Questions tagged [launch]

Questions regarding the takeoff or the liftoff phase of the flight of a rocket and the set of activities required for preparation of the launch vehicle leading to it.

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How much deltaV would it take to launch from the top of mount Everest straight up then circularize at 200km once in space?

I realize there are several similar questions, but i didn't see mention of the amount of deltaV needed beyond saying there is a slight benefit that is more than offset by dozens of social/political/...
Rasip's user avatar
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Example using NASA GMAT to model a sounding rocket launch

I'm wondering if anyone has an example GMAT script that describes a sounding rocket launch and return. Not necessarily looking for high fidelity but just something that shows the parameters for a ...
Eric Smith's user avatar
2 votes
1 answer
207 views

Why are rockets launched from speed 0 instead of giving them a speed boost with a terrestrial vehicle? [duplicate]

One thing that was very clear when playing Kerbal Space Program is that you need a lot of fuel to launch a rocket. What's worse, the more fuel you add, the heavier the rocket gets, requiring even more ...
Shahbaz's user avatar
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3 votes
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108 views

Does Starship perform a launch tower avoidance maneuver?

Does Starship perform a launch tower avoidance maneuver? If yes, is this accomplished using gimbaled raptor engines or RCS rockets? How far laterally is the Starship axis shifted by this maneuver and ...
Woody's user avatar
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4 votes
1 answer
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How do space launch providers calculate how many millipeople a rocket launch could kill?

I was intrigued by this post which states... To get a license you have to show that your launch will kill no more than ~1 milliperson, which usually means not flying close to population centers. I ...
phil1008's user avatar
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How many U.S. launch vehicles have failed on initial launch? [duplicate]

I'm doing some research about U.S. launch vehicle failures, and particularly failures occurring during the first vehicle launch. I'm trying to get some data about how frequently failures like this ...
Gil's user avatar
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What conferences have technical sessions that cover credible and transformative alternatives to chemical-rocket-based launch?

Constraints Some examples of such technologies are described on Wikipedia's Non-Rocket Spacelaunch page. But, to clarify a bit further... I found list of such technologies in Figure 2.1 of a document ...
phil1008's user avatar
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4 votes
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What are some examples of stepping-stone applications that would be suitable for iteratively advancing mass driver technology?

Since their inception, rockets have improved over many design iterations. Each iteration was funded because it unlocked some kind of new value, such gaining an advantage in a geopolitical conflict, ...
phil1008's user avatar
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Can an orbital rocket have an airplane first stage? [duplicate]

The first stage of SpaceX's Nov 18 Starship launch was the Super Heavy. According to the Wikipedia page, it packs 3,400 tones of fuel. In the launch video, it shows the rocket reaches 27 km of ...
paki eng's user avatar
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10 votes
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Do larger rockets tend to have a better mass ratio due to the square cube law?

Do larger rockets tend to have a better mass ratio due to the square cube law? I mean, larger tanks have a better surface-to-volume ratio, so their weight-to-volume should be improved
Krzysiek's user avatar
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How can I know which direction a launch will be?

I'm in SOUTH FLORIDA and try to watch all the launches from here. Sometimes, the rocket seems to head south and come right overhead. How can I tell what direction a launch will take? Thank you. M
user51798's user avatar
2 votes
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What orbital inclination of a HAVOC mothership would optimize the success of an abort-to-orbit?

In Phase 3 of NASA’s HAVOC proposed mission for a buoyant probe to the Venusian atmosphere, a crewed atmospheric probe de-orbits from an orbiting mothership. The probe is a solar-electric propelled ...
Woody's user avatar
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3 votes
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145 views

Energy Needed for Lunar Lander to Ascend?

Is it possible to calculate how much energy was expended when the Apollo 11 lunar lander ascended from the Moon's surface to join the Command Module in lunar orbit? Many relevant parameters for the ...
David_B's user avatar
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2 votes
2 answers
225 views

In theory, could this redesign of the launch profile reduce fuel use? [duplicate]

This is a purely theoretical question, because I suspect that trying to build a launch system of this sort would pose its own set of very complex problems. That said, the Wikipedia page for the ...
dgnuff's user avatar
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-1 votes
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Higher density medium tube from sea level to space for travel

Is it theoretically possible to build a strong sealed tube from Earth's sea level all the way to Space, fill it with a medium (such as water) that has a higher density than humans. And then humans ...
Saurabh Goyal's user avatar
2 votes
0 answers
146 views

Is the rocket exhaust plume at liftoff of a liquid fuled rocket cold? Can it condense? [duplicate]

I try to understand what the exhaust cloud on the ground from the start of Starship consists of. Of course it was unusually mineral-rich, but I try to understand whether we saw much else, apart from ...
Volker Siegel's user avatar
5 votes
1 answer
416 views

Was the exhaust cloud at the Starship launch mostly pulverized launchpad?

