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.

92 questions with no upvoted or accepted answers
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13
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314 views

How did “the kid” (John Meisenheimer) calculate that there was a wave in the jet stream and Explorer 1 would be okay to launch?

The tough but timely question NASA at sIxty years, will there be a new moonshot mandate? links to the NASA YouTube video NASA 60th: How It All Began which shows a lot of really nice, historical file ...
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Which launch was the first to use a dogleg maneuver?

Jake Blocker's excellent answer explains what a dogleg maneuver is, what it's for, what it looks like, and even what a real dog's leg looks like for comparison! A dogleg maneuver is done to change ...
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148 views

What rocket uses the largest percentage of Fuel/Oxidizer before liftoff?

inspired by this question: How much propellant is used up until liftoff? which asks how much propellant (fuel/oxidizer) a typical rocket uses before liftoff. What has been or is the most non-typical ...
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Are the ejected first stage Electron rocket batteries really incinerated?

This answer reminded me that the Electron rocket drops one of it's batteries when it is mostly spent. We might call that "micro-staging". This answer quotes Spaceflight 101: With a low auto-...
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For a launch, how is safe viewing distance determined?

In determining safe viewing distance, seems to me there are discrete threats to consider: First is the rocket blowing up on the pad, or just above it. That would have no warning. There would be a ...
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142 views

What would a human rocket be like to launch a human off Mimas?

In a comment on Is there a self-rounding celestial body from which an Olympian could jump into space? @jpa made a modest proposal. What if we stacked a bunch of athletes on top of each other and ...
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Are “launch-on-minute” or other discrete launch times protocols currently the norm for wide launch windows?

This excellent answer to a question about collision avoidance practices for launches begins with: While the length of a launch window varies, launches within the window typically occur at discrete ...
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5k views

How far does the sound of a rocket launch carry?

Having never been to a rocket launch, can you tell me how far the sound carries? I can hear the rumble of F-15 Eagles take off from inside my office building five miles from the airport. An F-15C is ...
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484 views

What would be the range safety for vertically landing over land rockets?

sideFrom the Wikipedia article on range safety: Rockets are usually launched into a space above the launch range called the launch corridor. If rocket engines fail while the rocket flies inside ...
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49 views

Falcon 9 plot of pitch angle vs time during launch?

I found this super helpful plot of the Saturn V pitch angle vs time during launch: Is there an equivalent plot for a typical (or atypical if must be) Falcon 9 launch?
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Does the low gravity on Moon eliminate the need for a launch pad/flame trench for a reusable rocket launch?

I'm new to rocket science and I learned how the rockets do not reach full thrust immediately and isn't really stable for the initial couple of seconds - hence the need for "launch clamps" and a ...
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121 views

How much did it cost to refurbish the Launch Complex 39 hardware after an Apollo Saturn V launch?

A launch pad used for a rocket of some 30-35 MNewtons of thrust does not come out of it unscathed. It must be refurbished before it can be used again. How much does that cost? As an indication of such ...
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503 views

How long does it take to chill the LOX and RP1 for Falcon 9 V1.1 Full Thrust?

The new version of the Falcon 9 v1.1 Full Thrust, or as SpaceX would like everyone to start calling it "Falcon 9", uses super cooled LOX and RP1 to improve the density of the fuel for better ...
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1answer
417 views

How does the flight trajectory of a GEO vs LEO mission vary for a Falcon 9 first stage?

How does the trajectory vary between the two types of missions? Specifically, how does the speed and velocity vary for the booster for a Falcon 9 mission?
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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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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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53 views

Which nations own tracking ships for support of rocket launches?

This wikipedia list of tracking ships contains ships of the following nations: China, France, Russia and USA. Are there no other missile range instrumentation ships for support of space operations of ...
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212 views

Was it another Fishing Tournament?

@KimHolder's thorough answer to the question What are the consequences for a person who violates a launch exclusion zone? mentioned a fishing tournament. @PearsonArtPhoto's comment about scheduling ...
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79 views

Commentary-free launch video?

Does NASA broadcast live video of their launches (specifically from Kennedy) that does not feature commentary? I appreciate Mike Curie's comments but... sometimes I just want to hear the controllers ...
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208 views

Were composite materials used on Soyuz and on Atlas launchers?

I would like to know if composite materials were used on Soyuz and Atlas launchers but I can't find a lot on the web. I also would like to know which components of other launchers are made of ...
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341 views

Shortest and longest times a real rocket got into LEO from liftoff?

I'm looking for the record shortest and longest times a real rocket took to get its payload into LEO, such that it didn't need any additional delta-v to stay in orbit, starting from launch at the ...
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73 views

Does space weather affect spacecraft launch schedules?

Does space weather affect spacecraft launches and do scientists check it before spacecraft go to space? I know there is space turbulence and it can influence a spacecraft, but can space weather?
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59 views

How soon after launch is pitchover done?

