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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1answer
76 views

How close to the launch site at Kennedy Space Center does a press badge allow?

How much closer than Bananna Creek Viewing Area can a press badge get me to the launch site at Kennedy space center? Or any other way to get closer?
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Was an onboard camera during a rocket launch ever pointing to the side rather than down?

I think all onboard cameras I ever watched were pointing down, towards the engine, during the ascent of the rocket. Do you know of any rocket that had a camera pointing to the side (towards the ...
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Why are the four launch opportunities within each Inspiration4 launch window "about an hour apart"?

In the SpaceX Inspiration4 Launch broadcast at about T-01:31:05 (91 minutes before launch) the process for selection of launch windows for the mission is roughly ...
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How old is the use of "L minus" to denote the number of days before launch?

In the SpaceX Inspiration4 Launch broadcast at about T-01:31:05 (91 minutes before launch) the term "L minus five" is used. While "T-minus" is a ...
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Would it be possible for a Falcon 9 booster stage to land after an in-flight launch failure?

We all know that the Falcon 9 is designed for reusability, but there still have been some hull losses. Though this hasn't happened yet, say a Falcon 9 experiences an in-flight failure where four core ...
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When did the Astra Space test flight 006 actually reach max-Q? There is substantial disagreement in the audio feed of the launch (Launch Vehicle 0006)

Watching the NASA Spaceflight video Astra Test Flight (Launch Vehicle 0006) linked below it seems the launch was terminated, but at least on the video there was no audible Earth-shattering kaboom. ...
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Roughly how high does a rocket have to get before the self-destruct becomes inaudible? Invisible?

Watching the NASA Spaceflight video Astra Test Flight (Launch Vehicle 0006) linked below it seems the launch was terminated, but at least on the video there was no audible Earth-shattering kaboom. ...
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Trussed strongback or hollow shell strongback?

I noticed that rocket Lab has a hollow rectangular section strongback made of steel, while few strongbacks like that of Astra [similar size] has a trussed structure for a strongback. is there any ...
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Why do recent launch vehicles like that of Space X and Rocket Lab have far fewer umbilicals than before? What has changed?

Launch vehicles using mobile launch pads have many umbilical connections, whereas the ones using TEL launch structure with strongback, don't. Why is that? As seen in the picture, Electron has just one ...
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Are cherry-pickers a new thing in spaceflight?

NASA Spaceflight's Chang Zheng-4B launches with two Tianhui 2 satellites links to the following @Cosmic_Penguin tweet It turns out to be...something else, an LM-4B successfully launching the 2nd pair ...
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Largest number of rockets launched into space from a given launch site in a 24 hour period?

Question: What is the largest number of rockets launched into space from a given launch site in a 24 hour period? Where, when, why? "into space" means $\ge$ 100 km, but pretty close to 100 ...
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What happened to the launch debris that the US dropped on Cuba? Was it noticed or reported?

This answer to How does one dogleg from Florida to a sun-synchronous orbit? this answer to History of multiple-payload launches? both describe a launch of GRAB1 that secretly contained a second ...
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Most dog-legged launch?

There are enough questions about dogleg maneuvers that there is now a tag, but the definitive dogleg answer is @JakeBlockers (linked below) which includes images of a dogleg from Florida that avoids ...
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How do vibrational isolators reduce the g-forces of a payload on a launch vehicle?

Launch vehicles often use vibrational isolators to reduce g-forces to protect delicate payloads. How are g-forces reduced on the payload while both the payload and the launch vehicle maintain the same ...
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If money weren't an issue, what's the best way to get maximum mass to LEO in 1 year? 5 years? 10? [closed]

I can kick this over to World Building if it's more appropriate, but I was hoping to get an actual technical examination of this. So here's the question: if money were not an issue and for some reason ...
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1answer
488 views

Does MAX Q during rocket launch only say that rocket experiences max dynamic pressure? [duplicate]

I know that during rocket launch, one main event that occurs is MAX Q where the rocket experiences maximum dynamic pressure which is simply (1/2)ρv^2. I also know that drag coefficient of rocket ...
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Could a Falcon 9 reach orbit with a person glued to the outside of it?

