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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77 views

Out of 47,108 lines in the Satcat why are there exactly two lines with launch of the year of 000?

This looks like this answer because that's where I found this. Celestrak offers a copy of a Satcat from which a tabulation of space objects can be gleaned: https://celestrak.com/satcat/search.php ...
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Could a tank of water under the launch pad be used instead of a flame trench?

A flame trench is a massive expensive thing that needs constant repair. After each launch, concrete and steel suffer cracks, chips, melting etc., and require expensive, time consuming repair. Would it ...
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680 views

US states with most space launches?

Some space launches are made from Florida, some from Texas, some from California and so on. Which US states and territories had the most orbital space launches in all space history? I mean launches ...
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Is there any six stage rocket? [duplicate]

In all the history of the rockets was there any rocket with six or more stages? I know ASLV, Minotaur V and Jason sounding rocket had five stages but I don't know any rocket with six stages.
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What happens to where umbilical lines are connected when a rocket lifts off?

I've read about umbilical lines in rockets but I don't understand what happens with the places where each umbilical is connected to the rocket once it lifts off. I guess they are sealed in some way in ...
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(U.S.) What paperwork do civilians need to send items into orbit or beyond?

Are civilians allowed to send objects into orbit, or even leave orbit, like send something to the moon or deep-space? If they can what kind of paperwork/waivers/licenses etc. need to be obtained ...
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Conceptual reusable orbital launch engine prototype for nanosatellites [closed]

I have realised that the process in which we go to space is highly inefficient and we should create a hypersonic spaceplane which take offs and goes to low earth orbit to release nanosatelite and ...
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2answers
113 views

What is the number of launches by year?

How many orbital and beyond-Earth launches have been done every year? There is a Wikipedia article: https://en.wikipedia.org/wiki/Timeline_of_spaceflight But it doesn't contain enough data. There is a ...
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How does Falcon 9 sit on the launch pad? [duplicate]

Before launching, how is Falcon 9 sitting on the launch pad? Does it sit on the retractable legs? Does it sit directly on the outer body? I guess it is not sitting directly on the engines
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1answer
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Number of satellites launched per year?

How many satellites were launched every year? Similar question Number of satellites launched by decade? Resources for number of orbiting and active satellites by year?
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Number of satellites launched by decade?

How many satellites were launched each decade? Including satellites of Mars Moon Venus Sun etc Similar question Number of satellites launched per year? Most busy times in space launches by decade?
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967 views

Why is RocketLab capable of an order of magnitude more launches from two New Zealand launch pads than a single US launch pad?

In this video: Rocket Lab - In Focus Launch 10/28/2020, at 13:15, it is written on screen that RocketLab is capable of launching 120 satellites per year from Launch Complex 1, pad A & B, New ...
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Can satellites really be launched within hours with RocketLab?

Watching the Rocket Lab - In Focus Launch 10/28/2020 video linked below, there is a section at 12:50: The ability to deploy new satellites to precise orbits in a ...
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g-forces entering and leaving atmospheres, how would they vary from one body to another?

I was wondering how launching from and returning into atmospheres of other bodies such as Mars, Venus, Titan, etc. would differ from Earth's. Specifically, I am wondering how many g's would be ...
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3answers
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Would it have been possible to launch rockets in secret in the 1960s?

I had a discussion the other day with a friend who claimed that many more cosmonauts were lost during the the Space Race than the Soviet government publicly admitted. He argued that it was easy for ...
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Blue origin rocket holding & releasing mechanism

How blue origin rocket holding in launch pad& releasing @ the time of lift off? Please explain the mechanism
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1answer
65 views

How throttle changes affect calculations of thrust?

So, for constant throttle setting equation to calculate thrust looks like $ \ F = \dot{m}_\mathrm e V_\mathrm e + (p_\mathrm e - p_0) A_\mathrm e$ But if we are looking at flightclub.io simulation, ...
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1answer
109 views

Main reasons for a 2nd burn of a 2nd stage in Earth orbit?

