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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5
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1answer
214 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
100 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: ...
4
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1answer
137 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 ...
2
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1answer
293 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
125 views

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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87 views

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 ...
26
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3answers
4k views

Why do some rockets not ignite all their engines during liftoff? (GSLV MK3 LV)

As I understand it, a rocket should produce its maximum thrust on liftoff. As time progresses, the mass of the rocket will decrease, but since the engines produce the same thrust, the rocket will ...
6
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1answer
623 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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54 views

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
187 views

Acceleration Profile of PSLV and GSLV

What is the way to find out the acceleration profiles of IRSO's GSLV and PSLV from launch until achieving orbit?
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4answers
5k views

What is the largest hurdle of the mission to Mars?

I was shocked when I recently found out just how long it takes to get to Mars. I've been conducting a very informal survey amongst peers of how just how long people think it takes us to travel to Mars....
6
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1answer
401 views

What stole the INSPIRE cubesat launch opportunity, and will there be another?

Doing research for this answer about interplanetary cubesats, I watched the NASA Jet Propulsion Laboratory YouTube channel video CubeSats (live public talk) of a talk by Dr. Andrew Klesh, Chief ...
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2answers
836 views

SpaceX Falcon-9 fairing heating during launch?

In watching the SpaceX SES-12 launch last night, I noticed what looked like the fairing of the rocket glowing a bit a while after launch. This was most obvious in the SpaceX video SES-12 Mission ...
14
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1answer
1k views

Do any spacecraft use carkeys?

The basic idea behind a key for a vehicle is to keep an unauthorized person from using your car to go somewhere else - probably further away from you than you would like your transportation to be. I ...
4
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1answer
112 views

Crew dragon falcon 9 first stage shut down

Crew dragon falcon 9 first stage shut down around 6700 km/hr and starlink shut down around 7900 km/hr, but around the same time. Is this because the crew dragon weighs more?
2
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1answer
58 views

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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0answers
162 views

What light was the Falcon 9 grid fin occulting in todays SpaceX Nusantara Satu Mission live broadcast?

What light was the Falcon 9 grid fin occulting in todays SpaceX Nusantara Satu Mission live broadcast? I backed up the time slider on the YouTube live broadcast and snapped some screen captures, ...
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0answers
61 views

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 &...
22
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1answer
2k views

What are the small gas jets at the rims of the Space Shuttle Main Engines?

As can be seen in close-up footage of SSME ignition, such as the video below, there are small jets of an unknown gas/vapor emanating from specific points around the ...
22
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3answers
8k views

Why did the Saturn V stage fairing appear to burn after separation?

This video shows the stage separation of the 1st stage of Apollo 4 (incorrectly identified as Apollo 11) followed by the jettisoning of the ring-shaped fairing between the two stages. The moment the ...
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2answers
220 views

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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1answer
241 views

Why isn't the Falcon 9 first stage severely damaged by the blast of the second stage following separation?

When the Falcon 9 experiences stage separation, why isn't the first stage severely damaged by the blast of the second stage? When separation occurs, there seems to be some mechanical force to push ...
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2answers
185 views

What is the maximum practical deltaV obtainable from a chemical rocket launched from earths surface?

What is the maximum practical deltaV obtainable from a chemical rocket launched from earths surface? Not an exact number as there are too many variables but an approximate maximum assuming a 10,000kg,...
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1answer
104 views

Who or what performs the throttle up?

During a Falcon 9 launch you hear the commands 'throttle up' and 'throttle down'. Who or what performs 'throttle up' and 'throttle down' (i.e. astronaut or computer)?
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7answers
68k views

Did the space shuttle fly straight “up” when leaving Earth?

I was watching space shuttle launch recently, and at 2:53 you can see the space shuttle from an angle, even though it's high above the earth and you should see only the bottom. Did the space shuttle ...
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3answers
179 views

Was there a rocket launched to space with Japanese manga characters painted on it?

In How common is it to dedicate rocket launches to popular causes? I mentioned a launch for which I could not remember the details. I'd seen photos of a rocket, Japanese I believe, that would be ...
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2answers
4k views

Why do pressure fed engines have combustion instabilities?

Reading about the Sea Dragon idea, I came upon this argument against it, which sounds compelling, but relies on more detailed knowledge than I have: Those are to be pressure-fed to avoid "...
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1answer
1k views

Why would sub-cooled LOX tanks need to “topped-off” until the last minute or so?

Here is my understanding, let me know if I've got it right or wrong: Until recently, most cryogenic propellants were at or close to their boiling points. Each unit of heat leaking into the tank would ...
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2answers
465 views

What kind of payload is Mission 1390 (Zuma) going to launch?

Usually, when there is a "classified" payload, there are hints as to what it would be. Why is it different on this mission? Why is no government entity taking credit for it?
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3answers
4k views

Falcon 9 launch process - perception of launch speed

One of the things that drew attention from my local group of rocket-watchers with the Falcon 9/Crew Dragon launch is the perceived speed of the actual launch process. We have been conditioned for ...
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2answers
1k views

NASA cost estimating and Falcon 9

I have found this interesting report Commercial Market Assessment for Crew and Cargo Systems Pursuant to Section 403 of the NASA Authorization Act of 2010 (P.L. 111-267), published in April 2011. In ...
39
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1answer
8k views

Why did the Tesla Roadster spend time in the Van Allen belt?