The launch of Spacex Starship on April 20 2023 looked pretty normal on first sight, apart from some engines not running, and some concrete flying around. The huge exhaust cloud looked normal, because ...
Volker Siegel's user avatar
22 votes
2 answers
3k views

Has the cause of a rocket failure ever been mis-identified, such that another launch failed due to the same problem?

When a rocket launch fails, typically launches for that rocket type are halted while an investigation takes place to identify and correct the root cause of the failure. However, it is possible that ...
kgutwin's user avatar
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1 vote
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Why didn't SpaceX scrub the 4/20 Starship launch when they saw the launch pad being shredded?

While Starship took to the skies on its maiden flight, the slow build of power started to devastate the launch pad (or Stage Zero as SpaceX refers to it) and surrounding area with debris. Though ...
Abdullah is not an Amalekite's user avatar
1 vote
1 answer
511 views

Why was the launchpad not destroyed during Super Heavy test firings?

It's becoming clear now that the 4/20 launch devastated the launchpad, leaving a massive crater and flinging debris - perhaps into the booster itself. But why did this not happen during test firings ...
Abdullah is not an Amalekite's user avatar
1 vote
1 answer
240 views

Were Rocket Lab’s Electron rocket engines damaged on impact?

Were Rocket Lab’s Electron Mission 26 rocket engines damaged on impact? The photo of the recovered Electron Rocket https://arstechnica.com/science/2022/05/rocket-lab-catches-a-1-ton-booster-falling-...
Woody's user avatar
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-1 votes
1 answer
127 views

Why did the maiden flight of H3 fail?

Recently, JAXA (Japan Aerospace Exploration Agency) finally launched the ALOS-3 (Advanced Land Observing Satellite-3) after more than 2 years of delay. On then all seemed to be going well on the first ...
Starship - On Strike's user avatar
2 votes
1 answer
263 views

Why do the Falcon 9 fairings have soot on them?

On nearly every SpaceX webcast since 2020 they explain that the Falcon 9 booster has soot on it because, during the entry burn, it flies through its own exhaust plume very quickly depositing the ...
Starship - On Strike's user avatar
11 votes
3 answers
3k views

How can you make a rocket quieter?

Usually during a rocket launch on Earth, lots of water is poured to decrease the sound (deluge discussed in Wikipedia's Sound suppression system) and some other methods are used. What I am looking for ...
The Rocket fan's user avatar
4 votes
0 answers
207 views

What caused the H3 rocket to squeal so loudly after its launch abort?

Immediately after the H3 rocket's first launch attempt was aborted, a loud squealing noise could be heard on the live stream. What was this? The only thing I could find about it when searching the ...
Infinite_Maelstrom's user avatar
1 vote
0 answers
78 views

Is using a variable Isp (constant power & acceleration) more efficient than a constant Isp when launching?

So after I wrote a particularly poorly received answer about variable specific impulse, based on discussion I read here, I realise I may have misinterpreted what was being discussed in that thread. ...
Infinite_Maelstrom's user avatar
0 votes
5 answers
469 views

Is the launch of a rocket slow because the change in velocity (delta_v) should be as small as possible because of energetic reasons?

Does it make sense to keep the launch of a rocket slow because the change in velocity (a.k.a. delta_v) should be as small as possible because of energetic reasons?
FalconHeavy321's user avatar
0 votes
1 answer
66 views

Does the payload capacity of an interplanetary launch rocket increase with decreasing fuel mass or with increasing escape velocity?

Does the payload capacity of an interplanetary launch rocket increase with decreasing fuel mass or with increasing escape velocity? I was thinking that the escape velocity has nothing to do with it ...
FalconHeavy321's user avatar
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1 answer
98 views

Are most launches for science missions?

Are most space missions launched for scientific purposes? I had thought so, but during a group discussion, someone suggested most are actually for commercial purposes. Are they correct? Thanks!
FalconHeavy321's user avatar
3 votes
0 answers
224 views

How much of a rocket energy is needed to overcome aerodynamic drag?

this question How much of a rocket's energy is used to achieve altitude vs horizontal velocity? addresses the energy split of kinetic vs. potential energy to get to space - and to stay there. We ...
henfri's user avatar
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3 votes
1 answer
166 views

What did I see in the SpaceX Starlink launch stream 12/17/2022

I was wondering. I just watched the Starlink launch from 12/17/2022 (Starlink Group 4-37). At about +3:53 into the launch, on the first stage re-entry, there was a weird anomaly, which kinda looked ...
James Higley's user avatar
4 votes
1 answer
140 views

Falcon Heavy will launch Europa Clipper - are details available for public?

NASA Europa Clipper spacecraft will be launched by Falcon Heavy launcher. But very small amount of details can be found, to my surprise. For example, I've been guessing will additional solid-fuel kick ...
Heopps's user avatar
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2 votes
0 answers
180 views

HTOL vs VTOL first stages

For a generic launch vehicle, would Horizontal Take off be better than VTOL like most orbital launch vehicles?
AnarchoEngineer's user avatar
5 votes
1 answer
151 views

What is the reason for the short-duration cutouts in the Artemis I launch window?

