer to Why does the video feed always fail during Falcon 9 landings? shows that SpaceX seems to be "getting better at" or "less shy about" broadcasting continuous live ...
uhoh's user avatar
  • 149k
0 votes
1 answer
193 views

What independent evidence is there that the Zhurong rover landed on Mars in May 2021? [duplicate]

The China National Space Administration announced, on the 17th of May 2021, that the Tianwen 1 mission landed the Zhurong rover on Mars, with the landing taking place on the 15th of May 2021. What ...
user avatar
6 votes
0 answers
123 views

Other than safety qualifications, was there any technical/engineering reason why propulsive landing was cancelled for the DragonV2?

The Dragon V2 cannot perform a propulsive landing. But the Starship will be making propulsive landings. Why?
RNG's user avatar
  • 385
4 votes
0 answers
833 views

What are the G forces the Dragon 2 crew experience during splashdown? And what is the seat angle for the current configuration of 4 astronauts?

The Dragon 2 has a crew capacity of seven, but, NASA decided to change the specification for the angle of the ship’s seats due to concerns about the g-forces crew members might experience during ...
RNG's user avatar
  • 385
3 votes
0 answers
177 views

Why does the landing trajectory of a blunt body take an S shape in the lower atmosphere?

I coded some Matlab plots of altitude vs time for the re-entry of a point mass (so no aerothermo analysis included). In all the trajectories, there is an S shape closer to the ground. Why? Please ...
RNG's user avatar
  • 385
6 votes
3 answers
494 views

Is it possible to know where the Long March 5B will be landed approximately?

I have read some articles about the uncontrolled space rocket the Long March 5B including some space tracker websites but none of them give any useful information about the rocket landing. Is it ...
GAD3R's user avatar
  • 171
8 votes
1 answer
669 views

Did Yuri Gagarin really telephone officials in Moscow to come pick him up?

A farmer and her daughter observed the strange scene of a figure in a bright orange suit with a large white helmet landing near them by parachute. Gagarin later recalled, "When they saw me in my ...
DrSheldon's user avatar
  • 48k
1 vote
0 answers
34 views

Why did SN10 rest at a slight incline after landing? [duplicate]

Recently when SpaceX's SN10 landed, before it exploded, it sat still on the ground for a few minutes. It appears to be resting at a slight incline. Why is this?
spraff's user avatar
  • 171
-7 votes
3 answers
248 views

Why did the communication cable of the Perseverance rover make an angle so great with the other three cables? [closed]

How can you explain the weird position of the communication cable in the image below? The Perseverance about 20 meters above the surface of Mars. The communication cable, between the rover and its ...
azot's user avatar
  • 981
3 votes
1 answer
466 views

How many spacecraft bounced like a ball on Mars? How many tried to?

The answer to Why a rover bounces after landing on Mars? is "the Mars Exploration Rovers" of which there were two. However, they might not be the only spacecraft to use bouncing like a ball ...
uhoh's user avatar
  • 149k
-3 votes
3 answers
277 views

A mysterious flash of light on the surface of Mars while the Perseverance rover was landing. What can it be? [closed]

A mysterious light that lasted a fraction of a second appeared on the surface of Mars while the Perseverance rover was descending. What can its source be? See: Perseverance Rover’s Descent and ...
azot's user avatar
  • 981
-2 votes
4 answers
546 views

The Mars parachute opened against a black sky on Earth but a blue-magenta sky on Mars during Perseverance landing. How is it possible? [closed]

I have discovered two images (see below) and I do not find an explanation for the different color of the sky as seen from below the parachute just starting to deploy. The video with the test performed ...
azot's user avatar
  • 981
62 votes
4 answers
12k views

How were Perseverance's cables "cut" after touching down?

In the NASA conference today regarding Perseverance's successful landing on Mars, they talked about how you can see the cable that held the rover in this picture below (I circled the cable). I'm ...
F16Falcon's user avatar
  • 703
7 votes
0 answers
72 views

What are the rules for callouts during mission landings?

I remember hearing at one point that in the control room at JPL, only the GN&C Lead is allowed to make the announcement for touchdown. It's because they don't want someone prematurely (and ...
Phiteros's user avatar
  • 5,626
5 votes
1 answer
281 views

Has there ever been an attempt or serious consideration for spacecraft to land on Mars without an ablative-type heat shield?

My answer to Do exploration spacecraft enter Mars atmosphere against Mars rotation, or on the same direction? lauds the use of ablative heat shields for minimizing radiative heating of a spacecraft by ...
uhoh's user avatar
  • 149k
7 votes
2 answers
578 views

How tall are the "cliffs of the delta" in the Perseverance rover's landing ellipse?

edit: For all the cliff-doubters in comments, here's a quote of Project Scientist Ken Farley in the new NASA video After the Landing: An Update about NASA’s Perseverance Mars Rover after ...
uhoh's user avatar
  • 149k
34 votes
8 answers
9k views

Why not land SpaceX's Starship like a plane?

I get the reasoning behind designing Starship to land upright. It doesn't require landing gear and the turnaround is expected to be much faster. But I'm beginning to question that logic. I think the ...
loweryjk's user avatar
  • 457
17 votes
1 answer
2k views

Are launch windows to Mars avoided if they result in landings during dust storm season?

This comment suggests that orbit before descent to Mars' surface allows a mission to delay the landing if the weather conditions are bad. I think that Tianwen-1 will be the first to put a lander rover ...
uhoh's user avatar
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