Apologies for asking a dumb question, but I'm going to ask it anyway... I was watching a music video where the singer duct-tapes her ex to the side of a rocket to exile him into space, and it made me ...
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Is or was STARGATE really being used for SpaceX launches at Boca Chica or otherwise?

The 2015 answer to For SpaceX's Texas launch site, what kind of range radar/tracking will they have? links to The Spacecraft Tracking and Astronomical Research into Giga-hertz Astrophysical Transient ...
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3answers
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Does Virgin Galactic experience real weightlessness?

Does Virgin Galatic go into space high enough to experience real weightlessness? A CNBC article states it's more microgravity centrifugal: The spacecraft essentially does a slow back flip at the edge ...
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Just how "unreasonably gigantic" was the exclusion zone for the scrubbed SpaceX's Transporter-2 Mission first attempt?

Watching Transporter-2 Mission, currently after 15:02 in the video (after an extended hold at T-00:00:11) I heard a voice say: ...
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Do space transportation firms such as SpaceX receive a financial compensation if a launch is cancelled because of an airplane entering the launch zone

I read on https://arstechnica.com/science/2021/06/spacex-to-launch-second-rideshare-pressuring-small-launch-industry/ (mirror 1, mirror 2): The countdown clock got to T-11 seconds on Tuesday ...
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Was there any launch vehicle possible that could have been used for a heavier New Horizons with enough fuel to enter Pluto orbit? (adding ~10 years)

Answers to the Astronomy SE question Can New Horizons probe turn back and start orbiting Pluto are of course no, it would have to have been a different mission with a lot more fuel and a bigger launch ...
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Which Launching State HASN'T breached its obligations under the 1976 Registration Convention?

(the wording of my question above is voluntarily provocative, but the actual question below may be even more) The context: The 1976 Registration Convention is part of a set of Treaties that ...
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Does Article VI of the Outer Space Treaty apply to a Launching State?

The following question was asked and answered 3 years ago: might ISRO’s launch of Swarm’s satellites in 2018 be at least a technical violation of the Outer Space Treaty? Recall that the launch in ...
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Measurement and estimation of temperature of Space Shuttle nose cone during launch and re-entry

During the launch and re-entry of the Space Shuttle, what are the measured and estimated temperatures (or distribution) of the shuttle nose cone as a function of altitude? How is the temperature ...
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What are the advantages of building a rocket base on the moon (if there are any)? [duplicate]

Gravity is 1/6 on the moon (as compared to Earth). So to launch a rocket there will take considerably less fuel. On top of that, the moon circles around the Earth so you could give the rocket all ...
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If Country A's rocket hits an incorrectly declared satellite of Country B, which institution can arbitrate the dispute? Under which international law?

The related recent question Which institution regulates rocket launches of all countries? was closed as it is considered as already answered 7 years ago. I would like to submit the following scenario ...
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Which institution regulates rocket launches of all countries? [duplicate]

Which institution regulates the rocket launches of all countries? Meaning, suppose a country wants to launch a rocket, where do they have to report it before the actual launch and how far ahead? ...
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1answer
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What is an "Aceteria improved Ryan suborbital sounding rocket"?

Why does the Minotaur I wear a yellow jacket that "banana-peels" off as it launches? links to the NASA Wallops video NRO L-111 Launch (already cued at the statement in question). At the end ...
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Why did the space shuttle's altitude go down after reaching 108,000m?

I recently took a look at this little data sheet by NASA: Math and Science @ Work; Space Shuttle Ascent Time Altitude Velocity Acceleration Comment (s) (m) (m/s) (m/s^2) 20 1244 139 18.62 40 5377 ...
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Why does the Minotaur I wear a yellow jacket that "banana-peels" off as it launches?

Videos available of the recent Minotaur I launch at Wallops for NROL-111 show a yellow jacket on most of the four stage SRB-to-orbit launch vehicle. I read or heard somewhere that wires attached to ...
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1answer
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Need of the DoD for a heavy lift vehicle for "other" satellites

As mentioned in Saturn I history, the DoD wanted a launch vehicle to put A): 20,000 to 40,000 pounds (~9,100 to ~18,200 kg) into orbit, or B): accelerating 13,200 to 26,200 pounds (6,000 to 11,900 kg) ...
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Identifying attitude control mode in GNC software?