I'm reading conflicting things on the timing of the pitchover. When exactly does it start? Many people write that it's almost immediately after launch, as soon as it's practical. Once the rocket ...
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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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During ascent, can SPACE-X ever be seen from Long Island, NY?

At night I have seen Space Shuttles' engine exhaust from Long Island NY, in the southeast sky 7 minutes after liftoff from the Cape. Does Space-X ever launch in a direction that it can be seen from ...
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Does the FAA have anything to do with landing on the Moon specifically?

The Motley Fool's Space Investors, Rejoice! There May Be Something Worth Mining on the Moon begins with: It's been four years now since Bigelow Aerospace filed its application with the Federal ...
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251 views

What were Hubble's jerk and jounce limits? Did JWST have the same?

From Wikipedia: In physics, jerk is the rate of change of acceleration; that is, the derivative of acceleration with respect to time, and as such the second derivative of velocity, or the third ...
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Differential Equations for Rocket Launch in Polar Coordinates

I'm trying to understand the equations of motion for a rocket launched from earth, through the atmosphere, and into LEO. I found a set of ordinary differential equations which describe the motion of ...
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How is the process of launching a rocket mathematically modeled up front?

What I am looking for is an example where real persons in the real world really need to mathematically model a situation before they need to calculate the average and instantaneous rate of change. I ...
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1answer
259 views

Has a rocket from a torpedo tube ever reached space?

Are submarine launches horizontal? is a general question and specifies by name two large ICBMs which are likely to need to be launched vertically. Since the large naval submarines usually come ready-...
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79 views

Saturn V launch footage from in/on first S-IC stages

There first launches of each Saturn-class rocket were instrumented with, among other sensors, video cameras to learn about the vehicles’ behavior. The cameras were jettisoned at some point and then ...
3
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1answer
108 views

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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Cubesat/Nanosat dispensers/deployers costs

I’ m looking for informations about dispensers/deployers equipement costs and associated launch costs, espacially for 12U configurations and over. I’ve got price information on Tyvak 12U Deployer in a ...
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232 views

Cost of launch unrelated to cost of building rocket

ULA CEO Tory Bruno said long time ago that only 1/2 cost of orbital launch is cost of building of rocket. SpaceX never denied this. F9R block 5 total cost of launch can be about 60-80 million per ...
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When does the space shuttle stop its gravity turn?

I am trying to model the launch of the space shuttle (up to 120km of altitude) from Cape Canaveral, Florida. In order to do so I would need to know when the gravity turn part of the flight starts and ...
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211 views

How much noise would the BFR make at launch?

In addition to multi-planetary travel, SpaceX has plans to use the BFR for intercontinental travel. However, would the sound generated by the BFR's launch disrupt local communities and therefore make ...
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170 views

Does a safety team get fined if a rocket launch fails due to the safety of the rocket?

I was writing a story and I wanted to write about this topic but I could not find a straight answer from any website. Please help
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384 views

Launch windows for on-orbit rendezvous

Suppose you've got a spacecraft in an orbit similar to that of ISS (let's say 51.6 degrees, but about 19 km lower). Suppose also you want to launch a second spacecraft to rendezvous with the first, ...
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251 views

What is the total mass of everything launched that are still in space?

Inspired by this question, total mass ever launched to orbit (this is a different question, as many of the things launched have decayed by now.) How much of it is still up there? Out of that again, ...
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170 views

Could it be possible to “steam” up water to orbit and collect it there?

Water is cheap and useful for many purposes in space (fuel, life support, radiation shielding and maybe even as the bulk part of construction material if covered from sublimation in vacuum). But ...
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183 views

How does ULA propose to get “350% more lift” out of the Vulcan design?

I listened to the annoucement of the Vulcan NGLS booster from ULA. The graphics released and show at SpaceFlightNow.com show a line. "350% more lift" but I could not figure out where that is coming ...
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71 views

What sectors spend how much on space launches?

How is the money which is spent on space flight, in terms of launch costs, distributed between different purposes? I suppose that it would be unwieldy to consider the money spent on the development ...
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Falcon 9 Stage-1 Reentry Burn: Throttle Setting, Duration?

How long does stage 1 of Falcon 9 fire its engines during its reentry burn, and what throttle setting do they use? Also, is it known how much fuel is left at MECO? Thanks if you know and can share!
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Antares yaw maneuver: how many degrees?

The Antares rocket begins launch with a very noticeable yaw maneuver that seems to rotate it more than the 1.25 degrees documented for the Saturn V. Am I being misled by perspective? Does anyone know ...
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49 views

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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53 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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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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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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71 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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Will SpaceX use a special launch maneuver for the SAOCOM 1B mission?

Teslarati's SpaceX sets date for first Florida launch of its kind in more than half a century explains that something different will happen. For those that want to read the article first, I've used ...