Near the end of the hold at T-10 the announcer noted that, in determining a new T0, the launch team had to consider "various cutouts in the launch window, varying from 1 seconds up to a minute&...
Ludo's user avatar
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2 votes
2 answers
239 views

Where do the separated stages of ISRO Launch Vehicle Mark 3 (LVM3) end up?

ISRO Launch Vehicle Mark 3 (LVM3) is a three stage launch vehicle: First stage – S200 Boosters Second stage – L110 Third stage – C25 Where do each of these stages end up after a launch?
Ritesh Singh's user avatar
11 votes
1 answer
768 views

What does a flight path angle of zero degrees mean at launch?

Total beginner here so please be gentle. I'm looking at the Apollo 11 flight path angle plot from Apollo Saturn V Postflight Trajectory AS 506 which shows a zero degree angle at launch. Isn't path ...
Mark Stevenson's user avatar
3 votes
0 answers
136 views

What is this thing that goes zipping past the Electron launch?

Watching the Electron launch 07 October 2022 on https://www.rocketlabusa.com/live-stream, what do I see in the video at T + 9:12, just after they confirm secondary engine cut off? I thought it was a ...
kmort's user avatar
  • 131
-2 votes
2 answers
422 views

Are the Raptor engines too numerous and close together on Booster 7?

SpaceX is in the process of scaling up their highly successful re-usable Falcon first stage to a much larger version with more powerful engines for their Starship program. These new Raptor engines ...
Robert DiGiovanni's user avatar
1 vote
0 answers
206 views

In the event of SRB ignition failure, could jettison of the other “lit” SRB prevent catastrophe?

Solid Rocket Boosters (SRBs) are popular launch boosters, used on the Space Shuttle, Ariane 5, Atlas V and SLV. However, SRBs have a number of failure modes, most of which result in catastrophe. ...
Woody's user avatar
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8 votes
1 answer
2k views

What is the Criteria of Technology Readiness Level 9?

On NASA website it says to get TRL 9 the technology must be flight proven, now, to be "flight proven" is there any specific criteria for that? like a defined amount of time of functioning, ...
Mohamed Abduljawad's user avatar
3 votes
3 answers
1k views

How to Get Space Heritage for a Component

If a developed electronics/board/chip/etc. wanted to have a space/flight heritage, is there any typical way to get that? Edit: As some mentioned I was not clear, I'm talking from a manufacturer point ...
Mohamed Abduljawad's user avatar
1 vote
0 answers
85 views

Control used during orbital insertion?

Which control is usually active during the orbital insertion phase of launch vehicles? Once the velocity requirement for orbital insertion is met, engine is switched off RCS usually takes care of ...
nik's user avatar
  • 105
1 vote
1 answer
343 views

Horizontal vs Vertical Takeoff

What is the reason that some space planes take off with the help of a rocket and others take off with nothing but their own engines. For example the X-37 uses an additional rocket while the VSS Unity ...
Varun W.'s user avatar
  • 129
0 votes
1 answer
230 views

Why aren't clusters of F-15 or SR-71 engines used for a boost stage for rockets? [duplicate]

A cluster of say 8 F-15 or SR-71 engines in my mind could make a viable first stage for a small rocket. Second they can land the stage back to the ground and if my guess is right they could go to up ...
user3660060's user avatar
3 votes
0 answers
120 views

Reaction control system testing

How are RCS (reaction control systems) for Launch vehicles usually tested? After going through some literatures, I came across two different testing schemes, Leans more towards testing the Cold gas ...
nik's user avatar
  • 105
3 votes
0 answers
151 views

How does US crewed launch abort coverage "jump" the ocean in an instant?

As I understand things, the Commercial Crew Program stipulates full abort coverage from pad to orbit. An abort to the middle of the Atlantic ocean is understandably not acceptable. Watching the OFT-2 ...
BrendanLuke15's user avatar
5 votes
2 answers
2k views

Are nozzle plugs taken out before launch or are they ejected upon ignition?

Inspired by this question. For most orbital launch vehicles, do their engines have nozzle plugs installed and what happen to them at launch? Are they manually removed during the prelaunch/rollout or ...
WarpPrime's user avatar
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8 votes
3 answers
1k views

Can something like SpinLaunch actually work?

Can something like SpinLaunch actually work? It appears that Spinlaunch attempts to accelerate a capsule to very high speeds and then basically throw it into space. A regular rocket is moving slowest ...
user4574's user avatar
  • 525
-1 votes
1 answer
156 views

Could we launch from the moon to another planetary body? [closed]

Would it be possible with currently rocket technology or technology towards the end of its development (ex. SLS, Starship, New Glenn, etc.) to launch from the moon. Of course, we would send down a ...
Starship - On Strike's user avatar
-1 votes
1 answer
244 views

Can we launch from the moon?

Would it be possible with currently rocket technology or technology towards the end of its development (ex. SLS, Starship, New Glenn, etc.) to launch from the moon. Of course, we would send down a ...
Starship - On Strike's user avatar

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