I have seen that sometimes the second stage of a rocket is turned on and off, then after a while turned on and off again. What are the main reasons that second burn of a second state is initiated ...
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348 views

Simulating launch velocity of falcon 9

Help! I finished my numerical simulation of falcon 9 launch in google sheets, where I calculate all the value changes with time. But, when I looked at real launch to compare the values, I got really ...
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3answers
2k views

What are the most-delayed missions that eventually launched successfully?

I author this question off of two failed cross-country trips to see NROL-44 and three lost bets on whether it'll launch. As ULA scrubs this Delta IV Heavy yet once again, I wonder, has there ever been ...
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5answers
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Did anyone ever launch a rocket, filmed by another rocket in mid air?

I recently analyzed some SpaceX launch footage (a Starlink deployment on September 3). I noticed a switch in camera perspective at T+00:02:20: from cameras on the ground to those attached to the ...
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1answer
95 views

Is there a G-force curve estimated for a SLS launch?

Has the G-force curve for the launch of Block 1, Block 1B, or Block 2 (crew and or cargo) Space Launch Systems been determined? If there is no published estimates for the curve, is the estimate of the ...
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1answer
156 views

Fastest rocket to reach space?

Spaceloft XL can reach space - 100 km - in 60 seconds So I wonder which rockets can reach that limit fastest Balloon-launched sounding rockets count but separately (from the moment they launch from ...
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1answer
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Space launches with video camera?

Are there any other rocket launches featuring video (selfie) cameras on the rocket than Falcon 9 and Electron? Falcon 9 has some 5 camera and Electron has 3 camera
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How much more cost efficent are SRB's over the main engine?

Why use SRBs instead of a simpler rocket design that dispenses with SRB's and instead has a bigger main engine? The Saturn V escaped earth's gravity just fine without boosters. Since then though SRBs ...
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1k views

How much of the energy of a rocket ends up as a noise?

Rocket launches are notoriously loud. So much so that measures are taken to prevent the noise/vibrations from damaging the rocket, the pad, or basically anything else within a few hundred meters. How ...
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Space burials in graveyard orbit?

I understand a very small part of space burials are going into deep space. And a good part of them go into suborbital flights. But are there any space burials sent to graveyard orbits? Are any space ...
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8answers
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Where to look for next rocket launches?

Is there any place on the internet showing the upcoming rocket launches? Like the launches next week or next month
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Roll Maneuver in SpaceX Demo-2 Launch?

I couldn't see a roll maneuver early in the launch of the demo-2 mission, and this left me wondering if SpaceX skipped the maneuver. Would they do the pitchover without roll? Also, I've noticed in one ...
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1answer
153 views

How does a rocket go from gravity turn to orbit?

A rocket launch normally begins with a roll to align with the orbital plane and a pitch to allow gravity to gradually torque the rocket down as it climbs. The combined roll and pitchover maneuver last ...
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How many good days per year Cape Canaveral has?

On average, how many days per year have good enough weather for a space rocket launch (not ICBM) at Cape Canaveral?
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When will STP-3 launch with the new optical space coms test and why is it late?

Wikipedia's Space Test Program; Upcoming activities; STP-3 says: The STP-3 mission is scheduled to be launched on a ULA Atlas V 551 rocket in 2020.[23][24][needs update] It includes the STPSat-6 ...
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2answers
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In what ways is helium used on modern launch vehicles?

Helium is a fairly rare material and does not remain in the atmosphere. I'd like to know the uses of helium on modern launch systems? Do most launch vehicles use helium in several different ways, or ...
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2answers
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Can Oberth bike? Is biking up and down a series of hills a good real-world analogy for understanding either the Oberth effect and/or gravity drag?