Following the Falcon Heavy launch, the second stage + Roadster payload spent a number of hours 'drifting' through the Van Allen belt before performing the burn to put it into its current orbit. Elon ...
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2answers
2k views

How much liquid oxygen is lost during a Space-X Crew Dragon launch abort?

The tanks of the Space-X rocket should be emptied after a launch abort. I assume the liquid oxygen is pumped back to the storage tanks at the launch pad. But how much oxygen is lost by evaporation? ...
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2answers
775 views

Launchpad platform structural design

I am a civil engineer and would like to do a study on the design and construction of launching platforms for large lift vehicles, one example of which is the ELA 3 (Ariane Launch Area 3) in French ...
19
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1answer
711 views

What is done between a scrub and the next launch attempt?

What operations are performed that are not overlapping with 'scrub and take it off the launchpad back to VAB, there's a fatal fault' and 'launch successfully'? In particular, what (besides orbital ...
4
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1answer
152 views

What are the safety differences in launch conditions with Crew Dragon vs a normal launch?

During the scrubbed launch yesterday, one of the commentators mentioned there were more restrictions on crewed launches vs a launch of a satellite or Cargo Dragon. Is there a list of differences?
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0answers
72 views

Would the Saturday May 30th 2020 SpaceX launch visible from Boca Raton? [duplicate]

Will I be able to see the SpaceX Crew Demo-2 launch this Saturday May 30th if I’m at the beach in Boca Raton, Florida and the launch takes place?
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55 views

Real-Time Launch Statistics for the Demo-2 Mission

Is it possible to view the statistics such as pounds thrust and pressure of the Dragon Spacecraft's engines in real time. I'm not sure if Space-X or NASA has a part of their website dedicated to this, ...
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0answers
96 views

How Much Time Did We Have to “Duck and Cover” From an ICBM Launch Only 666 Miles Away? [closed]

During the Cuban Missile crisis I was stationed at Fort Wainwright, Alaska. As it had on many other occasions during the "cold war," our battle group began those infamous, "13 Days" by going on alert. ...
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40 views

How common is it to dedicate rocket launches to popular causes?

The BBC's Space Plane: Mysterious US military aircraft launches says: The launch was dedicated to front line workers and those affected by the pandemic. A message including the words "America ...
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4answers
6k views

Does launching rockets produce a sonic boom?

I've been watching rocket launches, and the commentator often remarks when the vehicle has gone supersonic. There is presumably a sonic boom at this point, right? Is it just that we don't hear it on ...
6
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3answers
1k views

Capacity of the BFR tanker — how many flights to fully refuel the spaceship?

So, the current plan for the BFR has the spaceship massing 85 tons and carrying 50 tons of cargo plus around 1000 tons of fuel and oxidiser (according to wikipedia), most of which is presumably ...
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0answers
75 views

Why were hot-stick downmoding to CSS, and the ability to use CSS for some control axes but not others, disabled during space-shuttle powered flight?

During ascent, if need be, a space shuttle’s flight controls could be switched from the normal, automatic control mode over to manual1 control (known as control-stick steering, or CSS), allowing the ...
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1answer
2k views

Did any of the Space Shuttle RCS covers ever stay on?

This dashcam video of the STS-133 launch shows some sort of plastic bag looking objects that blow off the nose of the shuttle in the first few seconds after liftoff. This answer says they are the RCS ...
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3answers
4k views

Have any satellites been lost or damaged on their way to the launch site (ground/sea transport)?

On our sister site Travel Stack Exchange, someone asked about carrying a cubesat on a plane in hand luggage and is worried about damage or loss (or not being allowed on the plane). Several answers ...
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1answer
3k views

Does any first-person video of a rocket launch exist?

I'm trying to find a good depiction of what it looks like to pass out of the atmosphere and watch blue skies transition to a starfield. What would be ideal is video looking out the window of a manned ...
6
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1answer
632 views

Would any manned orbital launches to date have been possible (but lower) if they were launched retrograde instead of prograde?

Manned launches have always been launched prograde to take advantage of the Earth's rotation velocity boost, and often in order to match the prograde orbit of another spacecraft for rendez-vous. I ...
4
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1answer
734 views

Are we changing Earth's rotation?

Can rockets launching change Earth's rotation, and can going into orbit do the same?
4
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1answer
170 views

Are rocket tanks being filled up until the last seconds before liftoff?

In rocket launch videos, we often observe liquid propellant rocket engines running at full thrust for several seconds before actual liftoff. We understand that liquid propellant rockets consume a ...
0
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1answer
106 views

News of eXCITe with QIKcom-2 and SeeMe, have they been launched, or is there currently one scheduled?

Comments under the question What ever happened to SHERPA? about NovaWurks, Inc. led me to search for the DARPA eXCITe microsatellite. Spaceflight 101's page includes: Th(e) objectives of the ...

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