Launch vehicles will generally have multiple multiple attitude control modes. At launch, the engine-gimballing thrust-vectoring system is in charge. In orbit, the reaction control system is (at least ...
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1answer
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Exact condition for hold-down release?

I've read the space-shuttle hold-down clamps would be released once all engines registered 90% of nominal thrust. But would this be sufficient condition to open the hold-down clamps and release the ...
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79 views

How many decimal places in GNC numbers?

My launch simulation's producing numbers on the order of 1e-12 and sometimes smaller. I can't imagine that any sensor would be so precise and therefore that 10+ decimal places would be meaningful or ...
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1k views

What controls hold-down clamp release: rocket... or ground control?

Curious where the signal to detonate the pyro bolts and release the hold-down clamps comes from... The rocket about to lift off? Or ground control?
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Space shuttle digital signal processor (DSP): floating point or fixed point?

Digital signal processors can represent irrational numbers using fixed-point or floating-point data types. Fixed point means fixed number of decimal places, and floating point means floating number of ...
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1answer
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How is altitude measured in self-landing rocket stages?

Altitude must be a key metric for a self-landing rocket stage on landing approach. But where exactly does that measurement come from? And to what decimal place would it be accurate? I'm sure the ...
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1answer
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Switching logic between throttle modes?

At launch, a vehicle like the space shuttle would command its throttle to do a few things: Ramp up to max throttle Hold max throttle Follow a throttle bucket as function of velocity when near max-Q ...
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298 views

What do hold-down clamps... clamp exactly?

Dummy question. A launch vehicle is restrained during ignition by hold-down clamps. But exactly what part of the rocket do the clamps grab onto? The engine nozzles seem too fragile... but maybe some ...
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266 views

Most noodle-like (highest aspect ratio) orbital launch vehicle ever?

Just how much can tall skinny rockets bend? (roughly, safely) Why is Falcon 9's shape so tall and skinny? If not constrained by underpasses, etc., would Falcon 9 have been less of a flying noodle? ...
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Which crewed spacecraft provides the gentlest ascent?

The Space Shuttle is considered to be the spacecraft with the gentlest decent and landing. I was surprised to learn that its ascent was quite a rough experience. So I was wondering: Which orbital ...
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857 views

Is there a record for unbroken series of "successful launches" by some objective criteria? Who has it now? What has to happen for it to change hands?

From the (I'd say) historic and pivotal hearing Wednesday, March 5, 2014 Defense Subcommittee (Chairman Durbin) Time and Location: 10:00 a.m., in Room SD-192 of the Dirksen Senate Office Building ...
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Tracking stations that could have been used in 1967 & 1971 for the launches of the WRESAT & Prospero, X3 satellites from Australia

In relation to the question, How many satellites were orbited from Australia in total? In November 1967 and October 1971 the WRESAT and Prospero, X3 satellites were launched from Woomera, South ...
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How many satellites were orbited from Australia in total?

WRESAT; The first Australian Satellite Launched Wednesday November 29, 1967 on Colin Mackellar's Honeysuckle Creek website links to several other pages with various details and photos of the mission. ...
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Jimsphere example data for wind speed/direction vs altitude?

I've added load relief to my thrust-vector controller (TVC) and would like to simulate it with some realistic wind data, ideally up to 80 km or higher. I know wind speed and direction would be ...
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Alternative small mass payload transportation from the moon to L5 besides rail gun and mass driver?

This question asks about a low cost transportation from the lunar surface to a space settlement at L5. Moon mining is can be a revolutionary breakthrough in sustaining a space economy, but large scale ...
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1answer
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Why were Bion 6, Bion 7 and Bion 9 launched at the times they were? Was it related to thermal management for their living cargo?

An answer to Have any living organisms been intentionally launched into polar orbits? says (in its entirety currently): Yes. The highest inclination orbit with animals I could find are Bion 6, Bion 7 ...
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Launch escape trajectory

Say a fault triggers the launch escape system and the crew vehicle fires away. What trajectory would the LES controller follow? Keep minimal angle of attack to minimize aerodynamic loads (e.g., in ...
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Have any living organisms been intentionally launched into polar orbits?

The Space Shuttle was originally intended to be able to support polar orbits, by launching from Vandenberg AFB, in California. Although a launch complex was built, it was never used for a Shuttle ...

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