When faced with a series of ups and downs while riding a bicycle, I try to pedal like mad near the bottoms to gain as much speed as possible. I do this due to some vague, ill-formed notion that either ...
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1answer
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Find the jump condition of the mass costate of a Launch Vehicle ascent problem solved via an indirect method (Pontryagin Minimum Principle)

I'm trying to solve a trajectory optimization problem for a class of problems like the old Altas-Centaur SLV3 Centaur launch vehicles. Those are a stage and a half design where the 2 LR-87 engines ...
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2answers
165 views

Most busy times in space launches by decade?

If anyone has the curiosity and time and possibility to run the scripts, I think it's interesting to see the most busy day, week, month and year, by decade. Most busy week of 1960s then most busy week ...
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1answer
157 views

What prevents SpaceX from increasing the cadence of launches?

Many companies can afford and buy expensive launches (Ariane etc) so they prefer SpaceX to save money. Many other companies can't afford Ariane launches but they would afford Falcon 9 launches. Lower ...
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1answer
126 views

What is the longest period of consecutive daily space launches?

What is the largest number of days with at least one space launch every day? Also what is the largest number of days with at least a launch per day on average? For example two launches yesterday and ...
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1answer
94 views

Largest gap between two consecutive space launches?

What was the largest period without space launches after say 1970? I had to chose a random year because I guess in the first years of the Space Age the gaps were the largest anyway. Related questions: ...
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1answer
135 views

Most busy times in US space launches?

In the history of USA space era, when did it have the most launches in the same day, week, month and year? Related questions: What was the most busy week in space launches? What is the longest period ...
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2answers
2k views

What was the most busy week in space launches?

In the history of space launches, which week has had the most space launches? It would be also nice to know the second and third place. I think its also interesting to ask about most busy month and ...
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Why did Tianwen-1 payload separate upside down?

China recently launched its Mars exploration mission Tianwen-1. Separation of the payload from the second (or third?) stage can be seen in a post-launch news clip. In this clip, the computer animation ...
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Was ULA's mobile clean room on the ground floor or up near the top of the rocket? What were the logistics for getting Perseverance up there?

Spaceflight Now's ULA’s Atlas 5 is NASA’s go-to rocket for nuclear-powered space probes quotes Tory Bruno, president and CEO of United Launch Alliance: Bruno said the mobile clean room set up inside ...
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1answer
225 views

Did the Perseverance rover's Atlas 5 really “leap off the pad”? If so, was it because the payload is tiny, or because it's going to Mars?

Spaceflight Now's ULA’s Atlas 5 is NASA’s go-to rocket for nuclear-powered space probes quotes Tory Bruno, president and CEO of United Launch Alliance: “This rocket is going to leap off the pad with ...
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1answer
609 views

Did UAE's Al-Amal (Hope) Emirates Mars Mission (EMM) launch directly into an interplanetary trajectory or did it spend some time in LEO?

Time Magazine's UAE's Mission to Mars Launches Successfully—a First for the Arab World says that the Mars orbiter named Al-Amal (Hope) or Emirates Mars Mission: ...blasted off from the Tanegashima ...
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Federal Limitations on Model Rocketry in India

I am hoping to find information on the rules regarding model rocket launches in India. How high can I fly? How heavy can a custom rocket be? Can I legally make and fly custom engines/motors?
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1answer
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Will the Mars 2020 rocket be visible in the night sky?

When a Space X rocket was launched towards the ISS this year, the rocket could be seen in the night sky in Europe. The information as to where and when to look in the sky was even easily available ...
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1answer
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How is 'space junk' monitored pre-launches and when picking satellite orbits?

There is a bunch of junk orbiting right outside the atmosphere of the Earth, an issue that gets addressed more and more as space travel develops. How do they monitor the movement of these to avoid so ...
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Has California implemented its “rocket tax” yet?

Questions from 2017: California's rocket tax "by the mile", how would that work exactly? What expenses and risks might the state of California incur that might partially justify a new &...
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What is “TFR” in the context of operating a marine radar on top of a “water tower” at a launch site?

This answer to What is this propellor-like object on top of the SpaceX Hopper? includes the following: FCC filing: Space Exploration Technologies Corp. 0459-EX-CN-2020: ...d) List any natural ...

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